LG LRBP1031NI User Manual REFRIGERATOR Manuals And Guides L0301004

LG Bottom Mount Refrigerator Manual L0301004 LG Bottom Mount Refrigerator Owner's Manual, LG Bottom Mount Refrigerator installation guides

User Manual: LG LRBP1031NI LRBP1031NI LG REFRIGERATOR - Manuals and Guides View the owners manual for your LG REFRIGERATOR #LRBP1031NI. Home:Kitchen Appliance Parts:LG Parts:LG REFRIGERATOR Manual

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SERVICING

PRECAUTIONS
vacuum operation is over, add the quantity in grams of
R134a to the refrigeration system. Remember that every
system has an exact quantity of R134a with a tolerance of
+5 grams that can be added. (Figure 4)

Air Recharging
in Compressor
Test the refrigeration by connecting it electrically before
refilling operation. It is necessary to ascertain the function
of the meter-compressor and identify the defects
immediately. If defects have been found, empty the old
system of possible 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
solder it to the same tube again. (Figure 2)
POINT TO BE
BROKEN

CHARGE TUBE
EXTENSION
q\

TO TiE R134a CYLINDER

'__

TOsTTHEEMR
EFRiGEF
_lr_

MALE HANSEN
SERVICE TUBE EXTENSION
Figure

SOLDERING

Figure

POINT

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)

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 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)

FILLING OR
CHARGE TUBE

VALVE TO BE OPENED
WHEN REFILLING

TO THE REFRIGERATION
SYSTEM

TO THE CHARGE
CYLINDER

VALVE TO BE CLOSED
AFTER VACUUM

UM
TO THE VACUUM
PRESSURE
GAUGE

igure

PUMP

Figure 5

In addition, check the graduated scale on the cylinder for
the quantity of 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 R134a has dropped to 585 grams, remembering that the
indicator shows a lower limit of meniscus. De 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 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
the 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, in the safe way until reaching the
quantity of R134a established for the system being
charged. When the system is running, the suction pressure
must be stabilized between 0.30 to 0.6 atmosphere.

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 vaccum pump and to add a small
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
blocks them, the pressure must be rebalanced when
vacuum is in the system in soldering. As soon as the

-3-

98.12.04 80/120

CIRCUIT DIAGRAM
DISPLAY

CONI_OL

P_.B

PWBASSY,MAIN

]

- T,4E PLL_ 1YP_
P_PAGITGR pAqT,
CCM=REgSOR _F_,4
pi_T ONClRCUrr
g_l
,_E PJJB,
IECr
TO CP_NQE IN BFFEFfS_T
LOC_JT E8 AN DP_CO RDAk_E
wr_ MOOEL_tPE
. W_EN 6TARTMS ce,aJcrrcR
_sNOT LetuP, MC_4 _ PTC
START ISCONNE,_TED
_rTERNALLy

C,_PA_m3_

p,TJC

E_Rm P/_T

3854JD1026A
BK:BLACK

BN:BROWN RD:RED

YL:YB.LOW GN,GREB_ BL:BLUE
SB:SKY
BLUE PK:PINK

BO:BRIGHT
ORANGE
PR:PURPLE GY:GRAY

GF_.:GREEN/YELLOW

WH:WHITE

WH_K.'WHITF.._LACK

PARTS IDENTIFICATION

Freezer Temperature _
Control

or 2)

Removable
Glass Shelf(2 or 3)

Door Basket
(3 or 5)

Lam
Multi-air Flow
Fresh Meat Kee
(Optional)

Utility Comer
(movable)

Temperature Control

Used to keep fruits
and vegetables, etc.
fresh and crisp.

Bottle Holder

-2J_ Bottle
Door Basket

Compartment

Plinth
Screw

NOTE : This is a basic model. The shape of refrigerator is subject to change.

-5-

REPLACEMENT

OF DOOR OPENING TYPE

1. PRECAUTION

2) Separating screw @ and remove the center hinge @
and the refrigerator door @. Move the position of cap@.

1) Before reversing the door, first of all, you should take
out food and accessories like shelves or trays which are
not fixed in the refrigerator.
2) Use Torque Wrench or Spanner to fix or remove the
bolt.

3) Move the position of upper hinge pin @, and cap @.
Assemble the refrigerator door @. Assemble center
hinge @ and bolt @, Assemble freezer door @,
Assemble the lower hinge @, bolt O and lower cover 0.

3) Don't lay the refrigerator down in working with it, it will
cause to get out of order,
4) Be careful not to drop the door in disassembling or
assembling the freezer or the refrigerator door.
2. HOW TO REVERSE

THE DOORS

1) Seperate screw O and remove lower cover O and move
cap lower cover 0. And, seperate screw O, lower hinge
!_, and remove pin O. Separating the freezer door @ in
opening, and more the position the cap I@.

-6-

DISASSEMBLY
1 DOOR
• Freezer
1) Loosen
2) Loosen
body to

2 DOOR
Door
2 screws and pull the Lower Cover.
hexagonal bolts fixing the lower hinge to the
remove the freezer door only.

SWITCH

1) Loosen four screws in upper part and disconnect top
cover.
2) Disconnect Lead Wire from switch.
3) Disengage hook behind the switch by pressing it with
hands.

Lower Hinge

Figure

3) Pull out the Door Gasket to remover from the
Door Foam Assy, F.

Figure

3 REFRIGERATOR

ROOM

LAMP

1) Remove the Cover Lamp, R by pulling with a '-' type
driver.

GASKET

2) Remove the Lamp by turning.

Figure 7

• Refrigerator Door
1) Loosen hexagonal bolts fixing the center hinge(Hinge,C)
to the body to remove the refrigerator door only.
Figure

e,C

Figure 8

2) Pull out the Door Gasket to remove from the
Door Foam Assy, R.

-7-

4 FAN AND

FAN MOTOR

6 DAMPER

1) Remove the Cover Lamp, R and loosen 2 screw.
2) Pull the Control Box, R and separate the lead wire
housing.
3) Remove the Cover Lamp, R.
4) Separate the Insulation Multi Duct and Control Box, R.
5) Disassemble the Knob.

1) Remove freezer drawers.
2)
3)
4)
5)
6)
7)

CONTROL

Remove two cap, screws and loosen two screws in Grille Fan.
Pull out the Grille Fan and Shroud, R
Disconnect the housing of lead wire.
Separate the Fan Assy.
Losse 2 screw fixed to the Bracket.
Pull out Shroud, F remove the Fan Motor Assy.

6) Separate the Damper Control and Control Box, R.
7) Separate the Damper Control and Resistor.

8) Separate the Motor Bracket and Rubber.

8) Disconnect the lead wire.
REFRIGERATOR

FAN MOTOR

_L3-_
_,"_k
5 DEFROST

GRILLE

"',

CONTROL

ROOM LAMP

Figure

ASSY

Defrost Control Assy consists of Thermistor and Fuse, Melting.
Thermistor functions to defrost automatically and it is attached to
metal side of the Evaporator and senses temperature,
Fuse, Melting is a kind of safety device for preventing overheating
of the Heater when defrosting,
At the temperature of 72°C, it stops the emission of heat from the
Heater,

7 HEATER,

1) Pull out the Shroud, F after removing the Gdlle,
2) Separate the connector connected with the Defrost Control
Assy and replace new one.

2) Exchanged Heater, Sheath and connected the housing.

SHEATH

In this refrigerator, Heater, Sheath is used for defrosting
heater. During heating, the temperature of heater rises
about 300-500°C. Therefore, be careful not to burn while
servicing.
1) After removing the Grille and Shroud, separate the
Heater, Sheath by disconnecting the connectors.

Melting

Figure

Heater, Sheath
Figure

-8-

ADJUSTMENT
1 COMPRESSOR

3) PTC-Applied Circuit Diagram
• According to Starting Method for the Motor

1) Role
The compressor intakes 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.

OVERLOAD PROTECTOR(O.L.P)

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 1/1000ram processing
precision components and is sealed after production in absence
of dust or humidity, deal and repair with care.

PTCq=

PTC STARTER

COMPRESSOR

HERMETIC
TERMINAL

RSIR
Figure

3) Note for Usage
(1) Be careful not to allow over-voltage and over-current.
(2) No Strike

4) Motor Restarting and PTC Cooling
(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.
(2) During normal operation of the Compressor Motor, PTC
elements generate heat continuously. Therefore,
if PTC isn't cooled for a while after the power has been
shut off, Motor can't operate again.

If applying forcible power or strike (dropping or careless
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, the result may be poor operation
and poor contact may cause.
(5) Be careful that dust, humidity, and flux welding don't
inflow in the Compressor inside in replacing the
Compressor. Dust, humidity, and flux due to welding
which inflows to Cylinder may cause Iockage and noise.

5) Relation

of PTC-Starter and OLP

(1) If the power is off during operation of Compressor and
the power is on before the PTC is cooled, (instant shutoff within 2 min. or reconnect a power plug due to
misconnecting), the PTC isn't cooled and a resistance
value grows. As a result, current can't flow to the subcoil and the Motor can't operate and the OLP operates
by flowing over current in only in the 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 circuitshort and fire. Therefore, use a properly fixed OLP
without fail.

2 PTC-STARTER
1) Composition of PTC-Starter
(1) PTC (Positive Temperature Coefficient) is a no-contact
semiconductor starting device which uses ceramic
material and this material consists of BaTiO3.
(2) The higher the temperature is, the higher becomes the
resistance value. These features are used as starting
device for the Motor.

6) Note to Use PTC-Starter
(1) Be careful not to allow over-voltage and over-current.
(2) No Strike

2) Role of PTC-Starter
(1) PTC is attached to Hermetic Compressor used for
Refrigerator, Show Case and starts Motor.
(2) Compressor for household refrigerator applies to
single-phase induction Motor.
For normal operation of the single-phase induction
motor, in the starting operation flows in both main coil
and sub-coil. After the starting is over, the current in
subcoil is cut off. The proper features of PTC play all
the above roles. So, PTC is used as a motor starting
device.

Don't apply a forcible power or strike.
(3) Keep apart from any liquid.
If liquid such as oil or water away enter the PTC,
PTC materials it may break due to insulation
breakdown of the material itself.
(4) Don't change PTC at your convenience.
Don't disassemble PTC and mold. If the exterior to the
PTC-starter is damaged, resistance value is altered and
it may cause poor starting of the compressor motor
may cause.
(5) Use a properly fixed PTC.

-9-

30LP

(OVER

LOAD

PROTECTOR)

CONTACTINGD
POINT

1) Definition of OLP
(1) OLP (OVER LOAD PROTECTOR) is attached to the
Hermetic Compressor and protects the Motor by cutting
off current in Compressor Motor in case of over-rising
temperature by Bimetal in the OLP.
(2) When over-voltage flows to Compressor motor, the
Bimetal works by heating the heater inside the OLP,
and the OLP protects Motor by cutting off current which
flows to the Compressor Motor.

COVER

BIMETAL

2) Role of the OLP
(1) The OLP is attached to the Hermetic Compressor used
for the Refrigerator and Show Case and prevents the
Motor Coil from being started in the Compressor.
(2) De not turn the Adjust Screw of the OLP in any way for
normal operation of the OLP.
(Composition and connection Diagram of OLP)

BIMETAL
ADJUSTB
SCREW

HEATER

CIRCUIT DIAGRAM
CIRCUIT DIAGRAM

3854JD1026A
BK:BLACK

BN:BROWN

RD;RED

BO BRIGHTORANGE

YL:YELLOW

GN:GREEN

BL:BLUE

PR;PURPLE

SB:SKY BLUE PK:PINK

GN/YL:GREENHELLOW

GY:GRAY

NOTE : 1. This is a basic diagram and specifications vary in different localities.

-10-

WH:WHITE

WH/BK;WHITEtBLACK

Figure 20

TROUBLESHOOTING
1 COMPRESSOR

AND ELECTRIC

Source.
Power

(Mechanical

Part)

COMPONENTS

Remove the PTCStarter from the

(Rating Voltage
_+10%)?

YES

Compressor and
measure the voltage
between Terminal C of
Compressor and
Terminals 5 or 6 of PTC.

OLP disconnected?

YES

Replace OLR

condition.

Advise the customer
to use a regular
Trans.

in the range of Rating
}Dj Voltage
Applied _+10%.
voltage isn't

Check the
resistance of
Motor
Compressor.

Check the
resistance of
PTC-Starter.

Check
connection
Reconnect.

YES

among M-C, S-C and
M-S in Motor
heck the resistance
Compressor.

Replace Compressor.

YES

two terminals in PTCheck the resistance of
Starter.

_- I PTC-Starter.
Replace

YES
Check OLR
_

a heck
regularif applying
OLP.

30 sec. in forcible
OLP operation by
turning instant power
OLP
works
on and
off. within

Check
starting state.
_,_

starting voltage after 5
min. for balancing cycle
pressure
cooling the _
easure and
minimum
PTC.

Replace OLP.
YES

O_K_

the voltage of Rating
Voltage -+10% below.
ComponentsI start in

-11 -

2 PTC AND OLP

Normal operation of
Compressor is
mposs b e or poor.

Observation value is
220V/50Hz : 22§ _+30%
115V/60Hz : 6.8§ _+30%
240V/50Hz : 33§ _+30%
127, 220V/60Hz : 22§
+_3O%

Separate the PTC-Starter
from Compressor and
measure the resistance
between No. 5 and 6 (only
RSIR type) or No. 4 and 5 of
PTC-Stader with a Tester or
Whistone Bridge.
(Figure 21)

. 'oros,'a
t cv
or serveral hundreds §.

Separate the OLP from the
Compressor and check the
resistance value between
two terminals of OLP with
a Tester. (Figure 22)

electric
t Check
another
components.

Check another

electric components.

Figure 21

Replace

OLP.

Figure 22

-12-

Replace
PTC-Starter.

3 ANOTHER

ELECTRIC

COMPONENTS

• Cooling is impossible
Compressor
doesn't run.

_._
_

Check if current flows to
the following
components.

Cause.

a. Thermistor

_- Poor contacting.
Shorted or broken.

b. Starting devices

_, Poor contacting
or shorted.

c. OLP
d. Compressor

Coil shorted.

coil

e. Circuit Parts

]

Running state of
Compressor is poor.

Check a starting
voltage.
Check if current flows
to starting devices.

t
•

Replace
each component.

Poor contacting
or shorted.

"-LLow voltage.

]

,.j

Raise the voltage.

Replace
_,[ each component.

and
Poorbroken.
contacting

Check current flowing
in sub-coil of
Compressor.

Shorted.

Check capacity of OLR ]_{

Lack of capacity.

above
are described
normal.
The items

Coil of motor
Compressor.

]_[

Replace
the compressor.

Cooling ability is poor

Fan motor
doesn't run.

[__

Check current flowing
in SWITCH, DOOR.

Poor contacting.
"[

Check current flowing inthe
MOTOR[MECH], FAN.
_

Much frost are sticked
to the EVAPORATOR.

Check current flowing
of the following
components.
• THERMISTOR
• FUSE, MELTING

Replace
each component.
Coil is shorted.

Shorted.

Check current flowing
of the following
components.
• HEATER, SHEATH

Replace
each component.

Replace
the Heater, Sheath

-13-

4 SERVICE

DIAGNOSIS

CHART

COMPLAINT

POINTS TO BE CHECKED
Is the power cord unplugged from the outlet?
Check if the power switch is set to OFF.
Check if the fuse of power switch is shorted.
Measure the voltage of power outlet.

REMEDY

Cooling is
impossible.

,
,
•
•

Cooling ability
is poor.

• Check if the set is placed close to wall.
• Check if the set is placed close to stove, gas
cooker and direct rays.
• is the ambient temperature high or
the room door closed?

• Place the set with the space of about 10cm.
• Place the set apart from these heat
appliances.
• Make the ambient temperature below.

• Check if put in is hot.
• Did you open the door of the set too often
or check if the door is closed up?
• Check if the Damper Control is set to "cold-position".

• Put in foods after cooled down.

Foods in the
Refrigerator
are frozen.

, is foods placed in cooling air outlet?
, Check if the control is set to "cold-position".
• is the ambient temperature below 5°C?

• Place foods in high temperature section.
(Front Part)
• Set the control to "mid-position".
• Set the control to "warm-position".

Dew or ice
forms in the
chamber of
the set.

• is liquid food stored?
, Check if put in is hot.
• Did you open the door of the set too
often or check if the door is closed up.

• Seal up liquid foods with wrap.
• Put in foods after cooled down.
• Don't open the door too often and close
it firmly.

Dew forms
in the Exterior Case.

, Check if ambient temperature and humidity
of surroumcling air are high.
• is there gap in the door packed?

• Wipe dew with a dry cloth. This occurrence
is solved naturally in Iow temperature and humidity.
• Fill up the gap.

Abnormal
noise generates,

, Are the set positioned in a firm and even place?

• Adjust the Adjust Screw, and position
in the firm place.
• Remove the objects.

• Are any unnecessary objects set
in the back side of the set?

To ciose the door
is not handy,

Plug to the outlet.
Set the switch to ON.
Replace a regular fuse.
If voltage is low, wire newly.

• Don't open the door too often and close
it firmly.
• Set the control to mid-position.

• Check if the Tray Drip is not firmly fixed.
• Check if the cover of mechanical room
in below and front side is taken out.

• Fix it firmly on the original position.
• Place the cover at the original position.

• Check if the door packing is dirty
with filth such as juice.
• is the set positioned in a firm and even place?

• CIean the door packing.

• is too much food putted in the set?
ice and foods
smeli unpleasant.

•
•
•
•

, Check if the inside of the set is dirty.
, Did you keep smeIly foods without wrapping?
• it smells of plastic.

• Position in the firm place and adjust the
Adjust Screw.
• Keep foods not to reach the doo£
• Clean the inside of the set.
• Wrap smelly foods.
• The new products smells of plastic, but it is
eliminated after 1-2 weeks.

• In addition to the items described left, refer to the followings to solve the complaint.
Check if dew forms in
the Freezer.

Defrosting
is poor.

Replace the
Components of
defrosting circuit.

Check Refrigerating
Cycle.

The cycle
is faulty.

Repair the cycle.

Check the
Damper Control

The operation of
the Damper
Control is poor.

Replace the
Damper Control

-14-

5 REFRIGERATING
• Troubleshooting

CYCLE
Chart

CAUSE

STATE OF
THE SET

TEMPERATURE
OF THE
COMPRESSOR

REMARKS

PARTIAL
LEAKAGE

Freezer room and
Refrigerator
don't cool
normally,

Low flowing sound of
Refrigerant is heard and
frost forms in inlet only

A little high
more than
ambient
temperature,

• A little Refrigerant
discharges.
• Normal cooling is possible
when injecting of Refrigerant
the regular amount.

WHOLE
LEAKAGE

Freezer room and
Refrigerator
don't cool
normally,

Flowing sound of Refrigerant
is not heard and frost isn't
formed,

Equal to ambient
temperature.

• No discharging of Refrigerant.
• Normal cooling is possible
when injecting ef Refrigerant
the regular amount.

PARTIAL
CLOG

Freeze room and
Refrigerator
don't cool
normally,

Flowing sound of Refrigerant
is heard and frost forms
in inlet only.

A little high
more than
ambient
temperature.

• Normal discharging of
refrigerant,
• The capillary tube is faulty.

WHOLE
CLOG

Freezer room and
Refrigerator
don't cool.

Flowing sound of Refrigerant
is not heard and frost isn't
formed.

Equal to ambient
temperature.

• Normal discharging of
Refrigerant.

MOISTURE
CLOG

Cooling operation
stops periodically,

Flowing sound of Refrigerant
is not heard and frost melts,

Low than
ambient
temperature

• Cooling operation restarts
when heating the inlet of
capillary tube.

Freezer and
Refrigerator
don't cool.

Low flowing sound of
Refrigerant is heard and
frost forms in inlet only.

A little high
than ambient
temperature,

• The pressure of high
pressure part in
compressor is low.

No compressing
operation,

Flowing sound of Refrigerant
is not heard and no frost,

Equal to ambient
temperature,

• No pressure of high pressure
part in the compressor.

mr>
>

STATE OF THE
EVAPORATOR

m
u
£U

-<
03

o
O_
:um
rnQ

COMPRESSION

03-4

_ _ NO COMPO rn RESSION
Z

•

Leakage Detection

• Observe discharging

Whether Compressor
runs or not,

point of refrigerant which may be in the oil discharging part in the compressor and hole of evaporator.

Whether frost
forms or not in
Evaporator.

YES

No frost
or forms
in inlet only

leaks
or not.
Whether
oil

Frost formed normally
Observe the discharged
amount of Refrigerant.

Normal amount

No or much amount
Moisture Clog.

Faulty
Compressor.

YES

Inject Refrigerant to Compressor
and check coo ng operat on.
7 ¸

Check Compressor

Clogged by dust.

_'1 Gas leakage.
Frost formed normally

-15-

(Check the leakage point)

• General Control of Refrigerating Cycle
NO.

ITEMS
WELDINg
ROD

CONTENTS

AND SPECIFICATIONS

(1) H 30
• Chemical Ingredients
Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20%
• Brazing Temperature: 710~840°C
(2) Bcup-2
• Chemical Ingredients
Cu: About 93%
P: 6.8~7.5%
The rest: within 0.2%

REMARKS

• Recommend H34 containing 34% Ag in the
Service Center.

• Brazing Temperature: 735~840°C
FLUX

• Ingredients and how to make
Borax 30%
Borax 35%
Fluoridation kalium: 35%
Water: 4%

• Make amount for only day,
Holding period: 1 day
• Close the cover of container to prevent dust
putting in the FLUX.
• Keep it in a stainless steel container.

Mix the above ingredients and boil until
they are transformed into liquid.
DRIER
ASM

(1) Assemble the drier within 30min.
after unpacking.
(2) Keep the unpacked drier at the temperature
of 80~100°C.

• Don't keep the drier in a outdoors because
humidity damages to it.

VACUUM

(1) When measuring with pirant Vacuum
gauge the charging M/C, vacuum
degree is within 1 Torr.
(2) If the vacuum degree of the cycle inside is
10 Torr. below for low pressure and 20 Torr.
for high pressure, it says no vacuum
leakage state.
(3) Vacuum degree of vacuum pump must be
0.05 Torr. below after 5 min.

• Apply M/C Vacuum Gauge without fail.
• Perform vacuum operation until a proper
vacuum degree is built up.
• If a proper vacuum degree isn't built up,
check the leakage from
the Cycle Pipe line part and
Quick Coupler Connecting part.

(4) Vacuum degree must be same to the
value described item (2) above for more than
20 min.
DRY AND
AIR
NITROGEN
GAS

(1) The pressure of dry air must be more
han 12~16kg/cm 2
(2) Temperature must be more than
-20- -70°C.
(3) Keep the pressure at 12~6kg/cm2 also
when substituting dry air for Nitrogen Gas.

NIPPLE
AND
COUPLER
PiPE

(1) Check if gas leaks with soapy water.
(2) Replace Quick Coupler in case of leakage.

• Put all Joint Pipes in a clean box and
cover tightly with the lid so that dust or
humidity is not inserted.

-16-

• Check if gas leaks from joint of the
Coupler.

MICOM FUNCTION & PCB CIRCUIT EXPLANATION
This description

1 FUNCTION

is made for GR-349, 389SQ. Please refer to overall PCB circuits for other models.

EXPOSITION

1) FUNCTION
(1) The refrigerator starts from optimum condition when electric power is first on, But the operation condition changes "Mid"
"Mid/Max"
_"Max" _ "Min" _ "Min/Mid" _ "Mid" whenever pressing the FREEZE TEMP button.
(2) It returns to "Mid" conditions if power off and on again.

VACATION

FREEZE TEMP

QUICK FREEZE

(_)NOTC_

]-EMP(°C)-li5
ROOM

2) QUICK

-_ii!5

-1:-_i!5

-22

FREEZER

(1) Function to raise the freezing speed by operating the COMP successively. As pressing the QUICK FREEZE button, the
QUICK FREEZE LED is displayed. Then after 3 hours' successive operation of COMP, the QUICK FREEZING function
will be released.
(2) Defrosting During the QUICK FREEZING operates as follow.
When the QUICK FREEZING time is below 90 minutes, defrost and then operate the QUICK FREEZING for the
remaining time. When the QUICK FREEZING time is over 90 minutes, defrost and then operate the QUICK FREEZING
for 2 hours
(3) If QUICK FREEZE button is pressed during defrosting, the QUICK FREEZE LED is lit up. But the QUICK FREEZING
operates for 3 hours after 7 minutes from the end of defrosting.
(4) If VACATION button is pressed during the QUICK FREEZING, the QUICK FREEZING LED function is released.
(5) If power off during the QUICK FREEZING and power on again, the QUICK FREEZING function is released.

3) VACATION

FUNCTION

(1) Function for Energy Saving. As pressing the VACATION button, the VACATION LED is displayed and this function is
operated.
(2) Freezer Compartment

is not kept by compressor at the notch displayed but at -13°C+ differential.

(3) Defrosting and Fan control is same as normal operation.
(4) If QUICK FREEZE button is pressed during the VACATION FUNCTION, VACATION FUNCTION is released.
(5) If power off during the VACATION FUNCTION and power on again, the VACATION FUNCTION is released.

-17-

4) DOOR OPENING ALARM
(1) When the REFRIGERATOR
to notify it.

DOOR is opened and won't be closed after 1 minute from the its opened, BUZZER sounds

(2) At frist, BUZZER sounds three times at each intervals of 0.5 second. Then makes a 0.5 second ONIOFF alarm three
times at intervals of 30 seconds.
(3) If the REFRIGERATOR

FREEZER
DOOR

door closed during ALARM, it is released.
i

OPEN

CLOSE_

i
ICLOSE

i three
i times

three
times

i three
i times

BUZZER

within

1 minute

5) DISPLAY

BUTTON

30
seconds

RING

(1) If display function button(FREEZE TEMP, QUICK FREEZE, VACATION) of the front of the TOP COVER is pushed,
BUZZER rings with "DING- DONG-"(See the BUZZER OPERATION CHECK)
6) DEFROSTING
(1) If the accumulated time for the operation of the COMPRESSOR
started.
(2) The first defrosting is performed at 4 hours(compressor

is meet with 7 hours, the DEFROSTING

HEATER is

ON) later since the power is on,

(3) If DEFROST SENSOR is over 7°C during DEFROSTING, end the operation of DEFROSTING with DEFROSTING
HEATER paused, And after 7 minutes, the operation for the freezing is started,
But, if DEFROST SENSOR is not reach to 7°C after 2 hours' operation of the defrosting heater, it represents a defrosting
trouble.(See the TROUBLE REPRESENTING FUNCTION)
(4) If DEFROST SENSOR is short or open, defrosting is not performed.

7) ORDERLY

OPERATION

OF ELECTRIC

PARTS

To avoid NOISE and DAMAGE, the items containing an electric parts such as COMP, DEFROSTING
MOTOR operate in order as follows.
OPERATION

OPERATION ORDER

STATE

WHEN DEFROST SENSOR
TEMPERATURE IS OVER
7°C, (WHEN PURCHASING
OR MOVING)

HEATER and FAN

POWER
ON

COMP
ON

after 0.5 sec.

FAN
ON

_
after 0.5 sec.

WHEN DEFROST SENSOR
TEMPERATURE IS BELOW
7°C. (WHEN POWER
FAILURE OR SERVICING)

..1

POWER
ON

_
after 0.5 sec.

_'_

DEFROSTING
HEATER ON

COMP
ON

DEFROSTING
HEATER ON

after 0.5 sec.
WHEN RETURNING TO NORMAL
STATE FROM TEST MODE

"_
after 10 sec.

FAN
ON

after 0.5 sec.

All Elec. Parts
OFF
after 7 min.
-18-

_'_

COMP
ON

="
after 0.5 sec.

FAN
ON

8) SELF-TEST
(1) Function to make service easy in case of occuring a trouble in the product.
(2) When occurring a trouble, if the button is pushed, but the function could not operate.
(3) If a toruble release during the representation

of trouble, a refrigerator performs the normal function(RESET).

(4) To represent a ERROR CODE, it use FREEZE TEMP LEDs on TOP COVER. If ERROR occurs, the other LEDs except
ERROR CODE LEDs are all off.

VACATION

FREEZE TEMP

QUICK FREEZE

[oi [oi [oi
F1

ERROR CODE LEDs

NO.

ITEMS

ERROR CODE LEDs
FI
F2 F3 F4

FREEZER
_ENSOR abnormal

(_
,

•

DEFROST
_ENSOR abnormal

•

[ OPERATE

NORMAL

DEFROSTING
FUNCTION
is abnormal

R%SENSOR
abnormal

NOTE 1)

OPERATION IN TROUBLE'S OCCURRING
COMP

FAN

DEFROST
HEATER

•

FREEZER SENSOR open 15 minutes On/
or short.
15 minutes Off

•

DEFROST SENSOR open
or short.

No defrosting

DEFROST HEATER,
TEMP. FUSE open or
disconnection (Displayed
after at least 4 hours
from the trouble's
occurring.)

Room Temperature
SENSOR open or short

* NOTE 1) If one second pass after pressing the QUICK FREEZE and FREEZE TEMP buttons togather in normal
operation, operates as follow.
RT-SENSOR

:OFF

DESCRIPTION

ION

If normal, LEDs on the TOP COVER is all on.
If abnormal, LEDs are all on except VACATION LED.

-19-

9) FUNCTION

TEST

(1) Function to check the testing function of PCB and refrigerator and to find where the trouble.
(2) The test switch is on the MAIN PCB of refrigerator.
TEST FUNCTION is released and RESET after MAX. 2hours regardless of TEST MODE.
(3) If the buttons on TOP COVER is pushed during TEST MODE, Function is not operated and only BUZZER ring with
"DING-DONG-"
(4) After the end of TEST MODE, pull out the power cord and plug it in again(RESET).
(5) If a ERROR occurs during the TEST MODE, TEST FUNCTION is released and DISPLAY LEDs represent ERROR
CODE.
(6) If the TEST swithch is pushed during ERROR CODE, TEST FUNCTION is not operated.
MODE

OPERATION

CONTENTS

REMARKS

TEST 1

Press TEST button
once.

1. COMP OPERATES SUCCESSIVELY.
2. FAN OPERATES SUCCESSIVELY.
3. DEFROSTING HEATER OFF
4. ALL DISPLAY LEDS ON.

TEST 2

Press TEST button
once in the state of
TEST MODE 1.

1. COMP OFF.
2. FAN OFF.
3. DEFROST HEATER ON.
4. ALL THE DISPLAY LEDS OFF EXCEPT
QUICK FREEZE AND VACATION LEDS.

If DEFROST HEATER
is over 7°C, it returns
to the NORMAL STATE.

NORMAL
STATE

Press TEST button
once in the state of
TEST MODE 2.

Return to the initial condition.
(RESET)

Comp starts
after 7 minutes.

• LED Check Function

: Press the QUICK FREEZE and FREEZE TEMP buttons at the same time. After 1 sec., all the
LEDs of the DISPLAY are ON simultaneously. If release the BUTTON, return to the previous
condition.

- 20 -

2 FUNCTION

DESCRIPTION

1) ELECTRIC CIRCUITS

TEST

Vss(Vass)

TRANS secondary side is composed of electric power circuits for RELAY driving electricity (12Vdc) and for supplying
electricity to MICOM and IC (5Vdc). The voltage in each part is as follows.
PARTS

both ends of VA1

both ends of CM1

both ends of CM2

both ends of CE2

both ends of CC2

VOLTAGE

230Vac

14Vac

17Vdc

12Vdc

5Vdc

VA1 is the part to protect over voltage and noise, When more than 385V is applied, the thermaFfuse(130°C
option) in a first part of TRANS is cut so that the elements in the secondary side of TRANS are protected.

cut-off, local

2) OSCILLATION CIRCUIT

osc1
CST4 00MGW

r[-,

CIRCUIT for occurring CLOCK which motivates the internal local element of IC1 to transmit and receive an information and
BASIC TIME for calculating time. Use a proper form for OSC 1, Because in case that SPECIFICATION is changed, the
calculated time in IC1 is changed or IC1 isn't able to operate.

3) RESET CIRCUIT

_ESET

All the internal parts of MICOM(IC1) return to the initial condition when the early power ON or apply power again in MICOM
after temporary power failure. As a result, all the functions operate acording to the early condition. At the early period of
power ON the "LOW" voltage is applied in the RESET terminal of MICOM for the fixed time. The RESET terminal is 5V
during the general operation.
-21

4) LOAD/BUZZER

OPERATION, DOOR OPENING SENSING CIRCUIT

(1) LOAD OPERATION CHECK
CON1

i{ )
RY1

_ ]

IC4

D6
IN4_4

OLP

CONP

COOLING

]

FAN

FAN MOTOR

D8
FUSE

DEFROSTING

HEATER

COMP,

KIND OF LOAD

FAN MOTOR

DEFROSTING HEATER

No.14

No.15

COMP COOLING FAN
MEASURING POINT (IC5)

No.13

below 1V

OFF

12V

STATE

/df the DOOR-R is opened during FAN MOTOR is operated, FAN MOTOR is stopped immediately.
foThe (_, (_ of DOOR SlW-R is connected DOOR OPEN DETECTION CIRCUIT as follow.
fdf the DOOR-R is opened or closed, then the DOOR SIW-R is ONIOFF, and the LAMP-R is ON/OFF,
and at the same time, SAN of the @, (_ of DOOR StW-R for detection of DOOR-R open is ONIOFR
(2) DOOR OPENING

PERCEPTION CHECK
CON3

*NOTICE: If you would change DOOR S/W-R, must use the componenot of right PART NUMBER, Because there is a
similar type DOOR StW-R of NOT MICOM MODEL, it's logic of the (_, (_ of DOOR StW-R is reversed.
_MEASURING

POINT

NO.6 OF IC 1 (MICOM)

REFRIGERATOR
D_

5V(S/W of (_), (_) is OFF state)

OPEN

0V(StW of (_), (_ is ON state)

fLEven though LAMP-R is operated a normal ON/OFF according to DOOR S/W-R, but the MICOM couldn't detect a
DOOR-R opened or closed of lead wire of the _}, (_ is abnormal or SAN of the (_, (_ of DOOR StW-R is abnormal.
fcVVhen DOOR-R open isn't detected : Even though DOOR-R is opened, FAN MOTOR couldn't stop.
When DOOR-R close isn't detected : Even though DOOR-R is closed, BUZZER sounds a DOOR OPEN ALARM.
check a lead wire of the (_, _) and DOOR S/VWR.

- 22 -

(3)BUZZER

OPERATION CHECK

14
R55/BUZ

R40/INT0

CONDITIONS
MEASURI_
POINT

DISPLAY FUNCTION BUTTON RING
(DING~ DONG~)

!O.05si_
,

ICl (No.14 Pin)

5v
OV--

0.2s

_!O.lsi_
,

0.5s

: 0.5s

i
OV--

-l

ICl (No.13 Pin)

0V--

J
!_

I
2.66khz(DING)

/
2.232khz/DONG_/ !

- 23 -

°v=--tl Y
0V _

--,

i 3.1kh_ i

OFF

DOOR OPEN ALARM
(SCREECHING)

ov
OV

5) TEMP SENSOR CIRCUITS

CON3

CON101

RT SENSOR
(RT-SENSOR)

\\\

T
R67

R19
CClO_

(AN7)

223/?[

RF3

261KF

_,_

26.1KF

2K
7

@
\\\

R65

R16

cc8_

(AN5)

RF2

CON4

"_'

4 _

D SENSOR

]

(DEFROST

SENSOR)

_RFI
R64

cc71

(AN4)

R15

_162KF

F SENSOR

(FREEZER

223 f?[7

COMPARTMENT

SENSOR)

The above circuit reads the surrounding temperature, DEFROSTING temperature and FREEZER ROOM temperature
MICOM(ICl). OPEN or SHORT state of each SENSOR is as follows.

SENSOR

CHECK POINT

ROOM TEMPERATURE
SENSOR

POINT(_Voltage

DEFROST SENSOR

POINT(_)Voltage

FREEZER SENSOR

POINT @Voltage

'4ORMAL (_30°C-50°C)

SHORT

OPEN

0.5V - 4.5V

6) SWITCH INPUT CIRCUIT
The following circuit is a test switch input circuit for checking the refrigerator.

ICl

R56 _s

TEST
Go

- 24 -

S/W

into

7) TEMPERATURE

COMPENSATION

FREEZER TEMPERATURE
COMPENSATION

IC1

FREEZER ROOM
RESISTANCE VALUES(R1)

TEMPERATURE

COMPENSATION

180 k_

+ 5.0°C

56 k_

+4.0°C

33 k_

+3.0°C

18 k_

+2.0°C

12 k_

+1.0°C

10 k_

O°C

8.2 k_

-1.O°C

5.6 k_)

-2.0°C

3.3 k_)

_3.0°C

2 k£_

4.0°C

470 £_

_5.0oc

REMARKS
COMPENSATE

WARMLY

• TEMPERATURE
temp,)

COMPENSATION

STANDARD

COMPENSATE COOLLY

TABLE by adjusting resistance values. (the temp difference compared to the present

eg) If the compensation resistance of freezer compartment is changed from 10K (present resistance) to 18K (revised
resistance), the temp of freezer compartment goes up by +2°C.

- 25 -

• TEMPERATURE

COMPENSATION

OF FREEZER ROOM

Rev]sedreslstance
_'--_

470_

470£_

NOT
1oct
COMPENSATE
1°c,J.

2k£_

3.3k0

5.6k0

2k£_

3.3k£_

5.6k£_

8.2k£_

10k£_

12k£_

18k£_

33k£_

56k£_

180k£_

2oct

3ocl.

4oct

5o01.

6ocl.

7ocl.

8ocl.

9oct

10oc 1,

2°C1"

3°Ct

4°C1"

5°C1"

6°C1"

7°C1"

8°Ct

9°C1"

2°CT

3°C1"

4°01 `

5°01`

6°C1`

7°C1`

8°C1`

2°C1`

3°C1`

4°C1`

5°C1`

6°C1`

7°C1`

NOT
1°C1`
COMPENSATE

2°C1`

3°C1`

4°C1`

5°C1`

6°C1`

NOT
1°C1`
;0MRENSATE

2°C1`

3°C1`

4°C1`

5°C1`

NOT
1oc1,
_OMFE_SA1E

2oc1,

3ocl,

4oc1,

2°C1`

3°C1`

NOT
1°C1`
_OMFE_SA]E

2°C1`

NOT
1°Ct
COMPENSATE

2°c,J.

1°c,J.

NOT
1°C1"
;OMPENSATE

3°c,J.

2°c,J.

1°c,J.

4°c,J.

3°c,J.

2°c,J.

1°C4-

5°c,J.

4°c,J.

3°c,J.

2°C$

1°c,J.

6oc,j.

5oc,j.

4oc,j.

3oc$

2oc,j.

1oc4"

7°c,J.

6°c,J.

5°c,J.

4°C$

3°c,J-

2°C$

1°C4-

8°c,J.

7°c,J.

6°c,J.

5°C$

4°c,J.

3°C$

2°C$

1°C$

9°c,J.

8°c,J.

7°c,J.

6°C$

5°c,J.

4°C$

3°C$

2°C$

1°C$

lOC,J.

9°c,J.

8°c,J.

7°C$

6°c,J.

5°C$

4°C$

3°C$

2°C$

NOT
1°C1`
COMFENSATE

8.2k0
FREEZER
ROOM
(R1)

10k£_

12k£_

18k£_

NOT
1°C1`
COM_NSATE

33kD

56k£_

180kD

• This circuit is aimed to input the necessary temperature compensation
temperature which is different in each model.

- 26 -

NOT
1°C1`
COMPENSATE
l°C,J.

NOT
COM_NSAT£

values into the MICOM in order to adjust the freezer

8) LIGHTING CIRCUITS OF KEY BUTTON INPUT AND DISPLAY PARTS

CON5

CON101
SCAN2

KR%O6M
28

SCAN1

SCANO

27
R04

KRAIO6M

Ew_
Q3
KRAIO6M

R05
180

R06

DSPO

R12

L5_

}SP1
VAC

R07

}SP2

180

R4_

5
_CC6

/o
VACATION
KEY

IR14

FREEZER
CONTROL

SV,lg2
TEMP
KEY

ya sva0,_
QUICK
FREEZE
KEY

_7 lo2

DISPLAY PART

The above circuit is to judge the operation conditions of function
by SCAN method.

- 27 -

key and to light each function indicating LED. It is operated

3. SENSOR

RESISTANCE

CHARACTERISTICS

TABLE

MEASUREDTEMPERATURE RESISTANCEOFFREF..ZERSENSOR
RESISTANCEOFDEFROSTSENSOR,
ROOMTEMPERATURESENSOR
_20°C

22.3k_

77k_

-15°C

16.9kD

60kD

-10°C

13.0kD

47.3kD

-5°C

10.1kD

38.4kD

0°C

7.8kD

30kD

+5°C

6.2kD

24.1kD

+10°C

4.9kD

19.5kD

+15°C

3.9kD

15.9kD

+20°C

3.1kD

13kD

+25°C

2.5kD

11kD

+30°C

2.0kD

8.9kD

+40°C

1.4kD

6.2kD

+50°C

0.8kD

4.3kD

• The tolerance of sensor resistance is +5%.
• Be sure to measure the sensor resistance after keeping the sensor more than 3 minutes at a measuring temperature.
(It needs delay due to sensor speed.)
• Measure the resistances of SENSORs with a digital tester after disconnecting

- 28 -

CON 4 of MAIN PWB ASSY.

4. MAIN PWB ASS'Y

AND PARTS

LIST

1) MAIN PWB ASS'Y
f

[34

- 29 -

2) REPLACEMENT
NO

D_V3 NO

DESORIPTIO_

PARTS LIST
SPEC'

QTY

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Source Exif Data:
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File Type Extension : pdf
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Page Count : 33
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Create Date : Tue Apr 03 02:45:06 2007
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Title :
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LG LRBP1031NI User Manual REFRIGERATOR Manuals And Guides L0301004

LG Bottom Mount Refrigerator Manual L0301004 LG Bottom Mount Refrigerator Owner's Manual, LG Bottom Mount Refrigerator installation guides

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