Ricoh A-C2 - Page 164

SERVICE CALL CONDITIONS 19 January, 2001
4-8
Code No. Symptom Possible Cause
Fusing thermistor open541 A
The fusing temperature detected by the
thermistor was below 7°C (44.6
o
F) for 5
seconds, or 2 seconds after reaching
45
o
C (113
o
F) the temperature does not
reach an additional 15
o
C (59
o
F) after
checking five times at 0.1 intervals.
• Fusing thermistor disconnected
• Fusing thermistor connector
defective
• Fusing thermistor damaged or
warped
• Fusing temperature –15% less than
the standard input voltage
Fusing temperature warm-up error542 A
The fusing temperature does not reach
the fusing standby temperature of 45
o
C
(113
o
F) within 9 seconds [for the
B003/B006 (35 cpm)]/14 seconds [for
the B004/B007 (45 cpm)] after
switching on the main power or closing
the front cover, or 40 seconds after
reaching 50
o
C the fusing roller does not
reach warm-up temperature.
• Fusing lamp defective
• Poor fusing unit connector
• Thermistor warped or broken
• Thermostat has tripped
• BICU defective
• Power supply board defective
Fusing overheat error (software
detection)
543 A
A fusing temperature of over 230°C
(446
o
F) is detected for 5 seconds by the
fusing thermistors at the center or at
either end of the fusing roller.
• Power supply unit defective
• I/O board (IOB) defective
• BICU defective
• Fusing thermistor defective
Fusing overheat error (hardware circuit
detection)
544 A
The dual monitoring circuitry of the
BICU detects extremely high
temperature and tripped the relay circuit
off.
• Power supply unit defective
• I/O board (IOB) defective
• BICU defective
• Fusing thermistor defective
Fusing lamp remains on545 A
After warm-up the fusing lamp remains
at full power for 10 seconds without the
hot roller rotating.
• Thermistor is out of position.
Fusing ready temperature unstable546 A
The fusing temperature is fluctuating.
• Thermistor connection loose
• Fusing unit connector loose
Zero cross signal malfunction547 B
The applied power supply ac frequency
was detected at over 66Hz or below
45Hz, and the zero cross signals are
not detected within a certain period
within 500 ms after the main power
switch has been turned on.
• Power supply board defective
• Noise on the ac power line
Fusing unit installation error548 A
The machine cannot detect the fusing
unit when the front cover and right
cover are closed.
• Fusing unit is not installed
• Fusing unit connection loose
1-bin tray motor lock (optional 1-bin tray
unit)
599 C
A 1-bin tray motor lock signal is not
detected for more than 300 ms during
rotation.
• 1-bin tray motor locked from overload
• 1-bin tray motor defective
• 1-bin tray motor connection loose