Ricoh SH-P1 M020 Field Service Manual page 250

6. Troubleshooting
FGATE OFF error
The FGATE signal did not go off within
10 seconds after the machine finished
231 D
writing. (The BCU generates the
FGATE signal and sends it to the LD
unit when the registration sensor
switches on.)
LD error
240 C
The IPU detected a problem at the LD
unit.
6
Charge roller current leak
The PWM duty output exceeded 50%
312 D
for longer than 200 ms, indicating a
leak in the charge roller current.
Development Bias leak
The PWM duty output exceeded 50%
320 D
for longer than 200 ms, indicating a
leak in the charge roller current.
248
• Defective GAVD and PCI bridge ASIC
• Turn the Power Switch Off and On.
• Replace the controller board.
• Defective LD unit
• Disconnect harness.
• Disconnect LD Driver.
• Connect the harness properly.
• Replace the LD unit.
• Cartridge (charge roller) defective
• High voltage supply board defective
• Disconnect harness.
• Turn the Power Switch Off and On.
• Connect the harness properly.
• Replace the AIO unit.
• Replace the High voltage power supply
board.
• Bias applying section leak
• High voltage supply board defective
• Disconnect harness
• Development Bias CN loose
• Connect the harnesses properly.
• Replace the AIO.
• Replace High voltage power supply
board.