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Apple AppleVision 1710 Display General Maintenance

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Care and adjustment of the AppleVision 1710 and AppleVision 1710AV. The two share their main deflection board, CRT/video board and adjustment procedures; the 1710AV adds a sound enclosure.[1] Day-to-day adjustment is done in software; the few hand adjustments inside the cabinet are made with the display running.

Exploded view of the AppleVision 1710 and 1710AV with part numbers (Apple Service Source)

Safety

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The CRT anode runs at 26 kV.[2] Follow the CRT Discharge Procedure before reaching inside. Apple's rules for live work: do not work alone, remove jewellery, wear safety goggles, keep one hand behind your back, never use a grounding wrist strap or grounded mat while discharging the CRT or adjusting a live display, and leave a clip lead from the bezel to the anode aperture after discharging, because the anode can recover some charge.[3]

Software adjustments

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On a Macintosh with the AppleVision (later Apple Display) software installed, the display runs in Remote mode and is adjusted from the AppleVision Setup or Monitors & Sound control panel: geometry (height, width, position, pincushion and rotation), convergence, colour and white point, and on the 1710AV the sound settings. Pressing any of the five buttons at the top left of the front panel opens the control panel. On a PC the same buttons drive an on-screen menu.[4][5] The Factory Settings button in the Geometry section restores the factory geometry; holding Option while clicking it is part of Apple's procedure after a board change.[6]

Apple asks for a 20-minute warm-up before any adjustment, and Apple Display software 1.5.3 or later.[6]

Recalibrating the white point

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Select the 9300 K white point in the Color section and click Recalibrate. Choosing another white point (6500 K or D50) needs another recalibration. If recalibration fails, click Recalibrate again; Apple's procedure allows up to four attempts, reloading the saved set-up file between them, before referring the display for repair. If the picture looks soft after recalibrating, reset convergence.[6]

Hand adjustments

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Only three controls inside the cabinet are adjusted by hand.[6]

Hand adjustments (Service Source, Troubleshooting pp. 7-8 and 13)[6]
Control Where Use
H focus and V focus On the flyback transformer; use a plastic tool Best centre focus on the Display Service Utility focus pattern (percent signs), then the best overall focus
H-Stat Lower left side of the CRT/video board; standard hex tool Centre of the screen still blurred after focus and convergence
Top and bottom convergence Back of the CRT/video board (PS4 and PS3 in Apple's 1996 service guide); plastic tool Centre good but top or bottom blurred

Set convergence in software before touching focus, because poor convergence looks like poor focus. If the picture stays soft, one of the red or white wires in the CRT socket may not be secured; Apple's take-apart chapter shows how they are fitted.[6][7]

Degaussing

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The display degausses automatically at power-on. For a full degauss, switch it off for at least 20 minutes and then on again.[8] For bands of colour across the screen, Apple's chart suggests a hand-held degaussing coil before any board is replaced.[6]

High voltage

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Apple says to use only its high-voltage probe (076-0392) for this check; other probes do not give accurate readings.[2]

  1. Switch off the computer and display, unplug the power and video/ADB cables and wait at least two minutes.
  2. Remove the microphone or blank plate and the sound enclosure (1710AV), and the rear housing.
  3. Attach the probe to the meter and its ground lead securely to the chassis. Slide the probe under the anode cap from the rear of the CRT, away from the CRT frame.
  4. Reconnect the cables and switch on. The meter should read 26 V DC, which is 26 kV. A reading of 0 V means the main deflection board.
  5. Switch off and unplug before taking the probe out.[2]

The 1996 service guide gives the tolerance as 26 kV ± 1 kV.[9] After a main deflection board is replaced, Apple sets 26 kV with the Display Service Utility's high-voltage slider while reading the probe, then sets focus, at 1024 × 768 first and then at 640 × 480 and 832 × 624. Geometry changes in the utility need the jumper from kit 076-0529 fitted to BV1 on the CRT/video board, with the display switched off before the jumper is removed.[6]

Saving the set-up data

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The display's set-up parameters live on the CRT/video board. Before that board is replaced:

  1. With the power off, fit the jumper from kit 076-0529 to BV1, next to the BV2 ribbon cable on the right side of the CRT/video board.
  2. Run the Display Service Utility, select the AppleVision 1710/1710AV patterns and click Create File. After about three minutes a file called Parameter Settings 1710 appears beside the utility. Do not move or rename it; copy it into a backup folder.
  3. Fit the new board, move the jumper to it, and click Write File. The screen blinks two or three times during the three-minute upload.
  4. Switch off, remove the jumper, wait five seconds and switch on. Delete the AppleVision Preferences folder, restart, and Option-click Factory Settings in the Geometry section. Then adjust geometry (keystone with the utility), convergence and white point.[6]

Apple notes that CRT/video board replacement was not supported in every country.[6]

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References

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  1. ↑ Apple Computer, AppleVision 1710AV/1710 Display (Service Source), hosted as File:Applevision 1710av display.pdf. Exploded View (PDF p. 181).
  2. ↑ 2.0 2.1 2.2 AppleVision 1710AV/1710 Display Service Source, Troubleshooting, Checking High Voltage, p. 17 (PDF p. 50).
  3. ↑ Apple Computer, Macintosh Displays and Video Cards service guide, September 1996, hosted as File:Apple Macintosh Displays and Video Cards Service Guide (September 1996).pdf. Ten rules to CRT safety and discharging the CRT, pp. 2-3 (PDF pp. 20-21).
  4. ↑ Apple Computer, AppleVision 1710AV and 1710 Displays Developer Note, 1995, hosted as File:AppleVision 1710AV and 1710 Displays Developer Note (1995).pdf. Operating modes and front panel controls, pp. 5-8 (PDF pp. 17-20).
  5. ↑ AppleVision 1710AV/1710 Display Service Source, Adjustments, pp. 1-54 (PDF pp. 126-179).
  6. ↑ 6.00 6.01 6.02 6.03 6.04 6.05 6.06 6.07 6.08 6.09 AppleVision 1710AV/1710 Display Service Source, Troubleshooting, pp. 1-24 (PDF pp. 34-57).
  7. ↑ Macintosh Displays and Video Cards service guide (1996), AppleVision 1710 and 1710AV chapter, Figure 21, Troubleshooting Test Points, p. 89 (PDF p. 107).
  8. ↑ AppleVision 1710AV/1710 Display Service Source, Specifications, pp. 2-14 (PDF pp. 20-32).
  9. ↑ Macintosh Displays and Video Cards service guide (1996), AppleVision 1710 and 1710AV chapter, High-Voltage Check and No Video Flowchart, pp. 83-84 (PDF pp. 101-102).


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