Ricoh M160 - Page 261

Service Call
SM 6-17 M160/M161
Troubleshooting
SC No. Level Error Name/Error Condition/Major Cause/Solution
SC547-01 D
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)
 Turn the main power OFF and then ON.
 Replace the harness.
 Replace the PC board.
 Replace the PSU.
SC547-02 D
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
- 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.
SC547-03 D
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 is unstable.
 Turn the main power OFF and then ON.
 Check the commercial power supply.
 Replace the harness.
 Replace the Engine Board.
 Replace the PSU.