2L6/2N6/2N5/2N4
1-4-109
4011 Polygon motor K steady-
state error
After polygon motor K is stabi-
lized, the ready signal is at the
H level for 15 s continuously.
Polygon motor K
(LSU)
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Polygon motor K and LSU relay PWB
(YC4)
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).
4012 Polygon motor C steady-
state error
After polygon motor C is stabi-
lized, the ready signal is at the
H level for 15 s continuously.
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).
4013 Polygon motor M steady-
state error
After polygon motor M is sta-
bilized, the ready signal is at
the H level for 15 s continu-
ously.
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
Check the engine software and upgrade to
the latest, if necessary.
Replace the engine PWB (see page 1-5-80).
Code Contents Related parts
Check procedures/
corrective measures
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