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Troubleshooting ＞ Self-diagnostic function
[CONFIDENTIAL]
7410 Drum unit type mismatch error
The drum PWB EEPROM does not
communicate
normally.
Absence of the drum unit
is detected.
Defective connector
cable or poor contact in
the connector.
Reinsert the connector. Also check for continuity within
the connector cable. If none, replace the cable.
Drum unit and drum connect PWB (YC1)
Drum connect PWB(YC2) and relay-L PWB (YC3)
Relay-L PWB(YC1) and engine PWB (YC2)
Defective toner sensor. Replace the drum unit.
Defective engine PWB. Replace the engine PWB and check for correct
operation.
7800 Broken external thermistor wire
The average of thermistor output
value of 93 or less.
Defective connector
cable or poor contact in
the connector.
Reinsert the connector. Also check for continuity within
the connector cable. If none, replace the cable.
Operation PWB (YC1) and engine PWB (YC17)
Defective temperature
sensor.
Replace the operation PWB.
7810 Short-circuited external thermistor
wire
The average of thermistor output
value of 930 or more.
Defective connector
cable or poor contact in
the connector.
Reinsert the connector. Also check for continuity within
the connector cable. If none, replace the cable.
Operation PWB (YC1) and engine PWB (YC17)
Defective temperature
sensor.
Replace the operation PWB.
7900 Drum unit EEPROM error
No response is issued from the
device in reading/writing for 5 ms or
more and this problem is repeated
five times successively.
Mismatch of reading data from two
locations occurs eight times
successively.
Mismatch between writing data and
reading data occurs eight times
successively.
Defective connector
cable or poor contact in
the connector.
Reinsert the connector. Also check for continuity within
the connector cable. If none, replace the cable.
Drum unit and drum connect PWB (YC1)
Drum connect PWB(YC2) and relay-L PWB (YC3)
Relay-L PWB(YC1) and engine PWB (YC2)
Defective drum unit. Replace the drum unit.
F000 Main PWB - operation PWB
communication error
Defective connector
cable or poor contact in
the connector.
Reinsert the connector. Also check for continuity within
the connector cable. If none, replace the cable.
Operation PWB(YC1) and engine PWB (YC17)
Defective main PWB. Turn the main power switch off/on to restart the
machine. If the error is not resolved, replace main
PWB.
Defective operation
PWB.
Replace the operation PWB and check for correct
operation.
F010 Main PWB checksum error Defective main PWB. Turn the main power switch off/on to restart the
machine. If the error is not resolved, replace main
PWB.
F020 Main PWB RAM checksum error Defective main memory
(RAM) in main PWB
Turn the main power switch off/on to restart the
machine. If the error is not resolved, replace main
PWB.
Defective expended
memory (DIMM)
Replace the expansion memory (DIMM).
Also in the case of the capacity besides specification, it
displays.
Code Contents Causes Check procedures/
corrective measures
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