SAMSUNG S24AHEBBCNEVX Service Manual

Model : SR-S25/26NTA SR-S24/25/27FTA SR-S24/25/27DTA

REFRIGERATOR

CONTENT

1.	Product Specifications	1
2.	Safety Warnings	2
3.	Specifications of Electric Components	4
4.	Electric Circuit Diagram	6
5.	External Size and Designations	10
6.	Refrigeration Cycle and Cool Air Circulation	15
7.	Function and Usage of Refrigerator	17
8.	Circuit Operation Theory	25
9.	Inverter Component List	36
10.	Troubleshooting	37
11.	Instruction of ICE-MAKER Operation and
	Troubleshooting	54
12.	References	62
13.	Disassembly Method of the Refrigerator	67
14.	Assembly and Disassembly of Hinge-Upp
	Ass’y	70
15.	Exploded View of Refrigerator and List	71
16.	Assembled State of Machine Room	115
17.	Disassembly of PCB Panel and Assembly
	of Internal Components	116
18.	Installation of the Water Dispenser Line	117
19.	PCB Circuit Diagram and Service
	Components LIST	119
20.	Specifications of Major Components in Circuit	122

ELECTRONICS

272, Oseon-Dong, Kwangsan-Gu,

Kwangju-City, Korea, 506-253

TEL : [phone], 6812

FAX : [phone]

Samsung Electronics Co., Ltd.

Refrigerator Division 1998. 4

Printed in Korea

DA68 - 60330B REV (0.1)

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

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

	Prohibition	Do not
		disassemble

Do not install the refrigerator	Be sure the earth.	Pull the power plug out for
in the wet place or the place		exchanging the interior lamp
which water splashes.	If earthing is not done, it will cause	of the refrigerator.
	breakdown and electric shock.
Deterioration of insulation of electric	(please refer to page 6).	It may cause electric shock.
parts may cause electric shock or fire.

Earth				Unplug

2

Caution

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

Prohibition

Prohibition

Prohibition

Do not store articles on the	Use the rated components	On repair, make sure that the
product.	on the replacement.	wires such as harness are
		bundled tightly.
Opening or closing of the door may	Check the correct model, rated	Bundle tightly wires in order not to
cause throwing down which may	voltage, rated current, operating	be detached by the external force and
inflict a wound.	temperature and so on.	then not to be wetted.

Prohibition

componentsRated

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

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

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

	Prohibition	Do not
		disassemble

Do not install the refrigerator	Be sure the earth.	Pull the power plug out for
in the wet place or the place		exchanging the interior lamp
which water splashes.	If earthing is not done, it will cause	of the refrigerator.
	breakdown and electric shock.
Deterioration of insulation of electric	(please refer to page 6).	It may cause electric shock.
parts may cause electric shock or fire.

Earth				Unplug

2

Caution

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

Prohibition

Prohibition

Prohibition

Do not store articles on the	Use the rated components	On repair, make sure that the
product.	on the replacement.	wires such as harness are
		bundled tightly.
Opening or closing of the door may	Check the correct model, rated	Bundle tightly wires in order not to
cause throwing down which may	voltage, rated current, operating	be detached by the external force and
inflict a wound.	temperature and so on.	then not to be wetted.

Prohibition

componentsRated

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

1. Product Specifications

	Items					Specification
	Models	SR-S24/25/27FTA				SR-S24/25/27DTA			SR-S25/26NTA
	TOTAL	652 / 701 / 753				656 / 702 / 754				674 / 720
Available
	FREEZER	233 / 254 / 276				233 / 254 / 276				251 / 272
Capacity
	REFRIZERATOR	419 / 447 / 477				423 / 448 / 478				423 / 448
	Dimension	917mm	884mm		1783mm(SR-S24FTA, SR-S25NTA)
(Width x Depth x Height)		917mm	929mm		1783mm(SR-S25/27FTA(DTA), SR-S26NTA)
Rated Voltage & Frequency		110~115V/60HZ			127V/60HZ			220V/50, 60HZ			240V/50HZ
Rated Power Dissipation, Motor							228W
Rated Power Dissipation, Heater							382W
Type of Refrigerator			INTERMITTENT REFRIGERATOR
	Refrigerant					HFC-134a
Refrigerant Mass							200gr
Freezing Capacity						4STAR
		SR-S24/25/27FTA				SR-S24/25/27DTA				SR-S25/26NTA
	Weight
		134kg / 139kg / 141kg				134kg / 139kg / 141kg				125kg / 129kg

1

7. Function and Usage of Refrigerator

7-1. Panel Display

Basic type (NTA)

External type (FTA/DTA)

7-2. Temperature-Control function

1.Temperature-Setting Function of Freezer

1)At the first POWER ON, “MEDIUM” (3rd step) is automatically selected.

2)Select the temperature among five steps, WARMER, (WARMER-MEDIUM), (MEDIUM), (MEDIUM -COLDER), and COLDER by pushing one button.

3)On pushing the button for temperature-setting in freezer, light on the display panel is moved in order from “WARMER” to “COLDER”.

Item	At the first POWER ON	1st push	2nd push	3rd push	4th push	Remark
Change in the	(MEDIUM)	(MEDIUM-COLDER)	COLDER	WARMER	(WARMER-MEDIUM)
display lamp
Specified temperature	app. -19	app. -20	app. -21	app. -16	app. -17.5
in the freezer

2.Temperature-Setting Function of Refrigerator

1)At the first POWER ON, “MEDIUM” (3rd step) is automatically selected.

2)Select the temperature among five steps, WARMER, (WARMER-MEDIUM), (MEDIUM), (MEDIUM -COLDER), and COLDER by pushing one button.

3)On pushing the button for temperature-setting in refrigerator, light on the display panel is moved

in order from “WARMER” to “COLDER”.

Item	At the first POWER ON	1st push	2nd push	3rd push	4th push	Remark
	(MEDIUM)	(MEDIUM-COLDER)	COLDER	WARMER	(WARMER-MEDIUM)
Specified temperature	app. 2	app. 0.5	app. -1	app. 5	app. 3.5
								17		18
in the refrigerator

Notice

The specified temperature in the above table, from data when measured in unload state and at 1/3 H inside the room, is only to describe the temperature at each step generally. The actual temperature depends upon the surrounding conditions and the loading state.

7-3. Power-Freezing and Power-Refrigerating

Notice

If the temperature inside the freezer is above -10 and that inside the refrigerator is

above 10 such as the case of the first POWER ON, Power-Freezing and Power-Refrigerating will not work as you can expect. However, this is not the usual case and so, explanation is omitted here.

17 18

7-4. ALARM function

1.Button TOUCH sound (“DING-DONG” sound)

1)If you push each button on the CONTROL PANEL, “DING-DONG” sounds to confirm the push.

2)If you push two buttons at one time or if you do other wrong-doings, “DING-DONG” does not sound.

2.DOOR-OPEN alarm (“DING-DONG” sound)

1)After two minutes with the door of the freezer or the refrigerator opened, alarm sounds ten times.

2)If the door is still in open in spite of the first ten-time alarm, alarm continues 10 times per minute.

3)The alarm stops immediately when the door of the freezer or the refrigerator is closed.

4)If you select OFF for the alarm (for the model with alarm-off function) (Alarm-lamp out) or if you select OFF for the alarm while alarming, DOOR-OPEN alarm will stop although the door is in open.

5)In spite of the selection of OFF for the alarm, “DING-DONG” for BUTTON-TOUCH operates normally.

3.Forced-operation and Forced-defrost alarm (“BEEP” sound)

1)On the selection of Forced-operation and Forced-defrost, “BEEP” alarm will sound.

2)On the selection of Forced-operation, alarm will continue until the automatic cancellation (after 24-hour Forced-operation) or till the cancellation function is selected.

3)Also, alarm for Forced-defrost continues until the finish of Forced-defrost (including the pause time) or the selection of the cancellation.

7-5. Defrost function

1.On the first POWER ON, concurrent defrost for freezer and refrigerator operates after the accumulated operation time for COMP ON is above 4 hours.

2.Since then, defrost interval will vary from 6 hours to 48 hours according to the operation and the surrounding conditions.

3.After finish of the first defrost, PRE-COOL function operates for 20 minutes at the start of the defrost to minimize the temperature increase caused by the defrost. However, the PRECOOL function depends on the temperature inside the refrigerator at the start of the defrost.

4.If the temperature inside R-room is above 0, PRE-COOL function operates, but if the temperature inside R-room is below 0, PRE-COOL function does not operate. In case of F room, if the temperature is above -21, PRE-COOL function operates and if below -21 , the function does not operated.

5.In the above 4, if the temperature of F-room is above -21(PRE-COOL function condition), PRE-COOL function will be operated both at F and R-room regardless of the condition inside R-room. If the case is only about R-room, PRE-COOL function will be operated independently. It means that PRE-COOL function will be operated only in R-room when only R-room is in the condition for PRE-COOL.

19 20

7-6. TEST function

TEST function is for quality control of PCB and the product, in-process control, and SVC.

After check of the function of the product by the selection of TEST S/W, POWER should be turned ON again to perform self-diagnostic function.

1.Forced-Operation function

1)If you select button on MAIN PCB one time, COMP operates immediately without 5-minute DELAY.

So, attention should be paid because if you perform Forced-operation at the COMP-OFF time, OVER LOAD may occur.

2)On the selection of Forced-operation, “COLDER” for the freezer and “COLDER-MEDIUM” for the refrigerator are selected automatically, COMP and F-Fan are operated on continuous basis, and R-FAN in the refrigerator is controlled by “O(MEDIUM-COLDER)” setting.

3)Forced-operation is effective only for 24 hours. It means that, 24 hours after the start of Forced-operation, concurrent defrost in freezer and refrigerator is conducted automatically and normal operation

starts according to the setting for freezer and refrigerator.

4)To cancel Forced-operation, turn ON again after POWER OFF (RESET) or select TEST CANCELLATION MODE as described in the below “3”.

5)On Forced-operation, alarm (0.5 seconds ON/0.5 seconds OFF) continues to the finish of Forced-operation. There is no cancellation way.

2.Forced-defrost function

1)If you push TEST button one more in Forced-operation state, Forced-operation is immediately canceled and defrost function operates in refrigerator.

2)At this time, BEEP alarm will sound for 3 seconds at the start and continues on 0.75 seconds ON/0.25 seconds OFF basis during R Forced-defrost operation.

3)If you allow the above R-defrost function to operate, normal operation will start after the finish of the defrost.

4)If you push TEST button one more in R Forced-defrost operation, concurrent defrost for R and F-room operates.

5)Also, BEEP alarm will sound for 3 seconds at the start of concurrent R and F-defrost and continues on 0.25 seconds ON/0.75 seconds OFF basis by the finish of concurrent R and F-defrost.

3.Test Cancellation Mode

1)If you push TEST button one more in concurrent R and F-defrost, concurrent defrost will stop and normal operation will start.

Notice

TEST function will operate STEP BY STEP and so, it is not possible to change from 1 STEP (Forcedoperation) to 4 STEP (TEST CANCELLATION MODE). You should go through all STEP to perform the desired function. It is preferred to POWER ON after OFF on operation of TEST function.

19 20

7-7. Self-Diagnosis Function

1.Self-Diagnosis Function on the first POWER-ON

1)On the first Power-on, lamps are ALL ON and self-diagnosis function operates internally.

2)If there is no fault on the self-diagnosis, DISPLAY will show the first normal state.

3)If there is any fault on the self-diagnosis, the relevant LED will flicker and alarm will sound.

4)ERROR (indicating fault) display by the self-diagnosis will continue till all the relevant problems is fixed or the self-diagnosis is canceled.

5)When the relevant problems is solved, DISPLAY will return to the normal MODE.

6)After fixation of refrigerator, power should be off and on again to check whether the fault is corrected.

7)So, if there is a need to check SENSOR OPEN & SHORT for A/S, sensor can be checked through the selfdiagnosis operation by power-off and on.

8)If there is any problem, the relevant DISPLAY is as follows.

	No	Item	Relevant LED	Problem	Remark
			Temperature setting in	OPEN and SHORT type problem with	Temperature by sensor is
		ICE-MAKER			above +50 and
	01		the refrigerator	sensor located at the bottom of ice tray -
		SENSOR	“WARMER” (1st step)	problem with wire connection	below - 50	on the model
					with Ice-Maker
			Temperature setting in	Detach of R-room sensor housing,	Problem display when
		R-Room	the refrigerator		temperature by R-sensor is above
	02			contact problem, wire-snapping, Short,
		R-Sensor	“WARMER-MEDIUM”	R-Sensor fault and so on.	+ 50 and below - 50
			(2nd step)		on the model with Ice-Maker
			Temperature setting in	Detach of R-room sensor housing,	Problem display when
		R-Room			temperature by R defrost-sensor is
	03		the refrigerator	contact problem, wire-snapping, Short,
		Defrost-Sensor	“MEDIUM” (3rd step)	R-Sensor fault and so on.	above + 50 and below - 50		on
					the model with Ice-Maker
			Temperature setting in	Problem with MICRO S/W, Motor,	When normal operation does not
		ICE-MAKER			return in spite of 3 Eject operation
	04		the refrigerator	Gear, and other wiring system inside
		KIT	“COLDER” (4rd step)	Gear Box	on the model
					with Ice-Maker
			Temperature setting in	Detach of Ambient-Sensor housing	Problem display when
		Ambient		inside PCB Base at the top of the	temperature by Ambient-sensor
	05		the freezer
		Sensor		refrigerator, Contact problem, Wire-	is above + 50	and below - 50
			“WARMER” (1st step)
				Snapping, Short, Sensor fault and so on	on the model with ice-maker
			Temperature setting in	Detach of F-Room Sensor housing inside	Problem display when
	06	F-Room	the freezer	PCB Base at the top of the refrigerator,	temperature by F-sensor is above
		F-Sensor	“WARMER-MEDIUM”	Contact problem, Wire-Snapping,	+ 50 and below - 50 on the
			(2nd step)	Short, Sensor fault and so on	model with ice-maker
			Temperature setting in	Detach of Defrost-Sensor housing	Problem display when
		F-Room		inside the evaporator of F-Room,	temperature by F Defrost-sensor
	07		the freezer
		Defrost Sensor		Contact problem, Wire-Snapping,	is above + 50	and below - 50	on
			“MEDIUM” (3rd step)	Short, Sensor fault and so on	the model with Ice-Maker

Note : This self-diagnosis operates when there is OPEN and SHORT type problem with Sensors. If the changes in Sensor are within the ranges of the temperature described in the remarks, they are not

judged to be fault and the appliance operates normally.

21 22

2.Self-Diagnosis function during the normal operation

1)If you push buttons for “POWER-FREEZING” and “POWER-REFRIGERATING” simultaneously for about 3 seconds during the normal operation, ALL ON/OFF in the temperature-setting DISPLAY will continue for about 2 seconds at 0.5-second interval.

If you push buttons for “POWER-FREEZING” and “POWER-REFRIGERATING” simultaneously for about 5 seconds, including 2 seconds for LED ON/OFF, self-diagnosis function is selected.

2)At this time, the refrigerator will return to the self-diagnosis operation with “DING-DONG” alarm.

3)While the self-diagnosis function is in operation, the self-diagnosis will be performed in order from “COLDER”LED of the freezer with ALL ON of the temperature-setting display for the freezer and refrigerator .

4)On ERROR, display will continue for 30 seconds and then, the refrigerator will return to the normal operation state regardless of fixation of the relevant component. (With “DING-DONG” alarm)

5)Button push cannot be inputted during the self-diagnosis operation.

6)Among the items of the self-diagnosis, ERROR CHECK of ICE-MAKER SENSOR and ICE-MAKER function will be done only on the model with the ICE MAKER.

7-8. Load state display function

1.If you push buttons for “POWER-FREEZING” and “POWER-REFRIGERATING” for 3 seconds during the normal operation, all the temperature-setting DISPLAY for the freezer and refrigerator will be on. At this time, if you withdraw finger from the buttons, the temperature-setting DISPLAY for the freezer and refrigerator will be ALL ON/OFF for about 2 seconds at 0.5-second interval. At this time, if you push button for the temperature-setting for the refrigeration

during ON/OFF, load state display function will start (with “DING-DONG” alarm).

2.Load state display MODE shows the load that MICOM signal is outputted. But, it means the output of MICOM signal. It does not show whether the load is actually operated. It means that, in spite of DISPLAY showing the operation of load, there is a possibility of none-operation by fault in the actual load or in RELAY on PCB. So, this function can be practicable on A/S.

3.Display continues for 30 seconds. After 30 seconds, the former-setting state will start automatically.

4.The relevant DISPLAY showing load state are as follows.

			No	Item	Relevant DISPLAY LED	Meaning	Remark
					Load related with the freezer
			1	COMP	Freezer “WARMER”(1st step)	On COMP operation, relevant LED ON
			2	F-FAN	Freezer “WARMER-MEDIUM”	On F-FAN operation, relevant LED ON
					(2nd step)
			3	F-Defroster HEATER	Freezer “MEDIUM” (3rd step)	On F-Defroster HEATER operation, relevant LED ON
					Load related with the refrigeration
			4	R-FAN	Refrigerator “WARMER” (1st step)	On R-FAN operation, relevant LED ON
			5	R-Defroster HEATER	Refrigerator	R-Defroster HEATER operation, relevant LED ON
					“WARMER-MEDIUM” (2nd step)
					Mode display
			6	START MODE	“POWER-FREEZING”	If normal freezing does not operate on the first
21	22			(First mode)		power on, relevant LED ON

No	Item	Relevant DISPLAY LED	Meaning		Remark
7	Overload condition	“POWER-REFRIGERATION”	If the ambient temperature is above 35	,
			relevant LED ON
8	WARMER-temperature	Freezer “COLDER”	If the ambient temperature is below
	condition	(5th step)	17 , relevant LED ON
9	Normal condition	No display LED among	Normal operation state Ambient temperature is
		3 MODE displays means	between 18 and 34 and normal freezing state
		normal MODE

7-9. ICE DISPENSER and WATER DISPENSER function(SR-S24FTA)

23 24

(1)At the moment of selection of stop function, ice-making function stops, but on eject, return to horizontality, and water-supply, stop state will be maintained after finish of water-supply.

(2)When OFF function is selected, ice-making function stops. If you push button to select CRUSHED ICE or CUBE ICE, ICE-MAKER will continue to operate from the stop of ice-making. (This means that icemaking function does not operate from the first.)

(3)In spite of operation of OFF function, ice LEVER will operate normally. This is not the disorder. So, ice left in the tray of the ice-maker can be used normally. On operation of ice LEVER, GERADE MOTOR will operate normally and CUBE ICE can be obtained. (On operation of OFF function, only CRUSHED ICE can be obtained.)

(4)If you want CUBE ICE from the ice left in the tray during OFF function operation, push the button to select CUBE ICE, obtain the ice and then, operate OFF function again.

3.WATER DISPENSER function

1) This function is directly connected to city water and water can be obtained from WATER SOLENOID VALVE by pushing WATER LEVER.

Since there is no function regulated by MICOM PCB, if there is any problem with water dispenser function, check solenoid, connector, and water-supply state.

Notice

With DOOR of freezer open, ice cannot be obtained. This is to prevent from dropping ice into floor when DOOR of freezer opens and ice LEVER is pushed. Contact point in DOOR S/W is used as sensor for opening state of DOOR of freezer. Water dispenser is operated normally regardless of opening of DOOR.

23 24

13. Disassembly method of the refrigerator

13-1) How to disassemble the freezer and refrigerator

				Interior Lamp(REF)
	FTA / DTA
				Remove the cover by rotating( ) driver.
				Remove the lamp by pulling it out and replace new one.
Ice-maker
While supporting the ice-maker at front, lift				After covering, assemble by rotating( ) driver toward the arrow direction.

it slightly toward direction and pull it

straight out toward

direction.

Interior Lamp(FRE)

While pushing toward direction using(-) driver or the likes, make the lamp cover free.

Remove the lamp cover by pulling it down toward direction while holding the back of the cover.

After replacement of the lamp, push the font of the lamp cover back and then the back.

Case-Baskel and Tray Ice		Cover-Tray Water		Case-Veg(LOW) and its cover

After removing the Case-Basket by pulling it out, pull the Tray Ice out.

After opening the doors of the freezer and refrigerator, disassemble the Cover-Tray Water by turnig three screws.

When assembling the Cover-Tray Water, make it fit to three slots and assemble by turning three screws.

Disassemble it by drawing it and lifting it up slightly while holding the knob. () Slide the cover out by pulling it to the front. ()

Cover-Guard

While pushing the cover to the left, slide it out by lifting it up.

Shelf(REF)

While drawing the shelf out, slide it out by lifting it up.

Guide-Bottle(REF)

While holding the Guide-Bottle, disassemble it by lifting it up.

Case-Veg(UPP) and its cover

Disassemble it by drawing it and lifting it up slightly while holding the knob. ()

Slide the cover out by pulling it to the front. ()

67

13-2) Disassembly of

1.After disassembly of the lamp cover for the freezer, disconnect wire housing from the lamp socket.

2.Disassemble and remove two cap-screws using(-) driver or the likes.

3.While holding the bottom of the EVAPCOVER FRONT and drawing it carefully toward the arrow direction, disassemble the cover by sliding it out at the raised spot.( Since the housing for the thermalsensor is located at the rear side of the cover, be careful during disassembly and disconnect the housing.)

4.After disassembly of the EVAP-COVER REAR, disassemble the motor and heater housing from the wire terminal at the top side of the cover.

5.After removing two screws of the COVEREVAP REAR, disassemble it by pulling it

out to the front using(-) driver or the likes. ( Slide the cover out by pushing the held part toward the arrow direction and

drawing it to the front )

68

13-3) Disassembly of Evaporator of Refrigerator

1.Remove all foods in the refrigerator and shelves.

Disassemble two purifier covers using(-) driver or the likes and remove a screw.

2.Detach snaps of the bottom side of the COVER-EVAP FRONT by inserting(-) driver into the snaps and rotating it toward

the arrow direction.

After detachment of the snaps of the EVAPCOVER FRONT, disassemble the cover by pulling it to the front.

3. After detachment of the insulating material, remove screw of damper cover and disassemble by pulling it to the front.

( While disassembling the damper cover, at first disassemble the sensor housing at the left top.)

4. Disassemble the COVER-EVAP REAR by deatching the snaps and pulling it out to the front using(-) driver or the likes.

( While disassembling the COVER-EVAP REAR, be careful because motor wire is connected.)

5. Disassemble the motor and heater housing from the wire terminal at the top side of the cover.

13-4) Temperature controller

SR-S24NTA

Disassemble the temperature controller by	Replace PCB base by disassembling the
detaching the snaps of the front cover of	wire housing connected to PCB and
the temperature controller using (-) driver	removing 3 screws.
or the likes and pulling it to the front.	Assembly is the reverse procedure of
	disassembly.

SR-S24FTA

Disassemble the temperature controller by	Replace PCB base by disassembling the
pulling it out to the front while holding	wire housing connected to PCB and
the bottom side of the front cover of the	removing 3 screws.
dispenser.	Assembly is the reverse procedure of
	disassembly.

14. Assembly and Disassembly of HINGE-UPP ASS’Y

1. Structure of Hinge-Upp Ass’y

2.Assembling procedure of Hinge-Upp Ass’y

1)Place the Hinge-Upp Ass’yon the Reinf-Hinge Upp according to the direction and load the Hinge-Upp Ass’ywhile rotating it to assemble.

2)After assembly of Fixer-Hinge Upp to Reinf-Hinge Upp, finish the assembly by rotating toward the direction.

3.Disassembly procedure of Hinge-Upp Ass’y

1)Disassembly is the reverse procedure of assembly.

69 70

8. Circuit operation theory

8-1. Power supply part

		Voltage	Circuit used
	BLK	Vcc	Power supply for MICOM
GRY
	BLK	(DC 5V)	and peripheral circuit
RED	BLU	V12 Power supply to operate RELAY,
	BLU	(DC 12V)	EJECT MOTOR, DISPLAY

About AC 9V, pressed at 2nd side of LVT(LOW Volt Transformer), is suspended between CN10 ~and DC 5V is made through constant-voltage IC (KA7805) rectified by Rectifier Diode. And, about AC 17V is suspended between CN10~and DC 12V is made through constant-voltage IC(KA7812).

8-2. Power generator circuit part

This is a power generator circuit part to generate synchronous CLOCK for information transfer of MICOM internal degauss and calculate time. On change of spec. of RESONATOR, normal operation cannot be performed from the result of change of TIMMING system in MICOM.

8-3. RESET circuit part

Terminal

oscillation frequency

Vcc

DC 5V

RESET

DC 5V

RESET circuit is to operate overall PROGRAM in the primary state by initializing several parts including RAM in the internal of MICOM when power is supplied to MICOM as a result of power input or instant suspension of electric supply. When power is supplied, voltage at RESET Terminal becomes scores of “Low”state, when compared to the voltage of Vcc (DC 5V) of MICOM. On the general operation state,”High” (Vcc voltage) state is maintained.

25

8-4. DOOR S/W sensing circuit

Terminal

Voltage

MICOM

F-room

On DOOR CLOSE

5V (HIGH)

On DOOR OPEN

0V(LOW)

R-room

On DOOR CLOSE

0V (LOW)

On DOOR OPEN

5V(HIGH)

DOOR OPEN/CLOSE of F-room sensing is performed by connecting of CN30 to GROUND, supplying Vcc (DC 5V) to through resistance R404 (4.7) and supplying “Low” (0V) / ”High”(5V) to MICOM by DOOR OPEN/CLOSE of F-room.

DOOR OPEN/CLOSE of R-room sensing is performed by connecting of CN31 to GROUND, supplying Vcc (DC 5V) to through resistance R403 (4.7) and supplying “Low” (0V) / ”High”(5V) to MICOM by DOOR OPEN/CLOSE of R-room.

If there is any problem in DOOR S/W, Fan in the relevant room will not work and alarm function will operate. So, DOOR S/W should be checked if there is any problem on A/S.

For FAN in the relevant room will stop on DOOR OPEN, if there is any problem in the contact point of S/W, MICOM will judge that DOOR is opened and stop FAN operation, although DOOR is closed.

8-5. Temperature sensing circuit

AMBIENT

MICOM Terminal

Voltage

PIN #58 (F-SENSOR)

Voltage in

PIN #57 (R-EVA-SENSOR)

MICOM

Terminal is

PIN #56 (R-SENSOR)

changed

PIN #59 (F-EVA-SENSOR)

according to

temperature.

PIN #60 (AMBIENT-SENSOR)

		SENSOR works on the basis of the characteristics of THERMISTOR with temperature coefficient of
		negative resistance that resistance value decrease when temperature is High and resistance value
		increase when temperature is low.
		R306 ~ R310 and C302 ~ C306 are parts to prevent NOISE.
		They have no relation with temperature sensing.
		In case of F-SENSOR, when the voltage inputted to MICOM is considered to be Vf, Vf is (Rth Vcc)
		/(R303 + Rth). In this equation, Rth is the resistance value of THERMISTOR corresponding to
		temperature. See the conversion table of the resistance and voltage of sensor according to the
		temperature in the Reference No. 8 of this manual. Use the table on A/S because MICOM Terminal
	26
		voltage is also described in the table.

8-6. KEY SCAN and DISPLAY circuit part

POWER-	POWER-
FREEZING	REFRIGERATING
			Door-Securing ONor
POWER-FREEZING	POWER-REFRIGERATING	F, R ROOM	CRUSHED/CUBE
		DEODORIZATION	POWER REF
		DOOR-SECURING or CUBE	POWER FRE
		COLDER-HUMIDITYor CRUSH	REFRIGERATOR ROOM SETTING'
			FREEZER ROOM SETTING
			Door-Securing OFF or
			LIGHT ON/OFF

REFERRENCE

RED-RED

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

SKY BLUE

1.Running of KEY SCAN and DISPLAY

As shown in the following waveform of each part, “High” output is sent in turn from MICOM PIN

#3 #4 #5 #6 #7 for 2 msec at 10msec interval using five Terminal of MICOM NO #3, 4, 5, 6, and 7. This signal appears at OUTPUT Terminal through INPUT Terminal of IC05 (UDN2981 or UPA2981C).

At this time, PEAK TO PEAK voltage of square-wave is about 11 V (DC RMS 1.5 V) and output waveform is as follows.

2.KEY SCAN

When GRID #1 waveform is outputted, this signal is supplied to the button for temperature-setting of freezing room through resistance 10. At this time, when you push button for freezing room, the signal becomes decreased by R506 (6.8) and about 4.5 V of PEAK TO PEAK voltage is approved to MICOM. After supply

of about 4.5 V of PEAK TO PEAK voltage to MICOM, MICOM can judge that GRID #1 waveform is inputted	27
and then, change the temperature-setting for freezing room. Like this way, each GRID waveform is perceived.

8-7. LOAD OPERATION circuit part

REFERRENCE

RED-RED

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

SKY BLUE

	WHT
RED	GRN		PRP
		Temperature Fuse
		F-Defroster Heater	BRN
	GRY		GRY
RED		F-ROOM LAMP	YEL
RED		Circulation Fan
RED		DISPENSER HEATER
			RED
	RED
		DISPENSER LIGHT	W-BLK
	RED		ORG
		SOLENOID-VALVE
			BLU
			BLU
		COMP-FAN for basic model
RED		Circulation Fan	ORG
	Temperature Fuse
	BLK	R-Defroster Heater	WHT
RED			RED
		Compressor
	PRP		L-BLU
	GRY	HOME BAR HEATER
			BLK

When “High” signal is supplied to INPUT of IC03 (ULN2003A) at MICOM PIN NO #22 (P15), IC comes to be turned on. At this time, if V12 (DC 12V) supplied to the lower COIL of COMP RELAY runs into GROUND through OUTPUT of IC03, magnetic field will occur at CORE and then make contact point ON. This approves 220 V to COMP LOAD to make COMP ON and, if MICOM PIN NO #22 becomes “Low” state, IC comes to be TURN OFF state to make current not running to COMP RELAY COIL, to make RELAY contact point OFF state, and then, finally to stop COMP.

1. Explanation of co-operation of COMP and F, R-Defroster HEATER

	GRY
RED
F-Defroster	R-Defroster
Heater	Heater
COMP load
F-Defroster Heater
R-Defroster Heater

28

Like the above BLOCK DIAGRAM, LINE of AC 220V is connected to RELAY for COMP and COMMON for HEATER RELAY, respectively. At this time, if RELAY is not operated, contact point is NC state and R- Defroster HEATER RELAY is OFF state. So, LOAD maintains OFF state. If COMP becomes the conditions for operation and COMP RELAY is operated (move to contact point NO), COMP becomes closed-circuit and operated and makes power for both ends of F, R-Defroster HEATER OFF state. If F-Defroster HEATER comes to operate, power for both ends of COMP should be OFF.

Purpose of the application of the above circuit : to block all power for both ends of Defroster-HEATER on the operation of COMP and to block all power for both ends of COMP on F-Defroster HEATER.

<Co-operation Table>

	Operation condition	Load condition	Remark
	COMP, Defroster	COMP and F, R-Defroster HEATER OFF
	RELAY ALL OFF
	COMP RELAY operation	COMP ON and F, R-Defroster	Block of power for both ends of
		HEATER OFF	F, R-Defroster HEATER
	F-Defroster HEATER operation	F-Defroster HEATER ON	Block of power for both ends of
		COMP OFF	andCOMP

29

8-8. Various OPTION function

Change of temperature in

D601, 602, 603, 604

the Freezer

Change of temperature in

D605, 606, 607, 608

the Refrigerator

When temperature outside

Freezer is below 17

,

change of compensation

temperature

D611, 612

(condition on low

temperature)

Change of Freezer

NOTCH GAP

D613, 614

(“COLDER” on the basis of

“MEDIUM”)

Change of Freezer

NOTCH GAP

D615, 616

(“WARMER” on the basis of

“MEDIUM”)

Change of Refrigerator

NOTCH GAP

D617, 618

(“COLDER” on the basis of

“MEDIUM”)

Change of Refrigerator

NOTCH GAP

D619, 620

(“WARMER” on the basis of

“MEDIUM”)

The above circuit is to change the items related with temperature and function using 40 SWITCHING

DIODE on MAIN PCB.

Notice

Since products are released from factory after setting of OPTION functions is finished, no change of setting is preferred with the exception of the special case. After change of setting, power should

be turned off and on again.

30

Table of Temperature Change of Freezer (: Relevant DIODE No. used)

Temperature

Relevant DIODE No. used

change D604 D603 D602

Temperature Limit

- 0.5

- 1.0

- 1.5

- 2.0

- 2.5

- 3.0

- 3.5

Temperature	Relevant DIODE No. used
change
	D604	D603	D602	D601
+ 0.5
+ 1.0
+ 1.5
+ 2.0
+ 2.5
+ 3.0
+ 3.5
+ 4.0

Table of Temperature Change of Refrigerator ( : Relevant DIODE No. used)

Temperature	Relevant DIODE No. used
change
	D608	D607	D606	D605
Temperature Limit
- 0.5
- 1.0
- 1.5
- 2.0
- 2.5
- 3.0
- 3.5

Temperature	Relevant DIODE No. used
change
	D608	D607	D606	D605
+ 0.50
+ 1.00
+ 1.50
+ 2.00
+ 2.50
+ 3.00
+ 3.50
+ 4.00

Explanation of Example : In case there is a need to change temperature of Refrigerator , change the

	temperature according to the following procedures.
Step 1	: Since D605 to D608 are used as DIODE for temperature change of Refrigerator,
	check DIODE used at the relevant PCB and the current temperature. For
	example, when D605 and D608 are used, it means the change to + 1.0			when
	compared with the temperature limit described in the above Table.
Step 2	: Determine the temperature to be adjusted according to judgement with regard to
	the request from customers.
	For example, if about 2.0 should be lowered,
Step 3	: Calculate the temperature ; since the current OPTION state is +1.0		as shown in
	step 1 and 2.0	is to be lowered as shown in step 2, add 1.0 to - 2.0	as follows.
	(+ 1.0 ) + (-2.0	) = -1.0
Step 4	: Find out the relevant DIODE No. in the table corresponding to the calculated
	temperature. Since DIODE corresponding to -1.0 is D606, 2.0 can be lowered
					31
	by removing two current DIODE, D605 and D608 and inserting D606.

Change of NOTCH GAP of Freezer (“COLDER” on the basis of “MEDIUM”)

Relevant DIODE No. used

GAP change

D614 D613

2.0

3.0

4.0

5.0

Change of NOTCH GAP of Refrigerator (“COLDER” on the basis of “MEDIUM”)

Relevant DIODE No. used

GAP change

D618 D617

4.0

3.0

5.0

2.0

Temperature compensation when the ambient temperature is below 17

Temperature	Relevant DIODE No. used
change
	D612	D611
- 0.5
- 1.0
+ 0.5
No compensation

Change of NOTCH GAP of Freezer (“WARMER” on the basis of “MEDIUM”)

Relevant DIODE No. used

GAP change

D616 D615

4.0

2.0

3.0

5.0

Change of NOTCH GAP of Refrigerator (“WARMER” on the basis of “MEDIUM”)

Relevant DIODE No. used

GAP change

D620 D619

3.0

2.0

4.0

5.0

Notice

Although there are more OPTIONs except the above things described, they are not required on A/S with regard to the function of refrigerator regulation and so, not described here.

The above things are only the functions related with the temperature change actually used.

Control of water supply to ICE-MAKER (Change of SOLENOID opening time) use DIP S/W

		FTA / DTA	6 sec	5 sec	7 sec	8 sec	9 sec	12 sec	15 sec	23 sec
		S/W 1	OFF	ON	OFF	ON	OFF	ON	OFF	ON
		S/W 2	OFF	OFF	ON	ON	OFF	OFF	ON	ON
		S/W 3	OFF	OFF	OFF	OFF	ON	ON	ON	ON
32		The refrigerator is released with all S/W1 ~ S/W3 OFF (water supplying time is 7 seconds).

Temperature Change of Ice-Making SENSOR for Eject operation

Classification	-10	-11	-12	-13	-14	-9	-8	-7
D635	0	1	0	1	0	1	0	1
D636	0	0	1	1	0	0	1	1
D637	0	0	0	0	1	1	1	1

MODEL OPTION function

This refrigerator can operate 2 MODEL using one MAIN PCB Ass’y. So, since function of PANEL PCB and MAIN performance function are to be selected to change by MODEL OPTION of MAIN PCB, the same specification of PCB should be used on replacement of PCB or the following specification of MODEL OPTION and H/W OPTION should be applied. On change of MODEL OPTION, POWER should be OFF and ON for normal operation.

<Table for PCB specification>

MODEL	SET function	MODEL OPTION	H/W OPTION specification on PCB		Remark
		on PCB
		MO-1,	ICE MAKER OPTION part = not used
	H.M-CYCLE		C901 ~ C905(104)=JUMP WIRE used
SR-S25/26NTA		MO-2
	(Basic)		RY74, RY76 = not used
		Not used
			Water supply control DIP S/W = not used
			ICE MAKER OPTION part = used (refer
			to the following information)
	H.M-CYCLE		C901 ~ C907 = 104 AXIAL
			C/CAPACITOR used
	+
			R901 = 12	used
	ICE &
			R902,906,907,908 = 1.0 - J used
	WATER
SR-S24/25/27FTA		Only MO-2	R903,905 = 10 - J used
	DISPENSER
SR-S24/25/(DTA)		used	R904 = 10	- F used (deviation 1%)
	+		R909,910,911=4.7 - J used
	HOME BAR
			CN90=8P CONNECTOR SMW250-08
	(WITHOUT
			used
	HOMEBAR)
			Water supply control DIP S/W used
			D638, 639, 640 used (necessary on the used
			of DIP S/W)

Notice

When PCB should be replaced, check the specification described in the above TABLE and use the regular specification of PCB for normal operation. If possible, avoid remodeling because function resulted from the change of SPEC may occur.

Information

See the PCB circuit diagram of this manual.	33

8-10. PCB SUB Ass’y (INVERTER PCB)

1.EMI circuit

COMMON MODE NOISE is attenuated by CHOKE LFI, NORMAL MODE NOISE and D.C RESISTANCE.

2.Rectifier circuit

Holding voltage is converted to DC voltage by BRIDGE DIODE.

It is ELECTROLYTIC CAPACITOR and composed of balance circuit

3.First starter circuit

The current converted to DC by C2 is charged to C3 through R3. When more than 35V is charged at C3, the first switching operation is initiated by sending the current to BASE of Q2 through DAC R1 and D5 maintain enough potential difference between EMITTER and COLLECTOR of TRQ2 for easy first switching.

4.Switching circuit

Q2 becomes ON by the current from DAC and then, the current goes through C6C7C5 CH1

TR(CE). The current sent to PT1 is held at PT3 and by this holding current, Q2 maintains ON state. Switching circuit is consisted when OSC COIL becomes saturated by line current, counter-electromotive force

34	occurs at PT3, electromotive force is held at PT2, and then, Q1 comes to be operated.

5.Resonance output circuit

To make the life-span of fluorescent light bulb longer, supply the filament pre-heat current. Line current is running through filament C6 RT1 filament C5 PT1. Resistance value is increased at PT1 by running of PTC pre-heat current.

When impedance of PT1 is Higher than impedance of C7, the current runs toward C7 and so, discharge voltage is permitted to both ends of lamp. And finally, discharge occurs at lamp as a result of resonance of L and C. After LAMP is ON, the resonance current runs through lamp RT2 C5 PT1.

6.Guard circuit

On abnormal operation of LAMP or abnormal operation of switching circuit, toward D7, more than 0.7 V of voltage is held at GATE of SCR and so, SCR operates to block power.

When abnormal voltage or over-voltage is held at power part, FUSE at the primary power circuit is gone to block the power.

35

9. Inverter Component list

		NO	Items	Specification			EA	Remark
		1	RESISTOR	2W 5% 150 kohm			1	R1
		2	RESISTOR	1W 5% 120 ohm			1	R2
		3	RESISTOR	1W 5% 560 kohm			2	R3, R4
		4	RESISTOR	1/4W 5% 12 kohm			1	R5, R6
		5	RESISTOR	1/4W 1% 2.35 ohm			2	R7, R8
		6	RESISTOR	1/4W 5% 10 ohm			1	R9
		7	RESISTOR	1/4W 5% 8.2 kohm			1	R10
		8	ELECT CAPACITOR	450V 10			1	C2
		9	ELECT CAPACITOR	6.3V 220			2	C8
		10	PE CAPCITOR	275VAC 0.1		(104)	1	C1
		11	MYLAR CAPACITOR	100V 47	(2J 473K)		1	C3
		12	NPP CAPACITOR	630V 1.0	(2J 102K)		1	C4
		13	MF CAPACITOR	630V 47	(2J 473K)		1	C5
		14	NPP CAPACITOR	630V 8.2	(2J 822K)		1	C6
		15	NPP CAPACITOR	630V 3.3	(2J 332K)		1	C7
		16	GP DIODE	1N4007			7	D1, D2, D3, D4, D5, D6, D7
		17	FASRECOVERY DIODE	1N4937, FR105			2	D8, D9
		18	DIAC	N413, NMA64, D30A			1	DAC
		19	CHOKE COIL	CORE : EE 1916			1	CH1
				COIL :	0.3
				L VALUE : 2.6		0.3mH
		20	OSC COIL	CORE : AMS-08S-N			1	PT1
				TURN : 6:4:4
				COIL :	0.3
				L VALUE : 50uH OVER
		21	NOISE FILTER COIL	CORE : UU1116			1	LF1
				COIL :	0.23
				L VALUE : 50mH OVER
		22	FUSE	250V 2.0A			1	FUSE
				(MEDIUM NORMA-TYPE)
		23	TRANSISTOR	BUH51			2	Q1, Q2
		24	SCR	S1M			1	Q3
		25	PTC CERA MITE	307C1414BHMAB			1	RT1
		26	PCB	86 50			1
		27	WIRE HARNESS	PLUR HOUSING : 35151-0410				“A”part
				TERMINAL : 35745, 746, 747			1	(HOUSING
					748-0110		couple	connecting part)
				T.P.A : LOCK 35150-0292
				WIRE :
				COLOR : BLACK 2, WHITE 2
				SIZE : UL1007 AWG20
				LENGTH : 85MM
				CRIMP HOUSING : BH0640-07				“B”part (PCB outlet)
				CRIMP TERMINAL : BT0604
		28	WAFER	YW396-03AV			1	INPUT
		29	JUMP WIRE	0.6 10MM			2	J1, J2
		30	VARISTOR	ANR471D14			1	TNR
36
		31	PE CAPACITOR	630V 10nF(2J103K)			1	C9