Ricoh Aficio MP171 Field Service Manual page 132

6. Troubleshooting
SC No.
SC547-01
SC547-02
SC547-03
130
Level Error Name/Error Condition/Major Cause/Solution
Zero-crossing error (adhered relay contact)
When the fusing relay is in an OFF state, a "zero-crossing interrupt
request" occurs in 50 ms.
Damaged fusing relay (adhered contact)
D
• Turn the main power OFF and then ON.
• Replace the harness.
• Replace the PC board.
• Replace the PSU.
Zero-crossing error (bad relay contact)
If a "zero-crossing interrupt request" does not occur when the fusing relay
is in an ON state, an error results.
• Damaged fusing relay (open contact)
• Failed fusing relay drive circuit
D
• PSU fuse (24VS) blown
• Turn the main power OFF and then ON.
• Replace the harness.
• Replace the Engine Board.
• Replace the PSU.
• Replace the fuse.
Zero-crossing error (low frequency error)
The number of zero-crossing interrupts does not reach a certain value in
500 ms.
The frequency of the commercial power supply line is unstable.
D
• Turn the main power OFF and then ON.
• Check the commercial power supply line.
• Replace the harness.
• Replace the Engine Board.
• Replace the PSU.