LG LS-C126U_M0 / LS-H126U_M0 Service Manual ▷ View online
-49-
• Confirm that the up/down Vertical Louver is normally geared with the
shaft of Stepping Motor.
• If the regular torque is detected when rotating the up/down Vertical Lou-
ver with hands
Normal
• Check the connecting condition of CN-U/D Connector
• Check the soldering condition(on PWB) of CN-U/D Connector
• Check the soldering condition(on PWB) of CN-U/D Connector
If there are no problems after above checks
• Confirm the assembly conditions that are catching and interfering parts
in the rotation radial of the up/down Vertical Louver
5. When up/down Vertical Louver does not operate.
Check the up/down operating circuit of the Vertical Louver
• Confirm that there is DC +12V between pin
(Gray) of CN-U/D and
GND.
• Confirm that there is a soldering short at following terminals.
-
Between , , and of
MICOM
- Between
,
,
and
of IC01M
- Between
,
,
and
of IC01M
60
61
62
63
-50-
• Confirm that the left/right Vertical Louver is normally geared with the
shaft of Stepping Motor.
• If the regular torque is detected when rotating the left/right Vertical Lou-
ver with hands
Normal
• Check the connecting condition of CN-L/R Connector
• Check the soldering condition(on PWB) of CN-L/R Connector
• Check the soldering condition(on PWB) of CN-L/R Connector
If there are no problems after above checks
• Confirm the assembly conditions that are catching and interfering parts
in the rotation radial of the left/right Vertical Louver
6. When left/right Vertical Louver does not operate.
Check the left/right operating circuit of the Vertical Louver
• Confirm that there is DC +12V between pin
(Gray) of CN-L/R and
GND.
• Confirm that there is a soldering short at following terminals.
-
Between , , and of
MICOM
- Between
,
,
and
of IC02M
- Between
,
,
and
of IC02M
54
55
56
57
-51-
• Confirm that the Inlet Grille is normally geared with the shaft of Stepping
Motor.
• If the regular torque is detected when moving the Inlet Grille with hands
Normal
• Check the connecting condition of CN-SUC Connector
• Check the soldering condition(on PWB) of CN-SUC Connector
• Check the soldering condition(on PWB) of CN-SUC Connector
If there are no problems after above checks
• Confirm the assembly conditions that are catching and interfering parts
in the rotation radial of the Inlet Grille
7. When Inlet Grille does not operate.
Check the operating circuit of the Inlet Grille
• Confirm that there is DC +12V between pin
(RED) of CN-U/D and
GND.
• Confirm that there is a soldering short at following terminals.
- Between
,
,
and
of MICOM
- Between
,
,
and
of IC01G
- Between
,
,
and
of IC01G
-52-
8. When Heating does not operate
Operate “Heating Mode( )” by setting the desired temperature of the
remote control is higher than one of the indoor temperature by 2°C at
least.
remote control is higher than one of the indoor temperature by 2°C at
least.
In heating Mode, the indoor fan operates in case the pipe temperature
is higher than 28°C.
is higher than 28°C.
Check the connector of intake and pipe sensor(thermistors)
• Check the related circuit of RY-4WAY
• Check the indoor room temperature is disconnected or not (about
• Check the indoor room temperature is disconnected or not (about
10K
Ω
/at 25°C).
• Check the indoor pipe temperature is disconnected or not (about
5K
Ω
/at 25°C).
Turn ON Main Power
Check the DC voltage on the PWB ASSEMBLY
• The details of check are as followings
Check point
Between Micom
(NO.59) and GND
Between IC01M
(NO.11) and GND
Comp ON
DC 5V
Below DC 1V
Comp OFF
DC 0V
About DC
12V
Check point
Between Micom
(NO.52) and GND
Between IC02M
(NO.11) and GND
4 way ON
DC 5V
Below DC 1V
4 way OFF
DC 0V
About DC 12V
Check point
Between Micom
(NO.53) and GND
Between IC02M
(NO.12) and GND
Fan ON
DC 5V
Below DC 1V
Fan OFF
DC 0V
About DC 12V
• Comp Relay.
• 4 way Relay
• Outdoor fan Relay
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