2PR
1-4-25
7412 Drum unit C non-installing error
The EEPROM of drum PWB C does not
communicate normally.
Incompatible drum unit C is installed.
Faulty connection
of the connector
between the drum
PWB C and drum
relay PWB.
Check the installation of the developing unit
C and drum relay PWB and reinstall them if
necessary (See page 1-5-12).
Defective harness
between drum
relay PWB (YC1)
and engine PWB
(YC34), or
improper connec-
tor insertion.
Reinsert the connector. Also check for conti-
nuity within the connector harness. If none,
remedy or replace the harness.
Installation of
incompatible drum
unit C.
Install drum unit C compatible with the spec-
ifications to the printer.
Defective drum
PWB C.
Replace the drum unit C (See page 1-5-14).
Defective engine
PWB.
Replace the engine PWB (See page 1-5-
28).
7413 Drum unit M non-installing error
The EEPROM of drum PWB M does not
communicate normally.
Incompatible drum unit M is installed.
Faulty connection
of the connector
between the drum
PWB M and drum
relay PWB.
Check the installation of the developing unit
M and drum relay PWB and reinstall them if
necessary (See page 1-5-12).
Defective harness
between drum
relay PWB (YC1)
and engine PWB
(YC34), or
improper connec-
tor insertion.
Reinsert the connector. Also check for conti-
nuity within the connector harness. If none,
remedy or replace the harness.
Installation of
incompatible drum
unit M.
Install drum unit M compatible with the spec-
ifications to the printer.
Defective drum
PWB M.
Replace the drum unit M (See page 1-5-14).
Defective engine
PWB.
Replace the engine PWB (See page 1-5-
28).
Code Contents
Remarks
Causes Check procedures/corrective measures
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