Apple Multiple Scan 20 Service Source
The Apple Multiple Scan 20 Display volume of Apple's Service Source is a 122-page service manual covering the Multiple Scan 20, a 20-inch Trinitron colour display, and its Rev. B version. The PDF was distilled on 21 December 1995.[1]
Specifications as printed
[edit | edit source]| Item | Value |
|---|---|
| Picture tube | 20 in diagonal Trinitron, 19.1 in viewable; bonded glass panel with antiglare/antistatic multilayer coating |
| Stripe pitch | 0.31 mm; 0.26 mm on the Rev. B |
| Screen resolution | 640 × 480 to 1280 × 1024 |
| Scan rates | Vertical 50-150 Hz; horizontal 29-82 kHz |
| Video input | RGB analogue RS-343A, 0.714 V p-p; sync on green 0.286 V ±10%; separate or composite sync 1-5 V p-p |
| Mains | Universal, 90-132 and 198-264 VAC self-configuring, 47-63 Hz |
| Power | 165 W maximum; under 15 W in energy-saver mode |
| Size | 474 mm H × 474 mm W × 501.5 mm D |
| Weight | 30 kg (66 lb); 36 kg (80 lb) boxed |
| Stand | Tilt −5 to +15°, swivel ±45°; three ADB ports (two front, one rear) |
Rev. B
[edit | edit source]The two versions look the same. Apple identifies the Rev. B by the last three characters of the serial number: 5B4, 5J2, 5JE or 5JF. The Rev. B has the 0.26 mm stripe pitch and needs Rev. B parts for the main deflection board, the microprocessor controller board and the power supply.[3]
Service notes from the manual
[edit | edit source]- Apple's Basics chapter warns that large screens are easily distorted by their surroundings: metal furniture, fluorescent lights, other monitors and appliances. Move or swivel the display, or check it in another building, before adjusting or exchanging it; exchanging the monitor cannot cure environmental distortion.[4]
- As on the Multiple Scan 17, the display's adjustment data is held in an EEPROM on the microprocessor board. Save it with the MacTest Pro Display Setting Restore Utility before replacing that board and write it back afterwards.[5]
- The fuse is on the power supply. Apple's replacement note says only to fit a fuse of the same current and voltage rating; the rating itself is not printed. Do not wear a wrist strap until the CRT has been discharged.[6]
Contents
[edit | edit source]- Basics: Version Differences, Monitor Distortion, EEPROM Settings (PDF pp. 3-13)
- Specifications: Characteristics, Controls and Ports, Physical and Electrical, Environmental (PDF pp. 15-20)
- Troubleshooting: General, First Checklist, Display Setting Restoration, Symptom Charts for Raster, Power, Indicator Lights and Miscellaneous (PDF pp. 22-41)
- Take Apart: Rear Cover, Bezel, EMI Shield, CRT/Video Board, Power Supply, Fuse, Focus VR Control, AC Inlet Assembly, Serial I/O Board, Video Cable, Main Deflection Board, Microprocessor Board, Tilt/Swivel Assembly, Control Panel, ADB Board (PDF pp. 43-97)
- Adjustments: Brightness and Contrast, Geometry, Convergence, Color Temperature, Factory Settings (PDF pp. 99-120)
- Exploded View (PDF p. 122)
What this manual does not contain
[edit | edit source]No parts list, schematic or component values, no fuse rating and no high-voltage figure.[1]
Related pages
[edit | edit source]
Download: Multiple scan 20 display.pdf
References
[edit | edit source]- ↑ 1.0 1.1 Apple Computer, Apple Multiple Scan 20 Display (Service Source), 122 pp., 1995. Hosted as File:Multiple scan 20 display.pdf.
- ↑ Apple Multiple Scan 20 Display Service Source, Specifications: Characteristics pp. 1-2, Physical and Electrical pp. 4-5 (PDF pp. 15-16, 18-19).
- ↑ Apple Multiple Scan 20 Display Service Source, Basics, "Version Differences" pp. 2-3 (PDF pp. 3-4).
- ↑ Apple Multiple Scan 20 Display Service Source, Basics, "Monitor Distortion" pp. 4-10 (PDF pp. 5-11).
- ↑ Apple Multiple Scan 20 Display Service Source, Basics, "EEPROM Settings" (PDF pp. 12-13), and Troubleshooting, "Display Setting Restoration" (PDF pp. 26-30).
- ↑ Apple Multiple Scan 20 Display Service Source, Take Apart, "Fuse" pp. 21-22 (PDF pp. 63-64).