Samsung RT40MA Service Manual
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Samsung RT40MA Service Manual

Samsung RT40MA Service Manual

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REFRIGERATOR
Model :RT40MA / MB
RT44MA / MB
CONTENTS
5. External Size and Designations
6. Refrigeration Cycle and Cool Air Circulation
9. Exploded View and Part List
10. Disassembly of Freezing Compartment
11. Disassembly of Refrigerating Compartment

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Summary of Contents for Samsung RT40MA

  • Page 1 Model :RT40MA / MB RT44MA / MB REFRIGERATOR CONTENTS 1. Product Specifications 2. Safety Warnings 3. Specifications of Electric Components 4. Electric Circuit Diagram 5. External Size and Designations 6. Refrigeration Cycle and Cool Air Circulation 7. Circuit Operation Theory 8.
  • Page 2 1. Product Specifications [CFC-FREE] ITEM SPECIFICATION Model name RT44MA/MB RT40MA/MB Freezer 87(3.1) 87(3.1) Vailable Refrigerator 260(9.2) 282(10.0) Capacity(cu.ft) Total 347(12.3) 369(13.1) 670x640x1660 670x640x1730 Net Dimension (670) (670) (WidthxDepthxHeight) 110~115V/60Hz, 127V/60Hz, 220V/5~60Hz, 230~240V/50 Rated Voltage & frequency 290W/310W Rated Power Defrost, Heater...
  • Page 3 2. Safety warnings Read all instructions before using this appliance in order to avoid risk of accident or possible damage. Warning/Caution Description of symbols Indicates prohibition This symbol is intended to Warning alert the user to the Do not disassemble possible death or injury.
  • Page 4 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.
  • Page 5 3. Specifications of Electric Components [CFC-FREE] ITEM SPECIFICATION Model name RT40MA/MB RT44MA/MB Type 2-Door Freezer/Refrigerator AC110~115V/60Hz, 127V/60Hz Power Source 220V/50~60Hz, 230~240V/50Hz Freezer Net Capacity Refrigerator (ℓ ℓ /cu.ft) 347/12.3 369/13.1 Total Width Net Dimension 640(670) Depth(MA) (mm) 1660 1730 Height...
  • Page 6 [CFC-FREE] ITEM STANDARD(MECHANICAL TYPE) Model RT40/44MA/MB Power source 110~115V/60Hz 127V/60Hz 220V/50~60Hz Model UK162C-L1U/T3 UK162P-L1U/T3 SK182H-L2U/E02 Compressor Starting type R.S.C.R 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...
  • Page 7 [CFC-FREE] ITEM STANDARD(SEMI ELECTRIC TYPE) Model RT40/44MA/MB Power source 220V/50Hz 230~240V/50Hz Model MK172QL1U/E01 Compressor Starting type R.S.C.R 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 Rating Voltage/Ampere...
  • Page 8 4. Electric Circuit Diagram Semi Electric Control Type ● [220V/50Hz, 230~240V/50Hz]-RT40/44 “A-2" COMPRESSOR "B-2" “A-1" “B-1" : WITHOUT EARTH MAIN PCB “A-2" “B-2" : WITH EARTH “C" : WITH F/LAMP CN01 “A-1" SUB PCB DOOR SWITCH CN02 R/LAMP CN01 “C" F/LAMP WHT/BLK PINK 3...
  • Page 9 Mechanical Type ● [110~115V/ 60Hz, 127V/60Hz, 220V/50~60Hz]-RT40/44 “A-2" COMPRESSOR “B-2" “A-1" “B-1" : WITHOUT EARTH “A-2" “B-2" : WITH EARTH “A-1" BRN R-THERMP R/LAMP R-HEATER W/BLK BIMETAL DEFROST THERMAL DEFROST HEATER FUSE TIMER FAN MOTOR S/BLU F. M DOOR-S/W COMP. COOLING MOTOR S/BLU C.
  • Page 10 5. Extemal size and Designations 5-1) Product Dimension 454.1 80.5 MODEL Remark RT40MA/MB 1660 1103.5 549.5 640(670) ( )BAR TYPE RT44MA/MB 1730 1173.5 549.5 640(670)
  • Page 11 5-2) Identifying and disassembling the parts To remove bio deodorizer • While pushing the front end knob of the bio deodorizer, To remove shelves in the pull it downward to disengage. freezing compartment • Frist remove the icemaking molds. Tilt the shell up at front, then lift it up and pull it out of the tracks.
  • Page 12 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...
  • Page 13 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.
  • Page 14 7. Circuit operation theory 1. Temperature Control and Operational Description of Other Functions 1. Temperature Control Part Design Refrigerator Temperature Controller Freezer Temperature Controller 2. Temperature Control Function 1)Selecting Freezer Temperature Selecting “Quick cooling~Quick freezing”is possible with turning temperature control knob. Controlled temperature of each temperature control knob position is as follows: Quick cooling Normal...
  • Page 15 4. Testing Function This function is for PCB and test of products, work process test, and SVC. After 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 COMP and FAN starts immediately after the TEST S/W on the Main PCB is pressed once.
  • Page 16 5. Self-diagnosis Function 1)If the power is supplied to refrigerator, self-diagnosis function is carried out for 2 seconds internally. 2)If there is no defect after self-diagnosis is carried out, it returns to normal operation. 3)If there is defect after self-diagnosis is carried out, defected area is indicated with the corresponding display on the Table below by indicating Lamp on PCB, it does not start until all defects are completely repaired.
  • Page 17 2. Operational Principle of Each Circuit 1. Power Circuit Voltage Applied circuit V12(DC 12V) RELAY operation Vcc(DC 5V) Power around micom and detection part of sensor The decompressed AC voltage on the DC-TRANS secondary outputs around AC 16V to the both sides of the ‘a’...
  • Page 18 3. Reset Circuit The reset circuit makes all program functions operate at the initial stage by initializes the various parts such as RAM in MICOM when the power is supplied or the power is supplied to the MICOM power by a power failure in a moment. When the power is supplied, the voltage of reset becomes low during scores of uSEC, and it maintains high during the normal operation.
  • Page 19 5. Temperature Sensor Circuit 1) As the sensor uses a thermistor, its resistance gets smaller when the temperature is high, and it gets bigger when the temperature is low. 2) The voltage which is input to MICOM by a sensor is calculated with Vf=(Rth× Vcc)/(R303+Rth).
  • Page 20 6. Temperature Controller (Rotary S/W) Circuit ❈ Caution: Number ① ~ ⑩ in ROTARY S/W Circuit shows S/W contact number. Temperature controlling is carried out by changing ROTARY S/W KNOB assembled inside the refrigerator from level 1 to level 8. The voltage of temperature controlling SETTING is divided by combined resistance of DC5V resistance R503 and resistance value of ROTARY S/W(this is a combined parallel resistance of R908 and resistance value of ROTARY S/W position) and resistance R502.
  • Page 21 7. Load Operation and Indicating Lamp Controlling Parts a) When the COMP is turned on, the micom (pin 24) outputs high (DC 5V) and a realy is activated. When the COMP is turned off, the micom (pin 24) outputs low (0V) b) The defrosting heater is turned on, the micom (pin 23) outputs high (DC 5V) and a realy is activated.
  • Page 22 8. Various OPTION function MICOM OUTPUT1 OUTPUT2 OUTPUT3 OUTPUT4 OUTPUT5 D601 D605 D609 D613 D617 INPUT1 D602 D606 D6010 D614 D618 INPUT2 D603 D607 D611 D615 D619 INPUT3 D604 D608 D612 D616 D620 INPUT4 8-1. TABLE OF TEMPERATURE CHANGE OF REFRIGERATOR(● ● :RELEVANT DIODE NO. USED) (℃) SHIFT SHIFT...
  • Page 23 3. Detecting Defects and Trouble Shooting 1. When refrigerator temperature is too high or too low: Start-Up -Is the NOTCH of refrigerator temperature controller OK? Control temperature controller. Is the S/W contact of refrigerator temperature controller OK? Replace temperature controller. Voltages and Resistance values of each ROTARY S/W on CN01 of MAIN PCB OK?
  • Page 24 2. Checking Abnormalities of MAIN PCB ASS'Y Start-Up Is power input between PIN1 and PIN5 on CN01 of MAIN PCB discharged? Repair Power Cord and wires. Is FUSE of MAIN PCB OK? Replace Fuse. Is soldering and SHORT on the soldered area of MAIN PCB OK? Check soldering.
  • Page 25 4. Circuit...
  • Page 26 5. VSB Relay SAFETY STANDARD & FILE NUMBERS Nominal Relay type contact ratings coil Voltage UL 508 (File No. E56140. E108658) C22.2 No.0, No.14 (File No. LR35579)) 1/3HP 125VAC/250VAC VDE 0435, 0631, 0700 3 to 100VDC 30VDC/250VAC, Resistive Please be noted that UL/CSA rating may differ from the Standard ratings.
  • Page 27 16 Amps. Miniature Slim Type Power Relay FEATURES All or Nothing Relay UL, CSA, VDE, SEV, SEMKO, IMQ, ÖVE, BSI Recognized Working Class : C Type of Service : Continuous Duty Heavy Duty 16A Miniature Power Relay UL Class B(130℃) Insulation STRUCTURE High Isolation in Small Package -Insulation Distance : 8mm...
  • Page 28 =25℃ ℃ ) ABSOLUTE MAXIMUM RATING (T Characteristic Symbol Value Unit Supply Voltage -0.3 ~ +15.0 Detecting Voltage Hysteresis Voltage Operating Temperature -30 ~ +75 ℃ Storage Temperature -50 ~ +150 ℃ Power Dissipation Detecting Voltage Temperature Coefficient ±0.01 %/℃ =25℃...
  • Page 29 3-3V VOLTAGE DETECTOR TO-92 The KA7533 prevents error of system from supply voltage below normal voltage level at the time power on and instantane ous power off in systems. FEATURES Detecting against error operations at the power ON/OFF Resetting function for the low voltage 1:Input 2:GND 3:Output...
  • Page 30 ELECTRICAL CHARACTERISTICS KA7812/I (Refer to test circuit, T <T <T =500mA, V =19V, C =0.33㎌, C =0.1㎌, unless otherwise specified) MAX, KA7812I KA7812I Characteristic Symbol Test Conditions Unit Min Typ Max Min Typ Max = 25℃ 11.5 12.5 11.5 12.5 5.0mA ≤...
  • Page 31 ABSOLUTE MAXIMUM RATINGS = 25℃ unless otherwise specified) Characteristic Symbol Value Unit Input Voltage (for V = 5V to 18V) (for V = 24V) Thermal Resistance Junction - Cases ℃/W Thermal Resistance Junction - Air ℃/W Operating Junction Temperature Range KA78XX/A 0 ~ +125 ℃...
  • Page 32 6. Circuit related Parts List REGULATOR TO-220 3-TERMINAL 1A POSITIVE VOLTAGE REGURATORS The KA78XX series of three-terminal positive regulators are available in the TO-220 package and with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shut- down and safe area protection, making it essentially indestructible.
  • Page 33 7. Reference) Resistance and voltage conversion table of sensor for temperature The input voltage of MICOM port can be different according to the composition of H/W and its specification is standardized using a 10㏀-F grade. The voltage specification of relevant MICOM when the sensor is open : Around DC 5V (Vcc level) The voltage specification of relevant MICOM when the sensor short circuits : Around DC 0V (Ground level) Temperature Voltage(v)
  • Page 34 Temperature Voltage(v) Temperature Voltage(v) Resistance (㏀) Resistance (㏀) 25.040 3.573 5.970 1.869 23.906 3.525 5.759 1.827 22.832 3.477 5.557 1.786 21.814 3.428 5.363 1.745 20.848 3.397 5.178 1.705 19.932 3.329 5.000 1.666 19.062 3.279 4.829 1.628 18.237 3.229 4.665 1.590 17.453 3.178 4.508...
  • Page 35 8. Specification of Main Part DRIVER IC(KA2657) DRIVER : MC1413BCP(KA-2657) KA2655/6/7/8/9 LINEAR INTEGRATED CIRCUIT ■ELECTRICAL CHARACTERISTICS (Ta = 25℃, unless otherwise noted) Characteristic Symbol Test Min Trp Max Unit DC Current Gain = 2.0V, I = 350mA(KA2655) 1000 Input Capacitance 0.5 V 0.5 V 0.25...
  • Page 36 9. Specification of Main Circuit Part MAIN PCB "A-2" CN01 "A-1" SUB PCB CN02 DOOR SWITCH R/LAMP CN01 F/LAMP "C" WHT/BLK COMPRESSOR PINK "B-2" FAN MOTOR R ROOM-SENSOR DEFROST HEATER THERMAL FUSE EXT-SENSOR PINK "A-1" "B-1" : WITHOUT EARTH "A-2" "B-2" : WITH EARTH SK/BLUE "C"...
  • Page 37 8. Troubleshooting 8-1 Trouble check for the cooling cycle...
  • Page 38 8-2 Diagnosing the main components Components Diagnosing methods and criteria Location • Use the tester to measure Normal Abnormal Measuring point Mechanical the resistance. Compressor Approx 10 ~ 500kΩ 0Ω and Primary iwre compartment – Bring the component to cool down ∞Ω...
  • Page 39 9. Exploded View & Parts List 9-1 Freezing compartment SHELF-FRE ASSY FIXER-GROMMET-D/FRE SHELF-FRE TRIM-SHELF SUPT-TRAY ICE CASE-ICE CUBE SPRING-ICE TRAY-ICE CASE-TRAY ICE SHELF-FRE ASSY TRAY-ICE SHELF-FRE CASE-TRAY ICE ASSY TRIM-SHELF GROMMET-MOTOR MOTOR-FAN GROMMET-MOTOR CASE MOTOR FAN-PROPELLER SUPPORT-MOTOR COVER-MOTOR SPRING-FAN ASSY COVER EVAP LEVER AIR CONTROL WASHER INS EVAP REAR...
  • Page 40 9-2 Refrigerating compartment(Mechanical Type) SHELF-REF SHELF-REF ASSY SHELF-REF ASSY RAIL-CHILLED, L GROMMET-RAIL RAIL-CHILLED, R TRIM-SHELF REF GROMMET-RAIL KNOB-MOIS CONT SHELF-REF SHELF-REF LOW ASSY SHELF-REF LOW TRIM-SHELF REF GROMMET-RAIL SHELF-WIRE REF ASSY SHELF-WIRE REF TRIM-SHELF CASE-VEG CASE-CHILLDE ROOM CATALYST-LTC RAIL-LOW(L) SEAL-DUCT REAR COVER-PURIFIER TRAY-CHILLED ROOM GROMMET-COVER CHIL, B...
  • Page 41 9-3 Refrigerating compartment(Semi Electric Type) SHELF-REF SHELF-REF ASSY SHELF-REF ASSY RAIL-CHILLED, L GROMMET-RAIL RAIL-CHILLED, R TRIM-SHELF REF GROMMET-RAIL KNOB-MOIS CONT SHELF-REF SHELF-REF LOW ASSY SHELF-REF LOW TRIM-SHELF REF GROMMET-RAIL SHELF-WIRE REF ASSY SHELF-WIRE REF TRIM-SHELF CASE-VEG CASE-CHILLDE ROOM CATALYST-LTC RAIL-LOW(L) COVER-PURIFIER TRAY-CHILLED ROOM GROMMET-COVER CHIL, B...
  • Page 42 9-4 Door parts RT40/44MA HANDLE-TRIM FRE ASSY-FOAM DOOR FRE CAP-H/D FRE BASE-H/D PRE GUARD-FRE UPP STOPPER-DOOR HANDLE-TRIM REF SCREW-MACHINE HANDLE-REF GUARD-FRE LOW ASSY-FOAM DOOR REF CAP-H/D REF GUARD-EGG GROMMET-DOOR STOPPER-DOOR SCREW-MACHINE RT40/44MB ASSY-FOAM DOOR FRE GUARD-VARIETY GUIDE-FRE LOW ASSY-FOAM DOOR REF GUARD-BOTTLE...
  • Page 43 9-5 Cabinet Parts & Unit(Semi electric Type) COVER-CASE JUNCTION COVER-HING UPP C-OIL HINGE UPP HINGE UPPER ASSY SHIM HINGE UPP CASE-JUNCTION PBA MAIN POWER CORD TRAY-DRAIN WATER CAP SCREW COMPRESSOR SWITCH-DOOR WASHER PLAIN HINGE-MID ASSY PROTECTOR-O/L GROMMET-COMP RELAY-PTC COVER-RELAY HINGE-MID SHIM-HINGE MID COVER COOL, L COVER COOL, R...
  • Page 44 9-6 Cabinet Parts & Unit(Mechanical Type) COVER-CASE JUNCTION COVER-HING UPP C-OIL HINGE UPP HINGE UPPER ASSY SHIM HINGE UPP CASE-JUNCTION TIMER MOTOR POWER CORD FAN PROFELLER FAN SPRING TRAY-DRAIN WATER CAP SCREW SUPPORT-MOTOR COMPRESSOR SWITCH-DOOR WASHER PLAIN HINGE-MID ASSY PROTECTOR-O/L GROMMET-COMP RELAY-PTC COVER-RELAY...
  • Page 45 10. How to Disassemble of freezing Compartment 10-1 COVER-EVAP ASS’Y 1. Take out food & useless in the freezer room and get rid of the moisture in the freezer. 2. Please pull up the top with a long-nose and insert the hand into the gab, as shown below.
  • Page 46 11. How to disassemble of refrigerating Compartment 11-1 Changing the Light Bulb When you open the refrigerator door, a light comes on the help you find what you are looking for more easily. If you need to replace the bulb, proceed as follows. Remove the chiller compartment by: ◆...
  • Page 47 ELECTRONICS 272,Oseon-Dong,Kwangsan-Gu, Kwangju-City,Korea,506-253 TEL:(062)950-6811,6812 FAX:(062)950-6829 ⓒSamsung Electronics Co,Ltd Refrigerator Division 2003.04 Printed in Korea DA82-00004A...

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