Ricoh G112 Service Manual page 75

Code No.
542 A Fusing temperature warm-up error
The fusing temperature does not
reach more than 80 °C 17.5 seconds
after the main switch is turned on.
543 A Fusing overheat error
A fusing temperature of over 245 °C
is detected for 1 second by the fusing
thermistor.
A fusing temperature of over 235 °C
is detected for 1 second after the
fusing lamp has been turned off.
The dual monitoring circuitry of the
BICU detects extremely high
temperature and tripped the relay
circuit off.
544 A Fusing overheat error (hardware
circuit detection)
G091
The dual monitoring circuitry of the
Only
BICU detects extremely high
temperature and tripped the relay
circuit off.
545 A Fusing lamp stays on
The fusing lamp stays on more than
12 seconds after the main motor has
been turned off.
546 A Unstable fusing temperature
During standby, within 500 ms, the
fusing temperature goes below 60 °C
twice or over 60 °C three times.
Within 1 minute, a 60 °C increase or
decrease in fusing temperature is
detected during five different one-
second intervals.
547 B Zero cross signal malfunction
Zero cross signals are not detected
within 5 seconds.
590 B Fusing fan motor error
G112
The CPU detects an exhaust fan lock
G113
signal for more than 3.5 seconds.
G094
The engine board cannot
G095
communicate with the duplex unit.
Only
610 B Communication error - duplex unit
The engine board cannot
communicate with the duplex unit.
SM
Symptom
4-3
SERVICE CALL CONDITIONS
Possible Cause
• Thermistor defective
• Fusing lamp open
• Fusing thermostat open
• Power supply board Defective
• Defective connection of the fusing
unit
• Fusing thermistor defective
• Power supply board defective
• Power supply unit defective
• I/O board (IOB) defective
• BICU defective
• Fusing thermistor defective
• Fusing thermistor defective
• Power supply board defective
• Defective connection of the fusing
unit
• Fusing thermistor defective
• Power supply board defective
• Defective connection of the fusing
unit
• Power supply board defective
• Defective mains power supply
condition
• Poor connection of the exhaust fan
motor
• Too much load on the motor drive
• Defective connection between
engine board and duplex unit
• Engine board defective
• Duplex control board defective
G112/G113/G116/G094/G095/G091