LG HMC036KDT1 Service Manual - Page 35

Electronic, Parts, Troubleshooting, Guide

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Electronic Parts Troubleshooting Guide Electronic Parts Troubleshooting Guide 1. The Outdoor U (* Refer to Electronic Control Device drawing and Schematic diagram.) Turn off Main Power (After 10 seconds) Turn on Main Power ❑oes "beeping" sound is made from the Indoor Unit? ND YES Check the voltage of power(About AC 220V/AC240V, 60Hz) • Main power's voltage • Voltage applied to the unit • Connecting method of Indoor/Outdoor connecting cable - Check Fuse (Outdoor PCB Ass'y) • Check Varistor ZNRO1J(Outdoor PCB Ass'y) Primarily, the operating condition of Micom is OK. Check each load(Indoor/Outdoor Fan Motor, Compressor, Stepping Motor etc.) and contacting condition of related connector Check the connection housing for contacting • Connector related to CN-DCIAC • Display PWB Ass'y Check Items • Power Transformer (Outdoor unit) - Input Voltage - Output Voltage 4 • ICO1D(7812) Output (Indoor/Outdoor unit) • ICO2D(7805) Output (Indoor/Outdoor unit) 4 • ICO1A(KIA7036, Reset IC) X01(8MHz) PCB Board Operation Check Content Remedy - About AC220V/240V±- 10% - Check the power voltage - About AC14±3V • Replace Trans • DC +12V • Replace ICO1D • DC +5V • Replace ICO2D • Voltage of Micom No. 2, (DC +4.5V over) and Soldering condition. • Replace faulty parts Service Manual 35

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Electronic
Parts
Troubleshooting
Guide
Electronic
Parts
Troubleshooting
Guide
1.
The
Outdoor
U
(*
Refer
to
Electronic
Control
Device
drawing
and
Schematic
diagram.)
Turn
off
Main
Power
(After
10
seconds)
Turn
on
Main
Power
❑oes
"beeping"
sound
is
made
from
the
Indoor
Unit?
ND
Check
the
voltage
of
power(About
AC
220V/AC240V,
60Hz)
•
Main
power's
voltage
•
Voltage
applied
to
the
unit
•
Connecting
method
of
Indoor/Outdoor
connecting
cable
-
Check
Fuse
(Outdoor
PCB
Ass'y)
•
Check
Varistor
ZNRO1J(Outdoor
PCB
Ass'y)
Check
the
connection
housing
for
contacting
•
Connector
related
to
CN-DCIAC
•
Display
PWB
Ass'y
Check
YES
Primarily,
the
operating
condition
of
Micom
is
OK.
Check
each
load(Indoor/Outdoor
Fan
Motor,
Compressor,
Stepping
Motor
etc.)
and
contacting
condition
of
related
connector
PCB
Board
Operation
Check
Items
Content
Remedy
•
Power
Transformer
(Outdoor
unit)
-
About
AC220V/240V
-
±10%
-
Check
the
power
voltage
-
Input
Voltage
-
About
AC14±3V
•
Replace
Trans
-
Output
Voltage
4
•
DC
+12V
•
ICO1D(7812)
Output
•
Replace
ICO1D
(Indoor/Outdoor
unit)
•
DC
+5V
•
ICO2D(7805)
Output
•
Replace
ICO2D
(Indoor/Outdoor
unit)
4
•
ICO1A(KIA7036,
Reset
IC)
•
Voltage
of
Micom
No.
2,
(DC
+4.5V
over)
and
Soldering
condition.
•
Replace
faulty
parts
X01(8MHz)
Service
Manual
35