SERVICE MANUAL - Chuck Grimmett

1 CAUTIONBEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUALLRFC25750 COLOR COLOR: WESTERN BLACK :LRFC25750 STLRFC21755 SBLRFC21755ST STAINLESS-STEELLRFC21755 TTSAFETY PRECAUTIONS .. 3 PARTS IDENTIFICATION .. 5-6 DOOR .. 5 FAN AND FAN 6 DEFROST CONTROL 6 LAMP .. 6 CONTROL BOX-REFRIGERATOR .. 6 MULTI DUCT .. 7 OLP (OVERLOAD PROTECTOR).. 8TO REMOVE THE COVER PTC ..8 CIRCUIT 10-15 COMPRESSOR AND ELECTRIC COMPONENTS .. 10 PTC AND OLP .. 11 OTHER ELECTRICAL COMPONENTS .. 12 SERVICE DIAGNOSIS 13 REFRIGERATION CYCLE .. 14-15 OPERATION PRINCIPLE & REPAIR METHOD OF ICEMAKER.

2 16-19 DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM .. 20-38 EXPLODED VIEW & REPLACEMENT PARTS LIST .. 39-CONTENTS- 2 -Please read the following instructions before servicing Check the refrigerator for current To prevent electric shock, unplug before Always check line voltage and Use standard electrical Don't touch metal products in the freezer with wethands. This may cause Prevent water from spiling onto electric elements or themachine Close the top door before opening the bottom , you might hit your head when you stand When tilting the refrigerator, remove any materials onthe refrigerator, especially the thin plates (ex. glassshelf or books.)

3 9. When servicing the evaporator, wear cotton is to prevent injuries from the sharp SERVICE on the refrigerator should be performed by aqualified technician. Sealed system repair must beperformed by a CFC certified PRECAUTIONS21 cu. ft. / 25 cu. SPECIFICATIONS- 3 -ITEMSSPECIFICATIONSDOOR DESIGNSide RoundedDIMENSIONS (inches)35 3/4X 30 X 69 3/4(WXDXH) 3/4X 34 1/4X 69 3/4(WXDXH) WEIGHT (pounds)278 ( ) 302 ( ) COOLING SYSTEMFan CoolingTEMPERATURE CONTROLM icom ControlFull AutomaticDEFROSTING SYSTEMH eater DefrostDOOR FINISHE mbossed Metal, VCM, StainlessHANDLE TYPEBarINNER CASEABS ResinINSULATIONP olyurethane FoamITEMSSPECIFICATIONSVEGETABLE TRAYO paque Drawer TypeCOMPRESSORPTC Starting TypeEVAPORATORFin Tube TypeCONDENSERWire CondenserREFRIGERANTR-134a (115 g)LUBRICATING OILF reol @ 10G (310 cc)DEFROSTING DEVICESHEATH HEATERLAMPREFRIGERATOR60 W (2EA)FREEZER40 W (1EA)2.

4 PARTS IDENTIFICATION- 4 -Digital SensorControlRefrigerator LightShelvesOptibin CrisperKeeps fruits and vegetable fresh and crispCustomcube IcemakerGlide N ServeIce BinDurabaseDividerPull out DrawerFreezer Door Rack(Tilting)Design-A-DoorDesign-A-DoorW ine HolderDairy BinEgg BoxDesign-A-Door3-1 DOOR Refrigerator Door1. Remove the hinge cover by pulling it upwards. 2. Loosen the hex head bolts attaching the upper hinge tothe body and lift the freezer Pull out the door gasket to remove from the door foamassembly. Freezer Door1. Loosen the hex head bolts attaching the lower hinge tothe body to remove the refrigerator door Pull out the door gasket to remove from the door DISASSEMBLY- 5 -HINGEHINGE COVERF igure 1 GASKETF igure 2 LOWER HINGEBOLTF igure 33-2 FAN AND FAN MOTOR1.

5 Remove the freezer shelf. (If your refrigerator has anicemaker, remove the icemaker first)2. Remove the grille by pulling it out and by loosening Remove the Fan Motor assembly by loosening 2 screwsand disassemble the Pull out the fan and separate the Fan Motor and DEFROST CONTROL ASSEMBLYD efrost Control assembly consists of Defrost Sensor andFUSE Defrost Sensor works to defrost automatically. It isattached to the metal side of the Evaporator and senses itstemperature. At 72 C, it turns the Defrost Heater is a safety device for preventing over-heating ofthe Heater when Pull out the grille assembly. (Figure 6)2. Separate the connector with the Defrost Controlassembly and replace the Defrost Control assemblyafter cutting the Tie Wrap.

6 (Figure 7)3-4 LAMP3-4-1 Refrigerator Compartment Lamp1. Unplug the power cord from the Remove refrigerator Release the hooks on both ends of the lamp shield andpull the shield downward to remove Turn the lamp Assemble in reverse order of disassembly. Replacementbulb must be the same specification as the original (Max. 60 W2EA).3-4-2 Freezer Compartment Lamp1. Unplug refrigerator or disconnect Reach behind light shield to remove Replace bulb with a 40-watt appliance Plug in refrigerator or reconnect CONTROL BOX-REFRIGERATOR1. First, remove all shelves in the refrigerator, than removethe Refrigerator control Box by loosening 2 Remove the Refrigerator Control Box by pulling Disconnect the lead wire on the right position andseparate the lamp MULTI DUCT1.

7 Remove an upper andlower Cap by using a flatscrewdriver, and loosen 3screws. (Figure 11)2. Disconnect the lead wireon the bottom 6 -BRACKETMOTORGRILLEFAN MOTORFANF igure 5 GRILLE ASSEMBLYF igure 6 DEFROST-CONTROLASSEMBLYF igure 7 Figure 8 Figure 9 CONTROL BOXCOVER LAMPF igure 10 Figure 114-1 COMPRESSOR4-1-1 RoleThe compressor intakes low temperature and low pressuregas from the evaporator of the refrigerator and compressesthis gas to high-temperature and high-pressure gas. It thendelivers the gas to the CompositionThe compressor includes overload protection. The PTCstarter and OLP (overload protector) are attached to theoutside of the compressor.

8 Since the compressor ismanufactured to tolerances of 1 micron and is hermeticallysealed in a dust and moisture-free environment, useextreme caution when repairing Note for Usage(1) Be careful not to allow over-voltage and over-current.(2) If compressor is dropped or handled carelessly, pooroperation and noise may result.(3) Use proper electric components appropriate to theParticular Compressor in your product.(4) Keep Compressor the Compressor gets wet (in the rain or a dampenvironment) and rust forms in the pin of the HermeticTerminal, poor operation and contact may result.(5) When replacing the Compressor, be careful that dust,humidity, and soldering flux don t contaminate the insideof the compressor.

9 Dust, humidity, and solder fluxcontaminate the cylinder and may cause noise,improper operation or even cause it to lock PTC-STARTER4-2-1 Composition of PTC-Starter(1) PTC (Positive Temperature Coefficient) is a no-contactsemiconductor starting device which uses ceramicmaterial consisting of BaTiO3.(2) The higher the temperature is, the higher the resistancevalue. These features are used as a starting device forthe Role of PTC-Starter(1) The PTC is attached to the Sealed Compressor and isused for starting the Motor.(2) The compressor is a single-phase induction motor. Durign the starting operation, the PTC allows currentflow to both the start winding and main PTC-Applied Circuit Diagram Starting Method for the Motor4-2-4 Motor Restarting and PTC Cooling(1) It requires approximately 5 minutes for the pressure toequalize before the compressor can restart.

10 (2) The PTC device generates heat during , it must be allowed to cool before thecompressor can Relation of PTC-Starter and OLP(1) If the compressor attempts to restart before the PTCdevice is cooled, the PTC device will allow current toflow only to the main winding.(2) The OLP will open because of the over currentcondition. This same process will continue (3 to 5times) when the compressor attempts to restart untilthe PTC device has cooled. The correct OLP must beproperly attached to prevent damage to may appear physically identical but could havedifferent electrical ratings. Replace parts by partnumber and model number. Using an incorrect partcould result in damage to the product, fire, injury, orpossibly Note for Using the PTC-Starter(1) Be careful not to allow over-voltage and over-current.