SAMSUNG RT44MBSW Service Manual

Model :RT40MA / MB

RT44MA / MB

		REFRIGERATOR						CONTENTS

1. Product Specifications

2. Safety Warnings

3. Specifications of Electric

4. Electric Circuit Diagram

5. External Size and Designations

6. Refrigeration Cycle and Cool

7. Circuit Operation Theory

8. Troubleshooting

9. Exploded View and Part List

10. Disassembly of Freezing

11. Disassembly of Refrigerating

1. Product Specifications

[CFC-FREE]
			ITEM	SPECIFICATION
		Model name		RT40MA/MB		RT44MA/MB
	Vailable		Freezer	87(3.1)		87(3.1)
			Refrigerator	260(9.2)		282(10.0)
Capacity(cu.ft)
			Total	347(12.3)		369(13.1)
		Net Dimension		670x640x1660		670x640x1730
	(WidthxDepthxHeight)			(670)		(670)
	Rated Voltage & frequency			110~115V/60Hz, 127V/60Hz, 220V/5~60Hz, 230~240V/50
	Rated Power Defrost, Heater			290W/310W
	Type of Refrigerator			forced convection
		Refrigerant		HFC-134a
	Refrigerant Mass			150g
	Freezing Capicity			4 STAR
	Weight (Net/Gross)			59/69(kg)		63/73(kg)

1

2. Safety warnings

Read all instructions before using this appliance in order to avoid risk of accident or possible damage.

Warning/Caution

This symbol is intended to Warning alert the user to the

possible death or injury.

This symbol is intended to Caution alert the user to the

possible injury or damage.

Description of symbols

Indicates prohibition

Do not disassemble

Do not contact

Follow Adhere the instruction strictly

Unplug from the electrical outlet

Earth the appliance to avoid the risk of an electric shock

Warning

Do not plug multiple electrical	Do not attempt to make repairs	Make sure the power cord is not
appliances into the same outlet.	yourself.	crushed or damaged.
• This may cause abnormal	• This could lead to fire hazard or	• Repair immediately all power cords
heating or a fire hazard.	abnormal operation causing	or outlets that have become frayed
	severe personal injury.	or otherwise damaged.

Prohibition

Do not disassemble

Check the operating environment.	Be sure the earth.						Pull the power plug out for
• Do not install the refrigerator in a	• If earthing is not done, it will						exchanging electrical equipment.
humid (with condensation) location	cause breakdown & electric						• It may cause electric shock.
or on an unstable surface.	shock.

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	small multi-purpose room.	etc, in the refrigerator.
may inflict a wound.	• It may hurt you when refrigerator	• The products which cotrolled by
	door is opened and closed	temperature shall not be stored
	resulting in falling stuff down.	in the refrigerator.

Prohibition

Prohibition

Prohibition

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

Rated

components

Prohibition

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

•Cleaning may prevent the possible fire by tracking or short

After repair, check the assembled state of components.

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

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

•If there is that kind of trace, change related components or do the necessary treatment such as taping using the insulating tape.

3

3. Specifications of Electric Components

[CFC-FREE]

			ITEM	SPECIFICATION
		Model name		RT40MA/MB		RT44MA/MB
			Type	2-Door Freezer/Refrigerator
	Power Source			AC110~115V/60Hz, 127V/60Hz
				220V/50~60Hz, 230~240V/50Hz
	Net Capacity		Freezer	87		87
			Refrigerator	260		282
	(ℓ/cu.ft)
			Total	347/12.3		369/13.1
Net Dimension			Width		670
			Depth(MA)		640(670)
	(mm)
			Height	1660		1730
	Net weight (Kg)			59		63
		Refrigerant			R134a (150g)
	Temperature Control			Dial (Resistance)
		Defrosting		Automatic (Start-Finish by PCB)
	Foam		Cabinet	Cyclo-Pentane
	insulation		Door	Cyclo-Pentane
	Liner/Door Panel			ABS (SD-0150)
				2 Guard-Freezer
			Door	1 Guard-Egg,1 Guard-Bottle
			Storage	2	Guard-Variety
				1 Guard-Jumbo
				1 Base Tray Ice
				1 Case Tray Ice
				1 Shelf Freezer
	Accessory		Inside	1 Vegetable Partition
	Parts		Storage	1 Case Chilled Room
				2 Shelf Refrigerator
				1 Cover Vegetable
				1 Case Vegetable
			Interior Lamp	Refrigerator (Freezer)
			Movable Caster		2 (Rear)
			Angle Adjustment		2 Legs (front)

4

[CFC-FREE]

	ITEM				STANDARD(MECHANICAL TYPE)
	Model						RT40/44MA/MB
	Power source				110~115V/60Hz		127V/60Hz				220V/50~60Hz
Cycle				Model	UK162C-L1U/T3		UK162P-L1U/T3				SK182H-L2U/E02
	Compressor			Starting type			R.S.C.R
Refrigeration				Oil charge	FREOL α–15c / 200cc
	Evaporator						Fin type
	Condenser				Natural convection type
	Dryer				Molecular sieve (XH-9, 13g)
	Capillary tube				ID 0.75 x L3400 (mm)
	Thermostat			Refrigerator	PFN-174S-05F (ON:5.5˚C±1.5˚C OFF:+3.0˚C±1.5˚C)
				Bimetal	Rating Voltage/Ampere						AC 250V / 5A
	Defrost-thermo			(OFF/ON)	Open temperature				ON:-5±3˚C/OFF:12±3˚C
				Thermal fuse	Rating Voltage/Ampere					AC 250V / 10A
					Open temperature						77±10˚C
				Type	TMDE714F1						TD-20CSA
	Defrost-timer
Electrical				Defrosting	6hr 40min(60Hz)/8hr(50Hz)
				Resistance	10Ω-2PIN			12Min			22Ω-2PIN
				Interval
	PTC-relay			Model	J531Q33E100M 200-2				J531Q34E220M350-2
	Overload			Model	4TM419						4TM308
					NHBYY-53						PHBYY-53
	protector
				Close temp.	69±9˚C						69±9˚C
				Open temp.	120±5˚C						125±5˚C
	Capacitor			Running	250VAC/12µF					350VAC/5.0µF
							MORS 1.2W
	Resistor Heater
	Heater-defrost				290W/45Ω						290W/167Ω
	Lamp						220V~240V/15W
	Door-Switch				250V/0.5A, 125V/1.5A
	Earth screw						BSBN(Brass screw)

5

[CFC-FREE]

		ITEM			STANDARD(SEMI ELECTRIC TYPE)
		Model			RT40/44MA/MB
		Power source			220V/50Hz		230~240V/50Hz
	Cycle			Model	MK172QL1U/E01
		Compressor		Starting type	R.S.C.R
	Refrigeration			Oil charge	FREOL α–15c / 200cc
		Evaporator			Fin type
		Condenser			Natural convection type
		Dryer			Molecular sieve (XH-9, 13g)
		Capillary tube			ID 0.75 x L3400 (mm)
		Sensor			502AT
				Sensor	Rating Voltage/Ampere		DC 5V
		Defrost-sensor			Open temperature		ON:-5˚C±3˚C/OFF:+15˚C
				Thermal fuse	Rating Voltage/Ampere		AC 250V / 10A
					Open temperature		77˚C±10˚C
		PTC-relay		Model	J531Q35E330M385-2
	Electrical			Resistance	33Ω-2PIN
		Overload		Model	4TM232SHBYY-53
		protector		Close temp.	69±9˚C
				Open temp.	135±5˚C
		Capacitor		Running	350VAC/5.0µF
		Heater-defrost			290W/167Ω		310W/170Ω
		Lamp			220V~240V/15W
		Door-Switch			250V/0.5A, 125V/1.5A
		Earth screw			BSBN(Brass screw)

6

4. Electric Circuit Diagram

● Semi Electric Control Type

[220V/50Hz, 230~240V/50Hz]-RT40/44

			“A-2"	M		E
			N
			E			C
			L	S
						COMPRESSOR
						"B-2"
	MAIN PCB		“A-1" “B-1" : WITHOUT EARTH
			“A-2" “B-2" : WITH EARTH
		CN01	“C" : WITH F/LAMP
							RED	“A-1"
SUB PCB		RED						N
								L
	CN02	WHT	R/LAMP			DOOR SWITCH
							RED
	BRN		GRY	L				GRY
CN01						WHT 2	1
	BRN		“C"
					F/LAMP
				L
					WHT/BLK
				M		PINK 3
	GRY
			FAN MOTOR
	GRY GRY
R ROOM-SENSOR			DEFROST HEATER THERMAL FUSE
	WHT BRN
EXT-SENSOR			PINK			WHT	RED
	WHT
EVAP-SENSOR	YEL		SK/BLU
	YEL					C
			2	5
							RED
	SK/BLU		PINK 3	6		S COMPRESSOR	OVERLOAD
			RUNNING P.T.C RELAY				PROTECTOR
			CAPACITOR

GRY-GRAY

RED-RED

BRN-BROWN

YEL-YELLOW

WHT/BLK-WHITE/BLACK

PINK-PINK

WHT-WHITE

SK/BLU-SKY BLUE

E-EARTH

7

● Mechanical Type

[110~115V/ 60Hz, 127V/60Hz, 220V/50~60Hz]-RT40/44

			“A-2"				A	M	E
				E
							N		C
								S
									COMPRESSOR
								“B-2"
						“A-1"“B-1" : WITHOUT EARTH
						“A-2"“B-2" : WITH EARTH
			L		C					L
	YEL			H					GRY
										“A-1"
			BRN R-THERMP
										N
							R/LAMP		L
					R-HEATER				W/BLK	RED RED
3 M 1 WHT							RED
					WHT			PNK		RED
4	BRN		WHT
	2	BIMETAL				DEFROST		THERMAL
										RED
DEFROST						HEATER		FUSE
TIMER
S/BLU			FAN MOTOR					PNK
					F.M
S/BLU			COMP. COOLING MOTOR						DOOR-S/W
										RED
					C.M
S/BLU						M		“B-1"		RED
			2	5			C
S/BLU		PNK 3		6		S			OVERLOAD
							COMPRESSOR
									PROTECTOR

RUNNING P.T.C RELAY

CAPACITOR

GRYGRAY

REDRED

BRNBROWN

YELYELLOW

S/BLUSKY BLUE

PNKPINK

BLKBLACK

WHTWHITE

W/BLKWHITE/BLACK

8

5. Extemal size and Designations

5-1) Product Dimension

1250.5

454.1

670

	D
80.5	C
	15
548.5

A 9

B

60 50

	MODEL	A	B	C	D	Remark
	RT40MA/MB	1660	1103.5	549.5	640(670)	( )BAR TYPE
	RT44MA/MB	1730	1173.5	549.5	640(670)

9

5-2) Identifying and disassembling the parts

To remove shelves in the freezing compartment

• Frist remove the icemaking molds. Tilt the shell up at front, then lift it up and pull it out of the tracks.

To remove shelves in the Disassemble chilled compartment

	• Lift up the cover, push the
	cover to the right (as shown)
	until the mounting hook( )
	disengages, then disengage
	the other mounting hook ( )
	and pull out the cover.
	• Pull the shelf forward until it
	stops. then lift it up and pull
	it out.
	• With shelf front raised	Reassemble
	slightly, engage, the roller

between the rails and slide it back.

• To repace the cover, first engage the mounting hook ( ) as shown, then engage the other hook ( ) and push in.

To remove bio deodorizer

•While pushing the front end knob of the bio deodorizer, pull it downward to disengage.

To remove shelves in the refrigerating compartment

•Hold the shelf by the front and pull it forward of the rack.

To remove door bins

•While pushing the bin to the left, lift it up to disengage.

To remove storage drawers and covers

•Lift up to remove the cover. Pull the drawer helf way out, then lifting it up, pull it out completely.

10

6. Schematic diagram of coolant gas circulation

6-1) Refrigeration Cycle

COMPRESSOR → PIPE IMMERGE → PIPE SUB CONDENSER → PIPE CLUSTER → PIPE HOT → DRYER→ CAPILLARY TUBE → EVAPORATOR → ACCUMULATOR → PIPE SUCTION → COMPRESSOR

11

6-2) Cool Air Circulation

•Cold air generated from the cooling system is distributed to the freezing compartment and the refrigerating compartment by the air circulation fan.

•In the freezing compartment, cold air is distributed to the compartment as well as to the shelves from the cold air exhaust port, food is frozen in the freezing compartment by cold air shower.

•Cold air that comes out of the freezing compartment is absorbed back to the lower part of the cooling system through the suction port on the median divider.

•In the refrigerating compartment, cold air is distributed to the duct cover through the median divider. Cold air supplied to the duct cover passes through the refrigerating compartment.

•After cooling the refrigerating compartment, cold air is absorbed to the lower part of the cooling system through the suction port on the median divider.

Rotating blade

12

7.Circuit operation theory

1.Temperature Control and Operational Description of Other Functions

1.Temperature Control Part Design

Freezer Temperature Controller

Refrigerator Temperature Controller

2. Temperature Control Function

1)Selecting Freezer Temperature

l Selecting“Quick cooling~Quick freezing”is possible with turning temperature control knob. l Controlled temperature of each temperature control knob position is as follows:

	Knob Position	Quick cooling	Normal	Quick Freezing	Winter
	Controlled	-15±1	-19.0	-21±1	-23±1
	Temperature

2)Selecting Refrigerator Temperature

l Selecting ~ is possible with turning temperature control knob.

l Controled temperature of each temperature control knob position is as follows:

	Knob Position
	Controlled	6.0	4.5	3.0	2.0	1.0	0.0	-1.0
	Temperature

Caution) As this controller is by the ROTARY S/W, in case it is off the position, it is set to step 4 automatically.

3. Defrosting Function

1)Defrosting is decided by the accumulated time of comp on. 2)Defrosting proceeds in order of heating → recess time.

3)The first defrosting function after the initial power on starts with 4 hours of accumulated time of comp on, and then it repeats its function at every 8th hour of comp on.

4)In the process, controlling of defrosting heater ON/OFF is done by EVA-SENSOR. When the quality of EVA-SENSOR is poor (short/open) defrosting will be terminated only after recess time function without heating.

5)In the process, comp and fan maintain ON condition, after defrosting heating it operates with 10 min. recess time.

6)defrosting heating point ON and OFF operates by EVA-SENSOR and each temperature is as follows:

Heater On Point	Heater Off Point	Remark
below -5	15

13

4. Testing Function

l This function is for PCB and test of products, work process test, and SVC.

lAfter checking the product's function by selecting TEST S/W, let the self-diagnosis function start with the POWER OFF and ON.

1)Forced Starting Function

lCOMP and FAN starts immediately after the TEST S/W on the Main PCB is pressed once. So when the forced staring function is done right at the COMP OFF point, Over Load in the COMP may be caused. Extra caution is necessary.

lWhen forced starting function is selected, COMP and FAN run for 24 hours regardless of the freezer/refrigerator temperature and knob selection. Indicating Lamp on main PCB shows that it is a forced starting function by 0.5sec interval ON/OFF.

lWhen a selected forced starting function is selected and maintains for 24 hours, defrosting function starts its operation, and when defrosting is completed normal operation is carried out according to the temperature selection knob position.

lTo release it's operation during forced starting, power should be turned off and turned on again or test release mode on 3) below should be selected.

2)Forced Defrosting Function

l If test switch is pressed once more during forced starting function, it is released immediately and forced defrosting function starts, and the Lamp on main PCB shows that it's forced defrosting by 1.0 sec. interval ON/OFF.

lWhen forced defrosting is selected COMP and FAN is turned off immediately, and defrosting heater is turned on at the same time. At this moment if the sensed temperature of EVA-

SENSOR is higher than -5.0 , defrosting heater is not turned ON and operates only for recess time and returns to normal operation.

lWhen Heating is completed it recesses for 10 mints. and after that indicating Lamp remains ON and returns to normal operation.

3)Test Function Release Mode

If TEST S/W is pressed once more when forced defrosting function is carried out, forced defrosting is released and stops for 10 mints. and after that it returns to normal operation.

14