Ricoh MP C6502SP Field Service Manual page 1208

5. Troubleshooting
SC No.
SC719-09
SC No.
SC720-01
1206
Level Error Name/Error Condition/Major Cause/Solution
Buffer pass unit_CTB_+24VINT_Power supply error
Detected +24VINT power OFF of the Buffer pass unit PCB: CTB.
• Buffer pass unit PSU defect
• Connecter disconnected
• Harness ground fault/broken
• 24V load (motor/fan) layer short
• PCB defective
D
• Fuse tripped (PSU, PCB)
• PCB relay defect
• Replace the Buffer pass unit PSU.
• Reconnect the connector.
• Replace the harness.
• Replace the motor/fan.
• Replace the PCB.
Level Error Name/Error Condition/Major Cause/Solution
Downstream device communication error (D703/D704)
Communication with the downstream device has established, but the
device is not responding to the command sent out, even after being sent
three times.
• Interface cable (downstream device side) connector disconnected
or broken
D
• PCB of downstream device defective
• Controller PCB defective
• Replace the controller board.
• Replace the PCB of downstream device.
• Replace the interface cable.