LG GR-642TVPF Service Manual ▷ View online
AIR RECHARGING IN COMPRESSOR
Test the refrigeration system connecting it electrically before
refilling operation. It is necessary to ascertain the function
of the motor-compressor and identify the defects
immediately. If defects have been found, empty the old
system of possible R-12(R134a) residue by breaking off the
end of the extension piece at its narrow point. (Figure 1)
Replace the filter and any damaged components. Unsolder
and pull off the piece remaining inside the service tube and
then attach an complete extension with male Hansen and
at last, solder it to the same tube again. (Figure 2)
refilling operation. It is necessary to ascertain the function
of the motor-compressor and identify the defects
immediately. If defects have been found, empty the old
system of possible R-12(R134a) residue by breaking off the
end of the extension piece at its narrow point. (Figure 1)
Replace the filter and any damaged components. Unsolder
and pull off the piece remaining inside the service tube and
then attach an complete extension with male Hansen and
at last, solder it to the same tube again. (Figure 2)
It is necessary to execute the soldering operation with
valve open so that the fumes caused by oil residue can
come out freely without blowholes between two tubes
during the heating the of the point to be soldered.
The extension fitted with the male Hansen is connected to
the female fitting of the vacuum pump tube. (Figure 3)
valve open so that the fumes caused by oil residue can
come out freely without blowholes between two tubes
during the heating the of the point to be soldered.
The extension fitted with the male Hansen is connected to
the female fitting of the vacuum pump tube. (Figure 3)
Air evacuating from the system begins as soon as the
pump starts. The refrigeration system must be kept under
vacuum until the reading on the low-pressure gauge
indicates vacuum (0 absolute, -1 atm., -760 mm hg) in any
case it is advisable to keep the pump running for about 30
minutes. (Figure 3)
In case that a considerable leakage occurs it will be
necessary to stop the vacuum pump and to add asmall
quantity of Freon to the system, if vacuum should not be
obtained (pressure gauge can't fall to 1 atmosphere), start
the refrigeration unit and find the leakage with the special
leak-finder. When the defective soldering point is visible,
re-do it after opening the extension tube valve and
reestablishing the normal outside pressure inside the
group.
Because the melted alloy is sucked into the tubes and
block them, the pressure must be rebalanced when
vacuum is in the system in soldering. As soon as the
pump starts. The refrigeration system must be kept under
vacuum until the reading on the low-pressure gauge
indicates vacuum (0 absolute, -1 atm., -760 mm hg) in any
case it is advisable to keep the pump running for about 30
minutes. (Figure 3)
In case that a considerable leakage occurs it will be
necessary to stop the vacuum pump and to add asmall
quantity of Freon to the system, if vacuum should not be
obtained (pressure gauge can't fall to 1 atmosphere), start
the refrigeration unit and find the leakage with the special
leak-finder. When the defective soldering point is visible,
re-do it after opening the extension tube valve and
reestablishing the normal outside pressure inside the
group.
Because the melted alloy is sucked into the tubes and
block them, the pressure must be rebalanced when
vacuum is in the system in soldering. As soon as the
vacuum operation is over, add the quantity in grams of
R-12(R134a) to the refrigeration system. Remember that
every system has an exact quantity of R-12(R134a) with a
tolerance of ±5 grams that can be added. (Figure 4)
R-12(R134a) to the refrigeration system. Remember that
every system has an exact quantity of R-12(R134a) with a
tolerance of ±5 grams that can be added. (Figure 4)
Before performing this operation (if the vacuum pump and
refilling cylinder are connected), make sure that the valve
placed between the vacuum pump and the refilling tube are
closed in order to keep the Freon for addition to the system.
(Figure 5)
refilling cylinder are connected), make sure that the valve
placed between the vacuum pump and the refilling tube are
closed in order to keep the Freon for addition to the system.
(Figure 5)
In addition, check the graduated scale on the cylinder for
the quantity of R-12(R134a) to be added, for example, if we
have 750 grams of Freon in the cylinder and must add 165
grams to the group, this amount will be reached when
R-12(R134a) has dropped to 585 grams, remembering that
the indicator shows a lower limit of meniscus. Do this after
choosing the scale corresponding to the gas pressure
different scales reported as the same gas pressure
indicated by the pressure gauge on the top of the column.
To make R-12(R134a) flow into the system, open the valve
placed at the base of the cylinder and connected to the
filling tube. The amount of Freon cannot be added to the
system all at once because it may cause a blocking of motor-
compressor. Therefore, proceed by adding the original
quantity of about 20-30 grams and close the valve
immediately.
The pressure rises and the motor compressor must start
sucking the gas and lowering the pressure again. Regulate
the valve again, maintaining the same manner until
reaching to the quantity of R-12(R134a) established for the
system being charged. When the system is running, the
suction pressure must be stabilized between 0.30 to
0.6(0.10 to 0.4) atmosphere.
the quantity of R-12(R134a) to be added, for example, if we
have 750 grams of Freon in the cylinder and must add 165
grams to the group, this amount will be reached when
R-12(R134a) has dropped to 585 grams, remembering that
the indicator shows a lower limit of meniscus. Do this after
choosing the scale corresponding to the gas pressure
different scales reported as the same gas pressure
indicated by the pressure gauge on the top of the column.
To make R-12(R134a) flow into the system, open the valve
placed at the base of the cylinder and connected to the
filling tube. The amount of Freon cannot be added to the
system all at once because it may cause a blocking of motor-
compressor. Therefore, proceed by adding the original
quantity of about 20-30 grams and close the valve
immediately.
The pressure rises and the motor compressor must start
sucking the gas and lowering the pressure again. Regulate
the valve again, maintaining the same manner until
reaching to the quantity of R-12(R134a) established for the
system being charged. When the system is running, the
suction pressure must be stabilized between 0.30 to
0.6(0.10 to 0.4) atmosphere.
SERVICING PRECAUTIONS
- 3 -
POINT TO BE BROKEN
SERVICE TUBE EXTENSION
CHARGE TUBE
EXTENSION
EXTENSION
FEMALE
HANSEN
HANSEN
MALE HANSEN
SOLDERING POINT
Figure 1
Figure 2
TO THE
VACUUM
PUMP
VACUUM
PUMP
PRESSURE
GAUGE
GAUGE
Figure 3
TO THE R-12(R134a) CYLINDER
TO THE REFRIGERATION
SYSTEM
SYSTEM
Figure 4
FILLING OR
CHARGE TUBE
CHARGE TUBE
VALVE TO BE OPENED
WHEN REFILLING
WHEN REFILLING
VALVE TO BE CLOSED
AFTER VACUUM
AFTER VACUUM
TO THE CHARGE
CYLINDER
CYLINDER
TO THE REFRIGERATION
SYSTEM
SYSTEM
TO THE
VACUUM
PUMP
VACUUM
PUMP
Figure 5
- 33
-
7-4. TRUBLE SHOOTING
• Replace PCB when no trouble after checking the contents of trouble.
CLASSIFICATION
STATE OF TROUBLE
POINT BE CHECKED
CHECKING METHOD
CONTENT
REMEDY
POWER SOURCE
1. All the DISPLAY
1. FREEZER/
FREEZER/REFRIGERATOR
POWER SOURCE is poor
Certify Fuse.
is poor
LED OFF
REFRIGERATOR
DOOR OPEN
Certify outlet Voltage.
2. DISPLAY LED
2. LAMP is dim.
CHECK with the naked.
Applied voltage mistake
Use boosting TRANS.
represents abnormal
3. The connection of
Certify connection of
CONNECTOR connection
Reconnect CONNECTOR.
operation.
CONNECTOR of MAIN PWB. CONNECTOR.
connection is poor.
TRANS FUSE open.
TRANS FUSE open.
Replace TRANS.
4. The conncetion of
Certify connection of
CONNECTOR
Reconnect CONNECTOR.
CONNECTOR of UPPER
of CONNECTOR
connection is poor.
UPPER HINGE PART
Certify connection of
is poor.
of DISPLAY PCB
COOLING is poor
NO COOLING
1. COMPRESSOR operates?
PRESS TEST KEY on MAIN
COMPRESSOR lock or
Replace COMPRESSOR.
PWB once. (forced COOLING)
blocked.
•If pass less than 7 minutes
OLP, PTC is poor.
Replace OLP, PTC.
after stop of COMP, don't
COMPRESSOR RELAY IS
Replace MAIN PWB RY1
press it and stand-by.
poor
THE CONNECTING WIRE
THE CONNECTING WIRE
Certify the black wire of MAIN
is poor.
PWB CONNECTOR (CON2)
2. Whether refrigerant leaks or
Measure the amount of frost
Refrigerant leakage.
Remedy the leaking part
leaks or not.
sticking on EVA and the
and reaching Refrigerant.
surface temperature of
condenser pipe.
condenser pipe.
FREEZER
1. Whether FAN MOTOR
PRESS TEST KEY on
DOOR S/W is poor.
Replace DOOR S/W.
TEMPERATURE is poor
operates or not.
MAIN PWB once.
FAN MOTOR is poor
Replace FAN MOTOR.
(force COOLING)
DOOR LINE contact.
Replace DOOR LINER.
CONETTING WIRE is poor.
Certify MOTOR and the
connection of the white wire
of MAIN PWB CONNECTOR.
(CON2)
connection of the white wire
of MAIN PWB CONNECTOR.
(CON2)
2. DEFROSTING normal?
Certify the amount of frost
DEFROSTING is poor.
See the DEFROSTING
sticking on EVA.
trouble.
3. SENSOR normal?
Check resistance the
SENSOR REGISTANCE is
Recplace SENSOR
SENSOR in the FREEZER
poor.
CONTROL BOX-F
- 34
-
CLASSIFICATION
STATE OF TROUBLE
POINT BE CHECKED
CHECKING METHOD
CONTENT
REMEDY
COOLING is poor.
REFRIGERATOR
1. FREEZER TEMPERATURE
See "FREEZER
Certify the attaching state
TEMPERATURE is
is normal?
TEMPERATURE is poor".
of DOOR.
poor.
2. DAMPER normal?
Check DAMPER.
DAMPER is poor.
Replace DAMPER.
3. DAMPER normal?
Damper is opened and
DAMPER FREEZING.
Replace the DAMPER and
closed once and opened
and seal the leaking part of
again when pressing the
part of cold air.
TEST KEY once on the
DAMPER is poor.
Replace the DAMPER.
MAIN PWB.
(resistance)
Connection is poor.
Certify the connection of
connector of DAMPER ASM
and MAIN PWB.
REED S/W is poor.
Certify the connection and
remedy.
Replace the DAMPER.
4. Cool air of FAN MOTOR is
Certify the amount of cool air
FAN MOTOR is poor.
Replace FAN MOTOR.
is sufficient?
and its speed touching check
Passage of cool air blocking.
Remove impurities.
supplied into
(DUCT part)
REFRIGERATOR while
EVA frozen.
See "DEFROSTING is poor".
DAMPER opens.
5. Damper assembling is
Certify the leakage of cool
Cool air leakage.
Leaking part SEALING.
normal?
air from DAMPER.
REFRIGERATOR
1. DAMPER assembling is
Certify the leakage of cool
Cool air leakage.
Leaking part SEALING.
freezes.
poor?
air from DAMPER.
2. DAMPER normal?
See "Damper normal?" in
"REFRIGERATOR
temperature is poor".
- 35
-
CLASSIFICATION
STATE OF TROUBLE
POINT BE CHECKED
CHECKING METHOD
CONTENT
REMEDY
DEFROSTING is
NO DEFROSTING.
1. HEATER emit heat?
PRESS TEST KEY on MAIN
HEATER disconnection.
Replace HEATER.
poor.
on MAIN PWB twice.
(forced DEFROSTING)
TEMPERATURE FUSE
Replace TEMPERATURE
disconnection.
FUSE.
Connection is poor.
Certify EVA connection and
wire of MAIN PWB
CONNECTOR
DEF-SENSOR is poor.
Replace DEF-SENSOR.
HEATER RELAY is poor.
Replace RY4 of MAIN PWB.
2. DRAIN PIPE blocking?
Ceritify DRAIN PIPE.
DRAIN PIPE bloking.
Remove ice and impurities.
Certify HEATER PLATE
resistance.
3. Remain ice at
Certify the attaching
Attraching is poor.
Reassemble DEF-SENSOR.
DEFROSTING?
of DEF-SENSOR.
Certify the attaching
DOOR sticking is poor.
Reassemble DOOR.
state(gap) of FREEZER/
Replace GASKET.
REFRIGERATOR DOOR.
DISPENSER is
NO PUMPING
1. PUMP MOTOR doesn't
Certify that the Voltage of
PUMP MOTOR is poor
Check the PUMP MOTOR
poor.
operate?
the PUMP MOTOR when
and the connection of it.
PUMP SWITH is pushed
is 12V
2. The connection of PUMP
Check the connection.
Connection is poor
Check the connection.
SWITCH is poor?
The connection of
Replace PUMP SWITCH.
PUMP SWITCH is poor.
3. MAIN PWB is poor?
After pushing the PUMP
MAIN PWB is poor.
Replace MAIN PWB.
SWITCH, check the PWB.
PUMP MOTOR don't
1. The conncetion of PUMP
Check the connection of
PUMP SWITCH is short.
Reassemble the connnection
stop.
SWITCH is poor?
PUMP SWITCH.
of PUMP SWITCH.
2. MAIN PWB is poor?
Check the voltage of CON6
MAIN PWB is poor.
Replace MAIN PWB.
on MAIN PWB.