2K8
1-4-16
7004 Toner motor Y error
When the toner motor Y is driven, the
toner motor Y over-current detection sig-
nal is detected continuously for 50 times
(5 s) at 100 ms intervals.
Defective harness
between toner
motor Y and
engine PWB
(YC23), or
improper connec-
tor insertion.
Reinsert the connector. Also check for conti-
nuity within the connector harness. If none,
remedy or replace the harness.
Defective drive
transmission
system of the toner
motor Y.
Check if the gears rotate smoothly. If not,
grease the bushings and gears. Check for
broken gears and replace if any.
Defective toner
motor Y.
Replace the toner motor Y.
Defective engine
PWB.
Replace the engine PWB (See page 1-5-
29).
7401 Developing unit K non-installing error
No density detection signal is output
from toner sensor K in developing unit K.
Faulty connection
of the connector
between the devel-
oping PWB K and
drum relay PWB.
Check the installation of the developing unit
K and drum relay PWB and reinstall them if
necessary (See page 1-5-14).
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.
Defective toner
sensor K.
Replace the developing unit K (See page 1-
5-12).
Defective engine
PWB.
Replace the engine PWB (See page 1-5-
29).
7402 Developing unit C non-installing error
No density detection signal is output
from toner sensor C in developing unit C.
Faulty connection
of the connector
between the devel-
oping 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 1-5-14).
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.
Defective toner
sensor C.
Replace the developing unit C (See page 1-
5-12).
Defective engine
PWB.
Replace the engine PWB (See page 1-5-
29).
Code Contents
Remarks
Causes Check procedures/corrective measures