Kyocera TASKalfa 5551ci - BD Initialization Error M; BD Initialization Error y; BD Steady-State Error K

2L6/2N6/2N5/2N4
1-4-111
4103 BD initialization error M
After polygon motor M is
driven, the BD signal is not
detected for 1 s.
PD PWB M (LSU) 1. Confirm that the FFC wiring connector is
not distorted and connect the FFC wiring
all the way in.
Laser scanner unit and LSU relay PWB
(YC8)
LSU relay PWB (YC3) and Engine PWB
(YC12)
2. If the FFC wiring is disconnected,
replace the FFC wiring.
3. Replace the laser scanner unit (see
page 1-5-43).
Engine PWB 1. Check the engine software and upgrade
to the latest, if necessary.
2. Replace the engine PWB (see page 1-5-
80).
4104 BD initialization error Y
After polygon motor Y is
driven, the BD signal is not
detected for 1 s.
PD PWB Y (LSU) 1. Confirm that the FFC wiring connector is
not distorted and connect the FFC wiring
all the way in.
Laser scanner unit and LSU relay PWB
(YC12)
LSU relay PWB (YC3) and Engine PWB
(YC12)
2. If the FFC wiring is disconnected,
replace the FFC wiring.
3. Replace the laser scanner unit (see
page 1-5-43).
Engine PWB 1. Check the engine software and upgrade
to the latest, if necessary.
2. Replace the engine PWB (see page 1-5-
80).
4201 BD steady-state error K
The BD signal is not detected.
PD PWB K (LSU) 1. Confirm that the FFC wiring connector is
not distorted and connect the FFC wiring
all the way in.
Laser scanner unit and LSU relay PWB
(YC5)
LSU relay PWB (YC3) and Engine PWB
(YC12)
2. If the FFC wiring is disconnected,
shorted or grounded, replace the FFC
wiring.
3. Replace the laser scanner unit (see
page 1-5-43).
Engine PWB 1. Check the engine software and upgrade
to the latest, if necessary.
2. Replace the engine PWB (see page 1-5-
80).
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Check procedures/
corrective measures