Ricoh A-P4, Service Manual

Page: 149 / 381

• The power LED lights or flashes while machine is communicating with the network server, or while the
machine is accessing the hard disk or memory.
302 D
Charge roller current leak
• Charge roller damaged
• HVPS pack defective
• PCU harness defective or disconnect-
ed
Charge leak detected when charge was
applied to the charge roller. The upper limit
of PWM duty was detected (65%) for 60
ms.
304 D
Charge roller current correction error
• Charge roller defective due to exces-
sive wear
The charge roller bias correction was done
twice but maximum charge was not detect-
ed even after the maximum charge roller
bias (–2kV) was applied to the roller.
321 D
F-Gate error
• BICU board defective
• PCI harness between the controller
board and the BICU defective or dis-
connected
No laser signal. The laser write signal (F-
GATE) did not go to LOW within 60 sec.
after the copy paper reached the registra-
tion sensor.
322 D
Synchronization error • Laser synchronization board connec-
tors or harness loose, disconnected,
or damaged
• Laser synchronization board defective
or out of position
• LD drive board defective
The synchronization signal was not issued
within 500 ms after the LD fired while the
polygon motor was turning at the pre-
scribed number of revolutions.
323 D
LD drive current too high • LD unit defective (not enough power,
due to aging)
• Poor connection between the LD unit
and the BICU board
• BICU defective
The LD drive board output to the LD ex-
ceeded 100 mA .
327 D
LD unit home position error 1
• LD unit HP sensor/harness defective
4. Troubleshooting
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