SAMSUNG SR-S20FTD Service Manual

Model :	SR-S2026C	(D	)	SR-S2226C
	SR-S2027C	(D	)	SR-S2227C
	SR-S2028C	(D	)	SR-S2228C
	SR-S2029C	(D	)	SR-S2229C

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)

(D ) (D ) (D ) (D )

REFRIGERATOR		Contents
1.	Product Specification
2.	Safety Warning & Caution
3.	Specification of Electric Components
4.	Circuit Diagram
5.	Dimension & Part Name of Refrigerator
6.		Freezing Cycle & Cold Air Circulation
		Course in Refrigerator
7.	Function & Operating Instruction of Refrigerator
8. Operating Principle of Circuit
9.		Trouble Checkup & Repair Method
10. Operation Principle & Repair Method of ICE-MAKER
11.		Reference
12.		Disassembly Method of Freezer & Refrigerator
13.		Method of Hinge up Assembly & Disassembly
14.		Refrigerator Exploded view & List
15.		Machine Room Assembly Specification
16. Disassembly & Assembly Method of Internal Part of
		Electric Field Box
17.		Installation Method of Water Supply Tube

18. Installation of the Water Dispenser Line

19. PCB Circuit Diagram and Service Components List

20. Specification of Principal Part of Circuit

1. Product Specifications

Item

Specification

SR-S2026C(D)

SR-S2025C(D)

SR-S2027C(D)

SR-S2028C(D)

SR-S2029C(D)

Model

SR-S20NTC(D)

SR-S20YTC(D)

SR-S20BTC(D)

SR-S20DTC(D)

SR-S20FTC(D)

Basic

Water Dispenser

Basic &

H/B

Dispenser

Dispenser

&

H/B

Total

562

l

547

l

540

l

Net Capacity

Refrigerator

349

l

336

l

349

l

Freezer

213

l

211

l

191

l

Net dimension(W×H×D)

908mm

719(724)mm

1760mm

Rated Frequency and Frequency

230

240V/50Hz

Motor Rated Consumption Power

155W

160W

Electric Heater Rated Consumption Power

400W

410W

412W

412W

422W

Kind of Refrigerator

Indirect Cooling Method Refrigerator

Refrigerant

HFC-134a

Refrigerant Input Amount

190gr

Freezer Performance

(4-STAR)

Product Weight

111Kg

111Kg

117Kg

117Kg

Item

Specification

SR-S2226C(D)

SR-S2227C(D)

SR-S2228C(D)

SR-S2229C(D)

Model Name

SR-S22NTC(D)

SR-S22BTC(D)

SR-S22DTC(D)

SR-S22FTC(D)

Basic

Basic

&

H/B

Dispenser

Dispenser

&

H/B

Total Inside Capacity

599 l

569 l

Net Inside

Freezer

227

l

197

l

Capacity

Refrigerator

372

l

372

l

Outer Size (width

depth height)

908mm

754(759)mm

1760mm

Rated Frequency and Frequency

230

240V/50Hz

Motor Rated Consumption Power

155W

160W

Electric Heater Rated Consumption Power

400W

410W

412W

422W

Kind of

Refrigerator

Indirect Cooling Method Refrigerator

Refrigerant

HFC-134a

Refrigerant Input Amount

190gr

Freezer Performance

(4-STAR)

Product Weight

121Kg

121Kg

127Kg

127Kg

2

2. SAFETY WARNINGS

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

CAUTION/WARNING SYMBOLS DISPLAYED SYMBOLS

Indicates that a

danger of death Warning or serious injury

exists.

Indicates that a risk

of personal injury Caution or material damage

exists.

means “Prohibition”.

means “Do not disassemble”.

means “No contact”.

means ”The things to be followed”.

means “Power cord should be unplugged from the consent”

means “Earth to prevent Electric shock”.

Warning & Caution

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

● It may cause electric shock.

Unplug

Use the rated components	On repair,make sure that the
on the replacement.	wires such as harness are
● Check the correct model,rated	bundled tightly.
voltage,rated current,operating	● Bundle tightly wires in order not to
temperature and so on.	be detached by the external force and
	then not to be wetted.
Rated
components

On repair,remove completely	After repair,check the		Check if there is any trace
dust or other things of	assembled state of		indicating the permeation
housing parts,harness parts,	components.		of water.
and check parts.	●It must be in the same assembled		● If there is that kind of trace,change
● Cleaning may prevent the possible	state when compared with the state		the related components or do the
fire by tracking or short.	before disassembly.				necessary treatment such
					as taping using the
					insulating tape.

3

Place let users know in detail.

Warning & Caution

Do not allow users to put	Do not allow users to store	Do not allow users to store
bottles or kinds of glass in	narrow and lengthy bottles	pharmaceutical products,
the freezer.	or foods in a small multi-	scientific materials,
● Freezing of the contents may inflict a	purpose room.	etc., in the refrigerator.
	● It may hurt users when refrigerator	● The products which temperature
wound.	door is opened and closed resulting in	control should not be stored in the
	falling stuff down.	refrigerator.

Prohibition

Prohibition

Prohibition

Do not allow users to insert	Do not allow users to	Do not allow users to bend
the power plugs for many	disassemble, repair or alter.	the power cord with
products at the same time.	● It may cause fire or abnormal	excessive force or do not
● May cause abnormal generation of	operation which leads to injury.	have the power cord pressed
heat or fire.		by heavy article.
		● May cause fire.

Prohibition	Do not
	disassemble

Do not allow users to store	Do not allow users to install	Make sure of the earth.
articles on the product.	the refrigerator in the wet	● If earthing is not done, it will cause
● Opening or closing the door may	place or the place which	breakdown and electric shock.
cause things to fall down, with may	water splashes.
inflict a wound.	● Deterioration of insulation of
	electric parts may cause electric
	shock or fire.

Prohibition

Earth

4

3. Specifications of Electric Components

Components for Freezer

Room Temperature Sensor Components

Defrost Related Components

	Items
	Models
	Freezing Capacity
				Model
	Compressor			Starting type
				Oil Charge
	Evaporator			Freezer
				Refrigerator
	Condenser
	Dryer
	Capillary tube
	Refrigerant
	Model			Temperature Selection
Freezer	THERMISTOR			-26
	(F-SENSOR)			-20
	502AT			-14
	Model			Temperature Selection
Refrigerator	THERMISTOR			-1
	502AT			3
	(R-SENSOR)
				7

First Defrost Cycle (Concurrent defrost of F and R)

	Cycle	Defrost Cycle(FRE)
		Defrost Cycle(REF)
	Defrost
		Pause time
		F Defrost-		Model
		Sensor		SPEC
	Sensor
		R Defrost-		Model
	Defrost
		Sensor		SPEC
	Thermal-Fuse			Rated
			Operating temperature

Specification

SR-S20.. SR-S22..

(4 STAR)

DK182Q-L2U

R.S.C.R

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 2

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

5

Items

Specifications

Model

SR-S2026, S2226

SR-S20YTC,

SR-S2027, S2227

SR-S2028, S2228

SR-S2029, S2229

SR-S20NTC,S22NTC

SR-S2025

SR-S20BTC,S22BTC

SR-S20DTC,S22DTC

SR-S20FTC,S22FTC

Defrost-Heater(FRE)

Conducting at F Defrosting

230 W

230 W

Defrost-Heater(REF)

Conducting at R Defrosting

110 W

110 W

DRAIN Heater(FRE)

Conducting at F Defrosting

41 W

41 W

DRAIN Heater(REF)

Conducting at R Defrosting

25 W

25 W

DISPENSER Heater

Interlock with F-FAN

-

-

5W

5W

HOME-BAR Heater

Interlock with COMP

-

10W

-

10W

Thermal-Fuse for preventing

overheating of Freezer Defrost-Heater

AC 250V

10A 72

±4

Thermal-Fuse for preventing

overheating of Refrigerator Defrost-Heater

Compressor

DK182Q-L2U

Condenser for

Running

350VAC-5

μF

COMP

Starting

(Package type)

-

Starting-Relay

Model

J531Q35E330M385-2

Components

Operation

33 Ω±20%

Model

4TM265RFBYY-53

Over-load Relay

Electric

Temp. ON

130

±5

Temp. OFF

69 ±9

Rated Voltage

230V/50,60Hz

MOTOR-BLDC(FRE)

240V/50Hz UDQMOO2H4ASS

MOTOR-BLDC(REF)

240V/50Hz UDQMOO2H4ASS

MOTOR-BLDC (Circuit)

240V/50Hz UDQMOO2H4ASS

Lamp(FRE)

AC240V/25W

Lamp(REF)

AC240V/25W

×2

Door Switch

AC250V 0.5A

×2

Door Switch (HOME-BAR)

AC250V

0.5A

Dispenser Switch

DECO 250VAC 6A

Power cord

AC250V

12A

Earth Screw

BSBN (BRASS SCREW)

6

4. Circuit Diagram

For Basic

With Home Bar Models

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

Reference

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

7

For Dispenser

With Home Bar Models

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

Reference

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

8

5. Dimension part name of refrigerator

5-1) Product Dimension	(SR-S2025, S2-YTC)
	(SR-S2025, S20YTC

MODEL	“A”	“B”		“C”	“D”
SR-S2025C, S20YTC	719	50	55		54
SR-S2025D, S20YTC	714	50	50		54

9

5-2) Product Dimension	(SR-S2026, S2027, S2226, S2227/S20NTC,S20BTC,S22NTC,S22BTC)
	(SR-S2027, S2227)
	-S20BTC,S22BTC

MODEL	“A”	“B”		“C”	“D”
SR-S2026C, S2027C/S20NTC,S20BTC(D)	719	50	55		54
SR-S2026D, S2027D/S20NTC(D),S20BTC(D)	714	50	50		54
SR-S2226C, S2227C/S22NTC,S22BTC(D)	754	85	55		89
SR-S2226D, S2227D/S22NTC(D),S22BTC(D)	749	85	50		89

10

5-3) Product Dimension	(SR-S2028, S2029, S2228, S2229/S20DTC,S20FTC,S22DTC,S22FTC)
	(SR-S2029, S2229)
	-S20FTC,S22FTC

MODEL	“A”	“B”		“C”	“D”
SR-S2028C, S2029C/S20DTC,S20FTC(D)	719	50	55		54
SR-S2028D, S2029D/S20DTC(D),S20FTC(D)	714	50	50		54
SR-S2228C, S2229C/S22DTC,S22FTC(D)	754	85	55		89
SR-S2228D, S2229D/S22DTC(D),S22FTC(D)	749	85	50		89

11

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

12

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

13

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

14

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

15

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

16

6. Freezing Cycle & Cold Air Circulation Course in Refrigerator

6-1) Freezing Cycle
COMPRESSOR		WIRE-COND	SIDE CLUSTER PIPE		HOT PIPE	DRYER
CAPILLARY TUBE		REFRIGERATOR EVAPORATOR		FREEZER	EVAPORATOR
ACCUMULATOR	SUCTION PIPE			COMPRESSOR
		REFRIGERATOR EVAPORATOR
					SIDE CLUSTER PIPE
ACCUMULATOR
SUCTION PIPE
						HOT-PIPE
FREEZER
EVAPORATOR
COMPRESSOR
WIRE-CONDENSER
					CAPILLARY TUBE
		DRYER
					HOT-PIPE

17

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

FREEZER

REFRIGERATOR

18

7. Function & Operating Instruction of Refrigerator

7-1) Temperature Control Function

1) Basic and with Home Bar Models

2) Dispenser and with Home Bar Models

7-2) Temperature Control Function

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.

Division	At Initial Power On	One Time Press	●	●	●	6 Times Press	7 TimesPress	●	●	●	12 TimesPress
Display	-20˚C	-21 ˚C				-26˚C	-14 ˚C				-19˚C
Change

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	●	●	●	4 Times Press	5 TimesPress	●	●	●	8 TimesPress
Display	3 ˚C	2 ˚C				-1˚C	7 ˚C				4 ˚C
Change

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

19

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.

7-3) Function of Quick Freeze & Vacation

●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.

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.

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.

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.

20

7-4) Alarm Function

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.

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.

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

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.

Afterward defrost cycle is changeable according to use condition or surrounding environment from 6 hrs. to 38 hrs..

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.

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.

21

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

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.

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.

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.

22

7-7) Self-diagnosis Function

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

Defect of

wire connecting system due to

When

temperature sensing

of

R-

01

badness of

Open/Short related aspect of

sensor

is

more

than +50

and

less

SENSOR

Sensor which is equipped

at the

beneath of ice-making bowl

than -50

.

02

Refrigerator

Missing sensor housing of R-room,

Defect is indicated when

temperature

contact defects, disconnection of wires,

sensing of

R-sensor is more than

+50

R-sensor

defect of short-circuit sensor itself, etc.

and less than -50

.

03

Refrigerator

Missing sensor housing of R-room,

Defect is indicated when temperature

defrost sensor

contact defects, disconnection of wires,

sensing of R-sensor is more than +50

defect

of short-circuit sensor itself, etc.

and less than -50

.

R-fan motor

Interference of Fan due to frost, etc.,

Occurrence of the case where Fan Motor of

04

inner refrigerator room becomes to operate

un-insertion of connector,

Error

under about 600rpm at the normal operation

disconnection, etc.

condition or stops driving.

05

ICE-MAKER

Defect of micro S/W in Gear box,

When normal operation is not done until ice-

motor, gear and other defect in wire

isolating motion

is attempted

3 times (only

KIT

system

ice-making function

model corresponds).

Outside Air

Missing

of outside air sensor housing inside of PCB

Badness is

indicated

when temperature sensing

06

base of

top part of Refrigerator,

contact defect,

of

Outside Air Sensor

is more than +50

and

Sensor

disconnection of wires, defect of

short-circuit sensor

less

than -50

.

itself, etc.

07

Freezer

Missing sensor housing in

F-room,

Defect is indicated when temperature

contact defects, disconnection of wires,

sensing of F-sensor is more than

+50

F-sensor

defect of short-circuit sensor itself, etc.

and less than -50

.

08

Freezer

Missing

defrost-sensor housing in evaporator of

Defect

is indicated when temperature

F- room, contact defects, disconnection of

wires,

sensing of F-sensor is more than +50

defrost-sensor

defect

of short-circuit sensor itself, etc

and less than -50

.

09

F-fan motor

Interference of Fan due to frost, etc.,

Occurrence of the case where Fan Motor of inner freezer

un-insertion of connector,

room becomes to operate under about 600rpm at the

Error

disconnection, etc.

normal operation condition or stops driving.

10

C-fan motor

Un-insertion of connector,

Occurrence of the case where Comp Cooling Fan

Motor becomes to operate under about 600rpm at

Error

disconnection, etc.

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.

23

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

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).

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.

Time required to indicate is 30 sec.. After 30sec., it is automatically restored to the setup state before its function.

Corresponding display indication about load condition is shown as in the following table.

Load Mode Check List

NO

Display Content

Operation Content

Press both buttons 6 sec, simultaneously, all LED lights are

turned on and off twice.

R-fan

high

R-fan high speed operation indication

At this time press button

.

R-fan

low

R-fan low speed operation indication

R-Def-Heater

R room defrost-heater operation indication

Start Mode

indication operation stage (Not important)

Overload Mode

when

ambient temperature is more than 34

Low-temperature Mode

when

ambient temperature is less than 17

Comp

Comp operation indication

F-fan high

F-fan high-speed operation indication

F-fan low

F-fan low-speed operation indication

F-Def-Heater

F room defrost-heater operation indication

For load under operation, corresponding LED lights on.

C-fan high

C-fan high-speed rotation operation indication

C-fan

low

C-fan low-speed rotation operation indication

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

,

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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.

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.

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.

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 ice-

making 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.

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

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8. Operation Principle of Circuit

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

Terminal	Voltage
Vcc	DC 5V
RESET	DC 5V

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.

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8-4) Door S/W Sensing Circuit

	Terminal	Voltage		MICOM
	F-Room	DOOR CLOSE	5V	(HIGH)
		DOOR OPEN	0V	(LOW)
	R-Room	DOOR CLOSE	0V	(LOW)
		DOOR OPEN	5V	(HIGH)
For door open sensing of F room,	of CN30 is connected to the ground. For			, 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,	of CN30 is connected to the ground. For			,
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

MICOM terminal	Voltage
PIN #56 (F-SENSOR)	MICOM
PIN #57 (F-DEF-SENSOR)	terminal
PIN #58 (R-SENSOR)	voltage
	changes in
PIN #59 (R-DEF-SENSOR)	accordance
	with
PIN #60 (EXT-SENSOR)	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.

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8-6) Key Scan & Display Circuit Part

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.

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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