Ricoh M001 Service Manual page 86

Service Call Conditions
Zero cross signal error
Zero cross signals of wavelength 50-60
Hz were not detected within 5 sec after
547 B
the fusing relay switched on.
-or-
Zero cross interrupts did not issue at
the prescribed 3 sec. intervals.
Fusing unit jam
Three consecutive paper lag jams
(paper failed to arrive) were detected in
the fusing unit.
-or-
During printing of the 1st side during
559 A
duplexing, the paper did not arrive at
the duplex entrance sensor three
times.
Note: SP1913 determines whether SC559 is issued. The default is off.
SC559 is not issued after three consecutive jams in the paper unit. If
SP1913 is set to on, turning the machine power off/on does not reset the jam
counter.
Fan motor error
590 B
The machine does not lock for 3sec
during rotating the fusing fan motor.
PSU fan error
591 B
The machine does not lock for 3sec
during rotating the PSU fan motor.
M001
Power supply board defective
Defective mains power supply
condition
Fusing unit installed
incorrectly
Fusing unit defective
Fan motor disconnected,
defective
Fan motor harness loose,
broken, defective
Defective PSU fan
4-6 SM