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e-STUDIO2020C/2330C/2820C/2830C/3520C/3530C/4520C
ERROR CODE AND TROUBLESHOOTING
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[C450]
Abnormal temperature difference between the center thermopile and the edge thermistor (Not
determined)
[C451]
Abnormal temperature difference between the center thermopile and the edge thermistor
(Determined)
[C452]
Abnormal thermopile temperature difference
1. Check the power supply unit and fuser unit
(1)
Check if the fuser unit is installed properly.
(2)
Check if foreign matter or paper in the fuser unit is plugging up the monitoring opening of the
thermopile.
(3)
Check if the heater lamp is open circuited.
(4)
Check if the connector of the heater lamp is disconnected.
(5)
Check if the thermistor is open circuited.
(6)
Check if the connectors of the power supply unit (power supply unit AC output connector CN408,
CN409 and LGC/IF connector CN404) are disconnected.
(7)
Check if the power supply unit is broken.
* Replace it if it is broken.
2. Check the thermopile
(1)
Check if foreign matter is plugging up the thermopile.
(2)
Check if the thermopile is installed properly.
(3)
Check if the harnesses are open circuited.
(4)
Replace the thermopile.
3. Check the LGC board
(1)
Check if the connectors CN333, CN345 and CN361 are disconnected.
(2)
Check if the conductor pattern on the LGC board is short circuited or open circuited.
(3)
Replace the LGC board.
4. Reset the status counter
(1)
Turn the power ON while [0] and [8] are pressed simultaneously.
(2)
Key in "400", and then press the [START] button.
(3)
Reset the displayed current status counter value "38", "39", "48" or "49" to "0", then press
[ENTER] or [INTERRUPT]. (The error C450, C451 or C452 is cleared.)
(4)
Turn the power OFF and then back ON. Then check that the equipment normally enters into the
standby mode.
[C465/C466/C467/C468] Pressure roller thermistor abnormality after entering ready status
1. Check the pressure roller thermistor
(1)
Check if the connector is disconnected.
(2)
Check if the pressure roller center/rear thermistor is installed properly.
(3)
Check if the harnesses of the pressure roller center and rear thermistors are open circuited.
2. Check the power supply unit and fuser unit
(1)
Check if the fuser unit is installed properly.
(2)
Check if the pressure roller lamp is open circuited. (Check if the pressure roller lamp has electric
continuity.)
(3)
Check if the connector of the pressure roller lamp is disconnected.
(4)
Check if the thermistor is open circuited.
(5)
Check if the connectors of the power supply (power supply AC output connector CN409, LGCI/F
connector CN403) are disconnected.
