LG GR-B207WVQ.CSWQAGE Service Manual

CAUTION

PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS BOOK BEFORE CHECKING OR OPERATING THE REFRIGERA

TOR .

REFRIGERATOR

SERVICE MANUAL

http://biz.lgservice.com

MODEL:GR-B207WVQ.CSWQAGE

Color:Super White

WARNINGS AND PRECAUTIONS FOR SAFETY ........................................................................................... ..................... 3

SPECIFICATIONS................................................................................................................................................................... 4

PARTS IDENTIFIC ATION ........................................................................................................................................................5

HOW TO INSTALL THE REFRIGER ATOR .......................................................................................................................... 6

HOW TO ADJUST DOOR HEIGHT OF THE REFRIGERATOR ........................................................................................ 6

HOW TO INSTALL WATER PIPE........................................................................................................................................ 6

HOW TO CONTROL THE AMOUNT OF WATER SUPPLIED TO THE ICEMAKER ......................................................... 7

MICOM FUNCTION .............................................................................................................................................................. 8-12

EXPLATION FOR MICOM CIRCUIT..................................................................................................................................... 13

EXPLANATION FOR PWB CIRCUIT ................................................................................................................................. 13

COMPENSATION CIRCUIT FOR WEAK-COLD, OVER-COLD AT FREEZING ROOM.................................................... 14

PWB PARTS DRAWING AND LIST ................................................................................................................................... 35

PWB CIRCUIT DIAGRAM .................................................................................................................................................. 25

CIRCUIT................................................................................................................................................................................ 26

TROUBLE DIAGNOSI S ........................................................................................................................................................ 27

TROUBLE SHOOTING ...................................................................................................................................................... 37

FAULTS ............................................................................................................................................................................ 45

COOLING CYCLE HEAVY REPAIR ................................................................................................................................. 57

HOW TO DEAL WITH CLAIMS........................................................................................................................................ 65

HOW TO DISASSEMBLE AND ASSEMBL E ..................................................................................................................... 66

DOOR............................................................................................................................................................................... 66

HANDLE ........................................................................................................................................................................... 67

SHROUD, GRILLE FAN ................................................................................................................................................... 67

EXPLODED VIEW .............................................................................................................................................................. 68-72

CONTENTS

- 2 -

Please observe the following safety precautions in order to use safely and correctly the refrigerator and to prevent accident and danger during repair.

1. Be care of an electric shock. Disconnect power cord from wall outlet and wait for more than three minutes before replacing PWB parts. Shut off the power whenever replacing and repairing electric components.

2. When connecting power cord, please wait for more than five minutes after power cord was disconnected from the wall outlet.

3. Please check if the power plug is pressed down by the refrigerator against the wall. If the power plug was damaged, it may cause fire or electric shock.

4. If the wall outlet is over loaded, it may cause fire. Please use its own individual electrical outlet for the refrigerator.

5. Please make sure the outlet is properly earthed, particularly in wet or damp area.

6. Use standard electrical components when replacing them.

7. Make sure the hook is correctly engaged. Remove dust and foreign materials from the housing and connecting parts.

8. Do not fray, damage, machine, heavily bend, pull out, or twist the power cord.

9. Please check the evidence of moisture intrusion in the electrical components. Replace the parts or mask it with insulation tapes if moisture intrusion was confirmed.

10. Do not touch the icemaker with hands or tools to confirm the operation of geared motor.

11. Do not let the customers repair, disassemble, and

reconstruct the refrigerator for themselves. It may cause accident, electric shock, or fire.

12. Do not store flammable materials such as ether, benzene, alcohol, chemicals, gas, or medicine in the refrigerator.

13. Do not put flower vase, cup, cosmetics, chemicals, etc., or container with full of water on the top of the refrigerator.

14. Do not put glass bottles with full of water into the freezer. The contents shall freeze and break the glass bottles.

15. When you scrap the refrigerator, please disconnect the door gasket first and scrap it where children are not accessible.

WARNINGS AND PRECAUTIONS FOR SAFETY

- 3 -

SPECIFICATIONS

- 4 -

ITEMS SPECIFICATIONS

DIMENSIONS (mm) 894(W)X725(D)X1753(H)

NET WEIGHT (kg) 110

COOLING SYSTE

M Fan Cooling

TEMPER

ATURE CONTROL Micom Control

DEFROSTING SYSTE

M Full Automatic

Heater Defrost

INSUL

ATION Cyclo-Pentane

COMPRESSO

R P.T.C. Starting Type

EVAPORATOR Fin Tube Type

CONDENSE

R Wire Condenser

REFRIGERAN

T R134a (180g)

LUBRIC

ATING OIL FREOL @10G (310 cc)

DRIE

R ID 0.83

ITEMS SPECIFICATIONS

CAPILLARY TUBE MOLECULAR SIEVE XH-7

FIRST DEFROS

T 4 - 5 Hours

DEFROST CYCL

E 13 - 15 Hours

DEFROSTING DEVIC

E Heater, Sheath

ANTI-FREEZING HE

ATER Damper Heater

FREEZER LAM

P 40W (1 EA)

REFRIGER

ATOR LAMP 40W (1 EA)

3. Model spec.

5 7

3571

PARTS IDENTIFICATION

- 5-

Frame Display

Cover PWB

2. Ref No.

Conversion switch (Meats/Vegetables)

1. How to Adjust Door Height of Refrigerator

Make the refrigerator level first. (If the refrigerator is not installed on the flat floor, the height of freezer and refrigerator door may not be the same.

1. If the height of freezer door is lower than that of refrigerator compartment :

2. If the height of freezer door is higher than that of

refrigerator compartment :

Insert a driver into the groove of adjusting screw and rotate driver in arrow direction (clockwise) until the refrigerator becomes horizontal.

HOW TO INSTALL REFRIGER ATOR

- 6 -

Adjusting

Driver

Even if the height can not be aligned by using the height adjustment screw,insert the transparent sheet supplied with the product.

Botto m bracket

Transparent sheet

Botto m hinge

Separate the door with the lower height, use the (+) type screwdriver to unscrew the screw at the botton hinge as shown at figure , insert the transparent sheet between the bottom hinge and the bottom bracket,and then fix it with the screw as shown at figure .

Insert more transparent sheets enough to align the height.(4 sheets are supplied in total.)

Install Water Filter (Applicable to some models only)

Before Installing water filter

1. Before installing the filter, take out the top shelf of the refrigerator after tilting it to the direction ( ) and lifting it to the direction ( ) and move it to the lower part.

2. Lamp in refrigerator compartment

Installing water filter

1. Initial installation of water filter Remove the filter substitute cap by turning it counterclockwise ( ) by 90 degrees and pulling it down.

Note : Keep it safe to use it later when you do not use the

filter.

Remove the red cap from the filter and attach the sticker. Insert the upper part of the filter ( ) after aligning with the guideline marked on the control box, and fasten it by turning it clockwise by 90 degrees.

Note : Check that the guideline and the fastening

indication line are aligned.

2. Replacement of water filter While holding the lower part of the filter, turn it counterclockwise ( ) by 90 degrees and pull it down.

Note : Check that the guideline and the loosening

indication line are aligned.

After installing water filter

Reassemble the lamp cover and the top shelf of the refrigerator. To place the top shelf of the refrigerator, raise the front part of the shelf a bit so that the hook of the shelf is fit into the groove. In order to clean the water filter system, drain water for about 3 min.

Note : Then open the door of the refrigerator and check for

water droppings on the shelf under the filte

Control box

Aligning with the guide line and the fastening indication line

Aligning with the guide line and the loosening indication line

Control box

Separation of red cap

Adhesion sticker

Substitute cap

HOW TO INSTALL REFRIGER ATOR

- 7 -

Insert the tool into the marked area ( ) and push the tool to disconnect. Use the tool with the flat tip such as ( - ) screw driver. Turn the bulb counterclockwise. Max. 40 W bulb for refrigerator is used and can be purchased at a service center.

1. Monitor Panel

MICOM FUNCTION

- 8-

2. Description of Function

2-1. Funnction of Temperature Selection

* The temperature can vary ±3 °C depending on the load condition. *( ) : 127V/60Hz, 110~115V/60Hz, 115V/60Hz Rating ONLY.

*< > : TAIBEI

1. When power is initially applied or reapplied after power cut, “Medium” is automatically selected.

2. When the temperature selection switch in the freezer and refrigerator compartments is pressed, the light is on in the following sequence: "Middle"

"Middle Strong" "Strong" "Weak" "Middle Weak"

3. The temperature setting condition of freezer and refrigerator compartments shall not be indicate in the standard model when refrigerator or home bar door is closed.

Divisio n Power Initial ly O n 1st Pres s 2nd Pres s 3th Pres s 4th Press

19°C 3 °C

22°C 2 °C

23 °C 0 °C

15 °C 6 °C

17 °C 4 °C

Change

Indicat

ionLamp

Temperature Cont

rol

Middle Middle Strong Strong Weak Middle Weak

-19 °C

(-18 °C)

19 °C>

3 °C

<2 °C>

1.5 °C

<1 °C>

0 °C

<0 °C>

6 °C

.5 °C>

4.5 °C

<3 °C>

-21 °C

(-21 °C)

<-21 °C>

-23 °C

22 °C)

<-22 °C>

-15 °C

<-16

.5 °C>

-17 °C

18 °C>

Freezer Contr

frigeration

Contr

1. 88 LED

Function display board

FREEZER

Temperature adjustment botton for freezer compartment

Temperature adjustment botton for refrigerator compartment

Express freezer

Lock button

EXPRESS FRZ.

FRZ

REFRIGERATOR

CHILD LOCK

3secs

2-2. Control of variable type of freezing room fan

1. To increase cooling speed and load response speed, MICOM variably controls freezing room fan motor at the high speed of RPM and standard RPM.

2. MICOM only operates in the input of initial power or special freezing operation or load response operation for the high speed of RPM and operates in the standard RPM in other general operation.

3. If opening doors of freezing / cold storage room or home bar while fan motor in the freezing room operates, the freezing room fan motor normally operates (If being operated in the high speed of RPM, it converts operation to the standard RPM). However, if opening doors of freezing room or home bar, the freezing room fan motor stops.

4. As for monitoring of BLDC fan motor error in the freezing room, MICOM immediately stops the fan motor by determining that the BLDC fan motor is locked or poor if there would be position signal for more than 65 seconds at the BLDC motor. Then it displays failure (refer to failure diagnosis function table) at the display part of refrigerator, performs re-operation in the cycle of 30 minutes. If normal operation is performed, poor status is released and refrigerator returns to the initial status (reset).

2-3. Control of M/C room fan motor

1. The M/C room fan motor performs ON/OFF control by linking with the COMP.

2. It controls at the single RPM without varying RPM.

3. Failure sensing method is same as in fan motor of freezing fan motor (refer to failure diagnosis function table for failure display).

2-4. Door opening alarm

1. Buzzer generates alarm sound if doors are not closed even when more than a minute consecutively has passed with doors of freezing / cold storage room or home bar opened.

2. Buzzer rings three times in the interval of 0.5 second after the first one-minute has passed after doors are opened and then repeats three times of On/Off alarm in the cycle of every 30 seconds.

3. If all the doors of freezing / cold storage room or home bar are closed during door open alarm, alarm is immediately released.

2-5. Ringing of button selection buzzer

1. If pressing the front display button, “Ding ~ “ sound rings.

2-6. Ringing of compulsory operation, compulsory frost removal buzzer

1. If pressing the test button in the main PCB, “Phi ~ “ sound rings.

2. In selecting compulsory operation, alarm sound is repeated and completed in the cycle of On for 0.2 second and Off for

1.8 second three times.

3. In selecting compulsory frost removal, alarm sound is repeated and completed in the cycle of On for 0.2 second , Off for

0.2 second, On for 0.2 second and Off for 1.4 second three times.

MICOM FUNCTION

- 9 -

Doors of freezing /

cold storage room

or home bar

BUZZER

Closing

Opening

Within

a minute

A minute

seconds30seconds30seconds

Opening

Closing Closing

3 Times 3 Times 3 Times 3 Times

2-7. Frost removal function

1. Frost removal is performed whenever total operation time of compressor becomes 7 ~ 7.5 hour.

2. In providing initial power (or returning power failure), frost removal starts whenever total operation time of compressor becomes 4 ~ 4.5 hour.

3. Frost removal is completed if temperature of a frost removal sensor becomes more than 5°C after starting frost removal. Poor frost removal is not displaced if it does not arrive at 5°C even if two hours have passed after starting frost removal.

4. No removal is done if frost removal sensor becomes poor (snapping or short-circuit).

2-8. Sequential operation of built-in product

Built-in products such as compressor, frost removal heater, freezing room fan, Cooling Fan and step motor damper are sequentially operated as follows for preventing noise and part damage occurred due to simultaneous operation of a lot of parts in applying initial power and completing test.

MICOM FUNCTION

- 10-

Function Load Operation Sequence Remark

ewo

plait

inIg

niylpp

anI

DOM

SET

When temperature of

a frost removal

sensor become

more than 4

5°C (In purchase, movement

)

If error occurs during operation

initial operation i

not done

If pressing switc

once more in th

test mode 2 o

temperature of

frost remova

sensor is mor

than

5°C, it

immediatel

returns to the tes

mode for initia

operatio

(COMP operate

after 7 minutes).

When temperature of a frost removal sensor becomes less than 45

°C (In power failure, service)

Test mode 1 (Compulsory function

)

Test mode 1 (Compulsory function

)

Test mode 2 (Compulsory fros

removal)

POWER

COMP

F-FAN

C-FAN

F-FAN

C-FAN

F-FAN

C-FAN

F-FAN

C-FAN

OFF

STEP

MOTOR

DAMPER

STEP

MOTOR

DAMPER

STEP

MOTOR

DAMPER

OPEN

STEP

MOTOR

DAMPER

HOME

BAR

HEATER

POWER

FROST

REMOVAL

HEATER

HOME

BAR/ PIPE

HEATER

OFF

HOME

BAR/ PIPE

HEATER

TEST

S/W

(Press

Once)

COMP

TEST

S/W

(Press

3 times)

0.5

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.5

sec.

0.3

sec.

FROST

REMOVAL

HEATER

OFF

FROST

REMOVAL

HEATER

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

5.6

sec.

OTHER

LOAD

OFF

F-FAN

C-FAN

F-FAN

C-FAN

OFF

STEP

MOTOR

DAMPER

OPEN

TEST

S/W

(Press

2 times)

COMP

0.3

sec.

0.3

sec.

0.3

sec.

OFF

2-9. Function of Trouble Diagnosis(88-LED)

1. Failure diagnosis function is function to facilitate service when nonconforming matters affecting performance of product during use of product.

2. In occurrence of failure, pressing the function adjustment button does not perform function and only alarm sound (“Ding~”) rings.

3. If nonconforming matters occurred are released during display of failure code, MICOM returns to the original state (Reset).

4. Failure code is displayed on the display part of setting temperature for the freezing room and the display part of setting temperature for the cold storage room of LED, which are placed at the display part of a refrigerator. All the LED graphics other than a failure code are turned off.

In display of the failure mode, all LEDs of setting temperature for freezing/ setting temperature for cold storage are turned off (excluding Note1 and Note2).

MICOM FUNCTION

- 11 -

: Normal Operation

Er FS

Er rS

Setting temperature

display (Note 2)

Er dS

Er dH

Er FF

Er CF

Er CO

Setting temperat

ure

display (Note 1)

Setting temperat

ure

display (Note 2)

Setting temperat

display (Note 2)

Failure code display part

Sett

ing

temperature

for freezing

Setting

temperature for

cold storage

No. Item

Contents of failure

Freezer

Fan

Compr essor

Stepping

motor dam

per

Defros t

Hea

ter

M/C roo m

Fan

Product operation status in failure

Failure of free

zer

sensor

Failure of refrigerator sensor 1

Failure of refrigera

tor

sensor 2

Failure of frost removal sensor

Poor of frost removal

Failure of BLDC FAN at freezing room

Failure of BLDC FAN at machine room

Failure of Communication

Failure of Outside Sensor

Failure of ice removal sensor

Failure of ice maker unit

Snapping or short-circuit of freezer sensor

Snapping or short-circuit of refrigerator sensor 1

Snapping or short-circuit of refrigerator sensor 2

Snapping or short-circuit of frost removal sensor

Snapping of frost removal heater or temperature fuse, pull-out of connector (indicated minimum 4 hours after failure occurs)

Poor motor, hooking of wires to fan. Contact of structures to Fan. Snapping or short-circuit of L/wire (if there is no fan motor signal for more than 115 seconds in operation of fan motor

Connection between main PCB and display PCB. Snapping or short-circuit of L/wire. Transmission between main PCB and display PCB. Poor TR and receiving part.

Snapping or short-circuit of outs

ide

temperature perceiving sensor

Snapping or short-circuit of icemaking sensor

Poor motor or Hall IC within ice-maker unit. Snapping or short-circuit of L/Wire. Poor main PCB drive circuit.

Standard

RPM

Stand

ard

RPM

Stand

ard

RPM

Stand

ard

RPM

Stand

ard

RPM

OFF

Standard

RPM

Stand

ard

RPM

OFF

ON for 15minutes

OFF for 15minutes

No frost removal

Open for 10munutes, closing for 15 minutes

Failure Code Display Part

BAISE

FRZ TEMP

EXPRESS FRZ

CHILD LOCK

REF TEMP

Note1) In error of outside sensor, setting temperature for freezing/ cold storage is normally displayed and indicated “Er” on

the outside temperature display part (normally displayed except for the outside temperature display part).

Note2) Nonconforming contents of poor R2 sensor, ice-making sensor and ice-making kit are displayed in LED check, not

indicated on the failure display part (when pressing freezing temperature adjustment button and special freezing button for a second or more).

HOME BAR SENSOR

A A B

C C D D

2-10. Test Function

1. The purpose of test function is to check function of the PWB and product and to search for the failure part at the failure status.

2. Test button is placed on the main PCB of refrigerator (test switch), and the test mode will be finished after maximum 2 hours irrespective of test mode and then is reset to the normal status.

3. Function adjustment button is not perceived during performance of test mode but only warning sounds ring.

4. In finishing test mode, always pull the power cord out and then plug-in it again for the normal state.

5. If nonconforming contents such as sensor failure are found during performance of test mode, release the test mode and display the failure code.

6. Even if pressing the test button during failure code display, test mode will not be performed.

Test 1

Test 3

Test 2

Normal

Status

Mode Manipulation Content Remarks

Press test button once (freezing force mode)

Press test button once at the test mode 2 status (compulsory frost removal mode)

Press test button once at the test mode 1 status (compulsory frost removal mode)

Press test button once at the test mode 3 status (freezing force mode)

1. Continuous operation of compressor

2. Continuous operation of freezing room fan (high speed RPM) and M/C room fan

3. Frost removal heater OFF

4. Full opening status (ba

ffle opened) status of

electronic step motor damper

5. All display LED graphics - ON.

1. Compressor OFF

2. Freezing room fan and M/C room fan is turned off.

3. Frost removal heater ON

4. Full closing status (ba

ffle closed) status of

electronic step motor damper

5. All display LED graphics - OFF (88LED: Except for (A)22 (B)22 LEDs

Bar, Dot LED: Except for only middle Notch Bar Graphics)

1. Compressor OFF

2. Freezing room fan(high speed RPM) and M/C room fan is

turned off.

2. Freezing room fan(normal speed RPM) and M/C room fan is

turned off.

3. Frost removal heater OFF

4. Full closing status (ba

ffle closed) status of

electronic step motor damper

5. All display LED graphics - OFF (88LED: Except for (A)22 (B)22 LEDs

Bar, Dot LED: Except for only middle Notch Bar Graphics)

Return to the initial status.

Compulsory function

Check freezing room fan

Compressor is operated after 7 minutes.

MICOM FUNCTION

- 12 -

•

Return to the normal mode when the defrost sensor is above +5

•

°C

1. Explanation for PWB cir cuit

1-1. Power circuit

Voltage of every part is as follows:

Part VA1 CM1 CM2 CE2 CE4

Voltage 220 Vac 14 Vdc 17 Vdc 12 Vdc

EXPLATION FOR MICOM CIRCUIT

- 14 -

5Vdc

1-2. Oscillation circuit

Oscillation circuit is a circuit with the purpose of generating basic time for clock occurrence for synchronization and time calculation in relation with information transmission/reception of inside elements of IC1 (MICOM). The OSC1 must always use rated parts since if SPEC is changed,time calculated at the IC1 may be changed or no operation is done.

1-3. Reset circuit

The reset circuit is circuit allowing various parts such as RAM inside of MICOM (IC1) to initialize and the whole of function to start from the initial status, when initial power is input or

when power is applied again to MICOM by a spontaneous power failure. ‘LOW’ voltage is applied to the reset terminal of MICOM in the beginning of power supply for a constant time (10ms). Reset terminal during general operation is 5V (No MICOM operates in failure of RESET IC).

2) GC-B207W

The fan motor at the freezing room does not stop but operates if opening doors of the freezing room or cold storage room or the home bar during operation of the fan motor at the freezing room.

(A), (B), (C) and (D) of door switch for the freezing room or cold storage room are connected to the door open sensing circuit toward both ends of switch to determine door open at MICOM.

Since a door switch of the home bar is connected to door switch (C), (D) of the cold storage room, it senses door opening if even one of both is opened.

EXPLATION FOR MICOM CIRCUIT

- 14-

Measuring part (IC4)

Status

The circuit has been only applied to voltage except 220v.

ON Within 1 V

OFF 12 V

Type of Load

Frost Removal

Heater

R-room LAMP

Home-bar Heater

AC Converting

Relay

R-room FAN MOTOR

High speed Normal speed

No.10

No.11

No.12

No.16

No.15 No.13 No.14

COMP

Since door switch sensing switch (A), (B) are a separate switch even if the door switch of the freezing room normally operates, they may fail to sense door opening in the failure of switch at both ends of (A) and (B) or in failure of the L/wire.

Lamp does at the cold storage room not turn on if the door switch of the cold storage room fails to sense the door open switch (c ), (d) or the home bar switch(e ), (f).

EXPLATION FOR MICOM CIRCUIT

- 16 -

Closing 5 V ( A - B , C - D . S/W at both ends are at Off status)

Opening 0 V ( A - B , C - D , S/W at both ends are at On status)

Measuring part

IC1 (MICOM) No. 47, 46 Pin

Door of Freezing/Cold Storage Room

CONDITIONS

Bell sounds when button on Beep sounds when warning

MEASURING

dosplay is pressed. door opening.

OFF

POINTS

IC1 (No. 50 Pin) 0 V

0.05 s

2.63 kz (DING)

2.63 kz (BEEP)

OFF

2.21 kz (DON

0.2 s 0.1 s 0.4 s 0.5 s 0.5 s

5 V

0 V

5 V

0 V

5 V

0 V

2.Buzzer driving circuit

3.Door opening sensing circuit

, E - F

1-5. Switch entry circuit

The following circuits are entry circuits for sensing signal form test S/W, electronic single motor damper reed S/W for examining refrigerator.

1-6. Option designation circuit (model separation function)

The above circuits are used for designating separation by model as option and notifying it to MICOM. Designation of option by model and the application standards are as follows:

These circuits are accurately pre-adjusted in shipment from factory and so you must not additionally add or remove option.

EXPLATION FOR MICOM CIRCUIT

- 17 -

Separatio n Connection Status Application Standard

Connectio OTHER AREA(VOLATILE)

OP1

OUT Domestic

1-7. Stepping motor operation circuit

Connection DISPENSER MODEL

OP2

OUT NON-DISPENSER MODEL

For motor driving method, rotation magnetism is formed at coils wound on each phase of motor and stator and so motor becomes to rotate if applying “High” signal to the IC6 (TA774AP) at the MICOM PIN 41 and outputting “High”, “Low” signal by step numbers fixed through MICOM PIN 42 and 43.

Explanation) For driving method of the stepping motor, send signals in the cycle of 3.33 mSEC using terminal of MICOM

PIN 33, 34 and 35 as shown in wave form of the following part. These signals are output to the output terminal (No.10, 11, 14, 15) via the input terminal (No. 3, 6, 8) of the IC10 (TA7774F) as IC for motor driving. Output signals allow motor coils wound on each phase of stator to form rotation magnetic field and the motor to rotate. Inputting as below figure to the input terminal (INA, INB) as IC (TA7774AF) for motor driving allows motor coils wound on each phase of stator to form rotation magnetic field and the stepping motor damper to rotate

EXPL A TION FOR MICOM CIRCUIT

- 18-

(Reverse rotation) (Positive rotation)

1-8. Temperature compensation and over-cool/weak- cool compensation circuit

1. Temperature compensation at freezing room, cold storage room

冷藏室温度补偿

冷冻室温度补偿

Freezing room

Temperature compensation

Refrigerator room

Resistance value

(RC F 1

）

Resistance value

(RC F 1

）

Remarks

Reference temperature

Warmly compensate

Coolly compensate

180 kΩ

+5 °C

180 k

+2.5 °C

56 kΩ

+4 °C

56 k

+2.0 °C

33 kΩ

+3 °C

33 k

+1.5 °C

18 kΩ

+2 °C

18 k

+1.0 °C

12 kΩ

+1 °C

12 k

+0.5 °C

10 kΩ

0 °C

10 k

0 °C

8.2 kΩ

-1 °C

8.2 k

-0.5 °C

5.6 kΩ

-2 °C

5.6 k

-1.0 °C

3.3 kΩ

-3 °C

3.3 k

-1.5 °C

2 kΩ

-4 °C

2 k

-2.0 °C

470Ω

-5 °C

470

-2.5 °C

Temperature compensation table by adjustment value (difference value against current temperature) Ex) If changing compensation resistance at a cold storage room (RCR1) from 10 kΩ (current resistance) to 18 kΩ

(modified resistance), temperature at the cold storage will increase by +1°C.

u Temperature compensation table at the refrigerator room is as follows:

u This circuit is a circuit to enter the necessary level of temperature compensation for adjusting different temperature every

model at the cold storage room into MICOM.

EXPLATION FOR MICOM CIRCUIT

- 19 -

470 Ω 2 kΩ 3.3 kΩ 5.6 kΩ 8.2 kΩ 10 kΩ 12 kΩ 18 kΩ 33 kΩ 56 kΩ 180 kΩ

No 0.5 °C1 °C 1.5 °C2 °C 2.5 °C3 °C 3.5 °C4 °C 4.5 °C5 °C

470Ω

change

Up Up Up Up Up Up Up Up Up Up

0.5 °C No 0.5 °C1 °C 1.5 °C2 °C 2.5 °C3 °C 3.5 °C4 °C 4.5 °C

2 kΩ

Down change

Up Up Up Up Up Up Up Up Up

1 °C 0.5 °C No 0.5 °C1 °C 1.5 °C2 °C 2.5 °C3 °C 3.5 °C4 °C

3.3 kΩ

Down

change

Up Up Up Up Up Up Up Up

1.5 °C1 °C 0.5 °C No 0.5 °C1 °C 1.5 °C2 °C 2.5 °C3 °C 3.5 °C

5.6 kΩ

Down Down Down

change

Up Up Up Up Up Up Up

2 °C 1.5 °C1 °C 0.5 ° No 0.5 °C1 °C 1.5 °C2 °C 2.5 °C3 °C

Rerigerator

8.2 kΩ

Down Down Down

Drop

change

Up Up Up Up Up Up

room

2.5 °C2 °C 1.5 °C1 °C 0.5 °C No 0.5 °C1 °C 1.5 °C2 °C 2.5 °C

(RCR1) 10 kΩ

Down Down Down Down Down

change

Up Up Up Up Up

3 °C 2.5 °C2 °C 1.5 °C1 °C 0.5 °C No 0.5 °C1 °C 1.5 °C2 °C

12 kΩ

Down Down Down Down Down Down

change

Up Up Up Up

3.5 °C3 °C 2.5 °C2 °C 1.5 °C1 °C 0.5 °C No 0.5 °C1 °C 1.5 °C

18 kΩ

Down Down Down Down Down Down Down

change

Up Up Up

4 °C 3.5 °C3 °C 2.5 °C2 °C 1.5 °C1 °C 0.5 °C No 0.5 °C1 °C

33 kΩ

Down Down Down Down Down Down Down Down

change

Up Up

4.5 °C4 °C 3.5 °C3 °C 2.5 °C2 °C 1.5 °C1 °C 0.5 °C No 0.5 °C

56 kΩ

Down Down Down Down Down Down Down Down Down

change

5 °C 4.5 °C4 °C 3.5 °C3 °C 2.5 °C2 °C 1.5 °C1 °C 0.5 °CNo

180 kΩ

Down Down Down Down Down Down Down Down Down Down

change

Modification

resistance

Current resistance

1-9 . Compensation circuit for weak-cold, over-cold at freezing room

The above option circuit is a circuit to compensate for temp erature at the cold storage room by simply cutting in service.

Compensation Compensation

for weak-cold for over-cold

Temperature compensation value

Remarks

JCR3 JCR4 JCR1 JCR2

at cold storage room

0 °C (In shipment from factory)

CUT -1 °C

CUT +1 °C

CUT CUT -2 °C

CUT CUT +2 °C

CUT CUT 0 °C

CUT CUT CUT -1 °C

CUT CUT CUT +1 °C

CUT CUT CUT CUT 0 °C

EXPLATION FOR MICOM CIRCUIT

- 19 -

Temperature compensation in CUT

JCR1

+1?

JCR2

+1?

+2?

JCR3

-1

JCR4

-1

-2

1-10. Key Button Input and Display Lighting Circuit

This circuit is to judge the work of function control button on the operation panel and to light each function indication led (LED module). It is driven by SCAN method.

EXPLATION FOR MICOM CIRCUIT

- 21-

1-11 Sensor resistance characteristics table

u Resistance value allowance of sensor is ±5%. u When measuring the resistance value of the sensor, allow the temperature of that sensor to stabilize for at least 3 minutes

before measuring. This delay is necessary because of the sense speed relationship.

u Use a digital tester to measure the resistance. An analog tester has to great a margin of error. u Resistance of the cold storage sensor 1 and 2 shall be measured with a digital tester after separating CON8 of the PWB

ASSEMBLY and the MAIN part.

u Resistance of the freezing sensor shall be measured with a digital tester after separating CON7 of the PWB ASSEMBLY

and the MAIN part.

EXPLATION FOR MICOM CIRCUIT

-22 -

Measuring Temperature ( °C) Freezing Sensor

Refrigerator sensor 1&2

Defrost sensor, Ambient sensor

-20 °C 22.3 kΩ 77 kΩ

-15 °C 16.9 kΩ 60 kΩ

-15 °C 13.0 kΩ 47.3 kΩ

-5 °C 10.1 kΩ 38.4 kΩ

0 °C 7.8 kΩ 30 kΩ

+5 °C 6.2 kΩ 24.1 kΩ

+10 °C 4.9 kΩ 19.5 kΩ

+15 °C 3.9 kΩ 15.9 kΩ

+20 °C 3.1 kΩ 13 kΩ

+25 °C 2.5 kΩ 11 kΩ

+30 °C 2.0 kΩ 8.9 kΩ

+40 °C 1.4 kΩ 6.2 kΩ

+50 °C 0.8 kΩ 4.3 kΩ

2.PWB Parts Drawings and List

2-1.PWB Assembly Main Parts Drawings

EXPLATION FOR MICOM CIRCUIT

+ 50 hidden pages

LG GR-B207WVQ.CSWQAGE Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual