User`s guide

Troubleshooting Adjusting the Display after Replacing the Main Deflection Board/
Adjusting the Display after Replacing the
Main Deflection Board
After replacing the main deflection board, perform the following
adjustments for all three Macintosh modes (screen resolutions):
• 640x480 at 67 Hz
• 832x624 at 75 Hz
• 1024x768 at 75 Hz
1 Using the control strip (or the Monitors control panel),
select 1024x768, the highest of the three Macintosh screen
resolutions.
2 Open the Display Service Utility (DSU) and select Pattern
Selections: AppleVision 1710/1710AV.
3 Refer to the procedure called “Checking High Voltage” in this
chapter to verify that the high voltage is 26 kV. If the high
voltage is not 26 kV, adjust the high voltage using the DSU,
the multimeter, and the high-voltage probe. Use the high
voltage slider control on the DSU to make final adjustments.
4 Using the DSU, select the focus pattern (percent signs).
Adjust horizontal and vertical focus controls for best center-
of-screen performance. If necessary, readjust each focus
control to optimize overall focus.
Screen
Resolutions
V Focus H Focus