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Apple Multiple Scan 1705 Display

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Apple Multiple Scan 1705 Display
Apple Multiple Scan 1705 Display (Service Source)
Apple's photograph from the Service Source
Manufacturer Apple Computer
Type 17-inch multiple-scan colour monitor
Interface 15-pin miniature D-type, RGB with separate sync; Macintosh-to-VGA adapter supplied
Model M4434LL/A
Power Universal 90-264 V AC, 47-63 Hz; 100 W maximum

The Apple Multiple Scan 1705 Display (M4434LL/A) is a low-cost 17-inch shadow-mask colour monitor with a 15.8-inch viewable image. Apple supplied it with a Macintosh-to-VGA adapter so it could also be used with IBM PC-compatible computers with VGA or better graphics.[1] Apple's October 1995 Apple Facts marks it as a new product and calls it Apple's most affordable full-page colour display.[2] Apple's data sheet for it is dated October 1995.[3]

The anode runs at 25 kV.[4] Read CRT Discharge Procedure before opening the case.

Specifications

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Apple Multiple Scan 1705 Display specifications[1]
Item Value
Picture tube 17 in FST, 15.8 in viewable; in-line gun; 29.1 mm neck; P22 phosphor; 0.28 mm dot pitch
Resolutions 720 × 400 at 70 Hz and 640 × 480 at 60 Hz (VGA); 640 × 480 at 70 Hz (VESA); 800 × 600 at 72 Hz; 1024 × 768 at 70 Hz; 1280 × 1024 at 60 and 84 Hz; further VESA modes at 60 and 75 Hz
Scan rates Vertical 47-120 Hz; horizontal 31-65 kHz
Video bandwidth 111.5 MHz
Controls Behind a flip-down door: brightness and contrast knobs, degauss, select, up and down buttons; power button to the right
Mains Universal, 90-264 V AC, 47-63 Hz
Power 100 W maximum
Size 437 mm high, 420 mm wide, 479 mm deep
Weight 20.5 kg (45 lb)

Controls

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The display stores the user's picture settings in its own memory and restores them at power-on. Hold SELECT until the indicator lights for the setting wanted (horizontal centre, width, vertical centre, height, picture curvature, side alignment), then use DOWN and UP. DEGAUSS degausses the tube. Pressing DOWN and UP together restores the factory settings. The indicator light goes out 10 seconds after the last adjustment, by design.[5][6]

Hardware

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The video board and main deflection board come out together with the rear fence, and Apple treats them as one module because they cannot be separated without risk to the CRT connector. Connectors P302, P702 and P703 are stiff: release their tabs with a small screwdriver first.[7] Internal controls include high voltage (VR501), horizontal raster centre (VR701), focus (VR F1 and F2 on the flyback), screen, sub-contrast (VR704), ABL (VR703), sub-brightness (VR305), red and green drive (VR302, VR301) and red and green bias (VR303, VR304).[8]

Known faults

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Apple's symptom charts and its no-raster flowchart lead through the cable, the computer's video, the high voltage and a 6 V check at CRT socket pin H before replacing the main deflection and video boards. See Apple Multiple Scan 1705 Display Troubleshooting Guide.

Apple's service documents give no schematic, parts list or component values for this display.

Documentation

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References

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  1. ↑ 1.0 1.1 Apple Computer, Apple Multiple Scan 1705 Display (Service Source), 165 pp., Basics, pp. 1-5 (PDF pp. 3-7), and Specifications (PDF pp. 9-17). Hosted here: File:Multiple scan 1705 display.pdf (see Apple Multiple Scan 1705 Service Source).
  2. ↑ Apple Computer, Apple Facts 10.95, October 1995, product index (p. 138, marked as new) and Apple Multiple Scan 1705 Display entry. archive.org scan.
  3. ↑ Apple Computer, Apple Multiple Scan 1705 Display data sheet, October 1995, L01534A. Hosted here: File:Apple Multiple Scan 1705 Display Data Sheet 1995.pdf.
  4. ↑ Apple Multiple Scan 1705 Display Service Source, Troubleshooting, Checking High Voltage, pp. 14-15 (PDF pp. 32-33).
  5. ↑ Apple Multiple Scan 1705 Display Service Source, Adjustments, User Adjustments, pp. 1-11 (PDF pp. 115-125).
  6. ↑ Apple Multiple Scan 1705 Display Service Source, Troubleshooting, Symptom Charts/Miscellaneous, p. 13 (PDF p. 31).
  7. ↑ Apple Multiple Scan 1705 Display Service Source, Basics, Troubleshooting and Repair Tips and Special Tools, pp. 3-5 (PDF pp. 5-7).
  8. ↑ Apple Multiple Scan 1705 Display Service Source, Adjustments, Non User Adjustments, pp. 12-49 (PDF pp. 126-163).


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