LG LSC27931SB Service Manual
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LG LSC27931SB Service Manual

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See also: Owner's Manual
REFRIGERATOR
SERVICE MANUAL
CAUTION
PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS MANUAL
BEFORE CHECKING OR OPERATING THE REFRIGERATOR.
PUSH
MODELS:
LSC27931SB
/05
LSC27931ST
/03
LSC27931SW
/04

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Summary of Contents for LG LSC27931SB

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS MANUAL BEFORE CHECKING OR OPERATING THE REFRIGERATOR. MODELS: LSC27931SB PUSH LSC27931ST LSC27931SW...
  • Page 2 ECN (Engineering Change Number) Rev.01 Improve energy consumption • Evaporator Assembly • Fan Assembly • Shroud Assembly,Freezer • Grille Assembly,Fan • Controller Assembly • Bracket,Motor • Heater,Sheath • PCB Assembly,Main Rev.02 (STS model) / Rev.03 (SW model) / Rev.04 (SB model) New Dispenser •...

  • Page 3: Table Of Contents

    CONTENTS WARNINGS AND SAFETY PRECAUTIONS ................1. SPECIFICATIONS ....................... 2. PARTS IDENTIFICATION ....................3. HOW TO INSTALL REFRIGERATOR ................. 4. HOW TO DISASSEMBLE AND ASSEMBLE..............5. MICOM FUNCTION ......................6. EXPLANATION FOR MICOM CIRCUIT ................7. ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR......8.

  • Page 4: Warnings And Precautions For Safety

    WARNINGS AND PRECAUTIONS FOR SAFETY Please observe the following safety precautions to use the 8. Do not fray, damage, run over, kink, bend, pull out, or refrigerator safely and correctly and to prevent accident or twist the power cord. injury when servicing. 9.

  • Page 5: Specifications

    1. SPECIFICATIONS SPECIFICATIONS SPECIFICATIONS Super White Stainless Black Case Material Embo (normal) Color 36 x 33 x 70 in Door Material Stainless Dimensions Net Weight 328.5 lbs Handle Type Vista Capacity 27 cuft Display Graphic ICE PLUS Refrigerant R134a Basket, Quantity 3 full + 1half Climate class Temperate (N)

  • Page 6: Parts Identification

    2. PARTS IDENTIFICATION Use this page to become more familiar with the parts and features. Page references are included for your convenience. Note: This guide covers several different models.The refrigerator you have purchased may have some or all of the items listed below. The locations of the features shown below may not match your model. Refrigerator Lamp Automatic Ice Maker The ice is produced in the icemaker...

  • Page 7: How To Install Refrigerator

    3. HOW TO INSTALL REFRIGERATOR DOOR ALIGNMENT Adjust the level when the refrigerator door is lower than the freezer door during the installation of the refrigerator. Before adjust the doors, remove the Base Grille. Tools you need If the freezer compartment door is lower than •...

  • Page 8: Water Filter

    2. WATER FILTER 2) Replace with a new cartridge. It is recommended that you replace the filter when the Take the new cartridge out of it’s packaging and water filter indicator light turns on or your water remove protective cover from the o-rings. With dispenser or ice maker decreases noticeably.
  • Page 9 3. HOW TO CONTROL THE AMOUNT OF WATER SUPPLIED TO ICEMAKER 3-1. Confirm the amount of water supplied to the icemaker. 1) Confirm the amount of water supplied to the icemaker (1) Press the button (Figure 1) to selsct the level of water (Optimum level ¡æLarge ¡æ Small.) 2) Icemaker Operation Test (Test mode) (1) Press the button (Figure 1) for more than 3 seconds and It will start the T est mode.

  • Page 10: How To Disassemble And Assemble

    4. HOW TO DISASSEMBLE AND ASSEMBLE 1. REMOVING AND REPLACING REFRIGERATOR DOORS Before remove the doors, remove the Base Grille. To remove the right (refrigerator) door: Rivet Type 1 Type 2 1. Open the door. Remove the top hinge cover screw (1). Rivet 2.

  • Page 11: Handle Removal

    Reinstalling the rigth (Refrigerator) door 2. HANDLE REMOVAL • Loosen the set screws with a 3/32” (2.38 mm) Allen wrench and remove the handle. NOTE: If the handle mounting fasteners need to be tightened or moved, use a 1/4” (6.35 mm) Allen wrench. Rivet Mounting fasteners...

  • Page 12: Fan Shroud Grille

    3. FAN SHROUD GRILLE 4. DISPENSER 1)Disconnect funnel and button assembly by pulling down 1. Loose one screw with a screwdriver blade. and forward. 2. Disassembly of an upper grille fan: Hold upper part of an upper grille fan (U) and pull forward carefully. 3.

  • Page 13: Micom Function

    5. MICOM FUNCTION 1. MONITOR PANEL ICE TYPE CRUSH CUBE ICE PLUS HOLD 3 SECS MONTH Ice option dispenser selection ICE TYPE button Temperature adjustment button for freezer compartment FREEZER Temperature adjustment REFRIGERATOR button for refrigerator compartment Ice Plus function selection button ICE PLUS Lamp On/Off button / Filter...
  • Page 14 1-1. Display Function 1) When the appliance is plugged in, it is set to 37°F for refrigerator and 0°F for freezer. You can adjust the Refrigerator and the Freezer control temperature by pressing the ADJUST button. 2) When the power initially applied or restored after a power failure, it is set to Control temperature previously. Toggle between °C / °F Display OFF Mode Demonstration Mode...

  • Page 15: Dispenser Light

    1-5. Lock function (dispenser and display button lock) 1) When the refrigerator is first turned on, the buttons are not locked. The display panel shows the padlock unlocked icon. 2) To lock the display, the dispenser, and the control panel, press, and hold the ALARM/LOCK button for 3 seconds. The locked pad lock icon is displayed.
  • Page 16 1-9. ICE PLUS 1) The purpose of this function is to intensify the cooling speed of freezer and to increase the amount of ice. 2) Whenever selection switch is pressed, selection/ release, the icon will turn ON or OFF. 3) If there es a power outage and the refrigerator is powered on again, ICE PLUS will be canceled. 4) To activate this function, press the Ice Plus key and the icon will turn ON.
  • Page 17 1-13. Ringing of compulsory operation, compulsory frost removal buzzer 1) If pressing the test button in the main PCB, “Phi ~” sound rings. 2) In selecting compulsory operation, alarm sound is repeated and completed in the cycle of On for 0.2 second and Off for 1.8 second three times.
  • Page 18 1-16. Sequential operation of built-in product Built-in products such as compressor, frost removal heater, freezing room fan, Cooling Fan and step motor damper are sequentially operated as follows for preventing noise and part damage occurred due to simultaneous operation of a lot of parts in applying initial power and completing test.
  • Page 19 FULL OPENING FOR 10MIN/ FULL CLOSING FOR 15MIN. The following figures illustrate the errors described in the above table the figures 3, 9 and 10, only are visible on LED check function. Error7 Error8 Error9 Error10 Error1 Error2 Error3 Error4 Error5 Error6 NOTE 1:...
  • Page 20 1-17. Test Function 1. The purpose of test function is to check function of the PWB and product and to search for the failure part at the failure status. 2. T est button is placed on the main PCB of refrigerator (test switch), and the test mode will be finished after maximum 2 hours irrespective of test mode and then is reset to the normal status.
  • Page 21 6) While using dispenser ice or water function and the door is opened the operation will be stopped. 7) If the water or ice Pad exceeds 3 minutes the Geared motor, cube or water solenoid will turn OFF automatically but the duct door will remain opened 5 second after this interruption.

  • Page 22: Explanation For Micom Circuit

    6.EXPLANATION FOR MICOM CIRCUIT 1. EXPLANATION FOR PCB CIRCUIT 1-1. Power circuit The power circuit includes a Switched Mode Power Supply (SMPS). It consists of a rectifier (BD1 and CE1) converting AC to DC, a switch (IC2) switching the DC voltage, a transformer, and a feedback circuit (IC3 and IC4). Caution : Since high voltage (160 Vdc) is maintained at the power terminal, wait at least 3 minutes after unplugging the appliance to check the voltages to allow the current to dissipate.
  • Page 23 1-2. Oscillation circuit The oscillation circuit generates a basic clock signal for synchronization and time calculation related to the transmission of data and calculations made by the MICOM (IC1). The oscillator (OSC1) must always be replaced with an exact rated part, because if this spec is changes, the time calculations of the MICOM will be affected and it might not work at all.
  • Page 24 CON2 CON3 CON4 CON5 - 23 -...
  • Page 25 CON2 IC6* KID65003AF RUNNING CAPACITOR STARTING CAPACITOR COMP OMIH-SS-112LM IN4004 (AIN12) P.T.C ASSY H/BAR DOOR S/W R-LAMP(CONT'_ BOX) OZ-SS-112L1 (ALE15B12) R-DOOR IN4004 (AIN13) OPTION R-LAMP(LOWER) 7A,2mH CON3 RY15 G5NB-1A-E 330nF 275VAC SVC621-200V (SVC331-100V) (AIN14) G5NB-1A-E FUSE1 DISP' HEATER JF1JF2 250V/15A (AIN15) (ALE15B12) IN4004...
  • Page 26 Door opening sensing circuit CONNECTOR 7 CONNECTOR 9 F- DOOR S/W R- DOOR S/W 2*RD BO, PK PIN 5&6 PIN 3&4 Measuring part IC1 (MICOM) PIN 39, 40 Door of Freezer / Refrigerator Closing 5 V ( A - B , C - D . Switch at both ends are at Off status) Opening 0 V ( A - B , C - D .
  • Page 27 1-5. Temperature sensing circuit CON6 CON6 RT1* RT1* 10KF 10KF (AIN7) (AIN7) RT-SENSOR RT-SENSOR CC12* CC12* 10uF 10uF RW1* RW1* /50V /50V 26.1KF 26.1KF (AIN11) (AIN11) CC13* CC13* WT-SENSOR WT-SENSOR 10uF 10uF /50V /50V CON7 CON7 RF1* RF1* 16.2KF 16.2KF F-SENSOR F-SENSOR (AIN6)
  • Page 28 1-7. Option designation circuit (model separation function) The citrcuit configuration is Op1 open and Op2 in short, these circuits are preset at the factory and can not be altered. Separation Connection Status Application Standard Short Twisting Icemaker Open Heating Icemaker Short Dispenser Open...
  • Page 29 The motor is driven by magnetism formed in the areas of the coils and the stator. Rotation begins when a HIGH signal is applied to MICOM Pin 33 of IC10 (TA7774P). This causes an output of HIGH and LOW signals on MICOM pins 34 and 35. Explanation) The stepping motor is driven by sending signals of 3.33 mSEC via MICOM pins 33, 34, and 35, as shown in the chart below.
  • Page 30 1-9. Fan motor driving circuit (freezer, mechanical area) 1. The circuit cuts all power to the fan drive IC, resulting in a standby mode. 2. This circuit changes the speed of the fan motor by varying the DC voltage between 7.5 Vdc and 16 Vdc. 3.
  • Page 31 T emperature compensation table at the refrigerator is as follows: Modification resistance 3.3 k 5.6 k 8.2 k 10 k 12 k 18 k 33 k 56 k 180 k Current resistance 0.5 °C 1 °C 1.5 °C 2 °C 2.5 °C 3 °C 3.5 °C...
  • Page 32 2. Compensation circuit for temperature at freezer T emperature compensation in CUT JCR1 +1 °C [+1.8 °F] +2 °C [+3.6 °F] JCR2 +1 °C [+1.8 °F] JCR3 -1 °C [-1.8 °F] -2 °C [-3.6 °F] JCR4 -1 °C [-1.8 °F] Compensation Compensation T emperature compensation value...
  • Page 33 1.10 Duct door motor driving circuit CON6 CE18 100uF R59* R60* /25V 4.7K 4.7K Forward Reverse 68,1/2W BA6222 223/100V CC24* CC25* CC26* 1. When ICE PAD is pressed in order to dispense ICE (Crushed or Cubed), Duct door motor will be energized by 1 second, in order to open the duct door (+ 12V).
  • Page 34 1-11. Communication circuit and connection L/Wire between main PCB and display PCB The following communication circuit is used for exchanging information between the main MICOM of the Main PCB and the dedicated MICOM of the LED Display PCB. A bi-directional lead wire assembly between the two boards is required for the display to function properly. Poor communication occurs if a continuous information exchange fail to continue for more than 2 minutes between main MICOM of main PCB and LED dedicated MICOM for LED control of display PCB.
  • Page 35 1) Sensor resistance characteristics table Cold storage sensor 1&2 Measuring Temperature (°C) Freezing Sensor Frost removal sensor, Outside sensor -20 °C 22.3 k 77 k -15 °C 16.9 k 60 k -15 °C 13.0 k 47.3 k -5 °C 10.1 k 38.4 k 0 °C 7.8 k...
  • Page 36 CON101 IC201 KID65783AF TD62783AF IC102 5,18,19 Varef KIA78L05F (12V) AVDD CE101 CE102 CC101 CC102 CC103 47uF 100uF /25V /16V (GND) R101 IC202 R102 LD201 LD208 LD215 LD222 LD229 LD236 KID65003AF (1a) (2a) (3a) (4a) (5a) (Fä T() R201 ULN2003AF Q101 ZD101 CC104 4.7K...
  • Page 37 CON6 +12V D3SBA60 TRANS PIPE HEATER 7805 R3(PRC) Varef R25* R2(PRC) 56K,2W 4.7K +16V R106* /630V 560K 68uF 1/2W CC10* /400V 1.8K FR107 RF2* 1/8W CC30* CC31* 9.1KF R27* 1.3A,40mH 1/8W CC6* CC4* CC5* 220uF FR107 68,1/8W /16V 1000uF R89* CC3* /25V R1(PRC)

  • Page 38: Icemaker And Dispenser Working Principles And Repair

    7.ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 1. OPERATION PRINCIPLE 1-1. Operation Principle of Icemaker Power On Start Position • Adjust EJECTOR to Start Position with power on. Icemaking • Waits until water becomes cold after starting the Mode icemaking operation. Harvest •...

  • Page 39: Icemaker Functions

    2. ICEMAKER FUNCTIONS 2-1. Start Position 1. After POWER OFF or power outage, check the EJECTOR's position with MICOM initialization to restart. 2. How to check if it is in place: - Check HIGH/LOWsignals from HALL SENSOR in MICOM PIN. 3.

  • Page 40: Defect Diagnosis Function

    2-5. Function TEST 1. This is a forced operation for TEST , Service, cleaning, etc. It is operated by pressing and holding the Fill Key for 3 seconds. 2. The test works only in the Icemaking Mode. It cannot be entered from the Harvest or Fill mode. (If there is an ERROR, it can only be checked in the TEST mode.) 3.

  • Page 41: Circuit

    8. CIRCUIT DIAGRAM CIRCUIT DIAGRAM CON10 ICE LEVER S/W WATER LEVER S/W 12 DCV 12 DCV ICE VALVE PCB ASSEMBLY WATER VALVE PILOT VALVE DC SOLENOID MOTOR CON2 CON2 STARTER COMP’ ACCESORIES` PWB ASSEMBLY, PWB ASSEMBLY, LAMP LAMP * COMP ACCESSORIES *P.T.C OPTION N N N N N N 12 DCV...

  • Page 42: Trouble Diagnosis

    9. TROUBLE DIAGNOSIS 1. TroubleShooting CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 1) No power at outlet. * Measuring instrument: 1. Faulty start Multi tester 2) No power on cord. Bad connection between adapter and outlet. (faulty adapter) Check the voltage. The Inner diameter of adapter.
  • Page 43 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 2. No cooling. • Heat a clogged evaporator to 2) Refrigeration system is clogged. check it. As soon as the Moisture Residual moisture Air Blowing. Not performed. cracking sound starts, the clogged. in the evaporator.
  • Page 44 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 3. Refrigeration 1) Refrigerant Partly leaked. Weld joint leak. is weak. Parts leak. 2) Poor defrosting capacity. • Check visually. Drain path (pipe) clogged. Inject adiabatics into drain Inject through the hose. hole.
  • Page 45 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 3. Refrigeration Residual Weak heat from heater. Sheath Heater - rated. is weak. frost. Heater plate No contact to drain. Loosened stopper cord. Heater cord-L Not touching the evaporator pipe. Location of assembly (top and middle).
  • Page 46 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 3. Refrigeration 4) No cooling air circulation. is weak. Faulty fan motor. Fan is Fan shroud contact. - Clearance. constrained. Damping evaporator contact. Accumulated residual frost. Small cooling air Insufficient Fan overload. - Fan misuse. discharge.
  • Page 47 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 4. Warm 1) Colgged cooling path. refrigerator Adiabatics liquid leak. compartment Foreign materials. –– Adiabatics dump liquid. temperature. 2) Food storate. Store hot food. Store too much at once. Door open. Packages block air flow. 5.
  • Page 48 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 6. Condensation 4) Condensation on door. and ice Condensation on the duct door. - Duct door heater is cut. formation. Condensation on the Recess Heater is cut. dispense recess. Duct door is open. / Foreign material clogging. Condensation on the Not fully filled.
  • Page 49 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 7. Sounds 1) Compressor compartment operating sounds. Transformer sound. Its own fault. - Core gap. Bad connection. - Correct screw connection. Drip tray vibration sound. Bad assembly. Distortion. Foreign materials inside. Back cover machine sound. Bad connection.
  • Page 50 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 8. Faulty lamp 1) Lamp problem. Filament blows out. (freezer and Glass is broken. refrigerator 2) Bad lamp assembly. Not inserted. compartment). Loosened by vibration. 3) Bad lamp socket. Disconnection. Bad soldering. Bad rivet contact.
  • Page 51 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 10. Structure, 1) Door foam. appearance, Sag. Hinge loose Bolt is loosened during and others. transportation. Not tightly fastened. Screw worn out . Weak gasket Adhesion surface. adhesion. Fixed tape. Not well fixed. Hinge interference.
  • Page 52 2. Faults 2-1. Power Problems Causes Checks Measures Remarks No power on - Power cord cut. - Check the voltage with tester. -Replace the components. outlet. - Faulty connector insertion. - Check visually. -Reconnect the connecting parts. - Faulty connection between plug - Check visually.
  • Page 53 2-3. Temperature Problems Causes Checks Measures Remarks High Poor cool air circulation due to faulty - Lock –– Check resistance with a - Replace fan motor. temperature fan motor. tester. in the freezer 0 : short. compartment. : cut. - Reconnect and reinsert. - Rotate rotor manually and check rotation.
  • Page 54 2-4. Cooling Problems Causes Checks Measures Remarks High Refrigerant leak. Check sequence Weld the leaking part, recharge the Drier must be replaced. temperature 1. Check the welded parts of the refrigerant. in the freezer drier inlet and outlet and drier compartment.
  • Page 55 Problems Causes Checks Measures Remarks High Cycle pipe is clogged. Check sequence. - Heat up compressor discharging Direr must be replaced. temperature in 1. Check temperature of condenser weld joints with touch, disconnect the freezer manually. the pipes, and check the clogging. compartment.
  • Page 56 2-5. Defrosting failure Problems Causes Checks Measures Remarks No defrosting. Heater does not generate heat as 1. Check the resistance of heater. Heating wire is short and wire is cut. Seal the lead wire with the heating wire is cut or the circuit 0 : Short.
  • Page 57 Problems Causes Checks Measures Remarks No defrosting Melting fuse blows. - Check melting fuse with tester. - Faullty parts: parts replacement. 1) Lead wire is cut. If 0 : OK. - Check wire color when maeasuring 2) Bad soldering. : wire is cut. resistance with a tester.
  • Page 58 2-6. Icing Problems Causes Checks Measures Remarks Icing in the 1) Bad circulation of cool air. - Check the food is stored properly - Be acquainted with how to use. - Check the defrost refrigerator - Clogged intake port in the (check discharge and intake port - Sealing on connecting parts.
  • Page 59 Problem Cause Check Measure Remarks Ice in the freezer 1) Bad cooling air circulation. - Check food storage conditions - Be acquainted with how to use. - Check the parts related compartment. - Intake port is clogged in the freezer visually.(Check clogging at intake - Check defrost (Check ice on the to defrosting if the...
  • Page 60 2-7. Sound Problems Causes Checks Measures Remarks Hiss sound 1. Loud sound of compressor 1.1 Check the level of the 1) Maintain horizontal level. operation. refrigerator. 2) Replace bushing and seat if they 1.2 Check the bushing seat are sagged and aged. conditions (sagging and aging).
  • Page 61 Problems Causes Checks Measures Remarks Vibration sound. 1. Vibration of shelves and foods in 1-1. Remove and replace the 1) Reassemble the vibrating parts Clack. the refrigerator. shelves in the refrigerator and insert foam or cushion where 2. Pipes interference and capillary 1-2.
  • Page 62 Problems Causes Checks Measures Remarks Sound Popping It happens when refrigerant expands - Check the sound of refrigerant at the - Check the restrainer attached on the (almost the same at the end of capillary tube. initial installation. evaporator and capillary tube weld as animals crying - Check the sound when the refrigerator joints and attach another restrainer.
  • Page 63 2-8. Odor Problems Causes Checks Measures Remarks Food Odor. Food (garlic, kimchi, etc) - Check the food is not wrapped. - Dry the deodorizer in a sunny place - Check the shelves or inner with adequate ventilation. wall are stained with food juice. - Store the food in the closed - Be sure food is securely covered container instead of vinyl wraps.
  • Page 64 2-9. Micom Problems Symptom Causes Checks Measures Remarks Bad PCB All display Bad connection Bad connector Visual check on connector Reconnect electric power. LCD are off. between Main PCB connection from main connection. connector. and display circuit. PCB to display PCB. Defective PCB PCB transformer Check resistance of PCB...
  • Page 65 Problems Symptom Causes Checks Measures Remarks Bad cooling. Freezer Compressor does Compressor Lead Wire Check compressor Lead Wire Reconnect Lead temperature is not start. is cut. with a tester. Wire. high. Defective compressor Measure voltage at PCB CON2 Replace relay RY1 Refer to load driving relay.
  • Page 66 Problem Symptom Cause Check Measure Remarks Bad cooling Wrong Defective Step Motor Check Step Motor Check if Step Motor damper Reconnect lead Refrigerator Damper. damper motor and motor and reed switch lead wire. temperature. reed switch and lead wire are cut with a tester. wire are cut.
  • Page 67 Problems Problems Symptom Symptom Causes Causes Checks Checks Measures Measures Remarks Remarks Bad defrost. Bad defrost. Defrost is not Defrost is not Defrost lead wire is cut. Defrost lead wire is cut. Check if defrost lead wire is cut with a Check if defrost lead wire is cut with a Reconnect Lead Reconnect Lead...
  • Page 68 Problems Symptom Causes Checks Measures Remarks Defective Buzzer does Trouble mode indication. Check trouble diagnosis function. Repair troubles Refer to mode display button. not sound indication in and buttons function do not operate. explanations. Door Buzzer Buzzer Defective connecting lead wire from Check lead wire associated with door Repair lead wire.
  • Page 69 3-2. Summary Of Heavy Repair Process Contents Tools Trouble diagnosis Remove refrigerant - Cut charging pipe ends and discharge refrigerant from Filter, side cutters Residuals drier and compressor. - Use R134a oil and refrigerant for compressor and drier Pipe Cutter, Gas welder, N - Confirm N sealing and packing conditions before use.
  • Page 70 3-3. Precautions During Heavy Repair Items Precautions 1. Use of tools. 1) Use special parts and tools for R134a. 2. Recovery of refrigerant. 1) Continue to recover the refrigerant for more than 5 minutes after turning the refrigerator off. 2) Install a piercing type valve on the high pressure line (drier side). Then use the appropriate recovery equipment to recover the refrigerant from the system.
  • Page 71 3-4. Practical Work For Heavy Repair Items Precautions Evaporator 1. Removal of residual Low pressure side refrigerant. KEY POINT Hot Line Compressor Observe the sequence for removal of refrigerant. Drier Suction (If not, compressor oil may leak.) High pressure side Release Condenser Refrigent...
  • Page 72 Items Precautions Evaporator 4. Vacuum degassing. Suction pipe Hot Line Compressor Drier Condenser pressure High Blue pressure Yellow KEY POINT - If power is applied Vaccum Pump during vacuum degassing, vacuum degassing shall be more effective. Pipe Connection - Run the compressor Connect the red hose to the high pressure side and the blue hose to the while charging the system.
  • Page 73 Items Precautions Evaporator Hot Line Compressor Drier Condenser Charging Canister 4) Refrigerant Charging Charge refrigerant while operating a compressor as shown above. 5) Pinch the charging pipe with a pinch-off plier after completion of charging. 6) Braze the end of a pinched charging pipe with copper brazer and take a gas leakage test on the welded parts.
  • Page 74 3-6. Brazing Reference Drawings Pipe Assembly, Hot Line (Freezer) Cooper Brazing Copper Brazing Silver Brazing Drier assembly Capi-tube Silver Brazing Pipe assembly, suction Pipe Assembly, Joint Copper Brazing Pipe assembly, Condenser Assembly, wire joint Silver Brazing Copper Brazing Copper Brazing Copper Brazing - 73 -...
  • Page 75 4. HOW TO DEAL WITH CLAIMS 4-1. Sound Problems Checks and Measures Hiss sounds Explain general principles of sounds. • All refrigerators make noises when they run. The compressor and fan produce sounds. There is a fan in the freezer compartment which blows cool air to freezer and refrigerator compartments.
  • Page 76 Problems Checks and Measures Sounds of water flowing Explain the flow of refrigerant. • When the refrigerator stops, the water flowing sound happens. This sound happens when the liquid or vapor refrigerant flows from the evaporator to compressor. Click sounds Explain the characteristics of moving parts.
  • Page 77 4-2. Measures for Symptoms on Temperature Problems Checks and Measures Refrigeration is weak. Check temperature set in the temperature control knob. • Refrigerator is generally delivered with the button set at normal use (MID). But customer can adjust the temperature set depending on their habit and taste. If you feel the refrigeration is weak, then set the temperature control button at strong position.
  • Page 78 4-3. Odor and Frost Problems Checks and Measures Odor in the refrigerator compartment. Explain the basic principles of food odor. • Each food has its own particular odor. Therefore it is impossible to prevent or avoid food odor completely when food is stored in the completely sealed refrigerator compartment.
  • Page 79 4-4. Others Problems Checks and Measures The refrigerator case is hot. Explain the principles of radiator. • The radiator pipes are installed in the refrigerator case and partition plate between the refrigerator and the freezer compartment in order to prevent condensation formation.

  • Page 80: Exploded View

    #EV# 10. EXPLODED VIEW FREEZER DOOR PART 131C 606A 600A 200A 131D 203A 201A 131B 131A 614A 244A 212J 241G 241G 241E 243A -79-...
  • Page 81 #EV# EXPLODED VIEW REFRIGERATOR DOOR 230A 241A 241C 231A 233A 241B 212G 241H 237A 244A 241H 212J 237A 241H 241D 243B -80-...
  • Page 82 #EV# EXPLODED VIEW FREEZER COMPARTMENT 281A 281C 120D 406A 271B 271A 330B 902B 405G 404A 332A 405A 610E 329A 149C 903E 316B 409A 301A 128C 158C 128E 128D 128F 149A 401A 281G 149B 106A 418A 136A 332B 103C 319B 136B -81-...
  • Page 83 #EV# EXPLODED VIEW REFRIGERATOR COMPARTMENT 140A 281B 281D 146A 406A 271B 611E 271C 611C 128G 141A 140B 128H 610E 120B 120A 903D 610E 170A 903D 409A 604H 161A 128J 158A 128K 161B 281K 151A 281H 106A 154A 409A 128A 151B 128B 158B -82-...
  • Page 84 #EV# EXPLODED VIEW ICE & WATER PART DISPENSER PARTS 625A 616F 616G 627A 627D 623A 113F 405H 282G 412A 619A 607A 280A 621B 616K 621D 276C 276B 500D 280F 501D 278G 402C 500E 279B 279A * 279C 281J 281F 501B *Only STS model -83-...
  • Page 85 #EV# EXPLODED VIEW MACHINE COMPARTMENT SVC KIT COMPRESSOR 308A 307B 309A 310A 412D 419B 307A 314A 328A 501F 103B 411A 410G 410H 308A 309A 501A 103A 501K 310A 412D 304A 316A 307A 419B 314A 317A 328A 323B 318A 105A 312A 319C 329C 405F...
  • Page 86 February, 2010 MFL62215915 Rev. 05...

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