DOWNLOAD LG AS-H126U / LS-C126U / LS-H126U Service Manual ↓ Size: 8.66 MB | Pages: 127 in PDF or view online for FREE

Model
AS-H126U LS-C126U LS-H126U
Pages
127
Size
8.66 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner
File
as-h126u-ls-c126u-ls-h126u.zip
Date
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-49-
Check the TRIAC high speed operation by remote control.
(The Indoor Fan Motor is connected)
Turn off Main power
Check the connection of CN-MOTOR
Check the Fan Motor
Check the Fuse(AC250V/T2A)
Turn ON Main Power
Check the related circuit of indoor Fan Motor.
• The pin NO 58 of Micom, and the part for driving TRIAC(the input and
output signal of IC01M, PIN NO 7, 10)
• Check the pattern
• Check the TRIAC
- TRIAC Open: Indoor Fan Motor never operate
- TRIAC short: Indoor Fan Motor always operates in case of ON or OFF.
4. When indoor Fan does not operate.
The voltage of PIN NO 1(Black) and 3(Black) of CN-MOTOR.
About AC 180V over
About AC 50V below
TRIAC is not damaged
TRIAC change
-50-
• 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
Louver with hands 
Normal
• Check the connecting condition 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
-51-
• 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
Louver with hands 
Normal
• Check the connecting condition 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
-52-
• 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
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
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