User`s guide

Troubleshooting Diagnosing A Suspected Hardware Problem/Using the AppleVision
7 If a dialog box appears that says the Display Service Utility
(DSU) is unable to communicate with the display, then
remove the monitor housing, and use a multimeter to
measure the voltage between chassis ground and resistor RL1
on the end closest to capacitor CP17 on the main deflection
board:
• If the voltage measures 11.5 V to 12.5 V, replace the CRT/
video board
- If the problem is gone, adjust the display as described in
“Adjusting the Display after Replacing the CRT/Video
Board” in this chapter.
- If the problem persists, reassemble the monitor, and
return the display for whole unit or head unit
replacement (following the service strategy in your
region).
• If the voltage measures less than 11.5 V or greater than
12.5 V, replace the main deflection board (refer to the
Take Apart chapter). Reconnect the display to the computer
and turn on the computer and monitor.
- If the problem is gone, adjust the display as described in
“Adjusting the Display after Replacing the Main
Deflection Board” in this chapter.
- If the problem persists, reassemble the monitor, and
return the display for whole unit or head unit
replacement (following the service strategy in your
region).