U7-0 Ui Communication Timeout; U7-1 Ui Communication Error - Xerox WorkCentre 5020 Service Documentation

U7-0 UI Communication TimeOut

BSD-Reference: CH2.1 (Figure 1)
Explanation
At Power ON, the AIOC PWB does not communicate with the User Interface PWB.
Procedure
Measure each voltage between AIOC PWB J401-1 ( P/J401) (+), J401-2 (+), and GND (-).
The voltages are approximately +5VDC.
Y N
Replace the AIOC PWB (PL 8.1) (REP 8.1.1).
Check the wire between J401 ( P/J401) and J710 ( P/J710). The wire is neither shorted nor
open.
Y N
Repair the wire.
Replace the User Interface PWB (PL 8.4) (REP 8.4.1) and the AIOC PWB (PL 8.1) (REP 8.1.1)
in that order.
Initial Issue
WorkCentre 5020

U7-1 UI Communication Error

BSD-Reference: CH2.1 (Figure 1)
Explanation
The User Interface PWB detected a communication failure.
Procedure
Check each User Inferface PWB connector. Each connector is connected securely.
Y N
Connect each connector securely.
Turn the power OFF and ON. U7-1 recurs.
Y N
Completed
Replace the User Interface PWB (PL 8.4) (REP 8.4.1).
July, 2007
2-31
Status Indicator RAPS
U7-0, U7-1