Samsung SR-L677EV, SR-L679EV, SR-L629EV, SR-L627EV Service Manual

REFRIGERATOR

Model : SR-L677EV

SR-L679EV SR-L627EV SR-L629EV

REFRIGERATOR CONTENTS

1. Precautions

2. Product Specifications

3. Electrical Part Specifications & Standard

4. Circuit Diagram

5. Functions & Operating Instruction

6. Circuit Descriptions

7. Trouble shooting

8. Exploed View

9. Disassembly & Assembly

10. PCB Circuit Diagram

11. PCB Parts List

12. Specifications of Main Components

SR-L677EV SR-L679EV SR-L627EV SR-L629EV

GREEN

Warning : Please abide by the following

precautions in order to conduct the maintenance procedures in a safety fashion.

1-1.

Caution when you replacing compressor.

• Do not smoke. Remove all the possible ignition sources and then replace compressor in wellaired places.

• Don’t use welding machines if R600a refrigerant does not exposed.

• In the case of gas leakage, always open the windows.

• When cutting the SUCTION, DISCHARGE pipe of the compressor, always take caution of the inner pressure of the remaining gas.

1-2. Take out the power plug

• Always take out the power plug from the outlet when doing repairs.

1-3. Be careful of electric shocks

• When inspecting the circuit, don’t touch the battery charger and be careful of electric shocks.

1-4. Use proper components

• Always use the component labeled in the service component chart when replacing components for repairs.

1-5. Use proper tools

• Always use proper tools for repairs. If worn out tools are used, it would cause defects in tuning and electrical contact, leading to accidents.

1-6.

When doing repairs, inspect the POWER

CORD or whether there is fire in the lead wire

and make sure they are replaced.

1-7. Cutting of LEAD-WIRE

• For connecting the lead-wire that has been cut off, use soldering or connector and always disconnect the vinyl tapes.

1-8. Check for disconnection

• After completing the assembly, always measure the disconnection resistance level, and turn on the power after checking it is above 1MΩ.

1-9. Earth

• Check the status of earthing and repair the incomplete ones.

1-10. Be careful of children

• There is always the possibility of danger when doing repairs so make sure that children can’t come nearby.

Cleaning : After completing repairs, clean

the surrounding area and the refrigerator and tell the consumer about the repairs being made.

This appliance contains a small amount of the refrigerant isobutane(R600a), a natural gas with high

environmental compatibility but which is also combustible. When transporting and installing

the appliance, care should be taken to ensure that no parts of the refrigerating circuit are damaged. Refrigerant squirting out of the pipes could ignite or cause an eye injury. If damage occurs nevertheless, avoid any flames or potential sources of ignition, and air the room in which the appliance is standing for several minutes.

• In order to avoid the creation of a flammable gas-air

mixture if a leak in the refrigerating circuit occurs, the size of the room in which the appliance may be sited depends upon the amount of refrigerant used. The room must be 1m

in size for every 8 g of refrigerant R600a inside the appliance. The amount of refrigerant contained in your particular appliance is shown on the identification plate inside the appliance.

• Never start up an appliance showing any signs damage. If in doubt, consult your dealer.

Refers to prohibition.

Refers to prohibition of dismantling.

Refers to prohibition of contact. Refers to guidelines which have to

be followed. Refers to detaching the power plug

from the outlet. Refers to earth connection for

preventing electric shocks.

Warning

Refers to possibility of death or serious injury of a person.

Caution

Refers to possibility of injury of a person or damage to property.

1. Precautions

2. Product Specifications

3. Electrical part specifications & standard

SR-L629EV, SR-L679EV, SR-L627EV, SR-L677EV

230-240V

50HZ

MK4A3Q-L1U

R600a

2GSD(Mineral),

280cc

ID0.82XL3500,

5.10kg/

DC12V

0.5A(S2PF101B)

230-240V

50HZ

DK182Q-L2U

220V

50-60HZ

SK190H-L2U

127V 60HZ

DK172P-L2U

(MK172P-L2U)

DK172C-L2U

(MK172C-L2U)

115V

60HZ

RSCR

R134a

Freol α-15c(Ester), 265cc

(Freol α-10c(Ester), 265cc)

Split Fin & Tube Type Split Fin & Tube Type

Forced & Natural Convection Type

Molecular Sieve XH-9

ID0.82

L3000 4.64kg/cm

BSBN(Brass screw)

AC250V 0.7A, AC125V 1.4A(SSD-6D)

Condenser

Dryer

Capillary tube

Earth screw Door switch

Model

Starting type

Refrigerant

Oil Charge

Freezer

Refrigerator

Evaporator

Compressor

SR-L629EV SR-L679EV SR-L627EV SR-677EV

LMF 2 Door

(4-STAR)

Electronic control

CYCLO-PENTANE CYCLO-PENTANE

A.B.S A.B.S

103Kg 108Kg 102Kg 107Kg

Yes

820

720X1790 (mm) (SR-L629(7)EV)

820

770X1790 (mm) (SR-L679(7)EV)

Model

Type

Freezer performance

Temperature control

Water dispenser

Total

Freezer

Refrigerator

Total

Freezer

Refrigerator

Net Capacity

/(ft3)

Gross Capacity

/(ft3)

Cabinet insulation

Door insulation

Cabinet

Door

Liner

Foam

Net weight

Net dimension

XDX

501(17.69) 143(5.05) 358(12.64) 526(18.57) 168(5.93) 358(12.64)

551(19.46) 161(5.68) 390(13.77) 575(20.30) 185(6.53) 390(13.77)

506(17.87) 143(5.05) 363(12.82) 531(18.75) 168(5.93) 363(12.82)

556(19.63) 161(5.68) 395(13.95) 580(20.48) 185(6.53) 395(13.95)

STANDARD

ITEM

Model

Rated Voltage

Frequency

ITEM STANDARD

6 - 22hr(Vary according to the conditions used) 6 - 11hr(Vary according to the conditions used)

10 ±2min

4hr

10min

THERMISTOR (502AT), SPEC:5.0K

Ω

AT 25˚C

Freezer

Type

F-Sensor

Type

F-Sensor

ON(˚C) –23.5˚C –17.5˚C –12.5˚C

ON(˚C)

2.5˚C

5.5˚C

8.5˚C

Temperature Selection

–25˚C –19˚C –14˚C

Temperature Selection

1˚C 4˚C 7˚C

OFF(˚C)

–26.5˚C –20.5˚C –15.5˚C

OFF(˚C)

–0.5˚C

2.5˚C

5.5˚C

Refrigerator

Defrosting

Sensor

Heater

Fuse

First Defrost Cycle

(Concurrent Defrost of F and R)

Defrost Cycle(FRE) Defrost Cycle(REF)

Pause Time

Freezer-Sensor

Refrigerator-Sensor

FRE Evap-Sensor REF Evap-Sensor

Ambient TEMP-Sensor

Defrost Heater(FRE)

Drain Heater(FRE)

Defrost Heater(REF)

Drain Heater(REF)

TemperatureElectrical parts

242W (115V, 127V, 220V, 240V)

52W(115V, 127V, 220V, 240V)

120W(115V, 127V, 220V, 240V)

38W(115V, 127V, 220V, 240V)

AC250V 10A 77±5˚C

Thermal-Fuse for preventing

overheating of Freezer Defrost-Heater

Thermal-Fuse for preventing

overheating of Freezer Defrost-Heater

230-240V 230-240V 220V 127V 115V

50Hz 50Hz 50-60Hz 60Hz 60Hz

MK4A3Q-L1U DK182Q-L2U SK190H-L2U

DK172P-L2U

(MK172P-L2U)

DK172C-L2U

(MK172C-L2U)

240V/15W 240V/25W

110V-130V/15W

110V-130/30W

Rated Voltage

Frequency

Compressor

Condenser

Over-Load

Protector

ST ARTING-

RELA Y

MOTOR-

FAN

LAMP

ST ARTING

RUNNING

MODEL

TEMP. ON

TEMP. OFF

MODEL

OPERA TION

FRE. REF .

CIRCUIT

FRE. REF .

350V AC, 3.5㎌

4TM232PHBYY -53

125±5

69±9

J531Q35E330M385-2

33±20% IS3210-SNL5C IS3208-SNL5B IS3208-SCL5A

350V AC, 5.0㎌

4TM265RHBYY -53

130±5

69±9

J531Q35E330M385-2

33±20% IS3210-SNL5C IS3208-SNL5B IS3208-SCL5A

350V AC, 8.0㎌

4TM314RHBYY -53

130±5

69±9

J531Q34E220M3502

22±20%

IS3210-SNF*B

IS3208-SNF7D

IS3208-SCF7A

250V AC, 12㎌

4TM435PHBYY -53

125±5

69±9

J531Q33E100M200-2

10±20% IS3210-SNP6D IS3208-SNP6H

IS3208-SC06A

250V AC, 12㎌

J531Q33E100M200-2

10±20% IS3210-SNP6D IS3208-SNP6H IS3208-SCH6A

4TM437RHBYY-53

130±5

69±9

RSCR

4. Circuit Diagram

4-1. 230V-240V/50Hz, 220v/50Hz,60Hz, 127V/60Hz, 115V/60Hz

F-ROOM SENSOR

BLU YEL ORG PRP GRY BLK BRN WHT

S/BLU

CN30

CN10

CN70

CN71

BLK BLK BLK BLK

DC TRANS

THERMAL FUSE

S/BLU

RUNNING CAPACITOR

COMPRESSOR

BRN

WHT

YEL

GRY

W/BLK

ORG

BLU

PNK

RED

GRY

PTC

F-THERMAL FUSE

R-THERMAL FUSE

BLU-BLUE BRN-BROWN E-EARTH GRY-GRAY ORG-ORANGE PNK-PINK PRP-PURPLE RED-RED S/BLU-SKY BLUE WHT-WHITE YEL-YELLOW BLK-BLACK W/BLK-WHITE/BLACK

DEFROST HEATER.F

DEFROST HEATER.R

F-DRAIN HEATER

R-DRAIN HEATER

COMP COOLING FAN

F-ROOM LAMP

R-ROOM FAN

R-LAMP HEATER

F-ROOM FAN

R/LAMP INVERTER

FLUORESCENT LAMP

O.L.P

CN50

BLK BRN REF ORG YEL PNK BLU PRP GRY WHT S/BLU

PANEL PCB

MAIN PCB

R-ROOM SENSOR DEFROST SENSOR.F DEFROST SENSOR.R

F-DOOR S/W

R-DOOR S/W

4-2.

230V-240V/50Hz, 60Hz, 220V/50Hz,60Hz, 127V/60Hz, 50Hz, 115V/50V,60Hz(INVERTER PCB)

5-1. Product Dimension

5. Function & Operating Instruction

MODEL

SR-L679EV SR-L677EV SR-L629EV SR-L627EV

1790 1790 1790 1790

1013.5

1508 1508 1458 1458

755 755 705 705

667 667 617 617

Remarks

"X" "Y" "X" "Y"

"X"

"Y"

5-2. Part Name & Disassembly

• Top tray disassembly

Pull it forward.

Take out food stuffs and pull it out by following the arrow.

Take out the water bottle with the bottom lever pressed.

• Tray disassembly

Pull it out by following the arrow.

• Ice compartment • Vegetable compartment

• Freezing compartment

•

5-3. Circulation of Refrigerant (H.M CYCLE)

Compressor → Sub condenser → Cluster pipe → Hot pipe → Dryer → Capillary tube → R-Evaporator → F-Evaporator → Accumulator → Suction pipe → Compressor

5-4. Cool Air Circulation

2. Temperature control function

1) Temperature selection of freezer compartment ❈ After the initial key selection, it displays the notch which is presently set up, then within 5

seconds re-memorize the key after 1-2) points mentioned below. If there is no input of the key, it moves back to the previous temperature display.

1-1) From -14

˚C

~ -25˚C, each one key is selected in 1˚Cinterval. 1-2) Selection key operation for Freezer is set up orderly. 1-3) Actual temperature is indicated during both Power-On and electrical failure. 1-4) Standard temperature of each stage is as follows.(standard for 1/3 height)

1-5) After key input, seven-segment indication changes immediately but actual function

operates after 10seconds.

2) Temperature selection of refrigerator compartment 2-1) From 7

˚C

~ 1˚C, each one key is selected in 1˚Cinterval.

2-2) After the initial key selection, the former selected temperature is displayed, and within

5seconds temperature selection alters as in 2-3), and when final key input is done, the

final key input temperature converse into a set point after 10 seconds. 2-3) Set up is established orderly according to operation of selection button. 2-4) Actual temperature is indicated during both Power-On and electrical failure. 2-5) Standard temperature of each stage is as follows.(standard for 1/3 height)

2-6) After key input seven-segment indication changes immediately but actual function

operates after 10seconds.

Stage

Temperature

123456789101112

-14˚C -15˚C -16˚C -17˚C -18˚C -19˚C -20˚C -21˚C -22˚C -23˚C -24˚C -25˚C

Stage

Temperature

1234567

7˚C6˚C5˚C4˚C3˚C2˚C1˚C

1. Display design

5-5. Temperature Control and Other Capacity Explanation

3) Quick freeze 3-1) Press the on/off buttons of Quick Freeze so that the lamp of Quick Freeze is light up and

off and then it operates it’s function automatically.

3-2) It does not indicate from initial Power on.

a) When Quick Cool is selected, LED indication will immediately change but actual operation

operates after 10 seconds.

b) When Quick Cool is selected, COMP and R-Fan are operate until the temperature of

refrigerator compartment reached -2°C but the maximum operation time of Quick Cool is 2 hours and 30 minutes. So that, it switches off automatically after 2 hours and 30 minutes.

c) During the operation, the temperature of freezer compartment is controlled automatically

by the selected temperature.

d) Temperature display of refrigerator displays actual temperature.

❈ If you press Quick Freeze and Quick Cool button concurrently, each function operates

independently.

a) When Quick Freeze is selected, LED indication will immediately change but actual

operation operates after 10 seconds. (COMP and FAN operates continuously for 2 hours and 30 minutes and it switches off automatically.)

b) When Quick Freeze is selected, it will operate unconditionally without considering the

temperature of freezer compartment.

c) During the operation, the temperature of refrigerator compartment is controlled

automatically by the selected temperature.

d) Temperature display of freezer displays actual temperature.

4) Quick cool. 4-1) Press the on/off buttons of Quick Cool so that the lamp of Quick Cool is light up and off

then it operates its function automatically.

4-2) It does not indicate from initial Power on.

Change of

light indication

Initial Power On Pressed once time Pressed second time Remark

Off Quick Freeze On Off

Change of

light indication

Inition Power On Pressed Once time Pressed second time Remark

Off Quick Cool On Off

If you choose Quick Freeze or Quick Cool when freezer temperature is more than -10°C and refrigerator temperature is above +10°C just as the initial Power On Condition, it operates differently from what is mentioned above, and this is an exceptional case.

Reference

5) Sabbath function 5-1) It will turn to sabbath function if you press freezer and refrigerator temperatune button

together for 5 seconds. 5-2) When turned to sabbath function, all of the front display of LED turn off. 5-3) The light will not switch on even when the door is opened, and if it was switched on then

it will switch off. 5-4) To cancel the operation, you have to press freezer and refrigerator temperature button

together again for 5 seconds.

❈ This function is used only in special area.

3. Buzzer alarm function

1) Touch button type (ding-dong sound) 1-1) there is "ding-dong" sound to confirm input periodically for each one second for button

operation in each control panel. 1-2) key recognition is within 0.2 sec and "ding" sound beeps in continuous key recognition. 1-3) key recognition sound will first activate in other information.

2. Alarm when door is open 2-1)Alarm melody will run if door of freezer or refrigerator is open for 2 minutes or more. 2-2) If door continue to remain open alarm will run periodically. 2-3) Alarm will immediately stop when door is closed.

3. Forced running alarm and forced defrost alarm (beep sound). 3-1) If forced running, or defrost is chosen, there is a beep sound. 3-2) Once you press forced running test button, it will beep until you choose cancellation or it

cancel automatically (0.25sec ON/0.75sec OFF)

3-3) It will beep even during defrost is complete (include paused time) or until cancel button is

pressed.

3-4) During forced running alarm runs 0.1sec on and 1sec off, and during forced defrost alarm

runs as well 0.5sec on and 0.5sec off.

4. Defrost function

1) Once power is on and COMP is ON for 4 hours, both refrigerator and freezer starts to defrost at the same time.

2) When the defrost time is reached, F-Fan and COMP runs pre-cooling for 20 minutes and starts heating activity then the pause time is operated about 8 ~12 minutes(10±2minutes).

3) Actual defrost period is from minimum 6 hours up to maximum 11 hours, and freezer compartment defrost period is from min. 12 hours up to max. 22 hours instantaneously (COMP ON for additional period).

4) The decision of defrost period is maded by the ambient temperature and the count of door open and the length of door open time.

5) Defrost periods memorize these information at MICOM as a case per hour. Therefore, case of defrost period distinguishes per hour.

6) Influences of count and length of door open for time distinguisher get checked from the door switchs of refrigerator compartment and freezer compartment.

7) If refrigerator compartment temperature is over trset-on+6

˚C

(at ambient temp. is over 21

˚C)

or trset-on+2˚C(at ambient temp is over 33

˚C),

COMP is runned by refrigerator compartrment temperature. In this case, the defrost heater of refrigerator compartment starts after 2 hours running of COMP.

8) After 7) is proceeded, the concurrent defrosting of freezer and refrigerator start after 4 hours 4 hours running of COMP.

9) If defrost operation is reached during quick freeze operation, quick freezer operation is finished first and then defrost operation is proceeded.

5. Test function

❈ Test function is for the test of PCB, product, official inspection and ability of SVC. ❈ When s/w test is chosen and tested the product, you switch off and on again then let it run a

self-test.

1) Function of forced running. 1-1) If you choose PCB button once, COMP will automatically start. 1-2) When forced running is chosen, freezer will show “FF” and “1” in refrigerator automatically.

when this option is selected and 1 minute is past, temperature memorized will not change even if you select defrost or cancel test activation (maintains F:-25˚Cand R:1

˚C

1-3) Forced running will activate only for 24 hours in full-down operation. Freezer and

refrigerator will automatically activate. 1-4) To cancel forced running power is off and on again or select test cancel mode. 1-5) During forced running alarm (0.25sec ON/ 0.75 sec OFF) runs until it is completed. The

alarm will continue without alarm key selection. 1-6) When forced running is selected, quick freeze operation does not activate.

2) Forced defrost function 2-1) When you press test button once more during forced running refrigerator compartment

activates defrost.(R-defrost only) 2-2) If you press button once more, freezer defrost will start at the same time with refrigerator. 2-3) If forced defrost function is selected, forced running will automatically cancel. And after

forced defrost is completed, it will proceed normal operation.

3) Test cancel mode 3-1) When you press test button once more during forced defrost in freezer and refrigerator, it

proceeds normal operation.

3-2) Alarm will stop during test cancel mode.

6. Function of initial Power ON

1) When power ON, refrigerator proceed initial self-test and, if normal, it indicate LED in all

operation panel for 2 seconds.

2) When proceeding self-test and if temperature sensor finds fault sensor, LED displays the

relatecl LED(see table 1.) for periods of 0.5 sec of related LED.

3) Switch on all LED for 2 sec. Initial display of freezer and refriger show actual temperature.

4) Keep condition of R-defrost heater and F-defrost heater for 3 sec for interval of 0.5 sec.

5) If F and R- defrost is finished at initial condition, COMP, F-fan and R-fan activates intervals

with 0.5 sec without inner temperature condition.

7. Power failure compensating function

1) function of notch save. 1-1) When you press quick freeze, quick cool, freezer, refrigerator button, micom save present

operating and display condition. Once the power is re-instated, the appliance will continue to operate at the most recent temperature setting (except test mode.)

1-2) 1-1) Activity proceeds when F-evap. and R-evap. Temperature is below 10

˚C

added together at initial power ON, it will activate, and if its more than 10˚Cit goes back to initial mode activity. Quick freeze, quick cool and Sabbath function get not selected.

1-3) If power gets off during quick freeze, quick cool or sabbath function and then the power is

re-instated, the appliance will proceed quick freeze or quick cool function again at least one of F-evap. or R-evap. temperature is below 10

˚C.

❈ Exhibition mode

1. When you press quick freeze button and freezer temp. button together the operation changes into exhibition mode.

2. In exhibition mode, compressor is immediately off and defrost do not activate.

3. If you press quick freeze button and freezer temp. button together for 5 sec exhibition mode

cancel out and bact to nomal operation.

8. Self-test function

1) Define of the fault temperature sensor : temperature of the sensor is over between -50

˚C

(4.5volt) ~ +50

˚C

(0.5volt)

1-1) Self-test fuction due to power ON.

a) When a power is ON, it internal MICOM will decide faulty in temperature within 1 sec. b) If faulty sensor is found, the “related display LED” switches on and off for 0.5 sec

intervals. And it will not beep (refer to self-test faulty indication table).

c) At the LED situation is the faulty sensor display, self-test function key ( press quick

freezer and quick cool button for 5 sec) is the control of normal temperature is delayed.

d) Fixing default sensor when there is an error, or press quick freeze and quick cool button

for 5 sec., it automatically cancel and activate normally.

2) Self-test function during normal activation a) During normal activation, if you press quick freeze and quick cool key together for 3 sec.

temperature selection display of all ON/ OFF show for 2 sec by 0.5 intervals. Including this 2 sec, press quick freeze and quick cool button together for 5 sec then it select selftest function.

b) If there is ding-dong sound it change into self-test function. If you press refrigerator temp.

selection button during 2 sec display toggle, it proceeds as the display function of the presently operating parts.

c) If there is an error of the sensor, display of the faulty sensor continue for 30 sec then

activate normally (ding-dong alarm activates).

d) Button selecting is not selected during self-test proceeding.

• Open faulty

• Short faulty

• Open faulty

• Short faulty

• Open faulty

• Short faulty

• Open faulty

• Short faulty

• Open faulty

• Short faulty

Symptom

•

Suspected to be below -50

˚C

•

Suspected to be over +50

˚C

•Suspected to be below -50˚C

•Suspected to be over +50˚C

•

Suspected to be below -50

˚C

•

Suspected to be over +50

˚C

•

Suspected to be below -50

˚C

•

Suspected to be over +50

˚C

•

Suspected to be below -50

˚C

•

Suspected to be over +50

˚C

Remark

F-area defroster sensor

F-sensor

Outer sensor

R-area defroster sensor

R-sensor

Item

Freezer

Refrigerator

Display LED

Table 1. Display table of self diagnosis.

9. Display function of the presently operating parts.

1) If you press quick freeze and quick cool button together for 3 sec during normal operation, LED display refrigerator and freezer temperature will show ON/OFF for 2 sec at interval of

0.5 sec

2) At this moment if you take off quick freeze and quick cool button and press refrigerator temp. button (ding-dong sound), it change into the display of the presently operating parts.

3) This display condition is unrelated to actual operation and it is an reference of indication that MICOM commanded operating order).

10. Actual temperature and selected temperature in display function

1) Initial power ON

1-1) When initial power On is set, it reads both inner temperature of freezer and refrigerator.

Display range of freezer is -35

˚C

~+30˚Cand refrigerator -9˚C~+9˚C.

1-2) After this, if freezer inner temperature of a trset_off+1˚Cabove is recognized at least once,

LED display of freezer will change into a set-up temperature. And if refrigerator inner temperature of trset_ off +3.5˚Cabove is recognized at least once, LED display of refrigerator will change into a set-up temperatures. After all this, if freezer inner temperature is above 0˚Cand refrigerator inner temperature above +15˚Cit will proceed display blinking. But blinking operation only starts 10 minutes after it senses its problem with inner temperature.

1-3) During the actual temp. dispaly condition, you choose quick freeze or quick cool function

the LED display will display actual temperature.

2) Stability in inner temperature

2-1) After selected temp. is reached, freezer and refrigerator display the selected temp.

a) If freezer inner temperature is above 0˚Cfor 10 minute, the display of the selected temp.

will blink.

b) If refrigerator inner temperature is above 15

˚C

for 10 minute, the display of the selected

temp. will blink.

c) When quick freeze is chosen, only freezer display will display actual temperature and the

actual temperature displays up to -35

˚C

1 2 3 4 5 6 7 8

9 10 11 12

Include R-fan activation Defrost heater activation Initial power is switched ON Outer temperature is over 35

˚C

Outer temperature is below 20

˚C Exhibition mode is operated together Led ON when COMP activation is included Led ON F-fan activation is included Led ON when F-heater activation is included Led ON when F-lamp activation is included Led ON when R-lamp activation is included Out temperature is about 21

˚C

~34

˚C

Operation Remark

R-fan R-defrost heater Initial start mode Over load mode Low temp.mode Exhibition mode Comp F-fan F-defrost heater F-Lamp R-Lamp Normal mode

Ref. 6.button scan

and display circuitry

(see page 21)

Content

1 st letter “a” led in refrigerator 1 st letter “c” led in refrigerator 1 st letter “d” led in refrigerator 1 st letter “e” led in refrigerator 1 st letter “f” led in refrigerator 1 st letter “g” led in refrigerator 1 st letter “a” led in freezer 1 st letter “b” led in freezer 1 st letter “d” led in freezer 1 st letter “a” led in freezer 1 st letter “b” led in freezer 1 st letter “e”, ”f” led off in refrigerator

Display LED

Table 2. Display table of the presently operating parts.

3) Door open when door is open, the related display shows an actual temperature. 3-1) Display range of freezer is -35˚C~ 30˚Cand refrigerator is -9˚C~9˚C. 3-2) If freezer inner temperature is above 0˚Cfor 10 minute, the display of the selected temp.

will blink.

3-3) If refrigerator inner temperature is above 15˚Cfor 10 minute, the display of the selected

temp. will blink.

3-4) When door is open, 1˚Cwill increase after delay time from the display before door

opens. When door close, 1˚Cwill decrease after delay time if there is a change in inner temperature. Temperature will reach up to presently selected notch.

4) Defrost Display function 4-1) If defrost starts both freezer and refrigerator display the selected temperature. So it will

not blink for 2 hours even if it sensed faulty in inner temperature, after 2 hours it will decide to blink or not.

❈ code for temperature might change due to after the progress in development in products

1 2 3 4 5 6 7 8

9 10 11 12 13

DA41-00099A DA41-00099B DA41-00102A DA26-30111H DA26-30111F DA26-30111C DA32-00006C DA32-00006C DA32-10109H DA32-10105A DA41-00013B DA41-20160A DA41-20148A

PBA MAIN PBA MAIN PBAPANEL

DC TRANS

F, R DEF SENSOR F, R DEF SENSOR R SENSOR F SENSOR

INVERTER PCB

W2 PJT W2 PJT W2 PJT 220~240V/50, 60Hz 105V/50,60Hz 127V/50,60Hz PX-41C PX-41C PX-41C PX-41C 220~240V/50,60Hz 127V/50,60Hz 105~115V/50,60Hz

1 1 1 1 1 1 1 1 1 1 1 1 1

Different according to the source of power

AHAM OPTION

Different according to the source of power

SPEC Q’ty RemarkCODE NO ITEM

(PCB Part List)

State of COMP cooling fan according to the ambient temperature (When COMP. is re-started)

- always OFF COMP cooling fan when ambient temperature is below 5˚C.

- COMP cooling fan always switch ON after 9 minute when ambient temperature is 6

˚C

~10˚C.

- COMP cooling fan always switch ON after 6 minute when ambient temperature is 11

˚C

~15˚C.

- COMP cooling fan always switch ON after 3 minute when ambient temperature is 16˚C~21˚C.

- COMP cooling fan always switch ON when ambient temperature is over 21˚C.

Reference

6-1. Power circuit

6. Circuit Descriptions

Voltage

(DC 12V)

Vcc (DC 5V)

Circuit used

Relay Operation & LED Display

Power around MICOM & Sensor Detector

1) The input AC voltage of DC-trans secondary registers 8V at CN10 between ①~③. The rectified voltage passed through D101 ~ 104 becomes DC 5V through voltage regulator MC7805(REG1). The power(DC5V) is supplied to the power around micom and sensor detector.

2) The input AC Voltage of DC-trans secondary registers 15V at CN10 between ⑤~⑦. The rectified voltage passed throush D105 ~ D108 becomes DC 12V through voltage regulator MC7812CT (REG2). The power (DC12V) is supplied to the relay operation and LED display.

It is designed for clock generation and time calculation for synchronizing transmission and reception on the logic elements inside the MICOM. If the X-TAL specification changes, MICOM may make an error. (The standard components should be used.)

Port

Xin(#19)

Xout(#20)

Oscillating Frequency

4.00MHz

±0.5% Error

When power is supplied to MICOM, reset circuit initializes RAM and other parts on MICOM to initialize all programs. Reset voltage maintains “low” for hundreds of µsec comparing to MICOM Vcc voltage when power is input. It also maintains “high”(5V) during normal operation. But, when Vcc drops to 3.4V-3.7V, reset port becomes “low”.

Port

Vcc

Reset

Voltage

5V 5V

6-2. Oscillator

6-3. Reset Circuit

6-4. Door S/W Detector

1) If door is open, door S/W contact is closed. Then MICOM receives “low” signal and detects door open then, Relay control circuit receives “HIGH” signal and turn Lamp on.

2) If door is closed, door S/W contact is open. Then MICOM receives “high” signal and detects door close then, Relay control circuit receives “LOW” signal and turn Lamp off.

DOOR

Door Conditions

CLOSE OPEN CLOSE OPEN

Door S/W Contact

OPEN

MICOM PIN NO

# 39

# 40

Micom Input Voltage

“HIGH” “LOW” “HIGH” “LOW”

6-5. Temperature Sensor

1) The sensor uses the characteristics of thermistor. If temperature goes higher, resistance goes lower. On the contrary, if temperature goes lower, resistance goes higher .

2) MICOM input voltage is counted by sensor as follows.

CC : 5V, RTH : Sensor reisitance)

3) For the resistance information on temperature and MICOM input voltage, please refer the conversion table. (Page. 41)

RTH

VF = X Vcc

RTH + R301

When Sensor is open

MICOM input “HIGH”

When sensor is cut off

MICOM input “LOW”

( Air Sensor)

At that time, the peak to peak voltage of square signal registers around 12V. The grid #1 ~#5 waveforms are as follows.

6-6. Button scan and display circuitry

If MICOM outputs “high” signal to driver-IC(KID65003AP/S1P2655AØ3) according to each load operation conditions, IC turns on and DC 12V flows to ground through the relevant relay coil. Then, core is magnetized by the coil current, and relay contact switches on. When relay contact is on, AC POWER is supplied to the relevant operation load, then which will be activated. If MICOM outputs “low” signal, load operation stops with the relevant relay contact off.

6-7. Load Operation

Like the above block diagram, operation of F, R defrost heater is detervminedy according to the operation of relay for COMP. When comp relay is connected to NO terminal, comp operates. However, in case of F, R defrost heater, electricity dose not pass through the heater though relay works, But, if Comp relay is connected to NC terminal, comp does not operate and heater gets electrieity according to operation of F, R defrost relay.

RELAY

Load

Comp Operation

Comp off, Defrost-Heater Off

Defrost-Heater On

Comp Off, Defrost-Heater Off

Remark

Defrost-Heater Power Off

Comp Power Off

COMP

on on off off

Defrost Heater

off on on off

6-8. Other option functions

6-9. Option Table

1) Freezer Temperature Shift (Unit ˚C)

SHIFT Reference

-0.5

-1.0

-2.0

-3.0 +1.0 +2.0 +3.0

D601

•

D602

•

D603

•

2) Refrigerator Temperature Shift (Unit ˚C)

SHIFT Reference

-0.5

-1.0

-2.0

-3.0 +1.0 +2.0 +3.0

D604

•

D605

•

D606

•

Temperature and function values are changeable by using main PCB switching diode.

• Note : If possible, do not change because the values have been set in factory. When changing option

functions, power should be turned off. (Only initial power-on allows reading option function)

If possible, do not change because the values have been set in factory. When changing option funcfions, power should be turned off.

NOTE

7. Trouble shooting

1) No power

1. Is the power cord well connected to wall outlet?

2. Refer to the reference

Precautions

Start

Check wires

DC-Trans primary

power input?

Replace DC-Trans

DC-Trans secondary

power input?

Check REG102

(MC7812)

DC 12V output from REG102?

Check REG1

(KA7805)

DC 5V output

from REG1?

Check wire connection Reference 1

(Page. 38)

Are wires connected to

panel securely?

Replace panel PCB

Exchange main PCB

Panel PCB Ass’y

is OK?

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Samsung SR-L677EV, SR-L679EV, SR-L629EV, SR-L627EV Service Manual

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Frequently Asked Questions

User Manual