Sharp AR-M420U with L4-02 error

[Luong Nam]

Hello
My AR-M420U has a problem with L4-02 error code.
Please , help me.
TIA

[xmasvn]

check drum motor

L4-2: Drum motor lock detection
Detail: The motor lock signal is detected for
1.5sec during rotation of the drum
motor
Cause:
- Drum motor trouble
Improper connection of harness
between the PCU PWB and the drum
motor.
- Control circuit trouble
Check and remedy:
- Use SIM25-1 to check the drum motor
operation.
- Check harness and connector between
the PCU PWB and the drum moto

Motor_420_1.jpg

open the back on the machine and run 25-1 check this run or not