Kyocera TASKalfa 2551ci Service Manual page 351

Code Contents
6990 Fuser unit type mismatch
problem
Absence of the fuser unit is
detected.
7101
Toner sensor K error
The sensor outputs are for 5
seconds, 23 or less, or 248
or more.
7102
Toner sensor C error
The sensor outputs are for 5
seconds, 23 or less, or 248
or more.
7103
Toner sensor M error
The sensor outputs are for 5
seconds, 23 or less, or 248
or more.
7104
Toner sensor Y error
The sensor outputs are for 5
seconds, 23 or less, or 248
or more.
7401 Developer unit K type mis-
match error
Absence of the developer unit
K is detected.
Causes
Defective PWB. Replace the IH PWB and check for correct
operation (see page 1-5-57).
Defective Devel-
Replace the developer unit K
oper unit.
(see page 1-5-13).
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-39).
Defective Devel-
Replace the developer unit C
oper unit.
(see page 1-5-13).
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-39).
Defective Devel-
Replace the developer unit M
oper unit.
(see page 1-5-13).
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-39).
Defective Devel-
Replace the developer unit Y
oper unit.
(see page 1-5-13).
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-39).
Defective connec- Reinsert the connector. Also check for conti-
tor cable or poor nuity within the connector cable. If none,
contact in the con- replace the cable.
nector. Developer unit K and drum connect PWB
(YC9)
Drum connect PWB and engine PWB (YC4)
Different type of Install the correct developer unit
the developer unit (see page 1-5-13).
is installed.
1-4-44
Check procedures/
corrective measures
2NP