LG GA-449 Service Manual ▷ View online
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u
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GA-479**Q*/449**Q*
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GA-479**C*/449**C*
1. COMPRESSOR AND ELECTRIC COMPONENTS
TROUBLESHOOTING (Mechanical Part)
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1
2
3
4
5
2
5
5
3
4
5
5
1
4
3
YES
YES
NO
YES
YES
NO
NO
5
YES
NO
YES
Power
Source.
Source.
Remove the Relay
Assembly from the
Compressor and
measure the voltage
between Terminal C of
Compressor and
Terminals M or S of Relay
Assembly
Assembly from the
Compressor and
measure the voltage
between Terminal C of
Compressor and
Terminals M or S of Relay
Assembly
No Voltage.
(Rating Voltage
±10%)?
±10%)?
Replace
Relay Assembly
Relay Assembly
Replace
Relay Assembly
Relay Assembly
O.K.
Advise the customer
to use a regular
Trans.
to use a regular
Trans.
Replace Compressor.
OLP works within
30 sec. in forcible
OLP operation by
turning instant power
on and off.
30 sec. in forcible
OLP operation by
turning instant power
on and off.
Components start in
the voltage of Rating
Voltage ±10% below.
the voltage of Rating
Voltage ±10% below.
Applied voltage isn't
in the range of Rating
Voltage ±10%.
in the range of Rating
Voltage ±10%.
Check the resistance
among M-C, S-C and
M-S in Motor
Compressor.
among M-C, S-C and
M-S in Motor
Compressor.
Check the resistance of
two terminals in PTC-
Starter.
two terminals in PTC-
Starter.
Check if applying
a regular OLP.
a regular OLP.
Measure minimum
starting voltage after 5
min. for balancing cycle
pressure and cooling the
PTC.
starting voltage after 5
min. for balancing cycle
pressure and cooling the
PTC.
Check the
resistance of
Motor
Compressor.
resistance of
Motor
Compressor.
Check the
resistance of
PTC-Starter.
resistance of
PTC-Starter.
Check OLP.
Check
starting state.
starting state.
2. RELAY ASSEMBLY (PTC AND OLP)
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L
N
T
3
2
2
M
C
S
M
C
S
YES
NO
Normal operation of
Compressor is
impossible or poor.
Compressor is
impossible or poor.
Separate the Relay
Assembly from
Compressor and measure
the resistance between M
and S with a Tester or
Whistone Bridge.
(Figure 21)
Assembly from
Compressor and measure
the resistance between M
and S with a Tester or
Whistone Bridge.
(Figure 21)
Separate the Relay
Assembly from the
Compressor and check the
resistance value between
two terminals of OLP with a
Tester. (Figure 22)
Assembly from the
Compressor and check the
resistance value between
two terminals of OLP with a
Tester. (Figure 22)
Observation value is
220V/50Hz : 22
220V/50Hz : 22
Ω±30%
115V/60Hz : 6.8
Ω±30%
240V/50Hz : 33
Ω±30%
127, 220V/60Hz :
22
22
Ω±30%
The resistance value is 0
or serveral hundreds
or serveral hundreds
Ω.
The value is
∞.
Check another
electric components.
electric components.
Replace Relay
Assembly.
Assembly.
Check another
electric
components.
electric
components.
Replace
Relay Assembly.
Relay Assembly.
Figure 21
Figure 22
3. ANOTHER ELECTRIC COMPONENTS
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▼ Cooling is impossible
Compressor
doesn't run.
doesn't run.
Running state of
Compressor is poor.
Compressor is poor.
Check a starting
voltage.
voltage.
Check if current flows to
the following
components.
the following
components.
a. Thermistor
b. Starting devices
c. OLP
d. Compressor coil
e. Circuit Parts
Low voltage.
Poor contacting.
Shorted or broken.
Poor contacting
or shorted.
or shorted.
Coil shorted.
Poor contacting
or shorted.
or shorted.
Poor contacting
and broken.
and broken.
Shorted.
Lack of capacity.
Coil of motor
Compressor.
Compressor.
Replace
the compressor.
the compressor.
Replace
each component.
each component.
Raise the voltage.
Replace
each component.
each component.
Cause.
Check if current flows
to starting devices.
to starting devices.
Check current flowing
in sub-coil of
Compressor.
in sub-coil of
Compressor.
Check capacity of OLP.
The items described
above are normal.
above are normal.
▼ Cooling ability is poor
Fan motor
doesn't run.
doesn't run.
Poor contacting.
Coil is shorted.
Replace
each component.
each component.
Check current flowing
in SWITCH, DOOR.
in SWITCH, DOOR.
Check current flowing in the
MOTOR[MECH], FAN.
MOTOR[MECH], FAN.
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