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Correct "no fuse rating": manual gives 2.5 A and flags 1.6 A fuses fitted in error (serials 43661GXW-44718HQX); add 31 fL video targets, stand checks, phosphor, dot clock, environment; remove unsupported comparisons; page-cited refs
 
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The '''Apple Two-Page Monochrome Monitor''' volume of Apple's ''Service Source'' is a '''98-page''' service manual for Apple's 21-inch two-page monochrome monitor. The PDF was distilled on 6 December 1995.
The '''Apple Two-Page Monochrome Monitor''' volume of Apple's ''Service Source'' is a 98-page service manual for Apple's 21-inch two-page monochrome monitor. The PDF was distilled on 6 December 1995.<ref name="ss">Apple Computer, ''Apple Two-Page Monochrome Monitor'' (''Service Source''), 98 pp., 1995. Hosted as [[:File:Twopage monochrome monitor.pdf]].</ref>


== Specifications as printed ==
== Specifications as printed ==
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{| class="wikitable styled-table"
{| class="wikitable styled-table"
|+'''Apple Two-Page Monochrome Monitor specifications'''<ref name="spec">''Apple Two-Page Monochrome Monitor'' Service Source, Specifications: Characteristics pp. 2-3, Controls p. 4, Physical and Electrical p. 5, Operating Environment p. 6 (PDF pp. 11-15).</ref>
! Item !! Value
|-
| Picture tube || 21 in diagonal, 20 in viewable; P4 (white) phosphor; flat, square, antiglare
|-
| Screen resolution || 1,152 × 870, 77 dpi; up to 16 greys with 512K of video RAM
|-
| Scan rates || Vertical 75 Hz; horizontal 68.7 kHz; dot clock 100 MHz
|-
|-
! Item !! Value
| Active display area || 381 × 287 mm (15 × 11.3 in)
|-
|-
| Picture tube || 21 in diagonal, '''20 in viewable'''
| Input || Analogue video, RS-343
|-
|-
| Screen resolution || '''1,152 x 870''' lines, 77 dpi
| Controls || Power switch on the rear panel; brightness and contrast on the right side
|-
|-
| Scan rates || vertical refresh '''75 Hz'''; horizontal '''68.7 kHz'''
| Power supply || Universal, 90-270 VAC self-configuring, 47-63 Hz, 95 W maximum
|-
|-
| Power supply || universal, 90-270 VAC self-configuring, 47-63 Hz, '''95 W maximum'''
| Size and weight || 399 mm H (add 81 mm for the integrated stand) × 495 mm W × 442 mm D; 25 kg (55 lb)
|-
|-
| Size / weight || 15.7 in (399 mm) H, add 3.2 in (81 mm) for the integrated stand; 19.5 in (495 mm) W x 17.4 in (442 mm) D; 55 lb (25 kg)
| Operating environment || 10-35 °C; 90% humidity maximum, non-condensing; up to 3,048 m
|}
|}


It runs the same 1152 x 870 at 75 Hz / 68.7 kHz as the 21-inch colour display, so the two share a video timing but nothing else.
== Service notes from the manual ==
* Fuse: some units with serial numbers between 43661GXW and 44718HQX were fitted with a 1.6 A fuse on the power supply board. Apple says that value is incorrect and the correct fuse is 2.5 A.<ref name="fuse">''Apple Two-Page Monochrome Monitor'' Service Source, Take Apart, "Fuse" pp. 20-21 (PDF pp. 45-46).</ref>
* The Video adjustments set sub-contrast and brightness range to 31 foot-lamberts ±3 fL, measured with Apple's R77 (part 076-0310), L-248 or 246 light meter; the Light Meter Setup section gives the meter reading that corresponds to 31 fL on each model.<ref name="video">''Apple Two-Page Monochrome Monitor'' Service Source, Adjustments, "Video" pp. 16-26 and "Light Meter Setup" pp. 27-32 (PDF pp. 80-96).</ref>
* The Monitor Stand symptom chart covers a stand that will not swivel (check that the "Front" marks on the tilt/swivel mechanism and base line up, and that the snap lock assembly is in place) or will not tilt (check the plastic plug in the snap lock).<ref name="stand">''Apple Two-Page Monochrome Monitor'' Service Source, Troubleshooting, Symptom Charts/Monitor Stand p. 8 (PDF p. 24).</ref>
* The Basics chapter is about environmental distortion of the raster, to be ruled out before adjusting or exchanging the monitor.<ref name="ss" />


== Contents ==
== Contents ==
* '''Basics''' - Monitor Distortion (pdf pp. 3-9)
* Basics: Monitor Distortion (PDF pp. 3-9)
* '''Specifications''' - Characteristics, Controls, Physical and Electrical, Operating Environment (pdf pp. 11-15)
* Specifications: Characteristics, Controls, Physical and Electrical, Operating Environment (PDF pp. 11-15)
* '''Troubleshooting''' - General, symptom charts for No Raster, Geometry, Synchronization, Video, Miscellaneous and '''Monitor Stand''' (pdf pp. 17-24)
* Troubleshooting: General; Symptom Charts for No Raster, Geometry, Synchronization, Video, Miscellaneous and Monitor Stand (PDF pp. 17-24)
* '''Take Apart''' - Swivel Stand, Rear Cover, Access Cover, Video Board, Deflection Board, '''Power Supply''', '''Fuse''', On/Off Switch, Contrast/Brightness Assembly, Bezel, CRT, LED Assembly (pdf pp. 26-63)
* Take Apart: Swivel Stand, Rear Cover, Access Cover, Video Board, Deflection Board, Power Supply, Fuse, On/Off Switch, Contrast/Brightness Assembly, Bezel, CRT, LED Assembly (PDF pp. 26-63)
* '''Adjustments''' - Geometry, Video, Light Meter Setup (pdf pp. 65-96)
* Adjustments: Geometry, Video, Light Meter Setup (PDF pp. 65-96)
* '''Exploded View''' (pdf pp. 97-98)
* Exploded View (PDF p. 98)
 
A '''Monitor Stand''' symptom chart is unusual and reflects a real failure mode: the stand on this monitor is a serviceable mechanism in its own right.


== What this manual does not contain ==
== What this manual does not contain ==
No parts list, no schematic, no component values, no fuse rating and no rail tolerances.
No parts list, schematic, component values or power-supply rail figures.<ref name="ss" />
 
== Pages that cite this document ==
* [[Macintosh 21 Color Display Service Source]] - same video timing, different machine.


A CRT display holds a lethal charge on the anode after the mains is removed. Follow [[CRT Discharge Procedure]] before working inside one. Apple's own Take Apart chapters open with the same warning.
== Related pages ==
* [[Macintosh 21 Color Display Service Source]]
* [[Macintosh Portrait Display Service Source]]
* [[CRT Discharge Procedure]]: Apple's Take Apart procedures start by discharging the CRT.


<pdf> File:Twopage monochrome monitor.pdf </pdf>
<pdf> File:Twopage monochrome monitor.pdf </pdf>


Download: [[:File:Twopage monochrome monitor.pdf|Twopage monochrome monitor.pdf]]
Download: [[:File:Twopage monochrome monitor.pdf|Twopage monochrome monitor.pdf]]
== References ==
<references />


[[Category:Service Manuals]]
[[Category:Service Manuals]]
[[Category:Apple Vintage Computers]]
[[Category:Apple Vintage Computers]]
[[Category:Apple Service Source]]
[[Category:Apple Service Source]]
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