Fuser Unit Related Service Call - Toshiba e-STUDIO 5540C Service Manual

8.3.15

Fuser unit related service call

Be sure to turn OFF the power and unplug the power cable beforehand when checking the power
supply unit and fuser unit.
The fuser unit itself or the part of the unit remains heated and the capacitors are still charged after a
while the power cable is unplugged. So make sure the unit is cooled down enough before checking.
[C411] Thermistor or IH abnormality at power-ON
[C412] Thermistor/IH abnormality at power-ON
Classification
Fuser unit related service call
Check item
Power voltage
Error detection history
Thermopiles
Fuser unit
IH coil
IH board
LGC board
Status counter
Replace parts
Thermopiles
Fuser unit
IH coil
IH board
LGC board
e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C
ERROR CODE and TROUBLESHOOTING
Abnormality of the thermistor is detected when power is
turned ON or the temperature of the fuser belt does not rise in
a specified period of time after power is turned ON.(C411)
Thermistor abnormality is detected at power-ON or the fuser
belt temperature does not rise within a specified period of
time after power-ON.(C412)
• Check if the power voltage is normal.(Is the voltage during
the operation ±10% of the rated voltage?)
Check the error detection history of each temperature
detecting element when the error occurred. If any of the
elements detects an abnormal temperature, check step 3.
• 08-4530: Fuser belt center thermopile temperature
• 08-4532: Fuser belt edge thermistor temperature
• 08-4533: Pressure roller center thermistor temperature
• 08-4545: Pressure roller rear thermistor temperature
• Check if the fuser belt center and side thermopiles (front,
rear) are installed properly.
• Check if the harnesses of the fuser belt center and side
thermopiles (front, rear) are open circuited.
• Unit check
• Connector check
• Harness check
• Connector check
• Harness check
• Connector check
• Harness check
• Connector check (CN305, CN306)
• Harness check
1. [0], [8] Power ON.
2. Key in "2002", then press [START].
3. Change the current status counter value "1" or "2" to "0",
then press [ENTER] or [INTERRUPT] (to cancel [C411/
C412]).)
4. Turn the power OFF and then back ON. Make sure that
the equipment enters the normal ready state.
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Error item
Measures
Remarks