Kyocera TASKalfa 5551ci - Developer Unit K Type Mismatch Error; Developer Unit C Type Mismatch Error; Developer Unit M Type Mismatch Error; Developer Unit y Type Mismatch Error

2L6/2N6/2N5/2N4
1-4-155
7401 Developer unit K type mis-
match error
Improper adaptation of the
machine and developer unit K
is detected.
Different type of the
developer unit is
installed.
Install the developer unit of the correct type.
Developer unit K
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Developer unit K and Front PWB (YC9)
Front PWB (YC2) and Engine PWB
(YC10)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
7402 Developer unit C type mis-
match error
Improper adaptation of the
machine and developer unit C
is detected.
Different type of the
developer unit is
installed.
Install the developer unit of the correct type.
Developer unit C
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Developer unit C and Front PWB (YC13)
Front PWB (YC2) and Engine PWB
(YC10)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
7403 Developer unit M type mis-
match error
Improper adaptation of the
machine and developer unit M
is detected.
Different type of the
developer unit is
installed.
Install the developer unit of the correct type.
Developer unit M
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Developer unit M and Front PWB (YC11)
Front PWB (YC2) and Engine PWB
(YC10)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
7404 Developer unit Y type mis-
match error
Improper adaptation of the
machine and developer unit Y
is detected.
Different type of the
developer unit is
installed.
Install the developer unit of the correct type.
Developer unit Y
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Developer unit Y and Front PWB (YC15)
Front PWB (YC2) and Engine PWB
(YC10)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
Code Contents Related parts
Check procedures/
corrective measures