Toshiba e-STUDIO4500c Service Manual page 430

SERVICE CALL CONDITIONS
SC548 A Heating roller thermistor 2 error 2: Failed to reach warmup temperature
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.
SC549 A Heating roller thermistor 2 error 3: Software - High Temperature
The thermistor detected a
temperature over 250 C.
Do SP5810 to cancel the SC fusing code.
SC550 A Heating roller thermistor 2 error 4: Hardware - High Temperature
The thermistor detected a
temperature over 260 C.
Do SP5810 to cancel the SC fusing code.
SC551 A Pressure roller thermistor error 1
The temperature measured by the pressure
roller thermistor does not reach 0°C for 200
sec.
Do SP5810 to cancel the SC fusing code.
SC552 A Pressure roller thermistor error 2
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
ready temperature.
Thermistor is bent, installed
incorrectly
Defective heating roller thermistor
Heating roller fusing lamp broken
Defective BICU
TRIAC short
IOB defective
BICU defective
Fusing temperature control is erratic
TRIAC short
IOB defective
BICU defective
Fusing temperature control is erratic
Loose connection of the
pressure roller thermistor
Defective pressure roller
thermistor
Defective BICU
Pressure roller thermistor
harness loose, disconnected,
defective
Pressure roller thermistor
defective
4-52
April 2007