Specifications

Troubleshooting Downloading Setup Parameters and Replacing the CRT/Video
will take about 3 minutes.
5 When the message disappears, a new file called Parameter
Settings 850 is created on the same level as the Display
Service Utility application.
Caution: To avoid loss of data, do not move or rename the
Parameter Settings 850 file.
Duplicate the Parameter Settings File
1 Locate the Parameter Settings 850 file, but do not move or
rename it.
2 Beside the Parameter Settings 850 file create a new folder.
3 Name the new folder Parameter File Backup.
4 Hold down the option key and drag the Parameter Settings
850 file onto the Parameter File Backup folder.
5 Shut down the monitor. Unplug the power cord.
Replace the CRT/Video Board
1 Remove the defective CRT/video board and replace it with a
new CRT/video board. Refer to the CRT/Video Board topic in
the Take Apart chapter.
2 Reattach the power cord. Restart the computer.
3 Open the Display Service Utility and select AppleVision 850/
850AV pattern selections.
Upload Parameter Settings
1 To upload parameter settings, use the Display Service Utility
and click Write File. A message appears explaining that the
process will take about 3 minutes. In this time the screen
will blink 2 to 3 times before the Parameter Settings 850
file is uploaded.
Note: If the Write File button is grayed out, this means the
application can’t find the Parameter Settings 850 file. Make
sure you did not move or rename the original file.
2 When the message disappears, quit the Display Service
Utility.
3 Turn off the monitor.
4 After about 5 seconds, turn on the monitor.
5 Drag the AppleVision Preferences file into the trash. Restart
the computer.
6 Open the Monitors & Sound control panel, and click the
Geometry button.
7 Hold down the option key and click Factory Settings.
8 Go to the next procedure: “Adjusting the Display after
Replacing the CRT/Video Board.”