Toshiba e-STUDIO2006 Service Manual page 430

[C412] Thermistor or heater lamp abnormality at power-ON
Classification
Fuser unit related service call
Check item
1. Check the thermistors
2. Check the heater
3. Check the MAIN board
Check the bias plate
Check the power supply
4. Clear the status counter
Parts to be replaced
MAIN board
Thermistors
Heater lamp
e-STUDIO2006/2306/2506/2007/2307/2507/2303A/2303AM/2803AM/2309A/2809A
ERROR CODE AND TROUBLESHOOTING
Thermistor or heater is abnormal at power ON
1. Check if the connectors are disconnected.
2. Check if the center, side and edge thermistors are in contact
with the surface of the fuser roller properly.
3. Check if the center, side and edge thermistors are not
deformed or dirty.
4. Check if the harnesses of the center and edge thermistors
are open circuited.
1. Check if the heater is broken.
2. Check if the connector of the heater is disconnected.
3. Check if the harnesses are connected properly to the
terminals of the heater lamp.
4. Check if the thermostat is blown.
1. Check if any of the connectors on the MAIN board is
disconnected.
20L/23L/25L/20H/23H/25H: CN10
23LA/23LM/28LM/23HA/28HA: CN8
2. Check if the conductor pattern on the MAIN board is short
circuited or open circuited.
3. Replace the MAIN board.
1. Check if the fuser unit is tightly screwed to the equipment
with no gap.
2. Check if the bias plate in the fuser unit is in contact due to
deformation.
Replace the switching regulator.
After repairing the matter which caused the error [C412],
perform the following:
1. Turn ON the power while [0] and [8] are pressed
simultaneously.
2. Key in "2002", then press [START].
3. Change the current status counter value "2" to "0", then
press [OK] (to cancel [C412]).
4. Turn the power OFF and then back ON. Make sure that the
equipment enters the normal ready state.
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