Xerox 8830 Service Manual page 398

1.2 BLANK DISPLAY RAP
This RAP is to be followed to determine the cause of the 8830 DDS Control Panel having a
blank display, and to rectify the problem.
Initial Actions
Perform the following:
• Ensure that all cables and connectors are correctly hooked up between the 7356 Scanner
and the 8830 Controller. (Refer to the 8830 DDS Installation Procedure.)
• Ensure that all elements of the system are plugged in to a reliable power supply.
• Reboot the 8830 DDS system by powering off ali elements and rebooting them in the fol-
lowing order: 7356 Scanner, 8830 Controller, 8830 Printer.
Procedure
Remove the two hex screws securing the cover of the 8830 Controller and ensure that the
LEDs located on the 8830 Controller Main PWB are lit and cycle on and off. This Indicates that
the Controller is operational. The LEDs on the 8830 Controller are lit and cycle on and off.
Y N
Check the 8830 Printer Display Panel for a fault code and troubleshoot the problem from
the 8830 Printer Service Manual.
Remove the 8830 DDS Control Panel from the 7356 Scanner by loosening the three upper
screws on the Control Panel Mounting Plate, located at the rear of the 8830 DDS Control
Panel. Gently lift the Control Panel and place It upside-down upon the 7356 Scanner. Check
for 5 volts between TH1 and TH2 on the 8830 DDS Control Panel PWB. There is +5 volts
between TH1 and TH2.
Y N
Replace the 8830 DDS Control Penal power cable.
Perform the following:
Try adjusting the 8830 DDS Control Panel ambient intensity by rotating the trim pot on the
8830 DDS Control Panel Main PWB. A small jeweler's screwdriver wilt be required to
make this adjustment.
Replace the 8830 DDS Control Panel.
Repair Analysis Procedures
1.2
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2-4 8830 DDS