2MV-8
1-4-31
6990 Fuser unit type mismatch
problem
Absence of the fuser unit is
detected.
Defective PWB. Replace the IH PWB and check for correct
operation (see page 1-5-53).
7101
Toner sensor K error
The sensor outputs are for 5
seconds, 23 or less, or 248
or more.
Defective Devel-
oper unit.
Replace the developer unit K
(see page 1-5-14).
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-45).
7102
Toner sensor C error
The sensor outputs are for 5
seconds, 23 or less, or 248
or more.
Defective Devel-
oper unit.
Replace the developer unit C
(see page 1-5-14).
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-45).
7103
Toner sensor M error
The sensor outputs are for 5
seconds, 23 or less, or 248
or more.
Defective Devel-
oper unit.
Replace the developer unit M
(see page 1-5-14).
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-45).
7104
Toner sensor Y error
The sensor outputs are for 5
seconds, 23 or less, or 248
or more.
Defective Devel-
oper unit.
Replace the developer unit Y
(see page 1-5-14).
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-45).
7401 Developer unit K type mis-
match error
Absence of the developer unit
K is detected.
Defective connec-
tor cable or poor
contact in the con-
nector.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Developer unit K and drum connect PWB
(YC9)
Drum connect PWB and engine PWB (YC4)
Different type of
the developer unit
is installed.
Install the correct developer unit
(see page 1-5-14).
Code Contents Causes
Check procedures/
corrective measures
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