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Macintosh 21 Color Display Service Source

From RetroTechCollection

The Macintosh 21" Color Display volume of Apple's Service Source is a 191-page service manual for Apple's 21-inch colour display. The PDF's creation date is 20 December 1995.[1]

Specifications

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Macintosh 21" Color Display specifications[2]
Item Value
Picture tube 21 in diagonal, 20 in viewable; 90° deflection; black-matrix dot screen, 0.26 × 0.29 mm dot pitch; P22 phosphor; flat, square grey filter glass, anti-static coating
Resolution 1152 × 870, 79 dpi; up to 256 colours with the Macintosh Display Card 8•24 or 8•24GC
Scan rates Vertical 75 Hz; horizontal 68.7 kHz; rise and fall time 5 ns maximum
Active display area 14.6 × 11.0 in (371 × 280 mm)
Controls and ports Brightness and contrast on the front; power and manual degauss switches on the back; three ADB ports; automatic degauss whenever the stand is tilted or swivelled
Power supply Universal, 85-135 and 170-270 V AC self-configuring, 47-63 Hz, 165 W maximum
Size and weight 18.5 in (470 mm) high, 19.6 in (498 mm) wide, 20.9 in (530 mm) deep; 79.6 lb (36.2 kg)
Operating environment 10-35 °C; 95% RH maximum, non-condensing; up to 10,000 ft

Contents

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  • Basics (PDF pp. 3-11): monitor distortion, troubleshooting LEDs
  • Specifications (PDF pp. 13-18)
  • Troubleshooting (PDF pp. 20-40): symptom charts for no raster, geometry, synchronisation, geometric alignment, convergence alignment, video and miscellaneous faults; troubleshooting-LED flowcharts
  • Take Apart (PDF pp. 42-110): monitor stand, internal ADB cable, rear cover, EMI shields, position sensor board, flyback transformer assembly, main board, magnetometer degauss board, power supply board, on/off switch, video assembly, video filter boards, bezel, contrast/brightness and LED, magnetometer coils, degauss coils, CRT (international only)
  • Additional Procedures (PDF pp. 112-115): Rev A/B compatibility
  • Adjustments (PDF pp. 117-189): aligning to magnetic north/south, geometry set-up, horizontal and vertical, convergence, focus, checking display video, video, light meter set-up
  • Exploded View (PDF pp. 190-191)

What it settles

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For a no-raster fault Apple uses six LEDs that are normally lit: V125 (horizontal and vertical sweep) and V810 (high voltage) on the main board, and V683, V684, V685 and V699 on the power supply board. The flowchart replaces the main board if V125 is out and the flyback transformer assembly if V810 is out. If the supply-board LEDs are off or flashing, the fuse on the on/off switch assembly is checked, then ribbon cables are unplugged in turn (X105 on the main board, X303 on the video board, X855 on the magnetometer degauss board) to find the module that pulls the supply down.[3]

Rev A CRTs need Rev A main boards and Rev B CRTs need Rev B main boards. A Rev B CRT has a small blue label reading "NEW" near the anode; a Rev B main board has capacitor C153, on either side of the board, and a Rev B board is converted to Rev A by removing C153.[4]

The degaussing circuitry and magnetometer make alignment sensitive to direction: before adjusting, Apple has the monitor placed facing magnetic north or south, at least three feet from metal objects, using a compass on the bezel. As on the 16-inch display, Apple says to rule out environmental distortion before swapping modules or adjusting.[5]

The miscellaneous symptom chart records that a Power Macintosh 9600 with an Apple/IMS video card can show jitter or a wavy image at 1152 × 870 on any display; cards with serial numbers below Fx705xxx should be replaced with part 661-1409. On domestic units a suspected CRT failure is to be confirmed with Apple Technical Support; only international units have a CRT take-apart procedure.[6]

The exploded view gives Apple part numbers, among them CRT assembly 076-0394, main board assembly 661-0656, power supply board 661-0658, video assembly 661-0655, flyback transformer assembly 661-1132, magnetometer degauss board 661-0657, position sensor board 982-0096, magnetometer coils 076-0403, degauss coils 076-0405, video filter board 076-0404 and on/off switch filter assembly 076-0398.[7]

What this manual does not contain

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There is no schematic, no component values, no fuse rating, no supply-rail tolerance and no high-voltage figure; the flyback and the power supply board are replaced as modules.[1]

Pages that cite this document

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The Take Apart procedures begin with discharging the CRT; see CRT Discharge Procedure.[1]

Download: 21 color display.pdf

References

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  1. ↑ 1.0 1.1 1.2 Apple Computer, Inc., Macintosh 21-inch Color Display (Service Source), 191 pp. Hosted as File:21 color display.pdf.
  2. ↑ Macintosh 21-inch Color Display Service Source, Specifications, pp. 1-6 (PDF pp. 13-18).
  3. ↑ Macintosh 21-inch Color Display Service Source, Basics, Troubleshooting LEDs, pp. 7-9 (PDF pp. 9-11), and Troubleshooting, Troubleshooting LEDs, pp. 19-21 (PDF pp. 38-40).
  4. ↑ Macintosh 21-inch Color Display Service Source, Additional Procedures, Rev A/B Compatibility, pp. 1-4 (PDF pp. 112-115).
  5. ↑ Macintosh 21-inch Color Display Service Source, Basics, Monitor Distortion, pp. 1-6 (PDF pp. 3-8), and Adjustments, Aligning to Magnetic N/S, pp. 1-2 (PDF pp. 117-118).
  6. ↑ Macintosh 21-inch Color Display Service Source, Troubleshooting, Symptom Charts, pp. 16-18 (PDF pp. 35-37).
  7. ↑ Macintosh 21-inch Color Display Service Source, Exploded View (PDF p. 191).
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