Josh: /* Related Pages */

2026-02-11T15:03:43Z

← Older revision		Revision as of 16:03, 11 February 2026
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	== Related Pages ==		== Related Pages ==
	* [[Personal LaserWriter SC]]		* [[Apple Personal LaserWriter SC\|Personal LaserWriter SC]]
	* [[LaserWriter IINT]]		* [[Apple LaserWriter II NT\|LaserWriter IINT]]
	* [[LaserWriter IINTX]]		* [[Apple LaserWriter II NTX\|LaserWriter IINTX]]
	{{Navbox-AppleVintageAccessories}}		{{Navbox-AppleVintageAccessories}}

	[[Category:Apple Vintage Accessories]]		[[Category:Apple Vintage Accessories]]

Josh: /* Service Manual */

2025-09-14T17:31:16Z

Service Manual

← Older revision		Revision as of 18:31, 14 September 2025
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	== Service Manual ==		== Service Manual ==
	<pdf>File:~~Apple LaserWriter Printers Volume I~~.pdf</pdf>		<pdf> File:laserwriter_ii.pdf </pdf>

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

Josh: /* Processor and Memory */

2025-09-14T17:30:49Z

Processor and Memory

← Older revision		Revision as of 18:30, 14 September 2025
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	* '''ROM:''' 16 KB (minimal boot ROM only)		* '''ROM:''' 16 KB (minimal boot ROM only)
	* '''RAM:''' 1 MB total (fixed)		* '''RAM:''' 1 MB total (fixed)
	* No separate workspace RAM		** No separate workspace RAM
	* Frame buffer shared with system memory		** Frame buffer shared with system memory

	* '''RAM type:''' 120ns DRAM (4 × 256 KB chips)		* '''RAM type:''' 120ns DRAM (4 × 256 KB chips)
	* '''RAM slots:''' 4 (fully populated)		* '''RAM slots:''' 4 (fully populated)

Josh at 17:29, 14 September 2025

2025-09-14T17:29:04Z

← Older revision		Revision as of 18:29, 14 September 2025
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	{{Infobox computer peripheral		{{Infobox computer peripheral
	\| name = Apple LaserWriter IISC		\| name = Apple LaserWriter IISC
	\| image = [[File:~~Apple_LaserWriter_IISC~~.jpg\|250px]]		\| image = [[File:Apple_LaserWriter_II.jpg\|250px]]
	\| caption = Apple LaserWriter IISC (1988)		\| caption = Apple LaserWriter IISC (1988)
	\| manufacturer = Apple Computer, Inc.		\| manufacturer = Apple Computer, Inc.

Josh: Created page with "{{Infobox computer peripheral | name = Apple LaserWriter IISC | image = 250px | caption = Apple LaserWriter IISC (1988) | manufacturer = Apple Computer, Inc. | type = Laser printer | release date = January 1988 | discontinued = July 1, 1990 | price = US$2,999 (1988 retail) | interface = SCSI (dual ports), ADB | compatible = Macintosh with SCSI | dimensions = 8.7" H × 20.2" W × 18.7" D | weigh..."

2025-09-14T17:27:38Z

Created page with "{{Infobox computer peripheral | name = Apple LaserWriter IISC | image = 250px | caption = Apple LaserWriter IISC (1988) | manufacturer = Apple Computer, Inc. | type = Laser printer | release date = January 1988 | discontinued = July 1, 1990 | price = US$2,999 (1988 retail) | interface = SCSI (dual ports), ADB | compatible = Macintosh with SCSI | dimensions = 8.7" H × 20.2" W × 18.7" D | weigh..."

New page

{{Infobox computer peripheral
| name = Apple LaserWriter IISC
| image = [[File:Apple_LaserWriter_IISC.jpg|250px]]
| caption = Apple LaserWriter IISC (1988)
| manufacturer = Apple Computer, Inc.
| type = Laser printer
| release date = January 1988
| discontinued = July 1, 1990
| price = US$2,999 (1988 retail)
| interface = SCSI (dual ports), ADB
| compatible = Macintosh with SCSI
| dimensions = 8.7" H × 20.2" W × 18.7" D
| weight = 45 lbs (20.4 kg)
| power = 900W maximum, 90-126V/50-60Hz
| model = M6000
}}

The '''Apple LaserWriter IISC''' was an entry-level laser printer in the LaserWriter II series, released in January 1988 at US$2,999. Unlike other LaserWriter models, the IISC eliminated PostScript support and LocalTalk networking to reduce costs, instead using SCSI for connectivity and relying on the host Macintosh's QuickDraw to rasterize pages. The printer used a Canon LBP-SX print engine and featured a slower Motorola 68000 processor running at 7.45 MHz with only 1 MB of RAM. The IISC included dual SCSI ports for daisy-chaining and an ADB port for future expansion that was never utilized. The printer was discontinued in July 1990, replaced by the Personal LaserWriter SC.

== Technical Specifications ==

=== Physical Specifications ===
* '''Dimensions:''' 8.7" H × 20.2" W × 18.7" D (221 × 513 × 475 mm)
* '''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 ===
* '''Print speed:''' 8 pages per minute
* '''Resolution:''' 300 × 300 dpi
* '''First page out:''' Approximately 35 seconds
* '''Engine life:''' 300,000 pages rated
* '''Duty cycle:''' 3,000 pages per month recommended

=== Power Requirements ===
* '''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 ==

=== Processor and Memory ===
The LaserWriter IISC used significantly reduced processing power compared to PostScript models:

'''Central Processing Unit:'''
* '''CPU:''' Motorola MC68000
* '''Clock speed:''' 7.45 MHz (slowest in LaserWriter line)
* '''Data bus:''' 16-bit
* '''Address bus:''' 24-bit

'''Memory Configuration:'''
* '''ROM:''' 16 KB (minimal boot ROM only)
* '''RAM:''' 1 MB total (fixed)
* No separate workspace RAM
* Frame buffer shared with system memory
* '''RAM type:''' 120ns DRAM (4 × 256 KB chips)
* '''RAM slots:''' 4 (fully populated)
* '''Memory expansion:''' None possible

=== Controller Board Design ===
The IISC controller board was simplified compared to PostScript models:

* '''Page description:''' QuickDraw host-based rendering
* '''Font handling:''' No built-in fonts
* '''Graphics processing:''' Bitmap reception only
* '''SCSI controller:''' NCR 5380 or compatible
* '''Interface logic:''' Minimal glue logic

=== QuickDraw Printing ===
Unlike PostScript LaserWriters, the IISC relied entirely on the host Macintosh:

'''Printing Process:'''
# Macintosh renders page using QuickDraw
# Bitmap transmitted via SCSI
# Printer receives and prints bitmap directly
# No processing or interpretation in printer

'''Font Requirements:'''
* System 6: Adobe Type Manager (ATM) for scalable fonts
* System 7: TrueType fonts supported natively
* Bitmap fonts: Scaled by host, quality dependent on size

== Print Engine ==

=== Canon LBP-SX Engine ===
The IISC used the improved Canon LBP-SX engine, shared with all LaserWriter II models:

'''Engine Specifications:'''
* '''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

'''Improvements over LBP-CX:'''
* Reduced size and weight
* Improved paper handling
* Better reliability
* Quieter operation

=== Consumables ===
* '''Toner cartridge:''' Apple M6002 or HP 92295A
* '''Yield:''' Approximately 4,000 pages at 5% coverage
* '''Drum life:''' Integrated with toner cartridge
* '''OPC drum:''' Longer life than LBP-CX
* '''Paper tray:''' 250-sheet capacity letter/legal cassette
* '''Manual feed:''' Single-sheet bypass

== Interfaces ==

=== SCSI Interface ===
The IISC was unique among LaserWriters in using SCSI as its primary interface:

'''SCSI Specifications:'''
* '''Controller:''' NCR 5380 or compatible
* '''SCSI version:''' SCSI-1 asynchronous
* '''Transfer rate:''' Up to 5 MB/s theoretical (1-2 MB/s typical)
* '''Connectors:''' Two DB-25 female ports
* '''Termination:''' Internal termination when at chain end
* '''Cable length:''' Maximum 6 meters total chain

'''SCSI Configuration:'''
* '''SCSI ID:''' Set via DIP switches (0-6 usable)
* '''ID 7:''' Reserved for self-test mode
* '''Daisy-chaining:''' Supported via dual ports
* '''Parity:''' Not implemented

'''SCSI ID DIP Switch Settings:'''
{| class="wikitable" style="width:50%; text-align:center;"
! ID !! SW1 !! SW2 !! SW3 !! Function
|-
| 0 || OFF || OFF || OFF || Normal operation
|-
| 1 || ON || OFF || OFF || Normal operation
|-
| 2 || OFF || ON || OFF || Normal operation
|-
| 3 || ON || ON || OFF || Normal operation
|-
| 4 || OFF || OFF || ON || Normal operation
|-
| 5 || ON || OFF || ON || Normal operation
|-
| 6 || OFF || ON || ON || Normal operation
|-
| 7 || ON || ON || ON || Self-test mode
|}

=== ADB Port ===
The IISC included an Apple Desktop Bus port that was never utilized:

'''ADB Specifications:'''
* '''Connector:''' 4-pin mini-DIN
* '''Purpose:''' Reserved for future expansion
* '''Implementation:''' Non-functional in production units
* '''Planned uses:''' Unknown (possibly status display or control panel)

=== Missing Interfaces ===
Unlike other LaserWriter II models, the IISC lacked:
* LocalTalk/AppleTalk networking
* RS-232 serial port
* RS-422 serial port
* Ethernet (never available on any LaserWriter II)

== Paper Handling ==

=== Input Specifications ===
* '''Standard cassette:''' 250 sheets
* '''Manual feed:''' Single sheets
* '''Paper sizes:''' Letter, Legal, A4, Executive
* '''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
* '''Stacking:''' Sequential page order
* '''Duplex:''' Manual duplex only

== Diagnostic Features ==

=== Self-Test Mode ===
Setting SCSI ID to 7 activated self-test mode:
* Printer attempts to print test page on power-up
* Test page shows configuration and status
* No computer connection required
* Useful for troubleshooting hardware issues

=== Status Indicators ===
Front panel LEDs indicated printer status:
* '''Ready (green):''' Solid when ready to print
* '''Paper (amber):''' Paper out or jam
* '''Service (red):''' Service required
* '''Two red lights blinking:''' Common failure mode

=== Error Conditions ===
Common error states indicated by LED patterns:
* '''Continuous red blinking:''' Controller board failure
* '''Alternating amber/red:''' Print engine problem
* '''All lights on:''' Power supply issue
* '''No lights:''' Fuse blown or power supply dead

== Driver Software ==

=== Macintosh System Requirements ===
* '''Minimum OS:''' System 6.0.3
* '''Recommended:''' System 7.0 or later
* '''RAM:''' 2 MB minimum, 4 MB recommended
* '''SCSI:''' Built-in or expansion card

=== Driver Installation ===
The IISC required specific printer drivers:
* '''LaserWriter IISC driver:''' Included with printer
* '''Personal LaserWriter SC driver:''' Sometimes compatible
* '''Chooser extension:''' Required for printer selection
* '''Font support:''' ATM or TrueType required for quality output

=== Printing Process ===
# Select LaserWriter IISC in Chooser
# Application sends QuickDraw commands to driver
# Driver renders page to bitmap
# Bitmap compressed and sent via SCSI
# Printer receives and prints bitmap

== Common Issues and Maintenance ==

=== Known Problems ===

{| class="wikitable" style="width:90%; text-align:center;"
|+'''Common IISC Failures'''
! Component !! Symptoms !! Cause !! Repair
|-
| DC controller || Two red lights blinking || Capacitor failure || Recap board
|-
| Logic board || No communication || Bad capacitors (3 total) || Replace capacitors
|-
| SCSI termination || Intermittent connection || Termination issues || Check SCSI chain
|-
| Power supply || No power or cycling || Capacitor failure || Replace all electrolytics
|-
| Fuser assembly || Poor toner adhesion || Worn heating element || Replace fuser
|-
| Scanner motor || Horizontal lines || Motor failure || Replace motor assembly
|}

=== Capacitor Issues ===
The IISC logic board contained only three electrolytic capacitors, but failure was common:
* Symptoms: Two blinking red lights, no response
* All three capacitors should be replaced preventively
* Use 105°C rated replacements

=== SCSI Troubleshooting ===

'''Connection Issues:'''
* Verify unique SCSI ID (0-6)
* Check cable quality and length
* Ensure proper termination
* Test with printer as only SCSI device

'''Driver Problems:'''
* Reinstall printer driver
* Try Personal LaserWriter SC driver
* Check SCSI chain for conflicts
* Verify System software compatibility

=== Preventive Maintenance ===

'''Regular Service:'''
* '''Monthly:''' Clean corona wires
* '''50,000 pages:''' General cleaning and inspection
* '''100,000 pages:''' Replace transfer corona
* '''200,000 pages:''' Replace fuser assembly
* '''300,000 pages:''' Major overhaul

'''Cleaning Procedures:'''
* Use only toner-rated vacuum
* Clean paper path with lint-free cloth
* Wipe exterior with damp cloth
* Avoid liquid near electronics

== Upgrade Path ==

=== Controller Board Upgrades ===
The IISC could be upgraded to higher LaserWriter II models by replacing the controller board:

'''Available Upgrades:'''
* '''IINT board:''' Added PostScript and LocalTalk
* '''IINTX board:''' Added PostScript, LocalTalk, and SCSI font storage
* '''IIf board:''' Added PostScript Level 2 and SCSI
* '''IIg board:''' Added PostScript Level 2 and Ethernet

'''Upgrade Process:'''
# Remove IISC controller board
# Install replacement board
# Update printer drivers
# Configure for network if applicable

'''Cost Consideration:'''
Upgrade boards were expensive, often costing more than a used printer

== Service Information ==

=== DC Controller Settings ===
The DC controller board included service adjustments:
* '''Print density:''' Potentiometer adjustment
* '''Registration:''' Mechanical laser alignment
* '''Service button:''' Initiates test page

=== Test Points ===
* +5V DC digital logic
* +24V DC motor supply
* SCSI signal lines
* High voltage (requires special probe)

=== Service Mode ===
* Set SCSI ID to 7 for self-test
* Hold service button on DC controller for test page
* No other service modes available

== Comparison with LaserWriter II Models ==

{| class="wikitable" style="width:95%; text-align:center;"
|+'''LaserWriter II Series Comparison'''
! Feature !! IISC !! IINT !! IINTX !! IIf !! IIg
|-
| PostScript || No || Level 1 || Level 1 || Level 2 || Level 2
|-
| Processor || 68000 @ 7.45 MHz || 68000 @ 11.5 MHz || 68020 @ 16.67 MHz || 68030 @ 25 MHz || 68030 @ 25 MHz
|-
| RAM || 1 MB fixed || 2 MB min || 2-12 MB || 2-32 MB || 5-32 MB
|-
| LocalTalk || No || Yes || Yes || Yes || Yes
|-
| SCSI || Yes (2 ports) || No || Yes (font storage) || Yes || Yes
|-
| Ethernet || No || No || No || No || Yes
|-
| ADB || Yes (unused) || Yes (unused) || Yes (unused) || No || No
|-
| Price (1988) || $2,999 || $4,599 || $5,999 || $3,599 (1991) || $4,599 (1991)
|}

== Compatibility ==

=== System Requirements ===
* '''System 6.0.3 minimum:''' Basic printing support
* '''System 6.0.5 or later:''' Improved driver
* '''System 7.0:''' TrueType font support
* '''System 7.1:''' Best compatibility
* '''System 7.5.x:''' Fully supported

=== Compatible Macintosh Models ===
Any Macintosh with SCSI port:
* Macintosh Plus and later
* Macintosh SE, SE/30
* Macintosh II series
* Macintosh LC series (with SCSI)
* Macintosh Quadra series
* PowerBook models with SCSI

=== Software Compatibility ===
* Required QuickDraw-aware applications
* No PostScript support
* Limited graphics capabilities
* Best with word processors and simple layouts

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

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

== Related Pages ==
* [[Personal LaserWriter SC]]
* [[LaserWriter IINT]]
* [[LaserWriter IINTX]]
{{Navbox-AppleVintageAccessories}}

[[Category:Apple Vintage Accessories]]

Apple LaserWriter II SC - Revision history

Josh: /* Related Pages */

Josh: /* Service Manual */

Josh: /* Processor and Memory */

Josh at 17:29, 14 September 2025