Toshiba e-STUDIO 4500c, Service Manual

Page: 431 / 1120

April, 2007 SERVICE CALL CONDITIONS
4-53
Pressure roller thermistor error 3: Software - High temperature SC553 A
The thermistor detected a
temperature over 220
°
C.
•
TRIAC short
•
IOB defective
•
BICU defective
•
Fusing temperature control is erratic
Do SP5810 to cancel the SC fusing code.
Pressure roller thermistor error 4: Hardware - High temperature SC554 A
The thermistor detected a
temperature over 230
°
C.
•
TRIAC short
•
IOB defective
•
BICU defective
•
Fusing temperature control is erratic
Do SP5810 to cancel the SC fusing code.
Pressure roller thermistor error 5: Lamp remains ON SC555 A
After hot roller reaches warmup
temperature, the pressure roller
fusing lamp remains for 6 sec.
while the hot roller is not
rotating.
•
Thermistor damaged, or out of position
•
Fusing lamp disconnected, broken
Do SP5810 to cancel the SC fusing code.
Heating roller thermistor 2 error 5: Lamp remains ON SC556 A
After hot roller reaches warmup
temperature, the pressure roller
fusing lamp remains for 6 sec.
while the hot roller is not rotating.
•
Thermistor damaged, or out of position
•
Fusing lamp disconnected, broken
Hot roller thermistor error 1: Thermistor disconnected SC561 A
The temperature measured by the hot roller
thermistor does not reach the prescribed
warm-up temperature within 100 sec.
•
Loose connection of the hot
roller thermistor
•
Defective hot roller
thermistor
•
Defective BICU
Hot roller thermistor error 2: Failure to reach warmup temperature SC562 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
ready temperature.
•
Hot roller fusing lamp broken
•
Defective hot roller
thermistor
•
Defective BICU
Do SP5810 to cancel the SC fusing code.