Kyocera TASKalfa 2551ci, Service Manual

Page: 344 / 756

2NP
1-4-37
4203 BD steady-state error M
The BD signal is not detected.
PD PWB M (LSU) 1. Confirm that the FCC wiring connector is
not distorted and connect the FCC
wiring all the way in.
Laser scanner unit and LSU relay PWB
(YC2)
LSU relay PWB (YC10) and Engine
PWB (YC13)
2. If the FCC wiring is disconnected,
replace the FCC wiring.
3. Replace the laser scanner unit (see
page 1-5-20).
Engine PWB 1. Check the engine software and upgrade
to the latest, if necessary.
2. Replace the engine PWB (see page 1-5-
42).
4204 BD steady-state error Y
The BD signal is not detected.
PD PWB Y (LSU) 1. Confirm that the FCC wiring connector is
not distorted and connect the FCC
wiring all the way in.
Laser scanner unit and LSU relay PWB
(YC4)
LSU relay PWB (YC10) and Engine
PWB (YC13)
2. If the FCC wiring is disconnected,
replace the FCC wiring.
3. Replace the laser scanner unit (see
page 1-5-20).
Engine PWB 1. Check the engine software and upgrade
to the latest, if necessary.
2. Replace the engine PWB (see page 1-5-
42).
4600 LSU cleaning motor error
When the LSU cleaning motor
is driven, an error signal is
detected continuously for 2 s.
Defective connec-
tor cable or poor
contact in the con-
nector. Reinsert the connector. Also check for conti-
nuity of the connector cable. If none, replace
the cable.
LSU cleaning motor and LSU connect
PWB(YC11)
LSU connect PWB and engine PWB(YC14)
Defective drive
transmission sys-
tem. Check if the rollers and gears rotate
smoothly. If not, grease the bushings and
gears. Check for broken gears and replace if
any.
Defective motor. Replace the LSU cleaning motor.
Defective PWB. Replace the engine PWB or LSU connect
PWB check for correct operation
(see page 1-5-39).
Code Contents Causes
Check procedures/
corrective measures