Ricoh G147 Service Manual page 163

Fusing overheat error (software
detection)
A fusing temperature of over 230°C
543 A
o
(446 F) is detected for 5 seconds by
the fusing thermistors at the center or
at either end of the hot roller.
Fusing overheat error (hardware
circuit detection)
The dual monitoring circuitry of the
544 A
BICU detected temperature above
o
250 C (482
circuit off.
Fusing lamp remains on
After warm-up the fusing lamp
545 A
remained at full power for 10 sec.
(center) and 15 sec. (ends) without
the hot roller rotating.
Zero cross signal error
One of the following occurred:
547 D
1. The fusing relay remained off for
50 ms after power on and
continued to remain off after the
SM
o
F) and tripped the relay
4-13
out of position
Thermostat has tripped
PSU defective
BICU defective
Check harnesses and
connectors of PSU, IOB, BICU
PSU defective
IOB defective
BICU defective
Fusing thermistor defective or
wrong type
Check harnesses and
connectors of PSU, IOB, BICU
PSU defective
IOB defective
BICU defective
Fusing thermistor defective or
wrong type
One or both thermistors out of
position.
PSU defective
Noise on the ac power line
G147