Ricoh B132 Service Manual page 450

SERVICE CALL CONDITIONS
SC545 A Heating roller thermistor 1 error 5: Lamp remains on
After hot roller reaches warmup
temperature, the fusing lamps
remained on at full capacity for
25 sec. after reaching the
warmup temperature while the
hot roller was not rotating.
Do SP5810 to cancel the SC fusing code.
SC546 A Heating roller thermistor 2 error 1: Thermistor disconnected
The temperature measured by
the heating roller thermistor
does not reach 0°C after 45 sec.
and remains over this
temperature for 10 readings.
Zero cross error
SC547 A
When the main switch is turned on, the
machine checks how many zero-cross
signals are generated within 500 ms. This
SC code is issued if the number of zero-
cross signals detected is either more than 66
or less than 45 for 10 readings.
Note: Zero cross signals, generated from an
ac power supply, are used to generate a
trigger pulses to control the applied power
accurately.
Normally, this SC is cancelled if you do SP5810 to cancel the SC fusing code.
Heating roller thermistor 2 error 2: Failed to reach warmup temperature
SC548 A
After the main switch is turned on or
the cover is closed, the heating roller
temperature does not reach the ready
temperature within 2 sec. after the
heater switches on.
-or-
If the roller was below 45°C, the
heating roller did not reach the ready
temperature 2 sec. after reaching
45°C.
Note: Thermistor 2 stops monitoring
the temperature once Thermistor 1
detects warmup temperature.
Do SP5810 to cancel the SC fusing code.
B132/B200
• Thermistor damaged, or out of position
• Fusing lamp disconnected, broken
• Loose connection of the heating roller
thermistor
• Defective heating roller thermistor
• Electrical noise on the power
supply line
• Fusing relay damaged:
replace the PSU.
• Thermistor is bent, installed
incorrectly
• Defective heating roller thermistor
• Heating roller fusing lamp broken
• Defective BCU
4-50 SM