SAMSUNG SR-S20FTD Service Manual

REFRIGERATOR

Contents

1. Product Specification 2

2. Safety Warning & Caution 3

3. Specification of Electric Components 5

4. Circuit Diagram 7

5. Dimension & Part Name of Refrigerator 9

6. Freezing Cycle & Cold Air Circulation Course in Refrigerator 15

7. Function & Operating Instruction of Refrigerator 17

8. Operating Principle of Circuit 26

9. Trouble Checkup & Repair Method 34

10. Operation Principle & Repair Method of ICE-MAKER 50

11. Reference 55

12. Disassembly Method of Freezer & Refrigerator 60

13. Method of Hinge up Assembly & Disassembly 63

14. Refrigerator Exploded view & List 64

15. Machine Room Assembly Specification 89

16. Disassembly & Assembly Method of Internal Part of

Electric Field Box 90

17. Installation Method of Water Supply Tube 91

18. Installation of the Water Dispenser Line 92

19. PCB Circuit Diagram and Service Components List 93

20. Specification of Principal Part of Circuit 94

Model :

SR-S2026C(D)SR-S2226C(D

)

SR-S2027C(D)SR-S2227C(D

)

SR-S2028C(D)SR-S2228C(D

)

SR-S2029C(D)SR-S2229C(D

)

SR-S2025C(D) SR-S20NTC(D) SR-S22NTC(D) SR-S20BTC(D) SR-S22BTC(D) SR-S20DTC(D) SR-S22DTC(D) SR-S20FTC(D) SR-S22FTC(D) SR-S20YTC(D)

1. Product Specifications

562l 349l 213l

547l 336l 211l

540l 349l 191l

155W 160W

400W 410W 412W 412W 422W

111Kg 111Kg 117Kg 117Kg

Indirect Cooling Method Refrigerator

HFC-134a

190gr

(4-STAR)

908mm ✕719(724)mm ✕1760mm

230 240V/50Hz

SR-S2026C(D)

SR-S20NTC(D)

Basic

SR-S2025C(D) SR-S20YTC(D) Water Dispenser

SR-S2027C(D) SR-S20BTC(D)

Basic

H/B

SR-S2028C(D)

SR-S20DTC(D)

Dispenser

SR-S2029C(D) SR-S20FTC(D)

Dispenser & H/B

NNeett ddiimmeennssiioonn((WW××HH××DD))

Rated Frequency and Frequency Motor Rated Consumption Power

Electric Heater Rated Consumption Power

Kind of Refrigerator

Refrigerant

Refrigerant Input Amount

Freezer Performance

Product Weight

Item

Specification

NNeett CCaappaacciittyy

TToottaall

RReeffrriiggeerraattoorr

FFrreeeezzeerr

MMooddeell

599l 227l 372l

569l 197l 372l

155W 160W

400W 410W 412W 422W

121Kg 121Kg 127Kg 127Kg

Indirect Cooling Method Refrigerator

HFC-134a

190gr

(4-STAR)

908mm ✕754(759)mm ✕1760mm

230 240V/50Hz

SR-S2226C(D)

SR-S22NTC(D)

Basic

SR-S2227C(D) SR-S22BTC(D)

Basic

H/B

SR-S2228C(D)

SR-S22DTC(D)

Dispenser

SR-S2229C(D) SR-S22FTC(D)

Dispenser & H/B

Outer Size (width ✕ depth ✕ height)

Rated Frequency and Frequency Motor Rated Consumption Power

Electric Heater Rated Consumption Power

Kind of Refrigerator

Refrigerant

Refrigerant Input Amount

Freezer Performance

Product Weight

Item

Specification

Net Inside

Capacity

Total Inside Capacity

Freezer

Refrigerator

Model Name

Read all instructions before using this product and keep to the instructions in order to prevent danger or property damage.

2. SAFETY WARNINGS

CAUTION/WARNING SYMBOLS DISPLAYED

SYMBOLS

Indicates that a danger of death or serious injury exists.

Indicates that a risk of personal injury or material damage exists.

means “Prohibition”.

means “Do not disassemble”.

means “No contact”. means ”The things to

be followed”.

means “Earth to prevent Electric shock”.

means “Power cord should be unplugged from the consent”

Pull the power plug out to exchange the interior lamp of the refrigerator.

●●

It may cause electric shock.

Use the rated components on the replacement.

●●

Check the correct model,rated voltage,rated current,operating temperature and so on.

On repair,make sure that the wires such as harness are bundled tightly.

●●

Bundle tightly wires in order not to be detached by the external force and then not to be wetted.

On repair,remove completely dust or other things of housing parts,harness parts, and check parts.

●●

Cleaning may prevent the possible fire by tracking or short.

After repair,check the assembled state of components.

●

It must be in the same assembled state when compared with the state before disassembly.

Check if there is any trace indicating the permeation of water.

●●

If there is that kind of trace,change

the related components or do the

necessary treatment such as taping using the insulating tape.

Warning

Warning & Caution

Caution

Unplug

Rated

components

Do not allow users to put bottles or kinds of glass in the freezer.

●●

Freezing of the contents may inflict a

wound.

❈

Place let users know in detail.

Do not allow users to store narrow and lengthy bottles or foods in a small multipurpose room.

●●

It may hurt users when refrigerator

door is opened and closed resulting in falling stuff down.

Do not allow users to store pharmaceutical products, scientific materials, etc., in the refrigerator.

●●

The products which temperature control should not be stored in the refrigerator.

Do not allow users to insert the power plugs for many products at the same time.

●●

May cause abnormal generation of

heat or fire.

Do not allow users to disassemble, repair or alter.

●●

It may cause fire or abnormal

operation which leads to injury.

Do not allow users to bend the power cord with excessive force or do not have the power cord pressed by heavy article.

●●

May cause fire.

Make sure of the earth.

●●

If earthing is not done, it will cause

breakdown and electric shock.

Do not allow users to install the refrigerator in the wet place or the place which water splashes.

●●

Deterioration of insulation of electric parts may cause electric shock or fire.

Do not allow users to store articles on the product.

●●

Opening or closing the door may cause things to fall down, with may inflict a wound.

Warning & Caution

Prohibition

Do not

disassemble

Earth

THERMISTOR

(R-SENSOR)

502A T

Models

Freezing Capacity

Condenser

Dryer

Capillary tube

Refrigerant

SR-S20..∼SR-S22..

(4 STAR)

FREOL α- 15 (ESTER)

SPLIT FIN TYPE SPLIT FIN TYPE

Forced and natural convection type

Molecular sieve XH-9

0.82×3000, 5.5 Kg/cm

HFC-134a

ON(℃) OFF(℃)

-25.0 -27.0

-19.0 -21.0

-13.0 -15.0

ON(℃) OFF(℃)

0.0 -2.0

4.0 2.0

8.0 6.0 4 hr ± 10 min

12 ~ 24 hr (vary according to the conditions used)

6 ~ 12 hr (vary according to the conditions used)

10 ± 2 min

THERMISTOR (502AT)

5.0㏀ at 25℃

THERMISTOR (502AT)

5.0㏀ at 25℃

AC 250V 10A

77 ± 4℃

Items Specification

Components for Freezer

Room Temperature Sensor Components

Freezer

Model

Temperature Selection

-26℃

-20℃

-14℃

THERMISTOR

(F-SENSOR)

502A T

Model

Temperature Selection

-1℃ 3℃ 7℃

Refrigerator

Defrost Cycle

Defrost Sensor

F Defrost-

Sensor

R Defrost-

Sensor

Thermal-Fuse

First Defrost Cycle (Concurrent defrost of F and R)

Defrost Cycle(FRE) Defrost Cycle(REF)

Pause time

Model SPEC Model SPEC Rated

Operating temperature

Defrost Related Components

Compressor

Model

Starting type

Oil Charge

Evaporator

Freezer

Refrigerator

DK182Q-L2U

R.S.C.R

3. Specifications of Electric Components

Electric Components

230 W 110 W

41 W 25 W

10W

230 W 110 W

41 W 25 W

SR-S2029, S2229 SR-S20FTC,S22FTC

SR-S2028, S2228 SR-S20DTC,S22DTC

AC 250V 10A 72±4℃

Specifications

Items

Model

Conducting at F Defrosting Conducting at R Defrosting Conducting at F Defrosting Conducting at R Defrosting Interlock with F-FAN Interlock with COMP

Defrost-Heater(FRE) Defrost-Heater(REF) DRAIN Heater(FRE) DRAIN Heater(REF) DISPENSER Heater HOME-BAR Heater

Condenser for

COMP

(Package type)

Running

Starting

Model

Operation

Model

Temp. ON

Temp. OFF

Starting-Relay

Over-load Relay

MOTOR-BLDC(FRE) MOTOR-BLDC(REF)

MOTOR-BLDC (Circuit)

Lamp(FRE) Lamp(REF)

Door Switch

Door Switch (HOME-BAR)

Dispenser Switch

Power cord

Earth Screw

Thermal-Fuse for preventing

overheating of Freezer Defrost-Heater

DK182Q-L2U

350VAC-5μF

J531Q35E330M385-2

33Ω±20%

4TM265RFBYY-53

130 ±5℃

69 ±9℃

230V/50,60Hz 240V/50Hz UDQMOO2H4ASS 240V/50Hz UDQMOO2H4ASS 240V/50Hz UDQMOO2H4ASS

AC240V/25W AC240V/25W×2 AC250V 0.5A×2

AC250V 0.5A

DECO 250VAC 6A

AC250V 12A

BSBN (BRASS SCREW)

Thermal-Fuse for preventing

overheating of Refrigerator Defrost-Heater

Compressor

Rated Voltage

SR-S2027, S2227 SR-S20BTC,S22BTC

SR-S2026, S2226 SR-S20NTC,S22NTC

SR-S20YTC, SR-S2025

4. Circuit Diagram

For Basic ＆＆With Home Bar Models

(SR-S2025, S20YTC, S2026, S2027, S2226, S2227/S20NTC,S20BTC,S22NTC,S22BTC)

RED-RED BLU-BLUE ORG-ORANGE P/BLU-PINK/BLUE BRN-BROWN PNK-PINK GRY-GRAY W/BLU-WHITE/BLUE

WHT-WHITE YEL-YELLOW BLK-BLACK PRP-PURPLE W/BLK-WHITE/BLACK S/BLU-SKY/BLUE E-EARTH W/RED-WHITE/RED

Reference

For Dispenser ＆＆With Home Bar Models

(SR-S2028, S2029 S2228, S2229/S20DTC, S20FTC,S22DTC,S22FTC)

RED-RED BLU-BLUE ORG-ORANGE P/BLU-PINK/BLUE BRN-BROWN PNK-PINK GRY-GRAY W/BLU-WHITE/BLUE

WHT-WHITE YEL-YELLOW BLK-BLACK PRP-PURPLE W/BLK-WHITE/BLACK S/BLU-SKY/BLUE E-EARTH W/RED-WHITE/RED

Reference

5-1) Product Dimension

(SR-S2025, S2-YTC)

(SR-S2025, S20YTC

MODEL

SR-S2025C, S20YTC SR-S2025D, S20YTC

“A” “B” “C” “D”

719 714

50 50

55 50

54 54

5. Dimension ＆＆part name of refrigerator

5-2) Product Dimension

(SR-S2026, S2027, S2226, S2227/S20NTC,S20BTC,S22NTC,S22BTC)

(SR-S2027, S2227)

-S20BTC,S22BTC

MODEL

SR-S2026C, S2027C/S20NTC,S20BTC(D) SR-S2026D, S2027D/S20NTC(D),S20BTC(D) SR-S2226C, S2227C/S22NTC,S22BTC(D) SR-S2226D, S2227D/S22NTC(D),S22BTC(D)

“A” “B” “C” “D”

719 714 754 749

50 50 85 85

55 50 55 50

54 54 89 89

5-3) Product Dimension

(SR-S2028, S2029, S2228, S2229/S20DTC,S20FTC,S22DTC,S22FTC)

(SR-S2029, S2229)

-S20FTC,S22FTC

MODEL

SR-S2028C, S2029C/S20DTC,S20FTC(D) SR-S2028D, S2029D/S20DTC(D),S20FTC(D) SR-S2228C, S2229C/S22DTC,S22FTC(D) SR-S2228D, S2229D/S22DTC(D),S22FTC(D)

“A” “B” “C” “D”

719 714 754 749

50 50 85 85

55 50 55 50

54 54 89 89

FFRREEEEZZEERR

LAMP-INCANDESCENT SHELF GUARD TRAY-ICE ICE CASE-BASKET COVER-LEG, FRONT

RREEFFRRIIGGEERRAATTOORR

COVER-GUARD LAMP-INCANDESCENT SHELF TRAY-CHILLED ROOM TRAY-EGG GUARD CASE-VEGETABLE TANK-WATER ASS’Y GUARD-VARIETY

5-4) Part Name (SR-S2025 / SR-S20YTC)

FFRREEEEZZEERR

LAMP-INCANDESCENT SHELF GUARD TRAY-ICE ICE CASE-BASKET COVER-LEG, FRONT

RREEFFRRIIGGEERRAATTOORR

COVER-GUARD LAMP-INCANDESCENT SHELF TRAY-CHILLED ROOM TRAY-EGG GUARD CASE-VEGETABLE

5-5) Part Name (SR-S2026, S2226/S20NTC,S22NTC)

FFRREEEEZZEERR

LAMP-INCANDESCENT SHELF GUARD TRAY-ICE ICE CASE-BASKET COVER-LEG, FRONT

RREEFFRRIIGGEERRAATTOORR

COVER-GUARD LAMP-INCANDESCENT SHELF TRAY-CHILLED ROOM TRAY-EGG GUARD CASE-VEGETABLE HOME-BAR

5-6) Part Name (SR-S2027, S2227/S20BTC,S22BTC)

FFRREEEEZZEERR

ICE-MAKER ICE-CHUTE LAMP-INCANDESCENT SHELF GUARD CASE-BASKET COVER-LEG, FRONT

RREEFFRRIIGGEERRAATTOORR

COVER-GUARD SHELF-WINE LAMP-INCANDESCENT TRAY-CHILLED ROOM SHELF TRAY-EGG GUARD CASE-VEGETABLE

5-7) Part Name (SR-S2028, S2228/S20DTC,S22DTC)

FFRREEEEZZEERR

ICE-MAKER ICE-CHUTE LAMP-INCANDESCENT SHELF GUARD CASE-BASKET COVER-LEG, FRONT

RREEFFRRIIGGEERRAATTOORR

COVER-GUARD SHELF-WINE LAMP-INCANDESCENT TRAY-CHILLED ROOM SHELF TRAY-EGG GUARD CASE-VEGETABLE HOME-BAR

5-8) Part Name (SR-S2029, S2229/S20FTC,S22FTC)

6. Freezing Cycle & Cold Air Circulation Course in Refrigerator

COMPRESSOR WIRE-COND SIDE CLUSTER PIPE HOT PIPE DRYER

CAPILLARY TUBE REFRIGERATOR EVAPORATOR FREEZER EVAPORATOR

ACCUMULA TOR SUCTION PIPE COMPRESSOR

6-1) Freezing Cycle

REFRIGERATOR EVAPORATOR

CAPILLARY TUBE

ACCUMULATOR

FREEZER

EVAPORATOR

SUCTION PIPE

DRYER

WIRE-CONDENSER

HOT-PIPE

COMPRESSOR

SIDE CLUSTER PIPE

6-2) Cold Air Circulation Course in Refrigerator (Cold Air Passage Circulation Course)

FFRREEEEZZEERR

RREEFFRRIIGGEERRAATTOORR

7. Function & Operating Instruction of Refrigerator

7-1) Temperature Control Function

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22)) DDiissppeennsseerr aanndd wwiitthh HHoommee BBaarr MMooddeellss

7-2) Temperature Control Function

① Temperature selecting function of freezer

1) At initial Power On, -20˚C is selected automatically.

2) Select one button for 13 levels of -14˚C -26˚C.

3) 1˚C drops per each pressing of temperature selection button of freezer.

➁ Temperature selecting function of Refrigerator

1) At initial Power On, 3˚C is selected automatically.

2) Select one button for 9 levels of 7˚C -1˚C.

3) 1˚C drops per each pressing of temperature selection button of Refrigerator.

Division

At Initial Power On

One Time Press

● ● ●

6 Times Press

7 TimesPress

● ● ●

12 TimesPress

Display

Change

Division

At Initial Power On

One Time Press

● ● ●

4 Times Press

5 TimesPress

● ● ●

8 TimesPress

Display

Change

˚C

❋ Reference (terms explanation)

1)F Room: freezer 2) R Room: Refrigerator 3) F-FAN: fan motor in freezer 4) R-FAN: fan motor in Refrigerator 5) COMP: compressor

˚C

-1

˚C

-19

˚C

-14

˚C

-26

˚C

-21

˚C

-20

˚C

● Select extra Quick Freeze & Vacation button.

● Whenever Quick Freeze & Vacation button is pressed, selection/ cancellation

(corresponding lamp On/Off) is repeated.

● When Quick Freeze & Vacation is selected, temperature setup of freezer and Refrigerator does not change.

● At state of selecting Quick Freeze & Vacation, change of temperature setup of freezer and Refrigerator is possible.

① Quick Freeze Function

1) When Quick Freeze function is selected, COMP and F-FAN operates continuously for 2 and half hours.

2) While Quick Freeze function is working, Refrigerator operates under present setup condition.

3) When Quick Freeze function is completed (after continuous operation of COMP, F-FAN for 2 and half hours), Quick Freeze lamp lights out automatically and operates according to setup temperature of freezer.

➁ Vacation Function

1) When Vacation is selected, Refrigerator fan is turned off.

2) Though Vacation function is selected, Refrigerator fan does not turned off but turned on for initial 5 minutes.

3) When Vacation function is selected and Ice Timer is set, Vacation function completes automatically when Ice Maker works by Ice Timer function. Then Refrigerator fan operates according to temperature setup of Refrigerator. (explained in detail at Ice Timer function)

4) Vacation function is selected/ canceled by Vacation button. It can be canceled by temperature control button of Refrigerator while Vacation function is selected.

5) While Vacation function is working, Vacation lamp is ON, and temperature display of Refrigerator is OFF.

7-3) Function of Quick Freeze & Vacation

󳢬Reference

Temperature of table on previous page is temperature of center part of 1/3 height of Refrigerator/Freezer compartments. It is temperature data at unload state. When actually used, temperature may differ according to surrounding condition and use frequency. The table displays general characteristic of temperature.

❋ Reference

If Quick Freeze function is selected when freezer temperature is over -10˚C and Refrigerator temperature is over +10˚C like the condition of initial Power ON, Refrigerator Fan becomes OFF until freezer temperature drops under certain temperature. When freezer temperature becomes under certain temperature, Refrigerator Fan operates.

7-4) Alarm Function

① Button Touch Sound (“Ding-Dong” Sound)

1) Input confirmation sound of “Ding-Dong” sounds when each button of Control Panel is pressed.

2) “Ding-Dong” doesn’t sound if more than two keys are pressed at the same time or buttons are wrongly operated.

➁ Door-Open Alarm Sound (“Ding-Dong” Sound)

1) If door of freezer or Refrigerator remains open over 2 minutes, alarm sounds ten times.

2) If door remains open continually afterward, alarm repeats ten times per one minute cycle.

3) Alarm stops immediately when door of freezer or Refrigerator is closed.

➂ Forced Operation & Forced Defrost Alarm Sound (“Beep” Sound)

1) If forced operation or forced defrost is selected, “Beep” sound occurs.

2) If forced operation is selected, alarm sound occurs until automatic cancellation (after 24 hour’s forced operation) or cancellation function is selected.

3) Also in case of forced defrost, alarm sound occurs until defrost is completed (including pause) or cancellation function is selected.

7-5) Defrost Function

① At time of initial Power On, defrost function works for both freezer and Refrigerator at

the same time, when integrating time of Comp On is over 4 hours.

➁ Afterward defrost cycle is changeable according to use condition or surrounding

environment from 6 hrs. to 38 hrs..

➂ After completing the initial defrost, PRE-COOL function works for 20 min. to minimize

temperature increase by defrost work. However, PRE-COOL function is determined according to temperature in Refrigerator at the point of defrost time.

➃ If F-room temperature is over -21˚C, PRE-COOL function works for F-room. If F room

temperature is below -21˚C, PRE-COOL function does not work.

7-6) Test Function

● Test function is for test, process inspection and SVC of PCB and product.

● After selecting test S/W and confirming function of product, turn on power switch

again to operate self-inspection function.

● If you press Quick Freezer Key on Display Panel and temperature control Key in R-room for more than 8 seconds, all Displays will be turned off and continue

operating in Test Mode. At this moment, if any key is pressed among freezer temperature control key, Refrigerator temperature control key, quick freeze key or vacation key, it operates as the test button.

❈ F-room : Freezer, R room : Refrigerator

① Forced Operating Function

1) In the state where display panel was converted into test mode, if test button is selected once, COMP will operate immediately without 5 minute delay function. Therefore, forced operation is conducted at the very moment of COMP OFF, over load may be caused. Please be careful.

2) If forced operation is selected, freezer and Refrigerator is set to automatic, and the temperature of freezer is set to “-26˚C”and Refrigerator is set to

“1˚C”, Comp and F-fan operates continuously, and R-fan in Refrigerator is

controlled by “1˚C”setup.

3) Forced operation is valid for 24hrs. That is, if 24hours. pass after selecting forced operation, simultaneous defrost in both Refrigerator and freezer is automatically carried out. And normal operation is carried out by present setup of Refrigerator and freezer.

4) Cancellation of forced operation in the middle of working is possible by turning on Power after turning it off (resetting), or by selecting test cancel mode shown in the item 3 below.

5) When forced operation works, alarm sound will continue until forced operation is completed. There is no alarm cancel function.

➁ Forced Defrost Function

1) In the state of forced operation, if display panel is converted into test mode and press the test button once more, forced operation is cancelled immediately, and evaporator defrost function of Refrigerator operates.

2) At this time, beep alarm sounds for 3sec. at the point of defrost, and

0.75sec. ON/0.25sec. off sound occurs during forced defrost function of Refrigerator works.

3) If above defrost function of Refrigerator is maintained, it operates normally after defrost is completed.

4) While forced defrost function of Refrigerator operates, pressing the test button once more enables simultaneous defrost for both freezer and Refrigerator.

5) At this time, beep alarm also sounds for 3sec. at the point of defrost, and

0.75sec. ON/ 0.25sec. off sound occurs continually until simultaneous defrost of F and R is completed.

➂ Test Cancel Mode

1) In the state of simultaneous defrost of freezer and Refrigerator, if display panel is converted into test mode, and test button is pressed once more, defrost of both freezer and Refrigeration is cancelled immediately and resumes normal operation .

❈ Reference

It works step by step in test function. It does not change from 1 step (forced operation) to 4 step (test cancel mode) directly. It operates corresponding function only after it goes through the previous step. While test function works, it is most desirable to turn off main power and then turn it on.

7-7) Self-diagnosis Function

① Self-diagnosis Function at the time of initial power is on.

1) When the initial power is applied to Refrigerator, all lamps light and conduct self-diagnosis function internally.

2) If result shows no fault, display will go into the initial normal lighting state.

3) If result shows any fault, corresponding led is turned on and off and alarm sounds.

4) Error sign of self-diagnosis continues until all defects of parts are repaired or self-checkup function is cancelled.

5) If all corresponding parts are repaired completely, display will go into the normal mode state.

6) After repairing Refrigerator, turn on switch again after turning it off to make it sure if Refrigerator is properly repaired.

7) Therefore, in case open & short related problem of sensor needs to be confirmed during A/S, turn off the power of Refrigerator and turned it on again to operate self-Diagnosis function. Then sensor function can be checked.

8) When any defect occurs, corresponding display signs are shown as in the following chart.

NO Items Corresponding LED Defect Content Remark

ICE-MAKER

SENSOR

Defect of wire connecting system due to badness of Open/Short related aspect of Sensor which is equipped at the beneath of ice-making bowl

When temperature sensing of Rsensor is more than +50℃ and less than -50℃.

Refrigerator

R-sensor

Missing sensor housing of R-room, contact defects, disconnection of wires, defect of short-circuit sensor itself, etc.

Defect is indicated when temperature sensing of R-sensor is more than +50 ℃ and less than -50℃.

Defect is indicated when temperature sensing of R-sensor is more than +50℃ and less than -50℃.

Refrigerator

defrost sensor

Missing sensor housing of R-room, contact defects, disconnection of wires, defect of short-circuit sensor itself, etc.

When normal operation is not done until iceisolating motion is attempted 3 times (only ice-making function model corresponds).

R-fan motor

Error

F-fan motor

Error

C-fan motor

Error

Interference of Fan due to frost, etc., un-insertion of connector, disconnection, etc.

Occurrence of the case where Fan Motor of inner refrigerator room becomes to operate under about 600rpm at the normal operation condition or stops driving.

Interference of Fan due to frost, etc., un-insertion of connector, disconnection, etc.

Un-insertion of connector, disconnection, etc.

Defect of micro S/W in Gear box, motor, gear and other defect in wire system

Badness is indicated when temperature sensing of Outside Air Sensor is more than +50℃ and less than -50℃.

ICE-MAKER

KIT

Outside Air

Sensor

Freezer

F-sensor

Freezer

defrost-sensor

Missing of outside air sensor housing inside of PCB base of top part of Refrigerator, contact defect, disconnection of wires, defect of short-circuit sensor itself, etc.

Missing sensor housing in F-room, contact defects, disconnection of wires, defect of short-circuit sensor itself, etc.

Missing defrost-sensor housing in evaporator of F- room, contact defects, disconnection of wires, defect of short-circuit sensor itself, etc

Defect is indicated when temperature sensing of F-sensor is more than +50℃ and less than -50℃.

Occurrence of the case where Fan Motor of inner freezer room becomes to operate under about 600rpm at the normal operation condition or stops driving.

Occurrence of the case where Comp Cooling Fan Motor becomes to operate under about 600rpm at the normal operation condition or stops driving.

Note) This self-Diagnosis works only when the open/short related aspect of sensor is bad. Minute

feature change of sensor is not judged as defect if it does not get rid of the extent of temperature sensor described in Remark so that it is indicated as normal.

➁ Self-Diagnosis Function in Normal Operation

1) Under normal operation of Refrigerator, if you press “Quick freeze”and “Vacation”button at the same time for 6sec., temperature setup display

will proceed On/Off blink of all for 2sec. at 0.5sec. interval. If you press “Quick freeze”and “Vacation”button continuously at the same time for about 8sec. including 2sec. of repetition of LED’s On/Off,

self-Diagnosis function is selected.

2) At this moment, it goes into self-Diagnosis function with“Ding-dong”

buzzer sound.

3) When Error occurs, it is restored to normal state regardless of defect

repairing after signal lasts for 30sec. (“Ding-dong”buzzer sound).

4) While it is operating self-Diagnosis function, it does not accept input of

button.

7-8) Load Condition Indicating Function

① In normal operation, if you press “Quick freeze”and “Vacation”button

at the same time for 6 sec., all setup display of freezer and Refrigerator are turned on. If you hand off from the button at this moment, temperature setup display of freezer and Refrigerator will proceed On/Off blink of all for 2sec. at 0.5sec. interval. While On/Off blink is processing, if you press the temperature setup button, it goes into load condition indicating function (with ding-dong buzzer sound).

➁ Load condition indicating mode shows from which load Micom signal

outputs at present. However, it only shows that micom signal is outputted and does not confirm whether load is actually operating or not. That is, even if load is displayed as it is operating, load may not operate because of actual defect of load or defect of relay on PCB. During A/S, you can use this function by applying the main function.

➂ Time required to indicate is 30 sec.. After 30sec., it is automatically

restored to the setup state before its function.

➃ Corresponding display indication about load condition is shown as in the

following table.

NO Display Content Operation Content

R-fan high R-fan low R-Def-Heater Start Mode Overload Mode Low-temperature Mode Comp F-fan high F-fan low F-Def-Heater C-fan high C-fan low

R-fan high speed operation indication R-fan low speed operation indication R room defrost-heater operation indication indication operation stage (Not important) when ambient temperature is more than 34℃ when ambient temperature is less than 17℃ Comp operation indication F-fan high-speed operation indication F-fan low-speed operation indication F room defrost-heater operation indication C-fan high-speed rotation operation indication C-fan low-speed rotation operation indication

󳢬 Load Mode Check List

Press both buttons 6 sec, simultaneously, all LED lights are turned on and off twice. At this time press button .

󳢬 For load under operation, corresponding LED lights on.

● This function only applies to a model equipped with ice-maker.

● This function is limited to a model from which ice and water can be taken out

from outside without opening door.

① Cube Ice / Crushed Ice/ Stop (Off) Function

1) At the time of intial power on, when inside temperature of freezer is more than 5℃, Cube Ice LED light on display is lit on, and Crushed Ice LED light keeps light-off state. But when power is turned on, if inside temperature of freezer is less than 5℃, Micom recalls form of ice which was set up before power off so that it displays the memorized ice form.

2) “Cube”→“ Crushed”→“ Ice Off”is selected in turn by ice selecting Key.

3) In case of selecting “Crushed”mode, it operates Gear Motor to eject crushed ice to outside when ice lever operates as ice is made in the bowl of ice machine.

4) In case of selecting “Cube”mode, Gear Motor and ice solenoid operate to eject cube ice to the outside when ice lever operates as ice is made in the vessel of ice machine.

5) If “Ice Off”is selected, it stops only ice-making function of ice-maker so that ice is not made.

◆ At the moment of selecting “Ice Off”, ice-making function stops. But, if it is in the process of ice-isolating, returning to horizontal state and supplying water, it maintains stoppage state after water supply is completed.

◆ Even when “Ice-Off”function is operating, ice eject lever operates normally. This is not a defect. Therefore, remained ice in the ice container can be used normally.

② Ice Timer Function

1) If you press ice timer button, it is automatically set to Ice-Off mode regardless of present setup condition of ice mode (Cube / Crushed / Ice Off), and ice lamp is turned on. And time is set to 3 days on temperature control display of freezer at first. And each time you press the ice button, the number increases one by one. And if it reaches 30 days, it resumes from 3 days.

2) Among ice timer functions, if you press ice selecting key, ice timer function is cancelled.

3) If reservation is made by ice timer button, setup temperature of freezer returns to temperature display of freezer after 5sec.. At this moment, if ice timer button is pressed again, it displays the previous reserved date again.1-2 days before the reserved date is completed, ice maker starts operating. And when the reserved date is completed, more than half of ice bucket is filled.

4) If ice timer is reserved and vacation function operates, vacation function ends at the same time when ice timer function ends.

7-9) Function of Ice/Water Dispenser when they are equipped.

5) The following are examples for use.

◆In case of selecting vacation function only If you press “vacation”button, Refrigerator will not operate and freezer will operate only. In case you select this function, take out all foods in the Refrigerator. And “Ice Off”is automatically selected among ice modes, so ice bucket should be empty and water supply valve should be turned off.

◆In case of selecting ice timer function only In case you press “Ice Timer”button to select date as explained above, and not selecting “Vacation”function so that Refrigerator continues to operate, ice mode is selected as “Ice Off”and ice is stored in the bucket when you return. Therefore, do not lock the water supply valve.

◆In case of selecting both vacation and ice timer function In case you press “Ice Timer”button and “Ice Timer”button to select date to select date as explained above, or if you press “Ice Timer”button to select date and press

“Vacation”button afterward, Refrigerator does not operate but freezer operates only,

and ice mode is automatically selected as “Ice Off”. So you must take out all foods in Refrigerator, empty ice in the ice bucket, check water leakage on valves, other hoses and connection parts without locking water supply valve. When “Vacation”function is cancelled, Refrigerator resumes its operation.

③ Ice Dispenser Function (Cover Ice Route Solenoid Valve)

1) After 8sec. from initial power on, solenoid of ice exit operates once. This is the function to prevent interruption of electric service when ice exit is open. So this is not a defect.

2) With turning the dispenser S/W from on to off and ice ejecting is completed, 5sec. after turning off S/W, ice exit is closed because cover ice route solenoid of ice dispenser operates.

④ Water Dispenser Function

1) This function is a system of direct connection with water supply. When water lever is pressed, water solenoid valve which is equipped at the right side of machine room opens so as to operate to eject water. However, it has no function to control on Micom PCB. Therefore, if there happens any defect at water eject function, check and repair solenoid itself, wire connecting connector, connecting tube and state of water supply.

⑤ Water Filter Indicator Function

1) After the initial power on, indication lamp is displayed in green light. After 5 months passed, it is displayed in orange light, and 1 month after this, it is displayed in red light. This is memorized by EEPROM in Micom PCB, so it counts the passed time continually though the power is turned on again after it was turned off.

2) If you press ice selecting button and ice-making stop button at the same time for 25sec. continuously, indication lamp lights in green color. And it becomes orange after 5 months from this moment. And it displays red after 1 month from the moment.

3) If you press ice selecting button and ice-making stop button at the same time for 5 sec., indication lamp is turned off and water filter indicator function stops. At this moment, passed time is not counted.

4) At the state where the function is stopped, if you press ice selecting button and icemaking stop button at the same time for 25sec. continuously, “Green”light is turned on and water filter indicator function will resume. And it becomes orange light after 5 months from this moment. And it displays red light after 1 month from the moment.

1) In case power is applied to prevent customer from nonsense call about initialization of freezer and Refrigerator at -20℃ and 3℃ respectively when

a momentary power stoppage (not a long-term power stoppage) occurs while Refrigerator is operating, it operates in two ways. The first one is initialization by judging the temperature of inside of freezer, and the second one is restoration of operation state.

2) At the initial power on, in case temperature of the inside of freezer is judged as about less than +5℃, it is regarded as momentary power

stoppage during operation. Therefore, functions related with panel display such as Quick Freeze, Vacation, Freezer setup, Refrigerator setup, Ice timer, Form of ice, etc. are restored.

3) At the initial power on, in case temperature of the inside of freezer is about more than +5℃, it is regarded as long-term power stoppage. In this case, panel display is initialized (Quick off, Vacation off, Freezer is set to -20℃, Refrigerator is set to 3℃, Ice timer off, Cube selecting).

4) Ice timer function and water filter indication function are not initialized in case of power stoppage. But during power stoppage, time count does not progress because Micom in PCB does not operate because power source is not supplied.

7-10) Restoring Function of Operation State in case of Power Stoppage

8. Operation Principle of Circuit

Terminal Oscillation Frequency

Xin(#30)

Xout(#31)

4MHz

8-1) Power Source Part

When power is supplied, electric wave is rectified through BD1 to generate voltage of about DC 300V.Top S/W is automatically switched to the optimum condition according to load condition of the second part. When electricity flows between D and S of the top S/W, electricity is generated inside the trans, and when the power between D and S is turned off, electricity which is deserted at trans is transmitted to the second part. This process is repeated to maintain the fixed voltage of 12V by C102 of the second part. This power supplies electricity to power source of 5V, relay and display, and it allows operation of main PCB possible.

8-2) Oscillation Circuit Part

It is oscillation circuit for synchronism clock generation and time calculation on information sending/receiving of internal elements. It does not carry out its normal function because timing system of MICOM alters in case the specification of resonator changes.

8-3) Reset Circuit Part

Reset circuit is a circuit which allows the whole program operate on an initial position by initializing several parts such as RAM inside of MICOM when power is applied to MICOM. When power is supplied, the reset terminal voltage becomes several tens ㎲“LOW”state compared with Vcc voltage (DC 5V) of MICOM, and it maintains “HIGH”(Vcc voltage) state in normal operation condition.

Terminal Voltage

Vcc

RESET

DC 5V

8-4) Door S/W Sensing Circuit

For door open sensing of F room, ② of CN30 is connected to the ground. For ①, Vcc(DC 5V) is supplied through resistance R404(4.7㏀), and “LOW”(0V)/”HIGH(5V) is applied to MICOM by open/close of the F room door so that it can sense open/close of the F room door. For door open sensing of R room, ⑥ of CN30 is connected to the ground. For ⑤, Vcc(DC 5V) is supplied through resistance R403(4.7㏀), and “LOW”(0V)/”HIGH(5V) is applied to MICOM by open/close of the R room door so that it can sense open/close of the R room door. At this time, if there is any defect at the door S/W, the corresponding fan inside the Refrigerator does not work or alarming function works. Therefore, the door S/W must be checked in case of A/S. That is, if door opens, the corresponding fan inside the Refrigerator stops without fail. When connection point of S/W has defect, MICOM judges that door is open so that it stops the fan though the door is closed.

8-5) Temperature Sensing Circuit Part

Terminal

Voltage

MICOM

F-Room

DOOR CLOSE

DOOR OPEN

5V (HIGH)

0V (LOW)

R-Room

DOOR CLOSE

DOOR OPEN

0V (LOW)

5V (HIGH)

MICOM terminal Voltage

PIN #56 (F-SENSOR)

PIN #57 (F-DEF-SENSOR)

PIN #58 (R-SENSOR)

PIN #59 (R-DEF-SENSOR)

PIN #60 (EXT-SENSOR)

MICOM

terminal

voltage

changes in

accordance

with

temperature.

Sensor uses thermistor which has temperature coefficient of negative resistance. When temperature rises, resistance value gets smaller, and when temperature falls, resistance value gets larger. R306~R310, C301~C305 are parts for noise prevention, which are not related to temperature sensing characteristic. In case of F-SENSOR, if setup voltage inputted to MICOM Referred to as Vf, Vf= (Rth*Vcc)/(R303+Rth). Here, Rth is resistance value of thermistor corresponding to temperature. See conversion table of

“Refer 6”of this manual on resistance and voltage of sensor about temperature for

Reference. As terminal voltage of MICOM corresponding to temperature is also designated, Refer to it at A/S time.

8-6) Key Scan & Display Circuit Part

① Key Scan and Display Operation

As is seen on each wave form of the following, send “HIGH”output in an order of MICOM PIN NO #3→#4→#5→#6→#7→#8 for 2msec in a cycle of 12msec using six terminals of MICOM NO #3, 4, 5, 6, 7, 8. This signal appears onto output terminal through input terminal of IC05(UDN2981 or KID65783AP). At this time, peak-to-peak voltage of the spherical wave is about 11V(DC RMS1.5), and form of output wave form is like the drawing 1.

② Key Scan

When the wave form of GRID#2 is outputted, this signal is provided to SW6 button through the resistance of 10㏀. When SW6 is pressed at this time, signal gets smaller by R501(12㏀), and about 4.5V of peak-to-peak voltage is applied to MICOM.

MICOM judges that the wave form of GRID#1 is inputted, and changes function corresponding to SW6 KEY. In this way, each wave form of GRID is recognized.

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