Xerox Phaser 7760 - Page 91

January 2010
2-55
Phaser 7760 Color Laser Printer
004-605, 004-640
Status Indicator RAP’s
Revised
004-605 Printer NVRAM Corrupt
The system detected that the NVRAM of the Printer is empty.
Procedure
Turn the printer power Off, then On. The problem continues.
YN
Return to Service Call Procedures.
Replace the Engine Control Board (MCU PWB) (PL 13.1).
CAUTION
Careful replacement of the MCU NVRAM PWB is important to avoid serious machine failure.
If the problem continues, replace the Engine Control Board (MCU PWB) NVRAM (PL 13.1).
004-640 Belt Tracking
IBT tracking failure.
Procedure
BSD: CH9.19 CH9.31A
Check if actuator for IBT Edge Sensor touches belt edge. IBT Edge Sensor touches belt
edge.
YN
Check actuator installation.
Turn the printer power On. Measure voltage between I/F PWB P539-A3(+) and GND(-).
Between +3 VDC and 1 VDC is measured.
YN
Measure voltage between I/F PWB P539-A1(+) P539-A2(-). +5 VDC is measured.
YN
Check +5 VDC circuit to I/F PWB P539-A1.
Measure voltage between I/F PWB P539-A3(+) and GND(-). +5 VDC is measured.
YN
Measure voltage between I/F PWB P539-A3(+) and GND(-). 0 VDC is measured.
YN
Check wire damage or bad connection between I/F PWB P539A and IBT Edge
Sensor J119.
If the check is good, replace IBT Edge Sensor.
If the problem continues, replace the Engine Control Board (MCU PWB) (PL
13.1).
Check wire damage or bad connection between I/F PWB P539-A3 and IBT Edge
Sensor J119-2.
Replace IBT Edge Sensor.
Measure voltage between I/F PWB P539-A1(+) and GND(-). +24 VDC is measured.
YN
Following Wire Network, check +24 VDC circuit up to I/F PWB P539-A1.
Remove IBT Assembly (REP 9.15). Enter Service Diagnostics Menu: Printer Menu > Trouble-
shooting > Service Tools > Printer Status Page > hold the Up and Down buttons simulta-
neously > Run Service Diagnostics > OK. Perform the Steering Motor test. IBT Steering
Motor energizes.
YN
Check wire damage or bad connection between I/F PWB J537 and IBT Steering Motor
P207. There are broken wires or bad connections.
YN
Replace the Engine Control Board (MCU PWB) (PL 13.1).
If the problem continues, replace I/F PWB (PL 9.1).
If the problem continues, replace IBT Steering Motor (PL 1.3).
Repair broken wire and bad connection.
A