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Apple Multiple Scan 17 Service Source

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Revision as of 14:22, 30 September 2026 by Josh (talk | contribs) (Correct EEPROM consequence (lost settings = display cannot be repaired, per Apple; not a realignment); cite damper-wire note to the manual; add microprocessor board revision check and CRT shutdown test; page-cited refs; remove bold)
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The Apple Multiple Scan 17 Display volume of Apple's Service Source is a 101-page service manual for the Multiple Scan 17, a 17-inch Trinitron colour display with ADB and sound ports in its stand. The PDF was distilled on 21 December 1995.[1]

Specifications as printed

Apple Multiple Scan 17 specifications[2]
Item Value
Picture tube 17 in diagonal Trinitron, 16.1 in viewable; bonded glass panel with antiglare/antistatic multilayer coating; 0.26 mm stripe pitch
Screen resolution 640 × 480, 800 × 600, 832 × 624, 1024 × 768
Scan rates Vertical 50-150 Hz; horizontal 29-82 kHz; Macintosh, XGA, VGA, SVGA and VESA compatible
Video input RGB analogue RS-343A, 0.714 V p-p positive-going; sync on green 0.286 V ±10%; separate or composite sync 1-5 V p-p, either polarity
Controls Front: power, reset, control buttons, brightness, contrast; command button for shift, size, rotation, convergence and colour temperature
Mains Universal, 90-132 and 198-260 VAC self-configuring, 47-63 Hz
Power 150 W maximum
Size and weight 424 mm H × 405 mm W × 452.3 mm D; 22.5 kg (50.0 lb)
Ports Three ADB ports in the stand (two front, one rear); microphone input and speaker/headphone output at the front; sound-in and sound-out at the rear

EEPROM settings

Each Multiple Scan 17 has an EEPROM on the microprocessor board holding adjustment information specific to that display. Before replacing the microprocessor board, save the EEPROM with the MacTest Pro Display Setting Restore Utility over a mini-DIN-8 serial cable ("Create File"), fit the new board, then write the file back ("Write File"). A new board's default settings leave the display readable only with difficulty. Apple warns that if the settings are lost before they are written to the new EEPROM, the display cannot be repaired and must be replaced, and that a saved file must only be written back to the display it came from.[3]

Diagnostic notes from the manual

  • The two thin horizontal lines about a quarter to a third of the way from the top and bottom of the picture are the support wires of the Trinitron aperture grille. They are not a defect and cannot be removed by repair.[4]
  • An oversized raster that the adjustments do not affect points to an early microprocessor board. On the component side, a nine-digit number ending -12 with a white mark, or -13 without one, is an updated board; -11, or -12 without a white mark, needs replacing (after saving the EEPROM).[4]
  • Colour blotches at the edges of a white screen and vertical jitter are usually caused by magnetic fields or interference in the surroundings; Apple's first step is to degauss and move the display.[4]
  • A display that shuts down shortly after power-up: with the rear cover and EMI shield off and the CRT discharged, pull the CRT/video board straight off the tube neck onto an insulating sheet and power up. If the power light stays on, the CRT is defective; if the display still shuts down, replace the main deflection board.[5]

Contents

  • Basics: EEPROM Settings (PDF pp. 3-4)
  • Specifications: Characteristics, Controls and Ports, Physical and Electrical, Environmental (PDF pp. 6-11)
  • Troubleshooting: General, First Checklist, Display Setting Restoration, CRT, Symptom Charts for Raster, Power, Indicator Lights and Miscellaneous (PDF pp. 13-32)
  • Take Apart: Monitor Stand, Monitor Stand Cables, Rear Cover, EMI Shield, CRT/Video Board, Video Cable, Serial I/O Board, AC Inlet, Microprocessor Board, Main Deflection Board, Control Panel Board (PDF pp. 34-77)
  • Adjustments: Brightness and Contrast, Geometry, Convergence, Color Temperature, Factory Settings (PDF pp. 79-99)
  • Exploded View (PDF p. 101)

What this manual does not contain

No parts list, schematic, component values or fuse rating, and no high-voltage figure. Repairs are board exchanges.[1]

Download: Multiple scan 17 display.pdf

References

  1. ↑ 1.0 1.1 Apple Computer, Apple Multiple Scan 17 Display (Service Source), 101 pp., 1995. Hosted as File:Multiple scan 17 display.pdf.
  2. ↑ Apple Multiple Scan 17 Display Service Source, Specifications: Characteristics pp. 1-2, Controls and Ports p. 3, Physical and Electrical pp. 4-5, Environmental p. 6 (PDF pp. 6-11).
  3. ↑ Apple Multiple Scan 17 Display Service Source, Basics, "EEPROM Settings" p. 1 (PDF p. 3), and Troubleshooting, "Display Setting Restoration" pp. 5-9 (PDF pp. 17-21).
  4. ↑ 4.0 4.1 4.2 Apple Multiple Scan 17 Display Service Source, Troubleshooting: Symptom Charts/Raster p. 13, Power p. 14, Miscellaneous pp. 19-20 (PDF pp. 25-26, 31-32).
  5. ↑ Apple Multiple Scan 17 Display Service Source, Troubleshooting, "CRT" pp. 10-11 (PDF pp. 22-23).
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