e-STUDIO2006/2306/2506/2007/2307/2507/2303A/2303AM/2803AM/2309A/2809A
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ERROR CODE AND TROUBLESHOOTING
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[C412] Thermistor or heater lamp abnormality at power-ON
Classification Error content
Fuser unit related service call Thermistor or heater is abnormal at power ON
Check item Measure
1. Check the thermistors 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.
2. Check the heater 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.
3. Check the MAIN board 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.
Check the bias plate 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.
Check the power supply Replace the switching regulator.
4. Clear the status counter 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.
Parts to be replaced Remark
MAIN board
Thermistors
Heater lamp
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