LG LS-J0761NL_NM_NN / LS-J0962NL_NM_NN / LS-L1261NL_NM_NN / LS-K1860NL_NM_NN_YL / LS-K181N-1 Service Manual ▷ View online
-60-
• 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
• If the regular torque is detected when rotating the vertical louver with hands
⇒
Normal
• Check the connecting condition of CN-U/D Connector
• Check the soldering condition(on PCB) of CN-U/D Connector
• Check the soldering condition(on PCB) of CN-U/D Connector
Check the operating circuit of the vertical louver
• Confirm that there is DC +12V between pin
➀
of CN-U/D and GND.
• Confirm that there is a soldering short at following terminals.
- Between
➀
,
➁
,
➂
and
➃
of MICOM
- Between
4
,
5 , 6
and
7
of IC01M
- Between
10
,
11 , 12
and
13
of IC01M
When the horizontal louver does not operate.
Trouble 5
If there are no problems after above checks.
• Confirm the assembly condition that are catching and interfering parts in the link of the
vertical louver
-61-
Does the Operating LED of indoor unit blink
when Operation's ON?
when Operation's ON?
Is the Connection between indoor power
relay Pin
relay Pin
➂
and terminal block No. 1 right?
Refer to the self-diagnosis function.
The Outdoor Unit does not operate at all.
Trouble 6
YES
Check the connecting state of connector
NO
NO
Is the connection of cable between indoor
and outdoor unit right?
and outdoor unit right?
Indoor
Outdoor
1(Brown)
1(Brown)
2(Blue)
2(Blue)
3(Green/YL)
3(Green/YL)
4(Red)
4(Red)
NO
YES
Is the voltage of CN-POWER
➀
,
➁
in
outdoor PCB Ass'y about AC220V / 240V
when Operation's ON?
when Operation's ON?
Check the Fuse of Outdoor PCB Ass'y.
NO
YES
Is the voltage of CN-AC
➀
,
➂
in outdoor
PCB Ass'y about AC220V / 240V?
Check the PTC and RY-PWR.
NO
YES
Is the Bridge Diode(DB01Z) right?
Replace the Bridge Diode.
NO
YES
Replace the PCB Ass'y.
NO
-62-
Does the LED01M of outdoor PCB Ass'y
blink 6 times?
blink 6 times?
Check the state of connecting cable (3 line)
between indoor and outdoor uint.
between indoor and outdoor uint.
When compressor does not operate normally.
■
DC Peak Error(Error Code
➅
)
Trouble 7-1
NO
YES
Is the connecting state of connectors in
outdoor Sub. PCB Ass'y right?
(CN-UVW, CN-IPM)
outdoor Sub. PCB Ass'y right?
(CN-UVW, CN-IPM)
• Electrical wiring diagram (Colors)
• Check the connecting state of connectors
• Check the connecting state of connectors
in PCB Ass'y(Main/Sub)
• If CN-UWV is connected, the comprressor
can be operated a opposite direction.
NO
YES
Is the power module in Sub PCB Ass'y
right?
right?
• Check the short P-N P-U, V, W, and N-U,
V, W of IPM and then collector, emiter of
IGBT
IGBT
• Replace the Sub PCB Ass'y.
NO
YES
Is the voltage of CN-AC over than
AC170V?
AC170V?
Check the supplied voltage.
NO
YES
Is the voltage of CN-DC over than about
DC380V?
DC380V?
• Check CN-IPM connector(Pin No. 12)
• Replace the Sub PCB Ass'y.
• Replace the Sub PCB Ass'y.
NO
YES
Is the refrigerant pressure right?
Replace the PCB Ass'y.
• Main PCB Ass'y
• Sub PCB Ass'y
• Control Box Ass'y
• Sub PCB Ass'y
• Control Box Ass'y
Supply the refrigerant.
NO
NO
-63-
When compressor does not oprate normally.
■
Communication error between Indoor and Outdoor (Error Code
➄
)
Trouble 7-2
Does the operating LED in display PCB
Ass'y blink 5 times?
Ass'y blink 5 times?
• Check the state of connecting cable
(3 line) bewteen indoor and outdoor unit .
• Check Fuse, Noise Filter, PTC, etc.
NO
YES
Is the voltage of CN-POWER Pin No. 1,2
AC220/240V in Main PCB Ass'y.
AC220/240V in Main PCB Ass'y.
• Electrical wiring diagram(Colors)
• Check the connecting state
• Check the connecting state
of connectors in outdoor PCB Ass'y
(Main/Sub)
(Main/Sub)
• Check the Fuse of outdoor Control Box.
NO
YES
Is the voltage of CN-AC AC220/240V in
SUB PCB Ass'y?
SUB PCB Ass'y?
• Check the connecting state of connectors
in PCB Ass'y(Main/Sub).
NO
YES
Is the voltage of CN-DC over than
DC350V?
DC350V?
Replace the Sub PCB Ass'y.
NO
YES
Is the connection of CN-DATA between
indoor and outdoor unit right?
indoor and outdoor unit right?
Replace the PCB Ass'y.
• Main PCB Ass'y (Indoor/Outdoor)
• Control Box Ass'y.
• Control Box Ass'y.
• Reconnect the cable to terminal block.
• Check the PCB pattern(Resoldering).
• Check the PCB pattern(Resoldering).
NO
YES
