Vdc Interlocked Power Rap - Xerox Phaser 790 Service Manual

001-703 +24 VDC Interlocked Power RAP

Initial Actions
Ensure the Left Front Cover, the Registration/Bypass Tray Drawer, and the Main Fuser Assem-
bly are closed and in the correct position.
Ensure that the actuator for the Left Front Cover Interlock is not broken.
Procedure
Switch off the power. Remove the Rear Cover. Switch on the power. +24 VDC is measured
between J32-5 on the Low Voltage Power Supply and machine frame.
Y N
+5.0 VDC is measured between J32-18 and machine frame.
Y N
Approximately +4.4 VDC is measured between J32-16 and machine frame.
Y N
Go to Flag 6. Check the wire for an open circuit. If the wire is good, replace the
MCU PWB (PL 11.2).
Replace the Low Voltage Power Supply (PL 11.1).
+5.0 VDC is measured between J33-9 on the Low Voltage Power Supply and
machine frame.
Y N
+5.0 VDC is measured between J199-1 (brown wire) on the Left Front Cover
Interlock and machine frame.
Y N
Go to Flag 5. Check the wire for an open circuit.
+5.0 VDC is measured between J198-1 (yellow wire) on the Left Front Cover
Interlock and machine frame.
Y N
Replace the Left Front Cover Interlock (PL 11.1).
Check the following:
• Go to Flag 2, Flag 3, and Flag 4. Check the wires for an open circuit.
• If the wires are good, check the connectors between the Low Voltage Power
Supply and the Left Front Cover Interlock for bent or broken pins or for dam-
aged connectors (P/J70, P/J71, P/J97, and P/J91).
Replace the Low Voltage Power Supply (PL 11.1).
The Low Voltage Power Supply appears to be operating correctly.
Initial Issue
Phaser 790/DocuColor 2006
10/00
2-9
Status Indicator RAPs
001-703