When vertical louver does not operate, Service manual 67 troubleshooting guide – LG LA120CPI User Manual
Page 67
Service Manual 67
Troubleshooting Guide
When Vertical Louver does not operate.
• Confirm that the Vertical Louver is normally geared with the shaft of
Stepping Motor.
• If the regular torque is detected when rotating the Vertical Louver with
hands
Normal
• Check the connecting condition of CN-UP/DOWN Connector
• Check the soldering condition(on PWB) of CN-UP/DOWN Connector
Check the operating circuit of the Vertical Louver
• Confirm that there is DC +12V between pin
(RED) of CN-UP/DOWN and
GND.
• Confirm that there is a soldering short at following terminals.
- Between
77
,
78
,
79
and
80
of MICOM
- Between
4
,
5
,
6
and
7
of IC02M
- Between
10
,
11
,
12
and
13
of IC01M
- Between
1
,
2
,
3
,
4
and
5
of CN-UP/DOWN
If there are no problems after above checks
• Confirm the assembly conditions that are catching and interfering parts in
the rotation radial of the Vertical Louver