LG GR-642AVP Service Manual ▷ View online
- 17 -
NO.
ITEMS
CONTENTS AND SPECIFICATIONS
REMARKS
WELDING
(1) H 30
ROD
(1)
• Chemical Ingredients
• Recommend H34 containing 34% Ag in the
(1) •
Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20%
•
Service Center.
(1)
• Brazing Temperature: 710~840°C
(2) Bcup-2
(1)
• Chemical Ingredients
(1) •
Cu: About 93%
(1) •
P: 6.8~7.5%
(1) •
The rest: within 0.2%
(1)
• Brazing Temperature: 735~840°C
FLUX
(1)
• Ingredients and how to make
• Make amount for only a day.
( 1 )
(1) ••
Borax 30%
•
Holding period: 1 day
(1) ••
Borax 35%
• Close the cover of container to prevent dust
(1) •
Fluoridation kalium: 35%
•
putting in the FLUX.
(1) •
Water: 4%
• Keep it in a stainless steel container.
(1) •
Mix the above ingredients and boil until
(1) •
they are transformed into liquid.
DRIER
(1) Assemble the drier within 30min.
• Don't keep the drier in a outdoor because
ASM
(1)
after unpacking.
•
humidity damages to it.
(2) Keep the unpacked drier at the temperature
of 80~100°C.
VACUUM
(1) When measuring with pirant Vacuum
• Apply M/C Vacuum Gauge without fail.
(1 )
gauge of charging M/C, vacuum
• Perform vacuum operation until a proper
(1 )
degree is within 1 Torr.
•
vacuum degree is built up.
(2) If the vacuum degree of the cycle inside is
• If a proper vacuum degree isn't built up,
•
(2)
10 Torr. below for low pressure and 20 Torr.
•
check the leakage from
(2)
for high pressure, it says no vacuum
•
the Cycle Pipe line part and
(2)
leakage state.
•
Quick Coupler Connecting part.
(3) Vacuum degree of vacuum pump must be
(3)
0.05 Torr. below after 5 min.
(4) Vacuum degree must be same to the
value described item (2) above for more than
20 min.
20 min.
(1) The pressure of dry air must be more
than 12~16Kg/cm
2
(2) Temperature must be more than
-20~-70°C.
(3) Keep the pressure to 12~6Kg/cm
2
also
(3)
when substituting dry air for Nitrogen Gas.
NIPPLE
(1) Check if gas leaks with soapy water.
• Check if gas leaks from connecting part of
AND
(2) Replace Quick Coupler in case of leakage.
•
Coupler.
COUPLER
PIPE
(1)
• Put all Joint Pipe in a clean box and
(1)•
cover tightly with the lid so that dust or
(1)•
humidity is not inserted.
1
2
3
4
5
6
7
DRY AND
AIR
NITROGEN
GAS
AIR
NITROGEN
GAS
▼
General Control of Refrigerating Cycle
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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.
is poor.
TRANS FUSE open.
TRANS FUSE open.
Replace TRANS.
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
FAN MOTOR is poor
Replace FAN MOTOR.
TEMPERATURE is poor
operates or not.
MAIN PWB once.
DOOR LINE contact.
Replace DOOR LINER.
(forced COOLING)
CONETTING WIRE is poor.
Certify MOTOR and the
connection of the black wire
of MAIN PWB CONNECTOR.
(CON2)
connection of the black 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 RESISTANCE is
Replace SENSOR
SENSOR in the
poor.
Refrigerator
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-
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. 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
REFRIGERATOR
EVA frozen.
See "DEFROSTING is poor".
DEFROSTING is
NO DEFROSTING.
1. HEATER emit heat?
PRESS TEST KEY on MAIN
HEATER disconnection.
Replace HEATER.
poor.
on MAIN PWB three times.
(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 RY5 of MAIN PWB.
2. DRAIN PIPE blocking?
Certify DRAIN PIPE.
DRAIN PIPE blocking.
Remove ice and impurities.
Certify HEATER PLATE
resistance.
3. Remain ice at
Certify the attaching
Attaching 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.
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-
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. 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
REFRIGERATOR
EVA frozen.
See "DEFROSTING is poor".
DEFROSTING is
NO DEFROSTING.
1. HEATER emit heat?
PRESS TEST KEY on MAIN
HEATER disconnection.
Replace HEATER.
poor.
on MAIN PWB three times.
(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 RY5 of MAIN PWB.
2. DRAIN PIPE blocking?
Certify DRAIN PIPE.
DRAIN PIPE blocking.
Remove ice and impurities.
Certify HEATER PLATE
resistance.
3. Remain ice at
Certify the attaching
Attaching 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.