2KN/2KP
1-4-38
C4000 Polygon motor synchronization prob-
lem
• The revolution does not reach the sta-
ble speed within 20 s of the START
signal.
Poor contact in the
polygon motor con-
nector terminals.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
Defective polygon
motor.
Replace the laser scanner unit (see page 1-
5-36).
Defective engine
PWB.
Check if 24 V DC is supplied to YC17-1 on
the engine PWB. If not, replace the engine
PWB.
C4010 Polygon motor steady-state problem
• The polygon motor rotation is not sta-
ble for 5 s after the polygon motor rota-
tion has been stabilized.
Poor contact in the
polygon motor con-
nector terminals.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
Defective polygon
motor.
Replace the laser scanner unit (see page 1-
5-36).
Defective engine
PWB.
Check if 24 V DC is supplied to YC17-1 on
the engine PWB. If not, replace the engine
PWB.
C4100 BD initialization (A) problem
• When power is turned on, only laser A
is output and ASIC of main PWB
detects a BD error for 2000 ms.
Defective laser
scanner unit.
Replace the laser scanner unit (see page 1-
5-36).
Defective main
PWB.
Replace the main PWB and check for cor-
rect operation.
Poor contact in
connector termi-
nals.
Check the connection of connector YC8 on
the main PWB. Repair or replace if neces-
sary.
C4110 BD initialization (B) problem
• When power is turned on, only laser B
is output and ASIC of main PWB
detects a BD error for 2000 ms.
Defective laser
scanner unit.
Replace the laser scanner unit (see page 1-
5-36).
Defective main
PWB.
Replace the main PWB and check for cor-
rect operation.
Poor contact in
connector termi-
nals.
Check the connection of connector YC8 on
the main PWB and the continuity across the
connector terminals. Repair or replace if
necessary.
C4120 BD initialization (C) problem
• When power is turned on, only laser C
is output and ASIC of main PWB
detects a BD error for 2000 ms.
Defective laser
scanner unit.
Replace the laser scanner unit (see page 1-
5-36).
Defective main
PWB.
Replace the main PWB and check for cor-
rect operation.
Poor contact in
connector termi-
nals.
Check the connection of connector YC8 on
the main PWB and the continuity across the
connector terminals. Repair or replace if
necessary.
C4200 BD steady-state problem
• ASIC of the main PWB detects a BD
error A for 4000 ms after the polygon
motor rotation has been stabilized.
Defective laser
diode.
Replace the laser scanner unit (see page 1-
5-36).
Defective polygon
motor.
Re
place the laser scanner unit (see page 1-
5-36).
Defective main
PWB.
Replace the main PWB and check for cor-
rect operation.
Poor contact in
connector termi-
nals.
Check the connection of connector YC8 on
the main PWB and the continuity across the
connector terminals. Repair or replace if
necessary.
Code Contents
Remarks
Causes Check procedures/corrective measures
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