Ricoh M160 Service Manual page 261

SC No. Level
SC547-01 D
SC547-02 D
SC547-03 D
SM
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)

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
- 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 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.
6-17
Service Call
M160/M161