LG GR-GR-L257BTBA Service Manual
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LG GR-GR-L257BTBA Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS BOOK
BEFORE CHECKING OR OPERATING THE REFRIGERATOR.
MODEL: GR-L257NI
Ref. No.
GR-GR-L257BTBA
http://biz.lgservice.com
COLOR: TITANIUM

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Summary of Contents for LG GR-GR-L257BTBA

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS BOOK BEFORE CHECKING OR OPERATING THE REFRIGERATOR. Ref. No. GR-GR-L257BTBA MODEL: GR-L257NI COLOR: TITANIUM...

  • Page 2: Table Of Contents

    CONTENTS WARNINGS AND PRECAUTIONS FOR SAFETY ........................ 3 SPECIFICATIONS................................... 4 PARTS IDENTIFICATION ..............................12 HOW TO INSTALL THE REFRIGERATOR .......................... 18 HOW TO ADJUST DOOR HEIGHT OF THE REFRIGERATOR ..................18 HOW TO INSTALL WATER PIPE............................19 HOW TO CONTROL THE AMOUNT OF WATER SUPPLIED TO THE ICEMAKER ............23 MICOM FUNCTION ................................

  • Page 3: Warnings And Precautions For Safety

    WARNINGS AND PRECAUTIONS FOR SAFETY Please observe the following safety precautions in order to 8. Do not fray, damage, machine, heavily bend, pull out, use safely and correctly the refrigerator and to prevent or twist the power cord. accident and danger during repair. 9.

  • Page 4: Specifications

    SPECIFICATIONS 1. Ref No. : GR-P257 ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS (mm) 894(W) 875(D) 1753(H) FIRST DEFROST 4 - 5 Hours NET WEIGHT (kg) DEFROST CYCLE 13 - 15 Hours COOLING SYSTEM Fan Cooling DEFROSTING DEVICE Heater, Sheath TEMPERATURE CONTROL Micom Control ANTI SWEAT HEATER Dispenser Duct Door Heater...
  • Page 5 SPECIFICATIONS 2. Ref No. : GR-P217 ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS (mm) 894(W) 790(D) 1753(H) FIRST DEFROST 4 - 5 Hours NET WEIGHT (kg) DEFROST CYCLE 13 - 15 Hours COOLING SYSTEM Fan Cooling DEFROSTING DEVICE Heater, Sheath TEMPERATURE CONTROL Micom Control ANTI SWEAT HEATER Dispenser Duct Door Heater...
  • Page 6 SPECIFICATIONS 3. Ref No. : GR-L257 ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS (mm) 894(W) 875(D) 1753(H) DRIER MOLECULAR SIEVE XH-7 NET WEIGHT (kg) FIRST DEFROST 4 - 5 Hours COOLING SYSTEM Fan Cooling DEFROST CYCLE 13 - 15 Hours TEMPERATURE CONTROL Micom Control DEFROSTING DEVICE Heater, Sheath...
  • Page 7 SPECIFICATIONS 4. Ref No. : GR-L217 ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS (mm) 894(W) 790(D) 1753(H) DRIER MOLECULAR SIEVE XH-7 NET WEIGHT (kg) FIRST DEFROST 4 - 5 Hours COOLING SYSTEM Fan Cooling DEFROST CYCLE 13 - 15 Hours TEMPERATURE CONTROL Micom Control DEFROSTING DEVICE Heater, Sheath...
  • Page 8 SPECIFICATIONS 1. Ref No. : GR-C257 ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS (mm) 894(W) 875(D) 1753(H) FIRST DEFROST 4 - 5 Hours NET WEIGHT (kg) DEFROST CYCLE 13 - 15 Hours COOLING SYSTEM Fan Cooling DEFROSTING DEVICE Heater, Sheath TEMPERATURE CONTROL Micom Control ANTI SWEAT HEATER Home Bar Heater...
  • Page 9 SPECIFICATIONS 2. Ref No. : GR-C217 ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS (mm) 894(W) 790(D) 1753(H) FIRST DEFROST 4 - 5 Hours NET WEIGHT (kg) DEFROST CYCLE 13 - 15 Hours COOLING SYSTEM Fan Cooling DEFROSTING DEVICE Heater, Sheath TEMPERATURE CONTROL Micom Control ANTI SWEAT HEATER Home Bar Heater...
  • Page 10 SPECIFICATIONS 3. Ref No. : GR-B257 ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS (mm) 894(W) 875(D) 1753(H) DRIER MOLECULAR SIEVE XH-7 NET WEIGHT (kg) FIRST DEFROST 4 - 5 Hours COOLING SYSTEM Fan Cooling DEFROST CYCLE 13 - 15 Hours TEMPERATURE CONTROL Micom Control DEFROSTING DEVICE Heater, Sheath...
  • Page 11 SPECIFICATIONS 4. Ref No. : GR-B217 ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS (mm) 894(W) 790(D) 1753(H) DRIER MOLECULAR SIEVE XH-7 NET WEIGHT (kg) FIRST DEFROST 4 - 5 Hours COOLING SYSTEM Fan Cooling DEFROST CYCLE 13 - 15 Hours TEMPERATURE CONTROL Micom Control DEFROSTING DEVICE Heater, Sheath...

  • Page 12: Parts Identification

    PARTS IDENTIFICATION 1. Ref No. : GR-P257, GR-P217 Cover Hinge Cover PWB Frame Display Water Tube Dispenser Lamp Ice & Water Dispenser Button Home Bar Freezer Refrigerator Ice Shelf Compartment Compartment Assembly Cover, Dairy Door Rack Cover, Lamp-R/U Ice Bank Shelf Assembly Guide Bottle...
  • Page 13 PARTS IDENTIFICATION 2. Ref No. : GR-P257, GR-P217 Cover Hinge Cover PWB Frame Display Dispenser Lamp Ice & Water Dispenser Button Home Bar Freezer Refrigerator Ice Shel Compartment Compartment Assembly Cover, Dairy Door Rack Cover, Lamp-R/U Ice Bank Shelf Assembly Guide Bottle Cover,Lamp -F Wine Rack...
  • Page 14 PARTS IDENTIFICATION 3. Ref No. : GR-L257, GR-L217 Cover Hinge Cover PWB Frame Display Water Tube Dispenser Lamp Ice & Water Dispenser Button Freezer Refrigerator Compartment Compartment Ice Shelf Assembly Cover, Dairy Door Rack Cover, Lamp-R/U Ice Bank Shelf Assembly Guide Bottle Cover,Lamp -F Wine Rack...
  • Page 15 PARTS IDENTIFICATION 4. Ref No. : GR-L257, GR-L217 Cover Hinge Cover PWB Frame Display Water Tube Dispenser Lamp Ice & Water Dispenser Button Freezer Refrigerator Compartment Compartment Ice Shelf Assembly Cover, Dairy Cover, Lamp-R/U Door Rack Shelf Ice Bank Assembly Guide Bottle Cover,Lamp -F Wine Rack...
  • Page 16 PARTS IDENTIFICATION 1. Ref No. : GR-C257, GR-C217 Cover Hinge Cover PWB Frame Display Home Bar Freezer Refrigerator Compartment Compartment Control Box,R Cover, Dairy Cover, Lamp-R/U Shelf Guide Bottle Wine Rack Shelf -F Egg Box Shelf Snack Corner (Optional) Triple & Movable Cover Home Bar Twist Ice Tray Folding Shelf...
  • Page 17 PARTS IDENTIFICATION 3. Ref No. : GR-B257, GR-B217 Cover Hinge Cover PWB Frame Display Freezer Refrigerator Compartment Compartment Control Box,R Cover, Dairy Cover, Lamp-R/U Shelf Guide Bottle Wine Rack Shelf -F Egg Box Shelf Snack Corner (Optional) Triple & Movable Twist Ice Tray Folding Shelf Cover, Lamp-R/L...

  • Page 18: How To Install The Refrigerator

    HOW TO INSTALL REFRIGERATOR 1. How to Adjust Door Height of Refrigerator I Make the refrigerator level first. (If the refrigerator is not installed on the flat floor, the height of freezer and refrigerator door may not be the same.) 1.

  • Page 19: How To Install Water Pipe

    HOW TO INSTALL REFRIGERATOR 2. How to Install Water Pipe 2-1. When connecting directly to the water tap. I Please confirm the following installation parts. I Before Installation 1. The icemaker requires the water pressure of 1.5 - 8.5kgf/cm . (It is acceptable if city water fills a cup of 180cc with water for 3 seconds) 2.
  • Page 20 HOW TO INSTALL REFRIGERATOR 1. Connection of Pipe Connector A and B. Caution : • Feed pipe should be connected to cold water line. If it is connected to hot water line, trouble 1) Turn off main valve of water pipe. may occur.
  • Page 21 HOW TO INSTALL REFRIGERATOR 3. When customer uses bottled water. *If customer wants to use bottled water, extra pump should be installed as shown below. 1. The pump system should not be on the floor (it may cause noise and vibration). Securely fasten the inlet and outlet nuts of pump.
  • Page 22 HOW TO INSTALL REFRIGERATOR I Install Water Filter (Applicable to some models only) I Before Installing water filter Control box 1. Before installing the filter, take out the top shelf of the refrigerator after tilting it to the direction ( ) and lifting it to the direction ( ) and move it to the lower part.

  • Page 23: How To Control The Amount Of Water Supplied To The Icemaker

    HOW TO INSTALL REFRIGERATOR 3. How to Control the Amount of Water Supplied to Icemaker. 3-1. Confirm the amount of water supplied to the icemaker. 1. Pull out the ice bank in the upper part of the freezer compartment. Caution : • Do not put hands or tools into the chute to confirm the operation of geared motor.
  • Page 24 HOW TO INSTALL REFRIGERATOR 3-2. Control the amount of water supplied to the Caution : When adjusting the amount of water supplied, adjust step by step. Otherwise the water may icemaker. spill over. Caution : • Please unplug the power cord from the wall outlet and wait for more than three minutes before disconnecting PWB cover as 310V is applied in the control panel.

  • Page 25: Micom Function

    MICOM FUNCTION 1. Monitor Panel 1-1. GR-P257, GR-P217, GR-L257, GR-L217 °C °C ICEBEAM FILTER RESET ° CUBE HOLD 3 SECS °F °F DOOR COOLING ° FILTER STATUS FRZ TEMP REF TEMP EXPRESS FRZ ROOM TEMP WATER LOCK CRUSH UNLOCK JET FRZ EXPRESS FRZ DISPENSER FREEZER...
  • Page 26 MICOM FUNCTION 2-1-2. LCD Back Light Control 1. In order to easily view display status on the LCD, LCD Back Light is turned on for a minute in application of initial power, for a minute in button manipulation and for a minute after closing time from opening time of door. 2.
  • Page 27 MICOM FUNCTION 2-2. Dispenser use selection CUBE You can select water or ice. DISPENSER DISPENSER ❉ Please select water, slice ice and square ice by pressing button as you desire. WATER ❉ Please press the push button lightly by catching and pushing in cup. CRUSH •...
  • Page 28 MICOM FUNCTION 2-7. Super freezing 1. Super freezing is function to improve cooling speed of the freezing room by consecutively operating compressors and freezing room fan. If pressing the super freezing button, “Turn Off” text of the LCD panel is turned off and “Turn On” is immediately turned on and “Arrow ( )”...
  • Page 29 MICOM FUNCTION 2-10. Control of M/C room fan motor 1. The M/C room fan motor performs ON/OFF control by linking with the COMP. 2. It controls at the single RPM without varying RPM. 3. Failure sensing method is same as in fan motor of freezing fan motor (refer to failure diagnosis function table for failure display).
  • Page 30 MICOM FUNCTION 2-15. 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 31 MICOM FUNCTION 2-16. Failure Diagnosis Function 1. Failure diagnosis function is function to facilitate service when nonconforming matters affecting performance of product during use of product. 2. In occurrence of failure, pressing the function adjustment button does not perform function. 3.
  • Page 32 MICOM FUNCTION Note1) Freezer room notch temperature display and refrigerator room notch temperature display(Failure code indication part) are normally indicated in abnormal ambient sensor, and “Er” indicated on the amvient temperature display(except for the ambient temperature display, other LCDs are indicated normally) Note2) R2-sensor, Ice-maker sensor miracle zone sensor and Ice-maker kit is not indicated on the failure indicating part but indicated in checking LCD(When pressing for more than the button of freezing temperature and super freezer button for more than 1 second).
  • Page 33 MICOM FUNCTION ✻ LCD check function: If simultaneously pressing super freezer button and freezing temperature adjustment button for a second, a back light is turned on and all display LCD graphics on. If releasing the button, the LCD graphic displays the previous status, the back light is turned off (LCD graphic and back light ON/OFF check).

  • Page 34: Explation For Micom Circuit

    EXPLATION FOR MICOM CIRCUIT 1. Explanation for PWB circuit 1-1. Power circuit 1. GR-P257, L257, C257, B257 / P217, L217, C217, B217 Power circuit consists of SMPS (SWITCHING MODE POWER SUPPLY) power. The SMPS consist of the rectifying part (BD1, CE1) converting AC voltage to DC voltage, the switching part (IC2) switching the converted DC voltage, transformer transferring energy of the primary side of the switching terminal to the secondary side and the feedback part (IC3, IC4) transferring it to the primary side.
  • Page 35 EXPLATION FOR MICOM CIRCUIT 1-2. Oscillation circuit Oscillation circuit is a circuit with the purpose of generating basic time for clock occurrence for synchronization and time calculation in relation with information transmission/reception of inside elements of IC1 (MICOM). The OSC1 must always use rated parts since if SPEC is changed, time calculated at the IC1 may be changed or no operation is done.
  • Page 36 EXPLATION FOR MICOM CIRCUIT 1-4. Load/dispenser operation, door opening circuit 1. LOAD DRIVING CIRCUIT ✽ In even if opening the door of freezing room or cold storage room during operation of fan motor at the freezing room, this circuit does not stop and operates at the standard RPM. In addition, if doors of freezing room or cold storage room, the fan motor normally operates at the RPM previously operated.
  • Page 37 EXPLATION FOR MICOM CIRCUIT 2) GR-C257, B257, C217, B217 ✽ The fan motor at the freezing room does not stop but operates if opening doors of the freezing room or cold storage room or the home bar during operation of the fan motor at the freezing room. ✽...
  • Page 38 EXPLATION FOR MICOM CIRCUIT 2. Dispenser operation circuit 1) Check load driving status WATER VALVE GEARED SOLENOID SOLENOID SOLENOID Type of Load MOTOR CUBE DISPENSER PILOT WATER Measuring part IC6-11 IC6-10 IC7-16 IC7-15 IC7-13 IC7-14 Within 1 V Status 12 V 2) Lever S/W sensing circuit Measuring part IC1(Micom) (No.
  • Page 39 EXPLATION FOR MICOM CIRCUIT 3. Door opening sensing circuit 1) GR-P257, L257, P217, L217 2) GR-C257, B257, C217, B217 Measuring part IC1 (MICOM) No. 45, 46 Pin Door of Freezing/Cold Storage Room Closing 5 V ( A - B , C - D . S/W at both ends are at Off status) Opening 0 V ( A - B , C - D .
  • Page 40 EXPLATION FOR MICOM CIRCUIT 1-5. Temperature sensing circuit 1) GR-P257, L257, P217, L217 (R)J1 (R)J2 The above circuits are circuits attached to freezing room sensor or cold storage room sensor for adjusting setting temperature at the freezing room and cold storage room, ice-making sensor for sensing water temperature in ice-making, or an evaporator for sensing temperature of a frost removal sensor necessary for frost removal.
  • Page 41 EXPLATION FOR MICOM CIRCUIT 2) GR-C257, B257, C217, B217 (R)J1 (R)J2 The above circuits are circuits attached to freezing room sensor or cold storage room sensor for adjusting setting temperature at the freezing room and cold storage room, ice-making sensor for sensing water temperature in ice-making, or an evaporator for sensing temperature of a frost removal sensor necessary for frost removal.
  • Page 42 EXPLATION FOR MICOM CIRCUIT 1-6. Switch entry circuit The following circuits are entry circuits for sensing signal form test S/W, electronic single motor damper reed S/W for examining refrigerator. 1) GR-P257, L257, P217, L217 2) GR-C257, B257, C217, B217 1-7. Option designation circuit (model separation function) 1) GR-P257, L257, P217, L217 2) GR-C257, B257, C217, B217 The above circuits are used for designating separation by model as option and notifying it to MICOM.
  • Page 43 EXPLATION FOR MICOM CIRCUIT 1-8. Stepping motor operation circuit (cold storage room, Miracle Zone) For motor driving method, rotation magnetism is formed at coils wound on each phase of motor and stator and so motor becomes to rotate if applying “High” signal to the IC8 (TA777AP) at the MICOM PIN 33 and outputting “High”, “Low” signal by step numbers fixed through MICOM PIN 34 and 35,.
  • Page 44 EXPLATION FOR MICOM CIRCUIT 1-9. Fan motor driving circuit (freezing room, M/C room) 1. This circuit performs function to make standby power ‘0’ by cutting off power supplied to ICs inside of the fan motor in the fan motor OFF. 2.
  • Page 45 EXPLATION FOR MICOM CIRCUIT 2) GR-C257, B257, C217, B217 - 45 -...
  • Page 46 EXPLATION FOR MICOM CIRCUIT 1-10. Temperature compensation and over-cool/weak-cool compensation circuit 1. Temperature compensation at freezing room, cold storage room 1) GR-P257, L257, P217, L217 2) GR-C257, B257, C217, B217 (R)J1 (R)J2 : JUMP WIRE Freezing room Cold storage room Resistance value Temperature Resistance value...
  • Page 47 EXPLATION FOR MICOM CIRCUIT u Temperature compensation table at the cold storage room is as follows: Modification resistance 470 Ω 2 kΩ 3.3 kΩ 5.6 kΩ 8.2 kΩ 10 kΩ 12 kΩ 18 kΩ 33 kΩ 56 kΩ 180 kΩ Current resistance 0.5 °C...
  • Page 48 EXPLATION FOR MICOM CIRCUIT u Temperature compensation table at the freezing room is as follows: Change J1: 5.1 kΩ J1: 3.9 kΩ J1: 2.7 kΩ J1: 1.8 kΩ J1: 910 Ω J1: resistance J2: 1.2 kΩ J2: 2.4 kΩ J2: 3 kΩ J2: 5.1 kΩ J2: 6.2 kΩ resistance J1: 5.1 kΩ...

  • Page 49: Compensation Circuit For Weak-Cold, Over-Cold At Freezing Room

    EXPLATION FOR MICOM CIRCUIT 2. Compensation circuit for weak-cold, over-cold at freezing room 1) GR-P257, L257, P217, L217 2) GR-C257, B257, C217, B217 Temperature compensation in CUT JCR1 +1 °C +2 °C JCR2 +1 °C JCR3 -1 °C -2 °C JCR4 -1 °C Compensation...
  • Page 50 1-11. Miracle Zone STEPPING MOTOR / Display Miracle zone stepping motor damper is same as 1-8 stepping motor operation circuit and the miracle zone display turns on only when the R-door opens. - 50 -...
  • Page 51 EXPLATION FOR MICOM CIRCUIT 1-12. Communication circuit and connection L/Wire between main PCB and display PCB The following circuit is a communication circuit used for exchanging the necessary information between main MICOM of main PCB and LCD dedicated MICOM for LCD control of display PCB. Transmission/receipt L/Wire together with the necessary display PCB for driving the display PCB is required.
  • Page 52 EXPLATION FOR MICOM CIRCUIT 2) GR-C257, B257, C217, B217 ° ° ° LOCK ° ° ° FRZ TEMP ICEBEAM DOOR COOLING 1 2 3 4 5 REF TEMP ROOM TEMP 5 4 3 2 1 UNLOCK 2. Sensor resistance characteristics table Cold storage sensor 1, 2.

  • Page 53: Pwb Parts Drawing And List

    EXPLATION FOR MICOM CIRCUIT 3. PWB parts diagram and list 3-1. PWB Assembly main part diagram 1. GR-P257, L257, P217, L217 - 53 -...
  • Page 54 EXPLATION FOR MICOM CIRCUIT 2. GR-C257, B257, C217, B217 - 54 -...
  • Page 55 EXPLATION FOR MICOM CIRCUIT 3-2. Parts list 1. GR-P257, L257, P217, L217 - 55 -...
  • Page 56 EXPLATION FOR MICOM CIRCUIT - 56 -...
  • Page 57 EXPLATION FOR MICOM CIRCUIT 2. GR-C257, B257, C217, B217 - 57 -...
  • Page 58 EXPLATION FOR MICOM CIRCUIT - 58 -...
  • Page 59 EXPLATION FOR MICOM CIRCUIT 3-3. DISPLAY ASSEMBLY part diagram 1. GR-P257, L257, P217, L217 - 59 -...
  • Page 60 EXPLATION FOR MICOM CIRCUIT 2. GR-C257, B257, C217, B217 - 60 -...
  • Page 61 3-4. DISPLAY circuit diagram 1. GR-P257, L257, P217, L217 - 61 -...
  • Page 62 2. GR-C257, B257, C217, B217 - 62 -...

  • Page 63: Pwb Circuit Diagram

    EXPLATION FOR MICOM CIRCUIT 4. PWB circuit diagram - PWB circuit diagram may vary a little bit depending on actual condition. 1. GR-P257, L257, P217, L217 - 63 -...
  • Page 64 EXPLATION FOR MICOM CIRCUIT - 64 -...
  • Page 65 EXPLATION FOR MICOM CIRCUIT 2. GR-C257, B257, C217, B217 - 65 -...
  • Page 66 EXPLATION FOR MICOM CIRCUIT - 66 -...

  • Page 67: Ice Maker And Dispenser Operation Principle And Repair Method

    ICE MAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD 1. Working Principles 1-1. Ice Maker Working Principles Power Input Initial Control • Level Ice Maker Cube Mould for “Initial Control” after power is input. Ice Making Control • Wait until the water in the cube mould is frozen after ice maker starts operation.

  • Page 68: Function Of Ice Maker

    ICE MAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD 2. Function of Ice Maker 2-1. Initial Control Function 1. When power is initially applied or reapplied after power cut, it detects level of ice maker cube mould after completion of MICOM initialization.
  • Page 69 ICE MAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD 2-4. Ice Ejection Control Function 1. This is to eject ice from ice maker cube mould after ice making is completed. 2. If Hall IC signal is on within 3.6 seconds after ice ejection motor rotates in normal direction, it does not proceed ice ejection but waits.
  • Page 70 ICE MAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD 2-5 Test Function 1. It is to force the operation during operation test, service, and cleaning. The test switch is mounted under the automatic ice maker. The test function starts when the test switch is pressed for more than 0.5 second. 2.

  • Page 71: Ice Maker Troubleshooting

    ICE MAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD 3. Ice Maker Troubleshooting * Troubleshooting: it is possible to confirm by pressing freezer and refrigerator temperature control buttons for more than 1 second. (ice maker is normal if all leds are on): refer to trouble diagnposis function in MICOM function 2-8 (page 18) Is DC Power (5V and 12V) Failed DC Power...

  • Page 72: Ice Maker Circuit Part

    ICE MAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD 4. Ice maker circuit part The above ice maker circuit is applied to the GR-P257/217, GR-L257/217 and consists of the ice maker unit part installed at the freezing room and the ice maker driving part of the main PWB. Water supply to the ice maker container is done by opening the valve for the established water supply time by operating the container via a solenoid relay for the ice valve of the solenoid valve placed at the M/C room.

  • Page 73: Circuit

    CIRCUIT 3854JD1103A - 73 -...
  • Page 74 CIRCUIT 3854JD1103A - 74 -...

  • Page 75: Trouble Diagnosis

    TROUBLE DIAGNOSIS 1. Trouble Shooting CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK * Measuring instrument : 1) No power on outlet. 1. Faulty start Multi tester 2) No power on cord. I Check the voltage. Bad connection between adapter and outlet. (faulty adapter) The Inner diameter of adapter.
  • Page 76 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK I Check the clogged 2. No cooling. 2) Refrigeration system is clogged. evaporator by heating (as Moisture Residual moisture Air Blowing. Not performed. soon as the cracking sound clogged. in the evaporator. Too short.
  • Page 77 TROUBLE DIAGNOSIS 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. I Check visually. Drain path (pipe) clogged. Inject P/U into drain hose. Inject through the hole.
  • Page 78 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 3. Refrigeration Residual Weak heat from heater. Sheath Heater - rated. is weak. frost. Heater plate - rated. Too short defrosting time. Defrost Sensor. - Faulty characteristics. Seat-D(missing, location. thickness). Structural fault.
  • Page 79 TROUBLE DIAGNOSIS 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.
  • Page 80 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 4. Warm 1) Colgged cooling path. refrigerator P/U liquid leak. compartment Foreign materials. –– P/U dump liquid. temperature. 2) Food storate. Store hot food. Store too much at once. Door open. Packages block air flow.
  • Page 81 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 6. Dew and 4) Dew on door. ice formation. Dew on the duct door. - Duct door heater is cut. Dew on the dispense Recess Heater is cut. recess. Duct door is open. / Foreign material clogging. Dew on the door surface.
  • Page 82 TROUBLE DIAGNOSIS 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.
  • Page 83 TROUBLE DIAGNOSIS 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.
  • Page 84 TROUBLE DIAGNOSIS CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK 10. Structure, 1) Door foam. appearance Sag. Weak torque of Bolt is loosened during and others. hinge connection. transportaion. Not tightly fastened. Screw worn out . Weak gasket Adhesion surface. adhesion.

  • Page 85: Faults

    TROUBLE DIAGNOSIS - 85 -...
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  • Page 102: Cooling Cycle Heavy Repair

    TROUBLE DIAGNOSIS 3. Cooling Cycle Heavy Repair 3-1. The Heavy Repair Standards for Refrigerator with R134a Refrigerant Items Unit Standards Purposes Remarks Pipe and piping Min. Pipe:within 1 hour. To protect The opening time should be reduced to a system opening time. Comp:within Moisture half of the standards during rain and...
  • Page 103 TROUBLE DIAGNOSIS 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 104 TROUBLE DIAGNOSIS 3-3. Precautions During Heavy Repair Items Precautions 1. Use of tools. 1) Use special parts and tools for R134a. 2. Removal of retained 1) Remove retained refrigerant more than 5 minutes after turning off a refrigerator. refrigerant. (If not, oil will leak inside.) 2) Remove retained refrigerant by cutting first high pressure side (drier part) with a nipper and then cut low pressure side.
  • Page 105 TROUBLE DIAGNOSIS 3-4. Practical Work For Heavy Repair Items Precautions 1. Removal of residual Evaporator Low pressure side refrigerant. KEYPOINTING Observe the sequence for Compressor removal of refrigerant. Drier Suction (If not, compressor oil may leak.) High pressure side Release Condenser Refrigent Intake...
  • Page 106 TROUBLE DIAGNOSIS Items Precautions 4.Vacuum degassing. Evaporator Suction pipe Compressor Drier Condenser pressure High Blue pressure Yellow Vaccum Pump KEYPOINTING - If power is applied during vacuum degassing, vacuum degassing shall be more effective. Pipe Connection - Operate compressor Connect a red hose to the high pressure side and a blue hose to the while charging refrigerant.
  • Page 107 TROUBLE DIAGNOSIS Items Precautions Evaporator Compressor Drier Condenser Bombe 4) Refrigerant Charging Charge refrigerant while operating a compressor as shown above. 5) Pinch a 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 108 TROUBLE DIAGNOSIS 3-6. Brazing Reference Drawings 1) Asia / Middle-East Africa PIPE ASSEMBLY HOT LINE PIPE ASSEMBLY HOT LINE (Refrigerator) (Freezer) Copper(Silver) Copper Brazer Brazer CAPI - TUBE DRIER ASSEMBLY Copper(Silver) Silver Brazer Brazer PIPE ASSEMBLY PIPE ASSEMBLY JOINT SUCTION Copper Brazer PIPE ASSEMBLY...

  • Page 109: How To Deal With Claims

    TROUBLE DIAGNOSIS 4. HOW TO DEAL WITH CLAIMS 4-1. Sound Problems Checks and Measures I Explain general principles of sounds. "Whizz" sounds • All refrigerator when functioning properly have normal operating sound. The compressor and fan produce sounds. There is a fan in the freezer compartment which blows cool air to freezer and refrigerator compartments.
  • Page 110 TROUBLE DIAGNOSIS Problems Checks and Measures I Explain the flow of refrigerant. Sounds of water flowing • When the refrigerator stops, the water flowing sound happens. This sound happens when the liquid or vapor refrigerant flows from the evaporator to compressor. I Explain the characteriistics of moving parts.
  • Page 111 TROUBLE DIAGNOSIS 4-2. Measures for Symptoms on Temperature Problems Checks and Measures I Check temperature set in the temperature control knob. Refrigeration is weak. • 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”...
  • Page 112 TROUBLE DIAGNOSIS 4-3. Odor and Frost Problems Checks and Measures I Explain the basic principles of food odor. Odor in the refrigerator compartment. • Each food has its own peculiar odor. Therefore it is impossible to prevent or avoid food odor completely when food is stored in the completely sealed refrigerator compartment.
  • Page 113 TROUBLE DIAGNOSIS 4-5. Others Problems Checks and Measures I Explain the principles of radiator. The refrigerator case is hot. • 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 114: How To Disassemble And Assemble

    HOW TO DISASSEMBLE AND ASSEMBLE 1. DOOR (3) Disconnect upper hinge from a hinge supporter by grasping the front part of upper hinge and lifting up (Hinge Assembly, U) in arrow direction A and pull 1) Remove lower cover and then disconnect water forward in arrow B direction.

  • Page 115: Handle

    HOW TO DISASSEMBLE AND ASSEMBLE 2. HANDLE 4) Disassembly of a grille fan (L) : Hold upper part of a grille fan(L) and pull forward carefully. 1) Put blade screwdriver into a groove on the side of a 5) Loosen two screws. Deco handle and lift up a little bit in arrow direction 6) Disassembly of shroud.

  • Page 116: Dispenser

    HOW TO DISASSEMBLE AND ASSEMBLE 5. DISPENSER 4) Loosen four screws with a phillips screwdriver and pull a funnel Assembly to disconnect. 1) Disconnect button assembly by pulling down until it stops and then pulling forward. Funnel Assembly Funnel Assembly Button 5) Duct cap Assembly is disconnected if hold lever connecting screw is loosened with a phillips screwdriver.
  • Page 117 HOW TO DISASSEMBLE AND ASSEMBLE 7) Dispenser Related Parts 277A FRAME ASSEMBLY DISPLAY COVER, DISPENSER PWB(PCB) ASSEMBLY DISPLAY FUNNEL ASSEMBLY SWITCH, MICRO FRAME, FUNNEL 10 LEVER(SWITCH) 11 FUNNEL 12 RUBBER, FUNNEL 13 SWITCH, ROCKER 14 SOLENOID ASSEMBLY 15 SPRING 16 HOLDER, LEVER 17 CAP, DUCT 19 LEVER, DISPENSER 20 RUBBER, CAP...

  • Page 118: Water Tank And Water Line

    HOW TO DISASSEMBLE AND ASSEMBLE 7-2. Home Bar parts disassembly and assembly 6. WATER TANK AND WATER LINE 1) Disconnect H/Bar Door Assembly u The water tank at back and lower part of a refrigerator is fixed by one screw and has a capacity containing 7 2) Loosen two screws attached on the refrigerator glasses (180cc per glass) of cold water.

  • Page 119: Exploded View

    EXPLODED VIEW FREEZER DOOR PART: GR-P257, GR-P217, GR-L257, GR-L217 200A 202A 205A 205E 205C 210A 205B 205D 210B 205F 201A 203A - 119 -...
  • Page 120 EXPLODED VIEW FREEZER DOOR PART: GR-C257, GR-C217, GR-B257, GR-B217 200A 202A 205A 205E 210A 205C 210A 205B 279A 501A 280D 279D 279E 210B 280F 205D 280E 279B 279C 205F 210B 210B 201A 203A - 120 -...
  • Page 121 EXPLODED VIEW Ref No. : GR-P257, GR-P217, GR-C257, GR-C217 REFRIGERATOR DOOR PART : Optional part 241A 241C 230A 241B 147C 232A 147B 147A 239A 243A 205A 240A 205E 264B 205C 402B 250A 266A 238B 617A 266C 265A 264C 267A 238A 260A 264A 243A...
  • Page 122 EXPLODED VIEW Ref No. : GR-L257, GR-L217, GR-B257, GR-B217 REFRIGERATOR DOOR PART : Optional part 241A 230A 241C 241B 232A 147C 212G 147B 147A 205A 243A 205E 205C 240A 243A 240A 205B 205D 240C 205F 240C 233A 231A - 122 -...
  • Page 123 EXPLODED VIEW FREEZER COMPARTMENT : Optional part 270A 271B 271A 137B 137A 120B 136D 402A 403A 120B 136B 136C 136A 135A 131J 120D 400A 152A 130A 302B 131E 401A 131B 128C 128E 128D 131C 131H 131D 128F 132A 120C 272A 105D 103A 408A...
  • Page 124 EXPLODED VIEW REFRIGERATOR COMPARTMENT 140A or 142A : Optional part 146A 171A 171B 270B 141A 271B 271C 141B 626C 626B 626A 115A 116A 115B 141D 149C 170A 402A 115C 624C 152A 180C 151B 401A 178A 151C 180B 150A 180A 151A 178B 155A 162A...
  • Page 125 EXPLODED VIEW ICE & WATER PART : Optional part 622A 625A 618A 616E 624B 616F 616G 616D 623A 627A 623B 404A 619A 612A 612C 612B 600A 610A 611A 607A 602A 611C 605A 604A 616C 616A 611B 611D 601A 616A 603B 616B 603A 615A...
  • Page 126 EXPLODED VIEW MACHINE COMPARTMENT : Optional part 101B 406A 502A 101A 410H 410G 303A 500A 303B 502B 304A 303C 303D 313A 300A 310B 307A 307A 317A 301A 317B 104A 306A 308B 309A 309C 305A 403B 305B 310A 309B 305C 308C 308A 305C 305B...
  • Page 127 EXPLODED VIEW DISPENSER PART 278A 277A 278C 402C 278B 276A 275A 278F 278G 278E 405A 275D 278D 275C 276B 275B 280D 401C 280E 501A 279D 280F 279C 279E 279B 281A 280C 280G 280B 279A - 127 -...

  • Page 128: Replacement Parts List

    JUL., 2004 Printed in Korea P/No. 3828JD8696S...

This manual is also suitable for:

Gr-p257Gr-l257niGr-l217Gr-l257Gr-c257Gr-p217 ... Show all

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