LG GR-322W Service Manual ▷ View online
6-1 COMPRESSOR AND ELECTRIC COMPONENTS
6. TROUBLESHOOTING
- 10 -
1
2
3
4
5
2
5
5
3
4
5
5
1
4
3
YES
YES
YES
NO
YES
YES
NO
NO
5
YES
NO
YES
Power Source.
Remove the PTC-
Starter from the
Compressor and
measure the voltage
between Terminal C of
Compressor and
Terminals 5 or 6 of PTC.
Starter from the
Compressor and
measure the voltage
between Terminal C of
Compressor and
Terminals 5 or 6 of PTC.
No Voltage.
(Rating Voltage
±10%)?
±10%)?
Replace OLP.
Reconnect.
Replace
PTC-Starter.
PTC-Starter.
Replace OLP.
O.K.
Check connection
condition.
condition.
OLP disconnected?
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.
of 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.
6-2 PTC AND OLP
- 11 -
6
5
YES
NO
Normal operation of
Compressor is
impossible or poor.
Compressor is
impossible or poor.
Separate the PTC from
Compressor and
measure the
resistance between
No. 5 and 6 of PTC
with a Tester or
Whistone Bridge.
(Figure 23)
Compressor and
measure the
resistance between
No. 5 and 6 of PTC
with a Tester or
Whistone Bridge.
(Figure 23)
Separate the OLP from
Compressor and check
resistance value
between two terminals
of OLP with a Tester.
(Figure 24)
Compressor and check
resistance value
between two terminals
of OLP with a Tester.
(Figure 24)
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
Ω
±30%
The resistance
value is
0 or several
hundreds
value is
0 or several
hundreds
Ω
.
The value is
∞
.
Check another
electric components.
electric components.
Replace OLP.
Check another
electric components.
electric components.
Replace
PTC.
PTC.
Figure 23
Figure 24
6-3 DEFROST TIMER
- 12 -
NO
Cam Shaft
NO
YES
Normal operation of
the Defrost Timer is
impossible.
the Defrost Timer is
impossible.
No defrosting.
Poor cooling.
Position the Cam Shaft
to the point of first "click"
sound and check the
current between terminals
No. 1(brown) and
No. 2(bright orange).
Next, position the Cam
Shaft to the point of
second "click" sound and
check the current flowing
between terminals
No. 1(brown) and
No. 4(black).
(Figure 25).
to the point of first "click"
sound and check the
current between terminals
No. 1(brown) and
No. 2(bright orange).
Next, position the Cam
Shaft to the point of
second "click" sound and
check the current flowing
between terminals
No. 1(brown) and
No. 4(black).
(Figure 25).
Turn the Cam Shaft.
Shake about 3 times
with holding the Cam
Shaft and Body softly.
with holding the Cam
Shaft and Body softly.
The resistance is
∞
The resistance is
0
0
Ω
or variable.
The resistance is about
220V/50Hz : 20K
220V/50Hz : 20K
Ω
115V/60Hz : 7.8K
Ω
Loud "click" sound.
Replace the
Defrost Timer.
Defrost Timer.
Replace the
Defrost Timer.
Defrost Timer.
Check the other
electric components.
electric components.
Replace the
Defrost Timer.
Defrost Timer.
Replace the
Defrost Timer.
Defrost Timer.
Figure 25
6-4 ANOTHER ELECTRIC COMPONENTS
▼
Cooling is impossible
- 13 -
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. Thermostat
b. Starting devices
c. OLP
d. Compressor coil
e. Defrost Timer
f. Circuit parts
Low voltage.
Poor contacting and
gas leakage.
Shorted or broken.
gas leakage.
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.
Much frost are sticked
to the EVAPORATOR.
to the EVAPORATOR.
Poor contacting.
Coil is shorted.
Shorted.
Replace
each component.
each component.
Replace
each component.
each component.
Replace
each component.
each component.
Running is poor.
(Coil is shorted.)
(Coil is shorted.)
Check current flowing
of the door S/W.
of the door S/W.
Check current flowing
in the Fan Motor.
in the Fan Motor.
Check the running
condition of Timer.
condition of Timer.
Check current flowing
of the following
components.
• Control DEF. ASM
of the following
components.
• Control DEF. ASM
Check current flowing
of the following
components.
• L-Cord
• TE-Plate Heater
of the following
components.
• L-Cord
• TE-Plate Heater
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