Apple LaserWriter II NT: Difference between revisions

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{{Infobox computer peripheral

| name = Apple LaserWriter ~~IINT~~

| name = Apple LaserWriter II NT

| image = [[File:~~Apple_LaserWriter_IINT~~.jpg|~~250px~~]]

| image = [[File:Apple LaserWriter II (All About Apple museum).jpg|260px|frameless]]

| caption = Apple LaserWriter ~~IINT~~ (~~1988~~)

| caption = Apple LaserWriter II (the NT, SC and NTX share this case)

| manufacturer = Apple Computer, Inc.

| type = Laser printer

~~| release date = January 1988~~

| interface = LocalTalk / RS-422 (mini DIN-8); RS-232 (DB-25); Apple Desktop Bus connector present

~~| discontinued = October 1, 1991~~

| compatible = Macintosh; other computers over RS-232

~~| price = US$4,599 (1988 retail)~~

| dimensions = 8.6 in high × 20 in wide × 18.5 in deep

| interface = LocalTalk, RS-232~~/RS~~-~~422 serial, ADB~~

| weight = 45 lb (20.25 kg)

| compatible = Macintosh~~, Apple II, PC (via~~ RS-232)

| power = 90-126 V AC, 50-60 Hz

| dimensions = 8.~~7" H ×~~ 20~~.2" W ×~~ 18.~~7" D~~

| part_number = 661-0438 (NT controller-I/O board)

| weight = 45 ~~lbs~~ (20.4 kg)

| power = ~~900W maximum,~~ 90-~~126V/~~50-~~60Hz~~

| ~~model~~ = ~~M6000~~

}}

The '''Apple LaserWriter II NT''' is the PostScript member of the LaserWriter II range. It shares the Canon LBP-SX engine, the case, the power supply and the mechanical parts with the [[Apple LaserWriter II SC|II SC]] and the NTX. Its controller-I/O board has a 68000 at 11.16 MHz, 1.0 MB of ROM and 2.0 MB of RAM, and runs PostScript and Diablo 630 emulation over LocalTalk, RS-232 and RS-422.<ref name="asg">''Apple Service Guide for LaserWriter Printers, Volume I'', Apple Computer, Inc., January 1992 (072-0631-B), hosted on this wiki as [[Apple LaserWriter Printers Volume I]] ([[:File:Apple LaserWriter Printers Volume I.pdf|PDF]]). Covers the LaserWriter, LaserWriter Plus, LaserWriter II SC/NT/NTX/IIf/IIg and Personal LaserWriter SC/NT/LS. Introductory safety section: the high-voltage, optical-fibre, fuser-cooling, ESD, not-being-grounded and lifting warnings; the LaserWriter Safety Rules; the toner-safety paragraph; the laser-safety paragraph and the three laser warning labels. Tab 3, LaserWriter II: parts list including the NT controller-I/O board and its ROM set (pages 4-5); controller-I/O board specifications (page 10); print engine specifications (page 11); status LEDs (page 12); test pages (page 13); the pre-power-on checklist, the troubleshooting flowcharts and tables including the NT low-toner note (pages 14-54); the laser power output check (page 55); and preventive maintenance including the page count, the parts replacement schedule and the user and standard maintenance tables (pages 59-60). Tab 6, Ports and Cables: the peripheral cable table, external connector diagrams, the RS-422 and RS-232 pin-outs and the LaserWriter II NT switch configuration table.</ref> Read the [[#Safety|Safety]] section before taking the covers off: the printer contains an invisible laser, a fuser that needs five minutes to cool, and a high-voltage supply for the coronas.

~~The~~ '''~~Apple~~ LaserWriter ~~IINT~~''' ~~was a midrange laser printer in the LaserWriter II series, released in January 1988 at US$4,599. The IINT positioned between the budget IISC and high~~-~~end IINTX models, offering full PostScript Level 1 support and LocalTalk networking~~. ~~The printer featured a Motorola~~ 68000 ~~processor running at~~ 11.5 MHz ~~with~~ 2 MB ~~of fixed~~ RAM ~~and~~ 1 MB ~~ROM containing 35 built~~-~~in fonts. Using the Canon LBP~~-~~SX print engine shared across the LaserWriter II line~~, ~~the IINT delivered 300 dpi resolution at 8 pages per minute. Performance improvements over earlier models came from elimination of memory wait states~~, ~~providing faster~~ PostScript ~~rasterization. The IINT was discontinued~~ in ~~October 1991~~, ~~replaced by the LaserWriter IIf.~~

== Controller-I/O board ==

{| class="wikitable styled-table" style="width:95%;"

|+'''Controller-I/O board specifications, LaserWriter II range'''

! !! SC !! NT !! NTX !! IIf !! IIg

|-

| CPU || 68000 (7.45 MHz) || 68000 (11.16 MHz) || 68020 (16.67 MHz) || 68030 (20.0 MHz) || 68030 (25.0 MHz)

|-

| ROM || 16 KB || 1.0 MB || 1.0 MB || 2.0 MB || 2.0 MB

|-

| RAM || 1.0 MB || 2.0 MB || 2.0 MB, expandable to 12 MB || 2.0 MB, expandable to 32 MB || 5.0 MB, expandable to 32 MB

|-

| I/O || SCSI || LocalTalk, RS-232, RS-422 || LocalTalk, RS-232, RS-422, SCSI || LocalTalk, RS-232, RS-422, SCSI || LocalTalk, RS-232, RS-422, SCSI, Ethernet

|-

| Imaging languages || QuickDraw || PostScript, Diablo 630 || PostScript, Diablo 630, HP LaserJet || PostScript Level 1 and 2, HP LaserJet IIP || PostScript Level 1 and 2, HP LaserJet IIP

|-

| Built-in fonts || Times, Helvetica, Courier, Symbol || Times, Courier, Symbol, Palatino, Helvetica, Helvetica Narrow, ITC Bookman, ITC Avant Garde, ITC Zapf Chancery, New Century Schoolbook, ITC Zapf Dingbats || As NT || As NT || As NT

|}

=~~= Technical Specifications ==~~

Apple's guide gives memory upgrade procedures for the NTX and the IIf/IIg, and none for the NT, whose 2.0 MB is fixed.<ref name="asg" />

=== ~~Physical Specifications~~ ===

=== Board layout ===

* '~~''Dimensions:''' 8~~.~~7" H × 20~~.2" ~~W × 18.7~~" ~~D (221 × 513 × 475 mm)~~

Apple's service course diagram of the NT controller-I/O board shows an MC68000, a 6532, an 8530 SCC, 1 MB of ROM, 2 MB of RAM and SRAMs, with the Apple Desktop Bus connector, a two-position switch, the RS-232 port and the LocalTalk/RS-422 port along the back panel. The board connects to the print engine through a 32-pin right-angle connector that engages as the board slides into its guide rails.<ref name="train">''Apple Service Training: LaserWriter II Service Course, Participant Manual, Version 1.1'', Apple Computer, Inc., October 1992, hosted on this wiki as [[Apple Laserwriter Ii Service Training Participant Manual Version 1.1 Oct 1992|LaserWriter II Service Course: Participant Manual]] ([[:File:Apple LaserWriter II Service Training Participant Manual Version 1.1 Oct 1992.pdf|PDF]]). Module 1, "LaserWriter II Parts and Functions": the SC, NT and NTX I/O board block diagrams and back panels (figures 1-3 to 1-5) and the 32-pin right-angle engine connector; the four-subsystem breakdown (power distribution, control, image formation, pickup/feed); the power distribution diagram (figure 1-7); the DC controller PCB's role; the interlock switch at the top of the DC power supply; the status panel description; the distribution PCA (figure 1-12) with drum-sensitivity switches SW301 and SW302, pickup solenoid SL301, registration clutch solenoid SL302, paper-out sensor PS301 and manual feed sensor PS302; and paper delivery sensor PS331 on the fuser PCA.</ref>

* '''~~Weight~~:''~~' 45 lbs~~ (20.~~4 kg~~)

* '''Operating temperature:~~''' 50°F~~ to ~~90°F~~ (~~10°C to 32°C~~)

* '~~''Humidity:''' 20% to 80% non~~-~~condensing~~

* '''Acoustic noise:''' 48 dBA operating

=== ~~Performance~~ ===

=== Board and ROM part numbers ===

* '''Print speed:~~''' 8 pages per minute~~

{| class="wikitable styled-table" style="width:70%;"

* '''~~Resolution:~~''' ~~300 × 300 dpi~~

|+'''NT controller-I/O board'''

* '''First page out:''' Approximately 30 seconds

! Part !! Number

* '''Engine life:''' 300,~~000 pages rated~~

|-

* '''Duty cycle:''' 3,~~000 pages per month recommended~~

| Controller-I/O board, LW II NT || 661-0438

|-

| IC, ROM, L0 || 342-0545

|-

| IC, ROM, H0 || 342-0546

|-

| IC, ROM, L1 || 342-0547

|-

| IC, ROM, H1 || 342-0548

|-

| IC, ROM, L2 || 342-0549

|-

| IC, ROM, H2 || 342-0550

|-

| IC, ROM, L3 || 342-0551

|-

| IC, ROM, H3 || 342-0552

|}

~~=== Power Requirements ===~~

The NT board carries eight ROMs in high and low pairs, L0/H0 to L3/H3. The NTX takes eight differently numbered ROMs (342-0560 to 342-0567, or 342-0711 to 342-0718 on the rev. 3 board), and the IIf and IIg take four (076-0860 to 076-0863).<ref name="asg" />

* '''Input voltage:''' 90-~~126V AC (auto~~-~~ranging)~~

* '''Frequency:''' 50-~~60 Hz~~

* '''Power consumption:''' 900W maximum

* '''Current draw:''' 7.~~5A maximum~~

* '''Heat output:''' 3,~~078 BTU per hour~~

== ~~System Architecture~~ ==

== Ports and switches ==

The rear panel carries, left to right, an Apple Desktop Bus connector, the switches, the RS-232 port and the LocalTalk/RS-422 port. The SC, NT and NTX have the ADB connector; the IIf and IIg do not, and use a pushbutton switch instead. Apple's guide shows the connector but describes no function for it.<ref name="asg" />

==~~= Processor~~ and ~~Memory =~~==

{| class="wikitable styled-table" style="width:70%;"

~~The LaserWriter IINT used an optimized 68000 configuration:~~

|+'''RS-422 / LocalTalk, mini DIN-8 (as on the NTX, IIf, IIg and Personal LaserWriter NT)'''

! Pin !! Signal !! Description

|-

| 1 || HSKo || Handshake out

|-

| 2 || HSKi || Handshake in

|-

| 3 || TxD− || Transmit data −

|-

| 4 || SG || Signal ground

|-

| 5 || RxD− || Receive data −

|-

| 6 || TxD+ || Transmit data +

|-

| 7 || GPi || General-purpose input

|-

| 8 || RxD+ || Receive data +

|}

~~'''Central Processing Unit~~:~~'''~~

{| class="wikitable styled-table" style="width:70%;"

* '''~~CPU:~~''' ~~Motorola MC68000~~

|+'''RS-232, DB-25'''

* '''Clock speed:''' 12 MHz crystal (operating at 11.5 ~~MHz)~~

! Pin !! Signal !! Description

* '''Data ~~bus:''' 16~~-~~bit~~

|-

* '''Address bus:''' 24-~~bit (16 MB addressable)~~

| 1 || SGND || Signal ground

* '''Wait states:''' None (improved from LaserWriter Plus)

|-

| 2 || TxD || Transmitted data

|-

| 3 || RxD || Received data

|-

| 4 || RTS || Request to send

|-

| 5 || CTS || Clear to send

|-

| 6 || DSR || Data set ready

|-

| 7 || SG || Signal ground

|-

| 8 || DCD || Data carrier detect

|-

| 20 || DTR || Data terminal ready

|-

| 22 || RI || Ring indicator

|}

~~'''Memory Configuration:'''~~

=== Switch configurations ===

* '''ROM:''' 1 MB mask ROM

The NT has two switches:<ref name="asg" />

* '''RAM:''' 2 MB total (fixed, soldered to board)

* PostScript workspace and font cache

* Frame buffer for page rasterization

* '''RAM type:''' Fast DRAM (no wait states)

* '''Memory expansion:''' None possible

* '''Performance:~~''' Faster rasterization than LaserWriter Plus~~

=== ~~Controller Board Design ===~~

{| class="wikitable styled-table" style="width:70%;"

~~The IINT controller featured improved architecture:~~

|+'''LaserWriter II NT switch configurations'''

! Communication and command mode !! 1 !! 2

|-

| LocalTalk || Up || Up

|-

| Diablo 630 emulation || Down || Up

|-

| 9600 baud RS-232 and RS-422 || Up || Down

|-

| 1200 baud RS-232 and RS-422 || Down || Down

|}

* '''PostScript ~~interpreter:''' Level 1 implementation~~

The NTX has a six-switch bank with separate command-mode and handshaking groups, including a PostScript interactive mode and an HP LaserJet mode.<ref name="asg" />

* '''Font management:''' 35 fonts in ROM

* '''Graphics processing:''' Vector and ~~bitmap support~~

* '''Interface logic:''' PAL-based design

* '''Memory controller:''' Zero wait-state access

~~=== PostScript Implementation ===~~

Apple's cable for the NT is the LocalTalk Connector Kit, DIN-8, service part 590-0338 or 630-8275, model M2068, the same kit as for the NTX, IIf, IIg and Personal LaserWriter NT.<ref name="asg" />

'~~''PostScript Specifications:'''~~

* '''Version:''' PostScript Level 1

* '''Licensor:''' Adobe Systems

* '''Language features:''' Complete programming language

* '''Graphics:''' Vector graphics, ~~Bézier curves~~, ~~transformations~~

* '''Font handling:''' Type 1 and ~~Type 3 support~~

* '''Emulation:''' Diablo 630 mode available

'''~~Performance Improvements:~~'''

== Print engine ==

* Eliminated wait states from ~~LaserWriter Plus~~

{| class="wikitable styled-table" style="width:90%;"

* Faster font cache management

|+'''LaserWriter II print engine specifications'''

* Improved complex page handling

| Marking engine || Canon LBP-SX laser xerographic

* Reduced processing time for graphics

|-

| Print resolution || 300 dots per inch

|-

| Speed || 8 pages per minute

|-

| Print materials || Letter, legal, A4 and B5 in 16-20 lb single-sheet photocopy bond, 8-34 lb letterhead and coloured stock, or overhead transparency film. Envelopes, labels and paper up to 36 lb by manual feed; envelopes also from an optional envelope tray

|-

| Print capacities || Paper cassettes hold 200 sheets of 20 lb paper; the envelope cassette holds 15 envelopes

|-

| Printable surface || Letter 8.0 × 10.5 in; Legal 8.0 × 13.0 in; A4 7.41 × 10.86 in; B5 7.69 × 10.16 in

|-

| Physical dimensions || Height 8.6 in (21.8 cm); width 20 in (50.8 cm); depth 18.5 in (47 cm); weight 45 lb (20.25 kg)

|-

| Operating environment || 50 to 90 °F (10 to 32.5 °C); humidity 20% to 80%

|-

| Power requirements || 90 to 126 V AC; 50 to 60 Hz

|}

== ~~Print Engine~~ ==

=== The four subsystems ===

Apple's service course divides the engine into four subsystems:<ref name="train" />

* Power distribution: the AC inlet and power switch, the AC driver board and fuser heater, the DC power supply/motor driver PCA, the high-voltage power supply for the primary corona, transfer corona and developing bias, and the distribution PCA.

* Control: the DC controller PCB, which receives the print command from the controller-I/O board, controls the rest of the engine and reports status on the front-panel LEDs. The course tells technicians always to check the DC controller, because a module that seems faulty may not have received its command or its supply.

* Image formation: the laser diode, scanning motor and optical fibre, the photosensitive drum, the coronas, the static-charge eliminator, the toner sensor and the fuser.

* Pickup and feed: the cassette, the pickup and registration rollers, their solenoids and the paper sensors.

=== ~~Canon LBP-SX Engine~~ ===

=== Sensors, switches and solenoids ===

~~The IINT used~~ the ~~improved Canon LBP~~-~~SX engine:~~

{| class="wikitable styled-table" style="width:85%;"

|+'''Pickup/feed and control devices (service course)'''

! Designator !! Location !! Function

|-

| PS301 || Distribution PCA || Paper-out sensor; senses paper in the cassette

|-

| PS302 || Distribution PCA || Manual feed sensor; uses the same arm as PS301

|-

| PS331 || Fuser PCA or fuser assembly PCA || Paper delivery sensor. If paper fails to reach and clear it in time, a jam is reported

|-

| SL301 || Distribution PCA || Pickup roller solenoid; engages the clutch that turns the pickup roller

|-

| SL302 || Distribution PCA || Registration roller clutch solenoid

|-

| SW301, SW302 || Distribution PCA || Drum-sensitivity switches, set by the toner cartridge

|-

| Interlock switch || Top of the DC power supply || Cuts power when the upper unit opens

|}

~~'''Engine Specifications:'''~~

Because PS301 and PS302 share one arm, a bent or sticking arm can affect both the paper-out and the manual-feed indications.<ref name="train" />

* '''Technology:''' Laser xerography (electrophotographic)

* '''Photosensitive drum:''' Organic photoconductor (OPC)

* '''Laser type:''' Semiconductor laser diode

* '''Developer system:''' Single-~~component toner~~

* '''Fusing:''' Heat roller system

* '''Paper path:''' Straight-~~through design~~

~~'''Advantages over LBP~~-~~CX:'''~~

== Safety ==

* ~~32% weight reduction~~

The LaserWriter family safety rules apply:<ref name="asg" />

* ~~Improved reliability~~

* Switch off and disconnect the power cord before servicing. Parts are live under power; never work on the printer under power except when making live adjustments. With the covers off and the power on, do not touch the high-voltage power supply, the DC power supply or the power supply block.

* ~~Quieter operation~~

* Do not disconnect the optical fibre cable with the printer on. It carries the infrared laser beam, which cannot be seen and can permanently damage the eyes. Keep screwdrivers and other shiny objects out of the beam path; the reflection is equally dangerous. The warning labels inside the covers read "DANGER - INVISIBLE LASER RADIATION WHEN OPEN. AVOID DIRECT EXPOSURE TO BEAM."

* ~~Better paper handling~~

* The fuser rollers become very hot. Switch off for at least five minutes before servicing them.

* ~~Longer component life~~

* Do not be grounded when working on plugged-in equipment or making live adjustments, and remove all jewellery first.

* The controller-I/O board contains CMOS parts; handle chips, ROMs and SIMMs by their edges.

* The printer weighs 45 lb.

* Toner is non-toxic (plastic, iron and a little pigment). Remove it with a dry tissue and wash with cold water; hot water makes it gel and fuse into fabric. Toner attacks vinyl.

* Never use an ammonia-based cleaner on the LaserWriter II; it discolours the plastic.

=== ~~Consumables~~ ===

== Status LEDs ==

* '''Toner cartridge:''' Apple M6002 or HP 92295A

The LaserWriter II has four status LEDs, all on the front panel.<ref name="asg" /><ref name="train" />

* '''Yield:''' Approximately 4,000 pages at 5% coverage

* '''Drum life:''' Integrated with toner cartridge

* '''Paper tray:''' 250-sheet capacity letter/~~legal cassette~~

* '''Manual feed:''' Single-sheet bypass for special media

== ~~ROM Fonts =~~=

{| class="wikitable styled-table" style="width:92%;"

|+'''LaserWriter II status LEDs'''

! LED !! Colour !! Behaviour

|-

| Ready || Green || Flashes during warm-up and while printing; steady when ready; off when the printer is not ready, an error exists or the top cover is open

|-

| Low-Toner || Orange || Steady when the toner cartridge needs replacing; flashes when the cartridge is installed incorrectly

|-

| Paper-Out || Red || Steady when out of paper or the paper tray is missing; flashes when the printer is ready for a manually fed sheet

|-

| Paper Jam || Red || On when paper jams, until the jam is cleared

|}

~~The LaserWriter IINT included 35 built~~-~~in PostScript Type 1 fonts (same as LaserWriter Plus):~~

When the Paper-Out and Paper Jam lights flash together, the controller-I/O board or the print engine has an error condition.<ref name="asg" />

=== ~~Core Font Families~~ ===

=== Things that are not faults ===

* After a new toner cartridge is fitted, the NT's Low-Toner LED stays on until the printer produces a printout or is switched off and on again.<ref name="asg" />

* A flashing Low-Toner LED means the cartridge is seated wrongly.<ref name="asg" />

* A flashing Paper-Out LED means the printer is waiting for a hand-fed sheet.<ref name="asg" />

~~'''Times''' (4 styles):~~

== Test pages ==

* Times-~~Roman~~

The engine self-test page checks the print engine alone. Press the engine self-test switch on the side of the printer, behind the access cover; no computer or network is involved.<ref name="asg" />

* Times-Italic

* Times-Bold

* Times-~~BoldItalic~~

~~'''Helvetica''' (8 styles):~~

The NT prints a startup test page every time it is switched on, unless this has been turned off with PostScript software or with the LaserWriter Utility on the LaserWriter II Installation disk. It confirms that the controller-I/O board works and shows the page count.<ref name="asg" />

* Helvetica

* Helvetica-~~Oblique~~

* Helvetica-Bold

* Helvetica-BoldOblique

* Helvetica-Narrow

* Helvetica-Narrow-Oblique

* Helvetica-Narrow-Bold

* Helvetica-Narrow-BoldOblique

~~'''Courier''' (4 styles):~~

A fault on the engine self-test page is in the engine. A printer that gives a clean self-test page but no startup page points to the controller-I/O board; one that passes both but will not print from a computer points to the cable, the switch settings, the driver or the host.<ref name="asg" />

* Courier

* Courier-~~Oblique~~

* Courier-~~Bold~~

* Courier-~~BoldOblique~~

=== ~~Display Fonts~~ ===

== Troubleshooting ==

=== Pre-power-on checklist ===

Apple's list, to work through before the flowcharts:<ref name="asg" />

* Line voltage 115 V AC ±10%

* Printer on a solid, level surface

* Room temperature 50-90 °F (10-32.5 °C), humidity 20% to 80%

* Not in a hot, humid or dusty place or near open flames

* Printer not exposed to ammonia gas

* Out of direct sunlight and well ventilated

* Cables and connectors OK

* Toner cartridge installed and containing toner

* Fuser roller cleaner felt in place and not dirty

* Print density dial set correctly

* Paper cassette properly loaded and paper within specification

* Transfer corona wire clean and unbroken

* I/O PCA DIP switches set correctly

'~~''ITC Avant Garde Gothic''' (4 styles)~~:

=== Troubleshooting order ===

* AvantGarde-~~Book~~

Apple's sequence is: work through the pre-power-on list; read the safety section before any live electrical check; for an SC or NT/NTX, start with Troubleshooting Flowchart 1 and continue function by function until every main function is verified; if a replacement module does not cure the fault, refit the original before going on; and carry out preventive maintenance before returning the printer.<ref name="asg" /> The status-LED diagnostic with the rotary switch and the LaserWriter II Test Connector applies only to the IIf and IIg.<ref name="asg" />

* AvantGarde-~~BookOblique~~

* AvantGarde-Demi

* AvantGarde-~~DemiOblique~~

~~'''ITC Bookman''' (4 styles):~~

=== Laser power output check ===

* Bookman-~~Light~~

This needs a laser power checker and a digital multimeter. The correct reading is 17.6 mV ±1.6 mV.<ref name="asg" />

* Bookman-~~LightItalic~~

# Put the printer on a grounded workbench pad and remove the controller-I/O board and the cover set.

* Bookman-~~Demi~~

# With the power off, open the laser access hatch on the laser/scanner assembly.

* Bookman-DemiItalic

# Insert the laser power checker with the detector facing the laser diode.

# Connect the black lead to the meter's common socket and the red lead to volts; set the meter to the 200 mV range.

# Defeat the top cover interlock switch with a nonmetallic tool, switch on and wait one minute for warm-up.

# Depress drum-sensitivity switches SW301 and SW302, below the top cover interlock switch, and press the service test print button.

# Read the meter: 17.6 mV ±1.6 mV.

'~~''New Century Schoolbook''' (4 styles):~~

If no power can be measured, Apple's order is to replace the laser/scanner assembly and repeat, then the DC controller PCA.<ref name="asg" /> The procedure runs the laser with the covers off and the interlock defeated.

* NewCenturySchlbk-Roman

* NewCenturySchlbk-Italic

* NewCenturySchlbk-Bold

* NewCenturySchlbk-BoldItalic

~~'''Palatino''' (4 styles):~~

== Preventive maintenance ==

* Palatino-Roman

Before starting, switch off and unplug, let the fuser rollers cool, take ESD precautions and lay a drop cloth against grease and toner.<ref name="asg" />

* Palatino-Italic

* Palatino-Bold

* Palatino-BoldItalic

=== ~~Specialty Fonts~~ ===

=== Page count ===

The number at the bottom of the startup test page is the pages printed since the controller-I/O board was installed. If the board has been replaced or upgraded, Apple's instruction is to check the Repair Log Label on the bottom of the printer and ask the customer.<ref name="asg" />

* '~~''Symbol:''' Mathematical~~ and ~~Greek characters~~

=== Apple's parts replacement schedule ===

* '''ZapfChancery-MediumItalic:''' Decorative script

Every 50,000 prints, replace the ozone filter and check the fan. Every 100,000 prints, replace the fuser assembly, the transfer guide assembly, the preconditioning exposure assembly, the paper feed roller assembly and the transfer corona assembly.<ref name="asg" />

* '''ZapfDingbats:''' Ornaments and ~~symbols~~

== ~~Interfaces~~ ==

=== Cleaning ===

{| class="wikitable styled-table" style="width:80%;"

=== ~~LocalTalk Interface~~ ===

|+'''Service points and cleaning materials'''

~~Primary networking interface for AppleTalk~~:

! Service point !! Tool or solvent

|-

'''~~LocalTalk Specifications:'''~~

| Primary corona wire || Cleaning brush supplied with the printer

* '''Physical layer:''' RS-422 differential signaling

|-

* '''Data rate:''' 230.4 kbps

| Transfer corona wire || Cotton swab (with isopropyl alcohol, for user cleaning)

* '''Topology:''' Bus with daisy-chaining

|-

* '''Maximum nodes:''' 32 devices theoretical (16 practical)

| Transfer guide || Cloth dampened with water

* '''Protocol:''' AppleTalk protocol stack

|-

* '''Connector:''' Mini-DIN-8

| Fuser rollers || Fuser cleaning pad

~~'''LocalTalk Features:'''~~

* Automatic node addressing

* Collision detection and ~~avoidance~~

* Network printer sharing

* Compatible with PhoneNET adapters

~~=== Serial Interfaces ===~~

~~The IINT provided dual serial connectivity:~~

~~'''RS-232 Interface:~~'''

* '''Connector:''' DB-25 female

* '''Data rate:''' Up to 19,200 baud

* '''Data format:''' 8 bits, no parity, 1 stop bit

* '''Flow control:''' XON/XOFF or ~~hardware (RTS/CTS)~~

* '''Usage:''' PC connectivity, terminal access

~~'''RS~~-~~422 Interface:'''~~

* '''Connector:''' Mini-DIN-8 (shared with ~~LocalTalk)~~

* '''Data rate:''' Up to 57,600 baud

* '''Protocol:''' AppleTalk or serial

* '''Cable length:''' Up to 1200 feet

~~'''Switch~~-~~Selectable Modes:'''~~

* LocalTalk (~~default)~~

* RS-232 serial

* RS-422 serial

* Diablo 630 emulation

~~=== ADB Port ===~~

~~Like the IISC~~, ~~the IINT included an unused ADB port:~~

* '''Connector:''' 4-pin mini-DIN

* '''Purpose:''' Reserved for future expansion

* '''Implementation:''' Non-functional

* '''Removed:''' Eliminated in IIf and IIg models

~~=== Interactive PostScript ===~~

~~Accessible via RS-232~~ for ~~direct control:~~

~~'''Terminal Access:'''~~

* Connect terminal to RS-232 port

* Settings: 19,200 baud, 8-N-1

* Type "executive" to enter interactive mode

* Direct PostScript programming possible

* Diagnostic information available

~~== Paper Handling ==~~

~~=== Input Specifications ===~~

* '''Standard cassette:''' 250 sheets

* '''Manual feed:''' Single sheets

* '''Paper sizes:''' Letter, Legal, A4, Executive, B5

* '''Paper weight:''' 16-28 lb bond (60-105 g/m²)

* '''Media types:''' Plain paper, transparencies, envelopes, labels

~~=== Output Specifications ===~~

* '''Output tray:''' 250-~~sheet capacity face-down~~

* '''Page order:''' First page on bottom

* '''Duplex:''' Manual duplex only

* '''Maximum monthly volume:''' 3,000 pages

~~== Diagnostic Features ==~~

~~=== Self~~-~~Test Page ===~~

~~The IINT printed a comprehensive test page showing:~~

* Printer model and serial number

* ROM version

* Installed RAM (2 MB)

* Page count

* Font samples (all 35 fonts)

* PostScript version

* Configuration settings

~~=== Status Indicators ===~~

~~Front panel LED indicators:~~

* '''Ready (green):''' Solid when ready

* '''Data (green):''' Flashing during data reception

* '''Paper (amber):''' Paper out or jam

* '''Service (red):''' Service required

~~=== Service Button ===~~

~~DC controller board service button:~~

* Single press: Print test page

* Hold during power-on: Continuous test mode

~~== Common Issues and Maintenance ==~~

~~=== Known Problems ===~~

{| ~~class="wikitable" style="width:90%; text-align:center;"~~

|~~+'''Common IINT Failures'''~~

~~! Component !! Symptoms !! Cause !! Repair~~

|-

| ~~DC controller~~ || ~~No power, random resets || Capacitor failure || Recap board~~

| Exterior case || Cloth dampened with water

|-

| ~~Logic board~~ || ~~PostScript errors || RAM failure || Replace RAM (requires desoldering)~~

| Separation claws || Cloth dampened with alcohol

|-

| ~~Power supply~~ || ~~Voltage instability || Aged capacitors || Replace all electrolytics~~

| Paper guide || Cloth dampened with alcohol

|-

| ~~Fuser assembly~~ || ~~Poor adhesion, wrinkled pages || Worn roller || Replace fuser unit~~

| Lower delivery guide || Cloth dampened with alcohol

|-

| ~~Corona wires~~ || ~~Light print, streaking || Contamination || Clean or replace~~

| Feeder guide || Cloth dampened with water

|-

| ~~Paper feed || Multiple feeds, jams || Worn~~ rollers || ~~Clean/replace rollers~~

| Registration rollers || Cloth dampened with water

|}

~~=== Capacitor Issues ===~~

The customer cleans the first five items as needed; the dealer cleans all ten every 12 months or at each service call.<ref name="asg" />

The ~~IINT logic board was prone to capacitor failure:~~

* Surface-mount capacitors leak over time

* Causes intermittent operation or ~~failure~~

* All capacitors should be replaced preventively

* Use 105°C rated replacements

==~~= Preventive Maintenance~~ ===

== Parts ==

Selected entries, common to the LaserWriter II range except where the NT is named:<ref name="asg" />

~~'''Service Intervals~~:~~'''~~

{| class="wikitable styled-table" style="width:80%;"

* '''Monthly:''' Clean corona wires with brush

! Part !! Number

* '''50,000 pages:''' General cleaning and inspection

|-

* '''100,~~000 pages:''' Replace transfer corona assembly~~

| Controller-I/O board, LW II NT || 661-0438

* '''200,000 pages:''' Replace fuser assembly

|-

* '''300,000 pages:''' Major overhaul recommended

| DC controller PCA || 661-0426

|-

~~'''Regular Cleaning:'''~~

| DC power supply, 110/115 V || 661-0424

* Toner vacuum with appropriate filter

|-

* Paper path cleaning with lint-~~free cloth~~

| DC power supply, 220/240 V || 661-0442

* Corona wire cleaning with supplied brush

|-

* Exterior wipe with damp cloth

| Fuse, 125 V 6.3 A || 941-0005

|-

~~=== Memory Issues ===~~

| Fuse, medium time lag 3.15 A, 250 V || 740-0061

~~The 2 MB fixed RAM configuration limitations:~~

|-

* Cannot be expanded

| High-voltage power supply || 661-0425

* Insufficient for very complex documents

|-

* May require document simplification

| Laser/scanner assembly || 661-0423

* Font downloading limited by available memory

|-

| Fuser assembly, 110/115 V || 661-0440

~~== Driver Software ==~~

|-

| Fuser assembly, 220/240 V || 661-0444

~~=== Macintosh Support ===~~

|-

* '''System 6.0.3~~:''' Minimum requirement~~

| Fuser heater, 100 V, 620 W || 938-0003

* '''System 7.0-~~7.5.5:''' Full support~~

|-

* '''LaserWriter driver:''' Version 5.2 or later

| Fuser heater, 220 V, 570 W || 938-0004

* '''Chooser extension:''' Standard AppleTalk

|-

| Fuser roller cleaner || 970-0049

~~=== PC Support ===~~

|-

* '''MS-~~DOS:''' PostScript drivers available~~

| Ozone filter || 961-0003

* '''Windows 3.~~x:''' PostScript driver support~~

|-

* '''OS/2:''' Native PostScript support

| Ozone filter (for case with door) || 961-0007

* '''Connection:''' RS-~~232 serial cable~~

|-

| Power supply block, 110/115 V || 661-0427

~~=== Printer Languages ===~~

|-

* '''PostScript Level 1:''' Primary language

| Power supply block, 220/240 V || 661-0443

* '''Diablo 630:''' Emulation mode for compatibility

|-

* '''HP LaserJet:''' Not supported (unlike IINTX)

| Distribution PCA || 971-0028

|-

~~== Service Information ==~~

| Transfer corona assembly || 971-0026

~~=== DIP Switch Settings ===~~

~~Internal DIP switches for configuration:~~

* '''SW1-~~2:''' Interface selection (LocalTalk/Serial)~~

* '''SW3:''' Diablo 630 emulation

* '''SW4:''' Reserved

* '''SW5-~~8:''' Diagnostic modes~~

~~=== Test Points ===~~

~~DC controller board test points:~~

* +5V DC logic supply

* +24V DC motor supply

* -~~12V DC bias supply~~

* High voltage (special probe required)

~~=== Voltage Adjustments ===~~

* Print density: Potentiometer on DC controller

* Registration: Mechanical laser alignment

* No user-~~adjustable voltages~~

~~== Upgrade Options ==~~

~~=== Controller Board Upgrades ===~~

~~The IINT could be upgraded to:~~

* '''IIf board:''' PostScript Level 2, ~~SCSI support~~

* '''IIg board:''' PostScript Level 2, ~~Ethernet~~

~~'''Upgrade Process:'''~~

~~# Remove IINT controller board~~

~~# Install replacement board~~

~~# Update printer drivers~~

~~# Configure new features~~

~~=== Comparison~~ with ~~Downgrade ===~~

~~The IINT could replace IISC controller for PostScript:~~

* Adds PostScript Level 1

* Adds LocalTalk networking

* Adds 35 built-~~in fonts~~

* Increases processor speed

~~== Comparison with LaserWriter II Series ==~~

{| ~~class="wikitable" style="width:95%; text~~-~~align:center;"~~

|~~+'''LaserWriter II Series Specifications'''~~

~~! Feature !! IISC !! IINT !! IINTX !! IIf !! IIg~~

|-

| ~~Processor~~ || ~~68000 @ 7.45 MHz || 68000 @ 11.5 MHz || 68020 @ 16.67 MHz || 68030 @ 25 MHz || 68030 @ 25 MHz~~

| Transfer guide assembly || 971-0019

|-

| ~~RAM~~ || ~~1 MB fixed || 2 MB fixed || 2-12 MB || 2-32 MB || 5~~-~~32 MB~~

| Paper feed roller assembly || 971-0017

|-

| ~~PostScript~~ || ~~No || Level 1 || Level 1 || Level 2 || Level 2~~

| Feeder assembly || 971-0018

|-

| ~~Fonts in ROM~~ || ~~0 || 35 || 35 || 35 || 35~~

| Delivery assembly || 971-0023

|-

| ~~LocalTalk~~ || ~~No || Yes || Yes || Yes || Yes~~

| Main motor assembly || 971-0014

|-

| ~~SCSI~~ || ~~Yes || No || Yes || Yes || Yes~~

| Fan, lower || 959-0021

|-

| ~~Ethernet~~ || ~~No || No || No || No || Yes~~

| Fan, upper || 959-0022

|-

| ~~HP PCL~~ || ~~No || No || Yes || Yes || Yes~~

| Status panel || 971-0005

|-

| ~~Price (1988) || $2,999 || $4,599 || $5,999 || -~~ || -

| Cleaning brush || 970-0047

|-

| ~~Price (1991)~~ || - ~~|| - || - || $3,599 || $4,599~~

| Mirror assembly || 971-0007

|}

~~== Compatibility ==~~

The DC power supply, fuser assembly, fuser heater and power supply block are different parts for 110 V and 220 V machines, and the two fuser heaters are rated 620 W at 100 V and 570 W at 220 V.<ref name="asg" />

~~=== System Requirements ===~~

~~'''Macintosh:'''~~

* System 6.0.3 or later

* LaserWriter driver 5.~~2 or later~~

* LocalTalk or serial connection

~~'''Apple II:'''~~

* Apple IIgs with AppleTalk card

* Apple IIe with Workstation Card

~~'''PC:'''~~

* PostScript-aware application

* RS-232 serial port

* Appropriate driver software

~~=== Network Compatibility ===~~

* AppleTalk Phase 1 and Phase 2

* LocalTalk compatible

* PhoneNET compatible

* EtherTalk bridge compatible

~~== Service Manual ==~~

<~~pdf width~~="~~800~~" ~~height="500">File:LaserWriter_II_Service.pdf<~~/~~pdf~~>

~~The LaserWriter II series service manual is available on the [[:Category:Apple Service Source|Apple Service Source]] page.~~

== ~~Successor Models~~ ==

== Service manuals ==

<pdf>File:Apple LaserWriter Printers Volume I.pdf</pdf>

~~=== Personal~~ LaserWriter ~~NT ===~~

<pdf>File:Apple LaserWriter II Service Training Participant Manual Version 1.1 Oct 1992.pdf</pdf>

~~Released July 1990 as lower-cost alternative:~~

* Reduced to 2 MB RAM (non-expandable)

* Smaller footprint

* Lower price point

* Same 68000 processor

==~~= LaserWriter IIf =~~==

== Related pages ==

~~Released October 1991 as direct replacement:~~

* [[Apple LaserWriter II SC]]

* ~~68030 processor at 25 MHz~~

* [[Apple LaserWriter]]

* ~~PostScript Level 2~~

* [[Apple LaserWriter Plus]]

* ~~2-32 MB RAM expandable~~

* [[Apple Personal LaserWriter 300]]

* ~~SCSI interface added~~

* [[LaserWriter II Service Source]]

* ~~PhotoGrade and FinePrint options~~

== ~~Related Pages~~ ==

== References ==

* [[LaserWriter IISC]]

* [[LaserWriter IINTX]]

* [[LaserWriter IIf]]

* [[LaserWriter IIg]]

* [[LocalTalk]]

* [[PostScript]]

[[Category:Apple Vintage Accessories]]

@@ Line 1: / Line 1: @@
 {{Infobox computer peripheral
-| name         = Apple LaserWriter IINT
+| name         = Apple LaserWriter II NT
-| image        = [[File:Apple_LaserWriter_IINT.jpg|250px]]
+| image        = [[File:Apple LaserWriter II (All About Apple museum).jpg|260px|frameless]]
-| caption      = Apple LaserWriter IINT (1988)
+| caption      = Apple LaserWriter II (the NT, SC and NTX share this case)
 | manufacturer = Apple Computer, Inc.
 | type         = Laser printer
-| release date = January 1988
+| interface    = LocalTalk / RS-422 (mini DIN-8); RS-232 (DB-25); Apple Desktop Bus connector present
-| discontinued = October 1, 1991
+| compatible   = Macintosh; other computers over RS-232
-| price        = US$4,599 (1988 retail)
+| dimensions   = 8.6 in high &times; 20 in wide &times; 18.5 in deep
-| interface    = LocalTalk, RS-232/RS-422 serial, ADB
+| weight       = 45 lb (20.25 kg)
-| compatible   = Macintosh, Apple II, PC (via RS-232)
+| power        = 90-126 V AC, 50-60 Hz
-| dimensions   = 8.7" H × 20.2" W × 18.7" D
+| part_number  = 661-0438 (NT controller-I/O board)
-| weight       = 45 lbs (20.4 kg)
-| power        = 900W maximum, 90-126V/50-60Hz
-| model        = M6000
 }}
+<templatestyles src="Template:StyledTable/styles.css" />
+The '''Apple LaserWriter II NT''' is the PostScript member of the LaserWriter II range. It shares the Canon LBP-SX engine, the case, the power supply and the mechanical parts with the [[Apple LaserWriter II SC|II SC]] and the NTX. Its controller-I/O board has a 68000 at 11.16 MHz, 1.0 MB of ROM and 2.0 MB of RAM, and runs PostScript and Diablo 630 emulation over LocalTalk, RS-232 and RS-422.<ref name="asg">''Apple Service Guide for LaserWriter Printers, Volume I'', Apple Computer, Inc., January 1992 (072-0631-B), hosted on this wiki as [[Apple LaserWriter Printers Volume I]] ([[:File:Apple LaserWriter Printers Volume I.pdf|PDF]]). Covers the LaserWriter, LaserWriter Plus, LaserWriter II SC/NT/NTX/IIf/IIg and Personal LaserWriter SC/NT/LS. Introductory safety section: the high-voltage, optical-fibre, fuser-cooling, ESD, not-being-grounded and lifting warnings; the LaserWriter Safety Rules; the toner-safety paragraph; the laser-safety paragraph and the three laser warning labels. Tab 3, LaserWriter II: parts list including the NT controller-I/O board and its ROM set (pages 4-5); controller-I/O board specifications (page 10); print engine specifications (page 11); status LEDs (page 12); test pages (page 13); the pre-power-on checklist, the troubleshooting flowcharts and tables including the NT low-toner note (pages 14-54); the laser power output check (page 55); and preventive maintenance including the page count, the parts replacement schedule and the user and standard maintenance tables (pages 59-60). Tab 6, Ports and Cables: the peripheral cable table, external connector diagrams, the RS-422 and RS-232 pin-outs and the LaserWriter II NT switch configuration table.</ref> Read the [[#Safety|Safety]] section before taking the covers off: the printer contains an invisible laser, a fuser that needs five minutes to cool, and a high-voltage supply for the coronas.
-The '''Apple LaserWriter IINT''' was a midrange laser printer in the LaserWriter II series, released in January 1988 at US$4,599. The IINT positioned between the budget IISC and high-end IINTX models, offering full PostScript Level 1 support and LocalTalk networking. The printer featured a Motorola 68000 processor running at 11.5 MHz with 2 MB of fixed RAM and 1 MB ROM containing 35 built-in fonts. Using the Canon LBP-SX print engine shared across the LaserWriter II line, the IINT delivered 300 dpi resolution at 8 pages per minute. Performance improvements over earlier models came from elimination of memory wait states, providing faster PostScript rasterization. The IINT was discontinued in October 1991, replaced by the LaserWriter IIf.
+== Controller-I/O board ==
+{| class="wikitable styled-table" style="width:95%;"
+|+'''Controller-I/O board specifications, LaserWriter II range'''
+! !! SC !! NT !! NTX !! IIf !! IIg
+|-
+| CPU || 68000 (7.45 MHz) || 68000 (11.16 MHz) || 68020 (16.67 MHz) || 68030 (20.0 MHz) || 68030 (25.0 MHz)
+|-
+| ROM || 16 KB || 1.0 MB || 1.0 MB || 2.0 MB || 2.0 MB
+|-
+| RAM || 1.0 MB || 2.0 MB || 2.0 MB, expandable to 12 MB || 2.0 MB, expandable to 32 MB || 5.0 MB, expandable to 32 MB
+|-
+| I/O || SCSI || LocalTalk, RS-232, RS-422 || LocalTalk, RS-232, RS-422, SCSI || LocalTalk, RS-232, RS-422, SCSI || LocalTalk, RS-232, RS-422, SCSI, Ethernet
+|-
+| Imaging languages || QuickDraw || PostScript, Diablo 630 || PostScript, Diablo 630, HP LaserJet || PostScript Level 1 and 2, HP LaserJet IIP || PostScript Level 1 and 2, HP LaserJet IIP
+|-
+| Built-in fonts || Times, Helvetica, Courier, Symbol || Times, Courier, Symbol, Palatino, Helvetica, Helvetica Narrow, ITC Bookman, ITC Avant Garde, ITC Zapf Chancery, New Century Schoolbook, ITC Zapf Dingbats || As NT || As NT || As NT
+|}
+<ref name="asg" />
-== Technical Specifications ==
+Apple's guide gives memory upgrade procedures for the NTX and the IIf/IIg, and none for the NT, whose 2.0 MB is fixed.<ref name="asg" />
-=== Physical Specifications ===
+=== Board layout ===
-* '''Dimensions:''' 8.7" H × 20.2" W × 18.7" D (221 × 513 × 475 mm)
+Apple's service course diagram of the NT controller-I/O board shows an MC68000, a 6532, an 8530 SCC, 1 MB of ROM, 2 MB of RAM and SRAMs, with the Apple Desktop Bus connector, a two-position switch, the RS-232 port and the LocalTalk/RS-422 port along the back panel. The board connects to the print engine through a 32-pin right-angle connector that engages as the board slides into its guide rails.<ref name="train">''Apple Service Training: LaserWriter II Service Course, Participant Manual, Version 1.1'', Apple Computer, Inc., October 1992, hosted on this wiki as [[Apple Laserwriter Ii Service Training Participant Manual Version 1.1 Oct 1992|LaserWriter II Service Course: Participant Manual]] ([[:File:Apple LaserWriter II Service Training Participant Manual Version 1.1 Oct 1992.pdf|PDF]]). Module 1, "LaserWriter II Parts and Functions": the SC, NT and NTX I/O board block diagrams and back panels (figures 1-3 to 1-5) and the 32-pin right-angle engine connector; the four-subsystem breakdown (power distribution, control, image formation, pickup/feed); the power distribution diagram (figure 1-7); the DC controller PCB's role; the interlock switch at the top of the DC power supply; the status panel description; the distribution PCA (figure 1-12) with drum-sensitivity switches SW301 and SW302, pickup solenoid SL301, registration clutch solenoid SL302, paper-out sensor PS301 and manual feed sensor PS302; and paper delivery sensor PS331 on the fuser PCA.</ref>
-* '''Weight:''' 45 lbs (20.4 kg)
-* '''Operating temperature:''' 50°F to 90°F (10°C to 32°C)
-* '''Humidity:''' 20% to 80% non-condensing
-* '''Acoustic noise:''' 48 dBA operating
-=== Performance ===
+=== Board and ROM part numbers ===
-* '''Print speed:''' 8 pages per minute
+{| class="wikitable styled-table" style="width:70%;"
-* '''Resolution:''' 300 × 300 dpi
+|+'''NT controller-I/O board'''
-* '''First page out:''' Approximately 30 seconds
+! Part !! Number
-* '''Engine life:''' 300,000 pages rated
+|-
-* '''Duty cycle:''' 3,000 pages per month recommended
+| Controller-I/O board, LW II NT || 661-0438
+|-
+| IC, ROM, L0 || 342-0545
+|-
+| IC, ROM, H0 || 342-0546
+|-
+| IC, ROM, L1 || 342-0547
+|-
+| IC, ROM, H1 || 342-0548
+|-
+| IC, ROM, L2 || 342-0549
+|-
+| IC, ROM, H2 || 342-0550
+|-
+| IC, ROM, L3 || 342-0551
+|-
+| IC, ROM, H3 || 342-0552
+|}
+<ref name="asg" />
-=== Power Requirements ===
+The NT board carries eight ROMs in high and low pairs, L0/H0 to L3/H3. The NTX takes eight differently numbered ROMs (342-0560 to 342-0567, or 342-0711 to 342-0718 on the rev. 3 board), and the IIf and IIg take four (076-0860 to 076-0863).<ref name="asg" />
-* '''Input voltage:''' 90-126V AC (auto-ranging)
-* '''Frequency:''' 50-60 Hz
-* '''Power consumption:''' 900W maximum
-* '''Current draw:''' 7.5A maximum
-* '''Heat output:''' 3,078 BTU per hour
-== System Architecture ==
+== Ports and switches ==
+The rear panel carries, left to right, an Apple Desktop Bus connector, the switches, the RS-232 port and the LocalTalk/RS-422 port. The SC, NT and NTX have the ADB connector; the IIf and IIg do not, and use a pushbutton switch instead. Apple's guide shows the connector but describes no function for it.<ref name="asg" />
-=== Processor and Memory ===
+{| class="wikitable styled-table" style="width:70%;"
-The LaserWriter IINT used an optimized 68000 configuration:
+|+'''RS-422 / LocalTalk, mini DIN-8 (as on the NTX, IIf, IIg and Personal LaserWriter NT)'''
+! Pin !! Signal !! Description
+|-
+| 1 || HSKo || Handshake out
+|-
+| 2 || HSKi || Handshake in
+|-
+| 3 || TxD&minus; || Transmit data &minus;
+|-
+| 4 || SG || Signal ground
+|-
+| 5 || RxD&minus; || Receive data &minus;
+|-
+| 6 || TxD+ || Transmit data +
+|-
+| 7 || GPi || General-purpose input
+|-
+| 8 || RxD+ || Receive data +
+|}
+<ref name="asg" />
-'''Central Processing Unit:'''
+{| class="wikitable styled-table" style="width:70%;"
-* '''CPU:''' Motorola MC68000
+|+'''RS-232, DB-25'''
-* '''Clock speed:''' 12 MHz crystal (operating at 11.5 MHz)
+! Pin !! Signal !! Description
-* '''Data bus:''' 16-bit
+|-
-* '''Address bus:''' 24-bit (16 MB addressable)
+| 1 || SGND || Signal ground
-* '''Wait states:''' None (improved from LaserWriter Plus)
+|-
+| 2 || TxD || Transmitted data
+|-
+| 3 || RxD || Received data
+|-
+| 4 || RTS || Request to send
+|-
+| 5 || CTS || Clear to send
+|-
+| 6 || DSR || Data set ready
+|-
+| 7 || SG || Signal ground
+|-
+| 8 || DCD || Data carrier detect
+|-
+| 20 || DTR || Data terminal ready
+|-
+| 22 || RI || Ring indicator
+|}
+<ref name="asg" />
-'''Memory Configuration:'''
+=== Switch configurations ===
-* '''ROM:''' 1 MB mask ROM
+The NT has two switches:<ref name="asg" />
-* '''RAM:''' 2 MB total (fixed, soldered to board)
-  * PostScript workspace and font cache
-  * Frame buffer for page rasterization
-* '''RAM type:''' Fast DRAM (no wait states)
-* '''Memory expansion:''' None possible
-* '''Performance:''' Faster rasterization than LaserWriter Plus
-=== Controller Board Design ===
+{| class="wikitable styled-table" style="width:70%;"
-The IINT controller featured improved architecture:
+|+'''LaserWriter II NT switch configurations'''
+! Communication and command mode !! 1 !! 2
+|-
+| LocalTalk || Up || Up
+|-
+| Diablo 630 emulation || Down || Up
+|-
+| 9600 baud RS-232 and RS-422 || Up || Down
+|-
+| 1200 baud RS-232 and RS-422 || Down || Down
+|}
+<ref name="asg" />
-* '''PostScript interpreter:''' Level 1 implementation
+The NTX has a six-switch bank with separate command-mode and handshaking groups, including a PostScript interactive mode and an HP LaserJet mode.<ref name="asg" />
-* '''Font management:''' 35 fonts in ROM
-* '''Graphics processing:''' Vector and bitmap support
-* '''Interface logic:''' PAL-based design
-* '''Memory controller:''' Zero wait-state access
-=== PostScript Implementation ===
+Apple's cable for the NT is the LocalTalk Connector Kit, DIN-8, service part 590-0338 or 630-8275, model M2068, the same kit as for the NTX, IIf, IIg and Personal LaserWriter NT.<ref name="asg" />
-'''PostScript Specifications:'''
-* '''Version:''' PostScript Level 1
-* '''Licensor:''' Adobe Systems
-* '''Language features:''' Complete programming language
-* '''Graphics:''' Vector graphics, Bézier curves, transformations
-* '''Font handling:''' Type 1 and Type 3 support
-* '''Emulation:''' Diablo 630 mode available
-'''Performance Improvements:'''
+== Print engine ==
-* Eliminated wait states from LaserWriter Plus
+{| class="wikitable styled-table" style="width:90%;"
-* Faster font cache management
+|+'''LaserWriter II print engine specifications'''
-* Improved complex page handling
+| Marking engine || Canon LBP-SX laser xerographic
-* Reduced processing time for graphics
+|-
+| Print resolution || 300 dots per inch
+|-
+| Speed || 8 pages per minute
+|-
+| Print materials || Letter, legal, A4 and B5 in 16-20 lb single-sheet photocopy bond, 8-34 lb letterhead and coloured stock, or overhead transparency film. Envelopes, labels and paper up to 36 lb by manual feed; envelopes also from an optional envelope tray
+|-
+| Print capacities || Paper cassettes hold 200 sheets of 20 lb paper; the envelope cassette holds 15 envelopes
+|-
+| Printable surface || Letter 8.0 &times; 10.5 in; Legal 8.0 &times; 13.0 in; A4 7.41 &times; 10.86 in; B5 7.69 &times; 10.16 in
+|-
+| Physical dimensions || Height 8.6 in (21.8 cm); width 20 in (50.8 cm); depth 18.5 in (47 cm); weight 45 lb (20.25 kg)
+|-
+| Operating environment || 50 to 90&nbsp;&deg;F (10 to 32.5&nbsp;&deg;C); humidity 20% to 80%
+|-
+| Power requirements || 90 to 126 V AC; 50 to 60 Hz
+|}
+<ref name="asg" />
-== Print Engine ==
+=== The four subsystems ===
+Apple's service course divides the engine into four subsystems:<ref name="train" />
+* Power distribution: the AC inlet and power switch, the AC driver board and fuser heater, the DC power supply/motor driver PCA, the high-voltage power supply for the primary corona, transfer corona and developing bias, and the distribution PCA.
+* Control: the DC controller PCB, which receives the print command from the controller-I/O board, controls the rest of the engine and reports status on the front-panel LEDs. The course tells technicians always to check the DC controller, because a module that seems faulty may not have received its command or its supply.
+* Image formation: the laser diode, scanning motor and optical fibre, the photosensitive drum, the coronas, the static-charge eliminator, the toner sensor and the fuser.
+* Pickup and feed: the cassette, the pickup and registration rollers, their solenoids and the paper sensors.
-=== Canon LBP-SX Engine ===
+=== Sensors, switches and solenoids ===
-The IINT used the improved Canon LBP-SX engine:
+{| class="wikitable styled-table" style="width:85%;"
+|+'''Pickup/feed and control devices (service course)'''
+! Designator !! Location !! Function
+|-
+| PS301 || Distribution PCA || Paper-out sensor; senses paper in the cassette
+|-
+| PS302 || Distribution PCA || Manual feed sensor; uses the same arm as PS301
+|-
+| PS331 || Fuser PCA or fuser assembly PCA || Paper delivery sensor. If paper fails to reach and clear it in time, a jam is reported
+|-
+| SL301 || Distribution PCA || Pickup roller solenoid; engages the clutch that turns the pickup roller
+|-
+| SL302 || Distribution PCA || Registration roller clutch solenoid
+|-
+| SW301, SW302 || Distribution PCA || Drum-sensitivity switches, set by the toner cartridge
+|-
+| Interlock switch || Top of the DC power supply || Cuts power when the upper unit opens
+|}
+<ref name="train" />
-'''Engine Specifications:'''
+Because PS301 and PS302 share one arm, a bent or sticking arm can affect both the paper-out and the manual-feed indications.<ref name="train" />
-* '''Technology:''' Laser xerography (electrophotographic)
-* '''Photosensitive drum:''' Organic photoconductor (OPC)
-* '''Laser type:''' Semiconductor laser diode
-* '''Developer system:''' Single-component toner
-* '''Fusing:''' Heat roller system
-* '''Paper path:''' Straight-through design
-'''Advantages over LBP-CX:'''
+== Safety ==
-* 32% weight reduction
+The LaserWriter family safety rules apply:<ref name="asg" />
-* Improved reliability
+* Switch off and disconnect the power cord before servicing. Parts are live under power; never work on the printer under power except when making live adjustments. With the covers off and the power on, do not touch the high-voltage power supply, the DC power supply or the power supply block.
-* Quieter operation
+* Do not disconnect the optical fibre cable with the printer on. It carries the infrared laser beam, which cannot be seen and can permanently damage the eyes. Keep screwdrivers and other shiny objects out of the beam path; the reflection is equally dangerous. The warning labels inside the covers read "DANGER - INVISIBLE LASER RADIATION WHEN OPEN. AVOID DIRECT EXPOSURE TO BEAM."
-* Better paper handling
+* The fuser rollers become very hot. Switch off for at least five minutes before servicing them.
-* Longer component life
+* Do not be grounded when working on plugged-in equipment or making live adjustments, and remove all jewellery first.
+* The controller-I/O board contains CMOS parts; handle chips, ROMs and SIMMs by their edges.
+* The printer weighs 45 lb.
+* Toner is non-toxic (plastic, iron and a little pigment). Remove it with a dry tissue and wash with cold water; hot water makes it gel and fuse into fabric. Toner attacks vinyl.
+* Never use an ammonia-based cleaner on the LaserWriter II; it discolours the plastic.
-=== Consumables ===
+== Status LEDs ==
-* '''Toner cartridge:''' Apple M6002 or HP 92295A
+The LaserWriter II has four status LEDs, all on the front panel.<ref name="asg" /><ref name="train" />
-* '''Yield:''' Approximately 4,000 pages at 5% coverage
-* '''Drum life:''' Integrated with toner cartridge
-* '''Paper tray:''' 250-sheet capacity letter/legal cassette
-* '''Manual feed:''' Single-sheet bypass for special media
-== ROM Fonts ==
+{| class="wikitable styled-table" style="width:92%;"
+|+'''LaserWriter II status LEDs'''
+! LED !! Colour !! Behaviour
+|-
+| Ready || Green || Flashes during warm-up and while printing; steady when ready; off when the printer is not ready, an error exists or the top cover is open
+|-
+| Low-Toner || Orange || Steady when the toner cartridge needs replacing; flashes when the cartridge is installed incorrectly
+|-
+| Paper-Out || Red || Steady when out of paper or the paper tray is missing; flashes when the printer is ready for a manually fed sheet
+|-
+| Paper Jam || Red || On when paper jams, until the jam is cleared
+|}
+<ref name="asg" />
-The LaserWriter IINT included 35 built-in PostScript Type 1 fonts (same as LaserWriter Plus):
+When the Paper-Out and Paper Jam lights flash together, the controller-I/O board or the print engine has an error condition.<ref name="asg" />
-=== Core Font Families ===
+=== Things that are not faults ===
+* After a new toner cartridge is fitted, the NT's Low-Toner LED stays on until the printer produces a printout or is switched off and on again.<ref name="asg" />
+* A flashing Low-Toner LED means the cartridge is seated wrongly.<ref name="asg" />
+* A flashing Paper-Out LED means the printer is waiting for a hand-fed sheet.<ref name="asg" />
-'''Times''' (4 styles):
+== Test pages ==
-* Times-Roman
+The engine self-test page checks the print engine alone. Press the engine self-test switch on the side of the printer, behind the access cover; no computer or network is involved.<ref name="asg" />
-* Times-Italic
-* Times-Bold
-* Times-BoldItalic
-'''Helvetica''' (8 styles):
+The NT prints a startup test page every time it is switched on, unless this has been turned off with PostScript software or with the LaserWriter Utility on the LaserWriter II Installation disk. It confirms that the controller-I/O board works and shows the page count.<ref name="asg" />
-* Helvetica
-* Helvetica-Oblique
-* Helvetica-Bold
-* Helvetica-BoldOblique
-* Helvetica-Narrow
-* Helvetica-Narrow-Oblique
-* Helvetica-Narrow-Bold
-* Helvetica-Narrow-BoldOblique
-'''Courier''' (4 styles):
+A fault on the engine self-test page is in the engine. A printer that gives a clean self-test page but no startup page points to the controller-I/O board; one that passes both but will not print from a computer points to the cable, the switch settings, the driver or the host.<ref name="asg" />
-* Courier
-* Courier-Oblique
-* Courier-Bold
-* Courier-BoldOblique
-=== Display Fonts ===
+== Troubleshooting ==
+=== Pre-power-on checklist ===
+Apple's list, to work through before the flowcharts:<ref name="asg" />
+* Line voltage 115 V AC &plusmn;10%
+* Printer on a solid, level surface
+* Room temperature 50-90&nbsp;&deg;F (10-32.5&nbsp;&deg;C), humidity 20% to 80%
+* Not in a hot, humid or dusty place or near open flames
+* Printer not exposed to ammonia gas
+* Out of direct sunlight and well ventilated
+* Cables and connectors OK
+* Toner cartridge installed and containing toner
+* Fuser roller cleaner felt in place and not dirty
+* Print density dial set correctly
+* Paper cassette properly loaded and paper within specification
+* Transfer corona wire clean and unbroken
+* I/O PCA DIP switches set correctly
-'''ITC Avant Garde Gothic''' (4 styles):
+=== Troubleshooting order ===
-* AvantGarde-Book
+Apple's sequence is: work through the pre-power-on list; read the safety section before any live electrical check; for an SC or NT/NTX, start with Troubleshooting Flowchart 1 and continue function by function until every main function is verified; if a replacement module does not cure the fault, refit the original before going on; and carry out preventive maintenance before returning the printer.<ref name="asg" /> The status-LED diagnostic with the rotary switch and the LaserWriter II Test Connector applies only to the IIf and IIg.<ref name="asg" />
-* AvantGarde-BookOblique
-* AvantGarde-Demi
-* AvantGarde-DemiOblique
-'''ITC Bookman''' (4 styles):
+=== Laser power output check ===
-* Bookman-Light
+This needs a laser power checker and a digital multimeter. The correct reading is 17.6 mV &plusmn;1.6 mV.<ref name="asg" />
-* Bookman-LightItalic
+# Put the printer on a grounded workbench pad and remove the controller-I/O board and the cover set.
-* Bookman-Demi
+# With the power off, open the laser access hatch on the laser/scanner assembly.
-* Bookman-DemiItalic
+# Insert the laser power checker with the detector facing the laser diode.
+# Connect the black lead to the meter's common socket and the red lead to volts; set the meter to the 200 mV range.
+# Defeat the top cover interlock switch with a nonmetallic tool, switch on and wait one minute for warm-up.
+# Depress drum-sensitivity switches SW301 and SW302, below the top cover interlock switch, and press the service test print button.
+# Read the meter: 17.6 mV &plusmn;1.6 mV.
-'''New Century Schoolbook''' (4 styles):
+If no power can be measured, Apple's order is to replace the laser/scanner assembly and repeat, then the DC controller PCA.<ref name="asg" /> The procedure runs the laser with the covers off and the interlock defeated.
-* NewCenturySchlbk-Roman
-* NewCenturySchlbk-Italic
-* NewCenturySchlbk-Bold
-* NewCenturySchlbk-BoldItalic
-'''Palatino''' (4 styles):
+== Preventive maintenance ==
-* Palatino-Roman
+Before starting, switch off and unplug, let the fuser rollers cool, take ESD precautions and lay a drop cloth against grease and toner.<ref name="asg" />
-* Palatino-Italic
-* Palatino-Bold
-* Palatino-BoldItalic
-=== Specialty Fonts ===
+=== Page count ===
+The number at the bottom of the startup test page is the pages printed since the controller-I/O board was installed. If the board has been replaced or upgraded, Apple's instruction is to check the Repair Log Label on the bottom of the printer and ask the customer.<ref name="asg" />
-* '''Symbol:''' Mathematical and Greek characters
+=== Apple's parts replacement schedule ===
-* '''ZapfChancery-MediumItalic:''' Decorative script
+Every 50,000 prints, replace the ozone filter and check the fan. Every 100,000 prints, replace the fuser assembly, the transfer guide assembly, the preconditioning exposure assembly, the paper feed roller assembly and the transfer corona assembly.<ref name="asg" />
-* '''ZapfDingbats:''' Ornaments and symbols
-== Interfaces ==
+=== Cleaning ===
+{| class="wikitable styled-table" style="width:80%;"
-=== LocalTalk Interface ===
+|+'''Service points and cleaning materials'''
-Primary networking interface for AppleTalk:
+! Service point !! Tool or solvent
+|-
-'''LocalTalk Specifications:'''
+| Primary corona wire || Cleaning brush supplied with the printer
-* '''Physical layer:''' RS-422 differential signaling
+|-
-* '''Data rate:''' 230.4 kbps
+| Transfer corona wire || Cotton swab (with isopropyl alcohol, for user cleaning)
-* '''Topology:''' Bus with daisy-chaining
+|-
-* '''Maximum nodes:''' 32 devices theoretical (16 practical)
+| Transfer guide || Cloth dampened with water
-* '''Protocol:''' AppleTalk protocol stack
+|-
-* '''Connector:''' Mini-DIN-8
+| Fuser rollers || Fuser cleaning pad
-'''LocalTalk Features:'''
-* Automatic node addressing
-* Collision detection and avoidance
-* Network printer sharing
-* Compatible with PhoneNET adapters
-=== Serial Interfaces ===
-The IINT provided dual serial connectivity:
-'''RS-232 Interface:'''
-* '''Connector:''' DB-25 female
-* '''Data rate:''' Up to 19,200 baud
-* '''Data format:''' 8 bits, no parity, 1 stop bit
-* '''Flow control:''' XON/XOFF or hardware (RTS/CTS)
-* '''Usage:''' PC connectivity, terminal access
-'''RS-422 Interface:'''
-* '''Connector:''' Mini-DIN-8 (shared with LocalTalk)
-* '''Data rate:''' Up to 57,600 baud
-* '''Protocol:''' AppleTalk or serial
-* '''Cable length:''' Up to 1200 feet
-'''Switch-Selectable Modes:'''
-* LocalTalk (default)
-* RS-232 serial
-* RS-422 serial
-* Diablo 630 emulation
-=== ADB Port ===
-Like the IISC, the IINT included an unused ADB port:
-* '''Connector:''' 4-pin mini-DIN
-* '''Purpose:''' Reserved for future expansion
-* '''Implementation:''' Non-functional
-* '''Removed:''' Eliminated in IIf and IIg models
-=== Interactive PostScript ===
-Accessible via RS-232 for direct control:
-'''Terminal Access:'''
-* Connect terminal to RS-232 port
-* Settings: 19,200 baud, 8-N-1
-* Type "executive" to enter interactive mode
-* Direct PostScript programming possible
-* Diagnostic information available
-== Paper Handling ==
-=== Input Specifications ===
-* '''Standard cassette:''' 250 sheets
-* '''Manual feed:''' Single sheets
-* '''Paper sizes:''' Letter, Legal, A4, Executive, B5
-* '''Paper weight:''' 16-28 lb bond (60-105 g/m²)
-* '''Media types:''' Plain paper, transparencies, envelopes, labels
-=== Output Specifications ===
-* '''Output tray:''' 250-sheet capacity face-down
-* '''Page order:''' First page on bottom
-* '''Duplex:''' Manual duplex only
-* '''Maximum monthly volume:''' 3,000 pages
-== Diagnostic Features ==
-=== Self-Test Page ===
-The IINT printed a comprehensive test page showing:
-* Printer model and serial number
-* ROM version
-* Installed RAM (2 MB)
-* Page count
-* Font samples (all 35 fonts)
-* PostScript version
-* Configuration settings
-=== Status Indicators ===
-Front panel LED indicators:
-* '''Ready (green):''' Solid when ready
-* '''Data (green):''' Flashing during data reception
-* '''Paper (amber):''' Paper out or jam
-* '''Service (red):''' Service required
-=== Service Button ===
-DC controller board service button:
-* Single press: Print test page
-* Hold during power-on: Continuous test mode
-== Common Issues and Maintenance ==
-=== Known Problems ===
-{| class="wikitable" style="width:90%; text-align:center;"
-|+'''Common IINT Failures'''
-! Component !! Symptoms !! Cause !! Repair
 |-
-| DC controller || No power, random resets || Capacitor failure || Recap board
+| Exterior case || Cloth dampened with water
 |-
-| Logic board || PostScript errors || RAM failure || Replace RAM (requires desoldering)
+| Separation claws || Cloth dampened with alcohol
 |-
-| Power supply || Voltage instability || Aged capacitors || Replace all electrolytics
+| Paper guide || Cloth dampened with alcohol
 |-
-| Fuser assembly || Poor adhesion, wrinkled pages || Worn roller || Replace fuser unit
+| Lower delivery guide || Cloth dampened with alcohol
 |-
-| Corona wires || Light print, streaking || Contamination || Clean or replace
+| Feeder guide || Cloth dampened with water
 |-
-| Paper feed || Multiple feeds, jams || Worn rollers || Clean/replace rollers
+| Registration rollers || Cloth dampened with water
 |}
+<ref name="asg" />
-=== Capacitor Issues ===
+The customer cleans the first five items as needed; the dealer cleans all ten every 12 months or at each service call.<ref name="asg" />
-The IINT logic board was prone to capacitor failure:
-* Surface-mount capacitors leak over time
-* Causes intermittent operation or failure
-* All capacitors should be replaced preventively
-* Use 105°C rated replacements
-=== Preventive Maintenance ===
+== Parts ==
+Selected entries, common to the LaserWriter II range except where the NT is named:<ref name="asg" />
-'''Service Intervals:'''
+{| class="wikitable styled-table" style="width:80%;"
-* '''Monthly:''' Clean corona wires with brush
+! Part !! Number
-* '''50,000 pages:''' General cleaning and inspection
+|-
-* '''100,000 pages:''' Replace transfer corona assembly
+| Controller-I/O board, LW II NT || 661-0438
-* '''200,000 pages:''' Replace fuser assembly
+|-
-* '''300,000 pages:''' Major overhaul recommended
+| DC controller PCA || 661-0426
+|-
-'''Regular Cleaning:'''
+| DC power supply, 110/115 V || 661-0424
-* Toner vacuum with appropriate filter
+|-
-* Paper path cleaning with lint-free cloth
+| DC power supply, 220/240 V || 661-0442
-* Corona wire cleaning with supplied brush
+|-
-* Exterior wipe with damp cloth
+| Fuse, 125 V 6.3 A || 941-0005
+|-
-=== Memory Issues ===
+| Fuse, medium time lag 3.15 A, 250 V || 740-0061
-The 2 MB fixed RAM configuration limitations:
+|-
-* Cannot be expanded
+| High-voltage power supply || 661-0425
-* Insufficient for very complex documents
+|-
-* May require document simplification
+| Laser/scanner assembly || 661-0423
-* Font downloading limited by available memory
+|-
+| Fuser assembly, 110/115 V || 661-0440
-== Driver Software ==
+|-
+| Fuser assembly, 220/240 V || 661-0444
-=== Macintosh Support ===
+|-
-* '''System 6.0.3:''' Minimum requirement
+| Fuser heater, 100 V, 620 W || 938-0003
-* '''System 7.0-7.5.5:''' Full support
+|-
-* '''LaserWriter driver:''' Version 5.2 or later
+| Fuser heater, 220 V, 570 W || 938-0004
-* '''Chooser extension:''' Standard AppleTalk
+|-
+| Fuser roller cleaner || 970-0049
-=== PC Support ===
+|-
-* '''MS-DOS:''' PostScript drivers available
+| Ozone filter || 961-0003
-* '''Windows 3.x:''' PostScript driver support
+|-
-* '''OS/2:''' Native PostScript support
+| Ozone filter (for case with door) || 961-0007
-* '''Connection:''' RS-232 serial cable
+|-
+| Power supply block, 110/115 V || 661-0427
-=== Printer Languages ===
+|-
-* '''PostScript Level 1:''' Primary language
+| Power supply block, 220/240 V || 661-0443
-* '''Diablo 630:''' Emulation mode for compatibility
+|-
-* '''HP LaserJet:''' Not supported (unlike IINTX)
+| Distribution PCA || 971-0028
+|-
-== Service Information ==
+| Transfer corona assembly || 971-0026
-=== DIP Switch Settings ===
-Internal DIP switches for configuration:
-* '''SW1-2:''' Interface selection (LocalTalk/Serial)
-* '''SW3:''' Diablo 630 emulation
-* '''SW4:''' Reserved
-* '''SW5-8:''' Diagnostic modes
-=== Test Points ===
-DC controller board test points:
-* +5V DC logic supply
-* +24V DC motor supply
-* -12V DC bias supply
-* High voltage (special probe required)
-=== Voltage Adjustments ===
-* Print density: Potentiometer on DC controller
-* Registration: Mechanical laser alignment
-* No user-adjustable voltages
-== Upgrade Options ==
-=== Controller Board Upgrades ===
-The IINT could be upgraded to:
-* '''IIf board:''' PostScript Level 2, SCSI support
-* '''IIg board:''' PostScript Level 2, Ethernet
-'''Upgrade Process:'''
-# Remove IINT controller board
-# Install replacement board
-# Update printer drivers
-# Configure new features
-=== Comparison with Downgrade ===
-The IINT could replace IISC controller for PostScript:
-* Adds PostScript Level 1
-* Adds LocalTalk networking
-* Adds 35 built-in fonts
-* Increases processor speed
-== Comparison with LaserWriter II Series ==
-{| class="wikitable" style="width:95%; text-align:center;"
-|+'''LaserWriter II Series Specifications'''
-! Feature !! IISC !! IINT !! IINTX !! IIf !! IIg
 |-
-| Processor || 68000 @ 7.45 MHz || 68000 @ 11.5 MHz || 68020 @ 16.67 MHz || 68030 @ 25 MHz || 68030 @ 25 MHz
+| Transfer guide assembly || 971-0019
 |-
-| RAM || 1 MB fixed || 2 MB fixed || 2-12 MB || 2-32 MB || 5-32 MB
+| Paper feed roller assembly || 971-0017
 |-
-| PostScript || No || Level 1 || Level 1 || Level 2 || Level 2
+| Feeder assembly || 971-0018
 |-
-| Fonts in ROM || 0 || 35 || 35 || 35 || 35
+| Delivery assembly || 971-0023
 |-
-| LocalTalk || No || Yes || Yes || Yes || Yes
+| Main motor assembly || 971-0014
 |-
-| SCSI || Yes || No || Yes || Yes || Yes
+| Fan, lower || 959-0021
 |-
-| Ethernet || No || No || No || No || Yes
+| Fan, upper || 959-0022
 |-
-| HP PCL || No || No || Yes || Yes || Yes
+| Status panel || 971-0005
 |-
-| Price (1988) || $2,999 || $4,599 || $5,999 || - || -
+| Cleaning brush || 970-0047
 |-
-| Price (1991) || - || - || - || $3,599 || $4,599
+| Mirror assembly || 971-0007
 |}
-== Compatibility ==
+The DC power supply, fuser assembly, fuser heater and power supply block are different parts for 110 V and 220 V machines, and the two fuser heaters are rated 620 W at 100 V and 570 W at 220 V.<ref name="asg" />
-=== System Requirements ===
-'''Macintosh:'''
-* System 6.0.3 or later
-* LaserWriter driver 5.2 or later
-* LocalTalk or serial connection
-'''Apple II:'''
-* Apple IIgs with AppleTalk card
-* Apple IIe with Workstation Card
-'''PC:'''
-* PostScript-aware application
-* RS-232 serial port
-* Appropriate driver software
-=== Network Compatibility ===
-* AppleTalk Phase 1 and Phase 2
-* LocalTalk compatible
-* PhoneNET compatible
-* EtherTalk bridge compatible
-== Service Manual ==
-<pdf width="800" height="500">File:LaserWriter_II_Service.pdf</pdf>
-The LaserWriter II series service manual is available on the [[:Category:Apple Service Source|Apple Service Source]] page.
-== Successor Models ==
+== Service manuals ==
+<pdf>File:Apple LaserWriter Printers Volume I.pdf</pdf>
-=== Personal LaserWriter NT ===
+<pdf>File:Apple LaserWriter II Service Training Participant Manual Version 1.1 Oct 1992.pdf</pdf>
-Released July 1990 as lower-cost alternative:
-* Reduced to 2 MB RAM (non-expandable)
-* Smaller footprint
-* Lower price point
-* Same 68000 processor
-=== LaserWriter IIf ===
+== Related pages ==
-Released October 1991 as direct replacement:
+* [[Apple LaserWriter II SC]]
-* 68030 processor at 25 MHz
+* [[Apple LaserWriter]]
-* PostScript Level 2
+* [[Apple LaserWriter Plus]]
-* 2-32 MB RAM expandable
+* [[Apple Personal LaserWriter 300]]
-* SCSI interface added
+* [[LaserWriter II Service Source]]
-* PhotoGrade and FinePrint options
-== Related Pages ==
+== References ==
-* [[LaserWriter IISC]]
+<references />
-* [[LaserWriter IINTX]]
-* [[LaserWriter IIf]]
-* [[LaserWriter IIg]]
-* [[LocalTalk]]
-* [[PostScript]]
-{{Navbox-AppleVintageAccessories}}
+{{Navbox-AppleVintageAccessories|state=collapsed}}
 [[Category:Apple Vintage Accessories]]

Apple LaserWriter II NT: Difference between revisions

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