Kyocera TASKalfa 7002i Service Manual page 1257

Step Check description
4 Replacing the engine PWB The engine PWB is faulty.
C4101: BD initialization error
The BD signal was not detected for 1s after driving the polygon motor.
Step Check description
1 Checking the connection
2 Checking the LSU
3 Firmware upgrade
4 Replacing the LSU relay
PWB
5 Replacing the engine PWB The engine PWB is faulty.
C4201: BD steady-state error
The BD signal is not detected during the laser lighting.
Step Check description
1 Checking the connection
Assumed cause
Assumed cause
The connector or the FFC
terminal is not properly
connected, or the wire or
the FFC is faulty.
The BD sensor or the laser
diode is faulty.
The firmware is not the lat-
est version.
The LSU relay PWB is
faulty.
Assumed cause
The connector or the FFC
terminal is not properly
connected, or the wire or
the FFC is faulty.
7-397
Measures
Replace the engine PWB.
Measures
Reconnect the following wire
connectors and reconnect the
FFC. If there is no continuity,
replace the wire. If the FFC
terminal section is deformed
or FFC is broken, replace the
FFC. • APC PWB - LSU
relay PWB • LSU relay PWB -
Engine PWB
Reinstall or replace the LSU
while paying attention to the
static electricity.
Upgrade the engine firmware
to the latest version
Replace the LSU relay PWB.
Replace the engine PWB.
Measures
Reconnect the following wire
connectors and reconnect the
FFC. If there is no continuity,
replace the wire. If the FFC
terminal section is deformed
or FFC is broken, replace the
FFC. • APC PWB - LSU
relay PWB • LSU relay PWB -
Engine PWB
2WA/2NJ/2RK
Reference
Detaching
and reat-
taching the
engine
PWB
Reference
Wiring dia-
gram
Detaching
and reat-
taching the
LSU
Firmware
Update
Detaching
and reat-
taching the
engine
PWB
Reference
Wiring dia-
gram