2L6/2N6/2N5/2N4
1-4-108
4002 Polygon motor C synchroni-
zation error
After polygon motor C is
driven, the ready signal does
not turn to L within 30 s.
The polygon motor speed
Polygon motor C
(LSU)
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Polygon motor C and LSU relay PWB
(YC9)
LSU relay PWB (YC3) and Engine PWB
(YC12)
2. If the wiring is disconnected, shorted or
grounded, replace the 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).
4003 Polygon motor M synchro-
nization error
After polygon motor M is
driven, the ready signal does
not turn to L within 30 s.
The polygon motor speed
Polygon motor M
(LSU)
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Polygon motor M and LSU relay PWB
(YC7)
LSU relay PWB (YC3) and Engine PWB
(YC12)
2. If the wiring is disconnected, shorted or
grounded, replace the 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).
4004 Polygon motor Y synchroni-
zation error
After polygon motor Y is
driven, the ready signal does
not turn to L within 30 s.
The polygon motor speed
Polygon motor Y
(LSU)
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Polygon motor Y and LSU relay PWB
(YC11)
LSU relay PWB (YC3) and Engine PWB
(YC12)
2. If the wiring is disconnected, shorted or
grounded, replace the 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).
Code Contents Related parts
Check procedures/
corrective measures
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