LG LSRG309ST Service Manual page 58

CHECKING FLOW CHART BY FAILURE
Door Lock System
Failure,F-10?
Yes
Note :
Just after self-clean start, the door lock motor starts to
rotate.
During that time if the door lock switch does not operate
properly after rotating twice, then supervising circuit
detects a Door Lock failure and the F-10 error code
appears.
Power Off
1
Is the disconnect or loose
connector?
1. Between Main PCB and
Relay PCB (CN7, CN8)
2.Electric wiring of relay PCB(CN9)
3.Electric wiring of Locking Motor and Micro Switch
4.Electric wiring of CN4 of Main PCB
CN8 CN8 CN8 CN8 CN8 CN8 CN8
CN8 CN8 CN8 CN8 CN8 CN8
CN8 CN8 CN8 CN8
CN8 CN8 CN8 CN8 CN8
CN7 CN7 CN7 CN7 CN7
CN7 CN7 CN7 CN7
CN7 CN7 CN7 CN7 CN7 CN7
CN7 CN7 CN7 CN7 CN7 CN7 CN7
No
Reconnect
Yes
or repair
the connector
CN9
CN4
Power Off
2
Is the door lock switch
(micro switch) normal?
measure the resistance of
door lock switch normally open type
Yes
Power Off
3
Is the resistance of the
locking motor normal ?
measure the resistance of
locking motor
Normal : approximately 2.6kΩ
Abnormal : infinite or below 5 Ω
Yes
Replace the Relay PCB (EBR52349701)
10-9
No
Replace the
micro switch
Abnormal Normal
Continuity Infinite
No
Replace the
locking motor