Fuser Unit Related Service Call - Toshiba DP4500 Service Handbook

5.1.10 Fuser unit related service call

CAUTION
Turn OFF the power to check the IH control circuit and IH coil.
[C41] Thermistor or heater is abnormal at power ON
Note: Unplug the power cable to prevent any kind of danger before checking the following 1 and 2.
1. Check the thermistors
(1) Check if the connectors are disconnected.
(2) Check if the center and side thermistors are in contact with the surface of the fuser roller properly?
(3) Check if the harnesses of the center and side thermistors are open-circuited.
2. Check the IH control board and IH coil
(1) Check if the IH coil is broken.
(2) Check if the connector of the IH coil is disconnected.
(3) Check if the thermostat is blown.
(4) Check if the connectors on the IH control board are disconnected (AC input connector and LGC I/F
connector J552).
(5) Check if the IH control board or the switching power supply unit are abnormal.
• Replace the IH control board.
3. Check the LGC board
(1) Check if the connectors J315 and J317 are disconnected.
(2) Check if the conductor pattern on the LGC board is short- or open-circuited.
(3) Replace the LGC board.
4. Clear the status counter
After repairing the matter which caused the error [C41], perform the following:
(1) Turn ON the power while [0] and [8] are pressed simultaneously.
(2) Enter "400" with the digital keys, then press the [START] key.
(3) Change the current status counter value "1" or "2" to "0", then press the [SET] key or [INTERRUPT] key
(to cancel [C41]).
(4) Turn the power OFF and then back ON. Make sure that the copier enters the normal standby state.
December 2000 © TOSHIBA TEC 5 - 57 DP4500/3500 TROUBLESHOOTING