Gestetner B003 Service Manual page 194

SERVICE CALL CONDITIONS
Code No.
541 A Fusing thermistor open
The fusing temperature detected by the
thermistor was below 7°C (44.6
seconds, or 2 seconds after reaching
o
45 C (113
reach an additional 15
checking five times at 0.1 intervals.
542 A Fusing temperature warm-up error
The fusing temperature does not reach
the fusing standby temperature of 45
o
(113 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
o
50 C the fusing roller does not reach
warm-up temperature.
543 A Fusing overheat error (software
detection)
A fusing temperature of over 230°C
o
(446 F) is detected for 5 seconds by the
fusing thermistors at the center or at
either end of the fusing roller.
544 A Fusing overheat error (hardware circuit
detection)
The dual monitoring circuitry of the
BICU detects extremely high
temperature and tripped the relay circuit
off.
545 A Fusing lamp remains on
After warm-up the fusing lamp remains
at full power for 10 seconds without the
hot roller rotating.
546 A Fusing ready temperature unstable
The fusing temperature is fluctuating.
547 B Zero cross signal malfunction
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.
548 A Fusing unit installation error
The machine cannot detect the fusing
unit when the front cover and right
cover are closed.
599 C 1-bin tray motor lock (optional 1-bin tray
unit)
A 1-bin tray motor lock signal is not
detected for more than 300 ms during
rotation.
B003/B004/B006/B007
Symptom
o
o
F) the temperature does not
o o
C (59 F) after
4-8
Fusing thermistor disconnected
Fusing thermistor connector defective
Fusing thermistor damaged or warped
F) for 5
Fusing temperature –15% less than the
standard input voltage
Fusing lamp defective
Poor fusing unit connector
o
Thermistor warped or broken
C
Thermostat has tripped
BICU defective
Power supply board defective
Power supply unit defective
I/O board (IOB) defective
BICU defective
Fusing thermistor defective
Power supply unit defective
I/O board (IOB) defective
BICU defective
Fusing thermistor defective
Thermistor is out of position.
Thermistor connection loose
Fusing unit connector loose
Power supply board defective
Noise on the ac power line
Fusing unit is not installed
Fusing unit connection loose
1-bin tray motor locked from overload
1-bin tray motor defective
1-bin tray motor connection loose
Possible Cause
SM