LG GR-372SF Service Manual ▷ View online
5
Move the Position of Adjustable Screw
Assembly
Assembly
➐
.
7
Move the Cap
➑
, Bracket
➒
of the Refrigerator
Door.
9
Assembe the Door Stopper-F
é
for Right
Opening Type.
11
Move the Pin Position
ê
of the Hinge Upper.
6
Assemble the Hinge Lower
➏
.
8
Move the Cap
➓
and Assemble the Hinge-C
➍
.
After removing the washer.
10
Move the Cap
è
and Assemble the Freezer
Door
➌
.
12
Assemble the Hinge Upper
➋
and the Cap
➊
.
- 9 -
7
9
8
11
3
13
2
1
3
12
5
4
10
6
4-1 COMPRESSOR
4-1-1 Role
The compressor inhales low temperature and low pressure
gas evaporated from Evaporator of the Refrigerator, and
condenses this gas to high temperature and high pressure
gas, and then plays delivering role to Condenser.
gas evaporated from Evaporator of the Refrigerator, and
condenses this gas to high temperature and high pressure
gas, and then plays delivering role to Condenser.
4-1-2 Composition
The Compressor is Composed of Compressor Apparatus
compressing gas, Compressor Motor moving Compressor
Apparatus and Case protecting Compressor Apparatus
and Motor. There are PTC-Starter, and Over Load
Protector (OLP) in the Compressor outside. On the other
hand, because the Compressor consists of 1/1000mm processing
precision components and is sealed after producing without dust
or humidity, deal and repair with care.
The Compressor is Composed of Compressor Apparatus
compressing gas, Compressor Motor moving Compressor
Apparatus and Case protecting Compressor Apparatus
and Motor. There are PTC-Starter, and Over Load
Protector (OLP) in the Compressor outside. On the other
hand, because the Compressor consists of 1/1000mm processing
precision components and is sealed after producing without dust
or humidity, deal and repair with care.
4-1-3 Note to Use
(1) Be careful not to allow over-voltage and over-current.
(2) No Strike
(1) Be careful not to allow over-voltage and over-current.
(2) No Strike
If applying forcible power or strike (dropping or careless
dealing), poor operation and noise may occur.
dealing), poor operation and noise may occur.
(3) Use proper electric components appropriate to the
Compressor.
(4) Note to Keep Compressor.
If Compressor gets wet in the rain and rust in the pin of
Hermetic Terminal, poor operation and poor contact
may cause.
Hermetic Terminal, poor operation and poor contact
may cause.
(5) Be careful that dust, humidity, and flux due to welding
don't inflow in Compressor inside in replacing
Compressor. Dust, humidity, and flux due to welding
which inflows to Cylinder may cause lock and noise.
Compressor. Dust, humidity, and flux due to welding
which inflows to Cylinder may cause lock and noise.
4-2 PTC-STARTER
4-2-1 Composition of PTC-Starter
(1) PTC (Positive Temperature Coefficient) is no-contact
(1) PTC (Positive Temperature Coefficient) is no-contact
semiconductor starting device which uses ceramic
material and the material consists of BaTiO
material and the material consists of BaTiO
3
.
(2) The higher the temperature is, the higher resistance
value becomes . These features are used as starting
device of Motor.
device of Motor.
4-2-2 Role of PTC-Starter
(1) PTC is attached to Hermetic Compressor used for
(1) PTC is attached to Hermetic Compressor used for
Refrigerator, Show Case and starts Motor.
(2) Compressor for household refrigerator applies single-
phase induction Motor.
For normal operation of single-phase induction motor, in
the starting operation flows in both main coil and sub-
coil. After the starting is over, the current is cut off in
subcoil. The proper features of PTC play the above all
roles. So, PTC is used as a starting device of motor.
For normal operation of single-phase induction motor, in
the starting operation flows in both main coil and sub-
coil. After the starting is over, the current is cut off in
subcoil. The proper features of PTC play the above all
roles. So, PTC is used as a starting device of motor.
4-2-3 PTC-Applied Circuit Diagram
●
According to Starting Method of Motor
4-2-4 Motor Restarting and PTC Cooling
(1) For restarting after power off during normal
(1) For restarting after power off during normal
Compressor Motor operation, plug the power cord after
5 min. for pressure balance of Refrigerating Cycle and
PTC cooling.
5 min. for pressure balance of Refrigerating Cycle and
PTC cooling.
(2) During normal operation of Compressor Motor, PTC
elements generate heat continuously. Therefore,
if PTC isn't cooled for a while after power off, Motor
can't operate again.
if PTC isn't cooled for a while after power off, Motor
can't operate again.
4-2-5 Relation of PTC-Starter and OLP
(1) If power off during operation of Compressor and power
(1) If power off during operation of Compressor and power
on before PTC is cooled, (instant shut-off within 2 min.
or reconnect a power plug due to misconnecting),
PTC isn't cooled and a resistance value grows. As a
result, current can't flow to the sub-coil and Motor can't
operate and OLP operates by flowing over current in
only main-coil.
or reconnect a power plug due to misconnecting),
PTC isn't cooled and a resistance value grows. As a
result, current can't flow to the sub-coil and Motor can't
operate and OLP operates by flowing over current in
only main-coil.
(2) While the OLP repeats on and off operation about 3-5
times, PTC is cooled and Compressor Motor performs
normal operation.
If OLP doesn't operate when PTC is not cooled,
Compressor Motor is worn away and causes circuit-
short and fire. Therefore, use a proper fixed OLP
without fail.
normal operation.
If OLP doesn't operate when PTC is not cooled,
Compressor Motor is worn away and causes circuit-
short and fire. Therefore, use a proper fixed OLP
without fail.
4-2-6 Note to Use PTC-Starter
(1) Be careful not to allow over-voltage and over-current.
(2) No Strike
(1) Be careful not to allow over-voltage and over-current.
(2) No Strike
Don't apply a forcible power or strike.
(3) Keep apart from any liquid.
If liquid such as oil or water inflows into PTC,
PTC materials it may break due to insulation breakdown
of material itself.
PTC materials it may break due to insulation breakdown
of material itself.
(4) Don't change PTC at your convenience.
Don't disassemble PTC and mold. If damaging to
outside of PTC-starter, resistance value alters and poor
starting of compressor motor may cause.
outside of PTC-starter, resistance value alters and poor
starting of compressor motor may cause.
(5) Use a properly fixed PTC.
4. ADJUSTMENT
- 10 -
PTC STARTER
HERMETIC
TERMINAL
COMPRESSOR
MOTOR
MOTOR
C
M
S
M
3
6
5
S
PTC
OVERLOAD PROTECTOR
RSIR
4-3 OLP (OVER LOAD PROTECTOR)
4-3-1 Definition of OLP
(1) OLP (OVER LOAD PROTECTOR) is attached to
(1) OLP (OVER LOAD PROTECTOR) is attached to
Hermetic Compressor and protects Motor by cutting off
current in Compressor Motor by Bimetal in the OLP in
case of over-rising temperature.
current in Compressor Motor by Bimetal in the OLP in
case of over-rising temperature.
(2) When over-voltage flows to Compressor motor, Bimetal
works by heating the heater inside OLP,
and OLP protects Motor by cutting off current which
flows to Compressor Motor.
and OLP protects Motor by cutting off current which
flows to Compressor Motor.
4-3-2 Role of OLP
(1) OLP is attached to Hermetic Compressor used to
(1) OLP is attached to Hermetic Compressor used to
Refrigerator and Show Case and prevents Motor Coil
from being started in the Compressor.
from being started in the Compressor.
(2) Do not turn the Adjust Screw of OLP in any way for
normal operation of OLP.
(Composition and connection Diagram of OLP
(Composition and connection Diagram of OLP
5. CIRCUIT DIAGRAM
- 11 -
CONTACTING
POINT
POINT
COVER
BIMETAL
CONTACTING
POINT
POINT
HEATER
TERMINALS
ADJUST
SCREW
SCREW
HEATER
BIMETAL
Figure 21
NOTE : 1. This is a basic diagram and specifications vary in different localities.
3
4
BK
COMP -
RESSOR
RESSOR
CAPACITOR PART P.T.C STARTER
GN
(GN/YL)
(GN/YL)
DOOR S/W-R
BK
BK
BK
BK
BK
BK
BK
F.I.R
LAMP
LAMP
F.I.R
LAMP
F.I.R PART
FUSE PART
COMP' EARTH
YL
(250V/15A)
PR
YL
YL
GY
BK
BN
BO
WH
(A)
(B)
WH
WH
DEFROST. TIMER
THERMOSTAT
BL
BL
RD
RD
BL
RD
RD
BL
PK
BL
BL
BL
BL
OVER LOAD
PROTECTOR
LAMP-R
FUSE-M(72 C
)
FAN MOTOR
RESISTOR
COOLING
FAN MOTOR
L-CORD HEATER
TE-PLATE HEATER
CAPACITOR
F/L
POWER SUPPLY
CORD
CAPACITOR-S
DEF-THERMO
CAPACITOR-R
6
5
2
3
1
4
2
S
C
M
T
WH : WHITE : PINK
BK : BLACK OW
BO : BRIGHT ORANGE GREEN
3854JD1020B
F.I.R PART CAN BE APPLIED BY THE
REQUEST OF BUYERS.
CAPACITORS, THE PLUG TYPE,
AND COMP' EARTH PART ON CIRCUIT
DIAGRAM ARE SUBJECT TO CHANGE IN
DIFFERENT LOCALITIES.
IF THERE IS NO CAPACITOR-S,
CIRCUIT BETWEEN TERMINAL 3 AND 4 OF
P.T.C STARTER PART WILL BE SHORT
INTERNALLY.
REQUEST OF BUYERS.
CAPACITORS, THE PLUG TYPE,
AND COMP' EARTH PART ON CIRCUIT
DIAGRAM ARE SUBJECT TO CHANGE IN
DIFFERENT LOCALITIES.
IF THERE IS NO CAPACITOR-S,
CIRCUIT BETWEEN TERMINAL 3 AND 4 OF
P.T.C STARTER PART WILL BE SHORT
INTERNALLY.
FUSE & F.I.R SPECIFICATION
NON FUSE
100V ~ 127V
250V 15A
(B)
(A)
250V 9A
200V ~ 240V
FUSE
ITEM
RATING
220V ~ 240V
50Hz
60Hz
60Hz
300VAC, 0.33uF
300VAC, 0.27uF
300VAC, 0.27uF
F.I.R
CAPACITOR
CAPACITOR
F.I.R
F.I.R LAMP'S CAPACITOR SPECIFICATION
CIRCUIT DIAGRAM
M
C/F
(250V/9A)
- 12 -
6-1 COMPRESSOR AND ELECTRIC COMPONENTS
6. TROUBLESHOOTING
1
2
3
4
5
2
5
5
3
5
4
5
5
1
4
3
YES
YES
YES
YES
NO
NO
YES
YES
YES
NO
NO
NO
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.
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.
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