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8-2-6 Refrigeration Compartment Stepping Motor Damper Circuit

* The circuit shown below is the damper circuit to regulate the refrigerator temperature.

8-2-7 Temperature compensation & overcooling/undercooling compensation circuit

Table of temperature compensation by cutting JUMP WIRE
to easy SVC temperature adjustments
+1deg, +1deg, -1deg, -1deg.

Four oprion are available for R Compensations by CUTTING
JUMP WIRE.

Example 1) CUTTING JCR1 and JCR2: R +2 deg
compensation
Example 2) CUTTING JCR1 and JCR3: no compensation in
R compartment.
Example 3) CUTTING

JCR1, JCR2 and JCR3:

compensation of temp +1deg +1deg = +1deg.

OPTION

CUTTING

Remark

R +1.0 deg compensation

R +1.0 deg compensation

R -1.0 deg compensation

R -1.0 deg compensation

JCR1

JCR2

JCR3

JCR4

Warmer

Colder

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Содержание LFC20760SB

Страница 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL REFRIGERATOR SERVICE MANUAL MODELS LFC20760SW 04 LFC20760SB 04 LFC20760ST 04 ...

Страница 2: ... Number Rev 01 SVC Improvement opening door freezer change design of rails Rev 02 Change Cover Lower Case PCB and Rail Rev 03 Change compressor base compressor Rev 04 Valve inclined in order to improve water house connection ...

Страница 3: ...FICATION 3 DISASSEMBLY 3 1 Remove Refrigerator Door 3 2 Replace Refrigerator Door 3 3 Remove Door Handle 3 4 Door Gasket Removal 3 5 Door Gasker Replacement 3 6 Door Alignment 3 7 Pull Out Drawer 3 8 Fan and fan motor 3 9 Defrost control assembly 3 10 Lamp 3 11 Control Box Refrigerator 3 12 Multi duct 4 ADJUSTMENT 4 1 Compressor 4 2 PTC Starter 4 3 OLP overload protector 4 4 To remove the cover PT...

Страница 4: ...es 1 40W Blue Egg Bank REFRIGERATOR Case Material Door Material Handle Type Display Graphic Tray Drawer F L Lamp Shelf Ice Tray Bank Basket Quantity Condenser Lubricanting Oil ID Ø0 75 Compressor Fin Tube Type Wire Condenser Polyol Ester ISO 10 220 10 cc Cooling System Rated Rating Climate class 1B 1EA MOLECULAR SIEVE XH 7 Defrost Cycle Desfrosting Device Evaporator Capillary Tube First Defrost Te...

Страница 5: ...w The locations of the features shown below may not match your model on some models A B C G H I J E F K D L M N O P A L Digital Sensor Control Filter Inside Durabase Divider Egg Box Refrigerator Door Rack Freezer Light Pull out Drawer B C D F E G H I J K M N O P Ice Tray Optibin Crisper Keeps fruits and vegetable fresh and crisper Chef Fresh Snack Pan Can Dispenser Shelves Refrigerator Light Custo...

Страница 6: ...g hinge screws 3 to secure it Make sure the gasket on the door is flush against the cabinet and is not folded Support the door on the handle side while securing And make sure the door is straight and the gap between the doors is even across the front Install the ground screw 6 Connect the door switch wire 2 Tighten the cover screw 1 Left Door Lower the door onto the middle hinge pin 5 Make sure th...

Страница 7: ...bracket clip and door frame 2 Insert a flat tip screwdriver into seam between gasket bracket and door frame and pry back until clips snaps out 3 Continue prying back along seam until all clips snap out 3 Remove gasket Pull gasket free from gasket channel on the three remaining sides of door Gasket Door Bracket Clip Frame Flat Tip Screwdriver Gasket Bracket Loosen the set screws with the 3 32 allen...

Страница 8: ...e Correct Incorrect 2 Insert gasket into channel 1 Snap gasket assembly into the door bracket Inserting the Gasket Assembly into the Bracket Door 2 Press gasket into channels on the three remaining sides of door Correct Incorrect 3 Replace door frame cover Starting at top of cover and working down snap cover back into door 3 6 DOOR ALIGNMENT If the space between your doors is uneven follow the ins...

Страница 9: ... screws of the rail on both sides With both hands hold both sides of the door and pull it up to separate it from the rails C A U T I O N When laying down the drawer be careful not to damage the floor or hurt your feet with the sharp edges on hinge side C A U T I O N When removing drawer door do not hold it by the handle Door could fall down and you may be injured grasp door with both hands as pict...

Страница 10: ... tighten the screws Rail tabes Door Supports Screws Make sure you have a right rail cover for each side Right Rail cover Left Rail cover Align the top holes of the rail cover with the top holes of the door supports to assemble the rail cover Verify the hole s assembly With the rails pulled out to full extension insert the durabase in the rail assembly Durabase W A R N I N G To prevent accidental c...

Страница 11: ...igure 2 3 10 LAMP 3 10 1 Refrigerator Compartment Lamp 1 Unplug the power cord from the outlet 2 Remove refrigerator shelves 3 Release the hooks on both ends of the lamp shield and pull the shield downward to remove it 4 Turn the lamp counterclockwise 5 Assembly is the reverse of disassembly Replacement bulb must be the same specification as the original Max 40 W2EA 3 10 2 Freezer Compartment Lamp...

Страница 12: ...oth the start winding and main winding 4 2 3 PTC Applied Circuit Diagram Starting Method for the Motor 4 2 4 Motor Restarting and PTC Cooling 1 It requires approximately 5 minutes for the pressure to equalize before the compressor can restart 2 The PTC device generates heat during operation Therefore it must be allowed to cool before the compressor can restart 4 2 5 Relation of PTC Starter and OLP...

Страница 13: ...of the OLP in any way 4 4 TO REMOVE THE COVER PTC 1 Remove the Cover Back M C 2 Disconnect two housing upper side of comp connected in 3 Loosen two screws on comp base 4 Use a L shaped flap tool to pry off the cover 5 Assembly in reverse order of disassembly 12 Part Customer part number Lot code date code 330 FBYY S1 BOX98 12345678 termination part number Electrical characteristics part number No ...

Страница 14: ...M I MAKER W VALVE BK V S W Cr RD PK 2 2 CAPACITOR PART CAPACITOR PART CON6 1 BL 2 1 RD BK 5 5 6 6 4 4 3 3 PTC STARTER Cs BL COMP ACCESSORIES POWER PK PINK YL YELLOW BK BLACK GN GREEN BN BROWN PWB PCB ASSEMBLY ICE MAKER WH WHITE BL FUSE M BL B A HEATER SHEATH BO RD 72 C nc BK OLP YL S GN PART PART S GN YL M COMP EARTH COMP EARTH GN GN BL PR F LAMP nc R LAMPS D C nc PR PURPLE BO BRIGHT ORANGE MEZ481...

Страница 15: ... 10 Remove PTC Starter from compressor and measure voltage between T erminal C of compressor and terminal 5 or 6 of PTC Check resistance of two terminals in PTC Starter Check resistance of two terminals in OLP Check the power supply under load Compressor attempting to re start after being off for 5 minutes Check resistance of PTC Starter Check OLP Check starting state Check resistance of motor com...

Страница 16: ...th a T ester Figure 1 Observation value is 115V 60Hz 6 8 20 The resistance value is 0 short or open Check another electric component Replace OLP Replace PTC Starter Figure 1 Figure 2 Normal operation of compressor is impossible or poor Separate OLP from compressor and check resistance value between two terminals of OLP whit a tester Figure 2 ...

Страница 17: ...apacity Replace indicated component Advise customer that the Power supply needs to be checked by an electrician Replace indicated component Cause Check voltage at starting devices Check current flowing in sub coil of Compressor Check rating of OLP Fan motor doesn t run Heavy frost buildup on EVAPORATOR Wire is open or shorted Coil is shorted or open Open Open Replace Defrost Heater Replace indicat...

Страница 18: ... high Are any unnecessary objects placed Check if the Drip Tray is not firmly fixed Check if the cover of the compressor enclosure in the lower front side is taken out Check if the door gasket is dirty with an item like juice Check if the inside of the unit is dirty The unit smells of plastic Plug into the outlet Set the switch to ON Replace the fuse If the voltage is low correct the wiring Place ...

Страница 19: ...or don t in inlet only temperature The capillary tube is faulty cool normally WHOLE Freezer Flowing sound of refrigerant Equal to ambient Normal discharging of the CLOG compartment and is not heard and frost isn t temperature Refrigerant formed MOISTURE Cooling operation Flowing sound of refrigerant Lower than Cooling operation restarts CLOG stops periodically is not heard and frost melts ambient ...

Страница 20: ...ial Very Fast Inefficient Compressor Partial Restriction Complete Restriction Equalization Test Condenser Temperature None Very Fast Very Slow Very Slow Hotter than Normal Air Low Side Leak Loss of Change Compressor Not Pumping Cap Tube Sound Room Temperature Trace of Oil Undercharge Leak Yes No Faint Fast None to Weak The equalization test is trying to restart a compressor using a start kit after...

Страница 21: ...e Park Position Fill Test Mode Waits until water becomes cold after starting the Icemaking operation Runs MOTOR to drop ice from the tray into the ICE BIN Performs Icemaking Mode after supplying water by operating the SOLENOID in ICE VALVE To operate LINE and SERVICE press and hold the Cube Size button for 3 seconds The icemaking will run through 3 stages Harvest Fill Icemaking With the detect lev...

Страница 22: ...ed if it reaches start position again while Heater Motor are on at the same time A ice bin is full The EJECTOR stops heater off B ice bin is not full The EJECTOR rotates twice to open for ice NOTE If the EJECTOR does not rotate once within 5 minutes in status 2 separate heater control mode starts operating to prevent the EJECTOR from being constrained It is recommended that the user open for ice t...

Страница 23: ...r supply control panel ERROR indicators in table can be checked only in TEST mode STAGE ITEMS INDICATOR REMARKS 1 2 3 4 5 6 HEATER MOTOR HALL IC TRAY SOLENOID VALVE HALL IC LEVER Reset Five seconds after heater starts heater will go off if temperature recorded by sensor is 10 C 50 F or lever is in up position Five seconds after heater starts you can confirm that motor is moving You can confirm Hal...

Страница 24: ...er on again ICE PLUS function will be canceled 4 To activate these function you need to press the ICE PLUS key and the LED will turn ON This function will remain activated for 24 hrs The first three hours the compressor and ICE PLUS will be ON The next 21 hours the freezer will be controlled at the lowest temperature After 24 hours or if the ICE PLUS key is pressed again the freezer will return to...

Страница 25: ...und When the button on the front Display is pushed a Ding Dong sound is produced 8 1 7 Defrosting Removing Frost 1 defrosting starts each time when compressor running time reach 7 hours if any door hasn t been opened 2 In case of any door has been opened the defrosting period will start considering the next conditions If compressor running time is bigger than 7 hours when door is opened Defrosting...

Страница 26: ...ct Connecting wires on each sensor Snapping of defrost heater or Temperature fuse pull out of connector indicated minimum 2 hours after failure occurs Poor motor hooking to wires of fan contact of structures to fan snapping or short circuit of Lead wires Defect code signs Defect code signs 1 2 LED OFF LED ON RT sensor error LED check mode Poor of defrost All off All off All off All off All off All...

Страница 27: ... seconds Push ICE PLUS Key and ADJUST key of Freezer Temperature at the same time over 3 seconds in TEST MODE 1 Push ICE PLUS key and AJUST key of Freezer Temp At the same time over 3 seconds in TEST MODE 2 5 Every DISPLAY LED ON 1 COMP OFF 2 Freezer FAN OFF 3 STEPPING DAMPER CLOSE 4 Defrosting heater ON 5 DISPLAY LED 1 3 5 7 ON Reset if the temperature of the defrosting sensor is 46 F 8 C or more...

Страница 28: ... 12 Vdc and the MICOM and IC 5 Vdc The voltage for each part is as follows VA1 is a part for preventing over voltage and noise When high voltage is applied the inside elements are short circuited and broken resulting in blowout of the fuse in order to protect the elements of the secondary part of the TRANSFORMER PART VA 1 CE 3 CE 4 CE 5 VOLTAGE 115 Vac 12 Vdc 15 5 Vdc 5 V ...

Страница 29: ...ot work 8 2 3 Reset Circuit The RESET circuit allows all the functions to start at the initial conditions by initializing various parts including the RAM inside the MICOM IC1 when the power is initially supplied or the power supply to the MICOM is restored after a momentary power failure For the initial 10ms of power supply LOW voltage is applied to the MICOM RESET terminal During a normal operati...

Страница 30: ...Drive Open Door Detection Circuit 1 Load Drive Condition Check 29 LOAD TYPE COMP NO 14 NO 12 NO 11 NO 13 1V or below 12V DEFROSTING HEATER LAMP FRENCH DOOR HEATER 1 2 DEW HEATER Measurement Location IC6 Condition ON OFF ...

Страница 31: ...cutting Off the power supplied to driver inside the Fan Motor when it is necessary 2 This is a circuit to perform a temporary change of speed for the fan motor and applies DC voltage up to 7 5V 16V to motor 3 This circuit prevents over driving the fan motor by cutting off power applied to the fan motor in the lock of fan motor by sensing the operation RPM of the fan motor ...

Страница 32: ...ne room 1 This circuit makes standby power 0 by cutting off power supplied to Iss inside of the fan motor in the fan motor OFF 2 This circuit prevents over driving the fan motor by cutting off power applied to the fan motor in the lock of fan motor by sensing the operation RPM of the fan motor 31 ...

Страница 33: ... 0 5 s 2 63 kz Beep OFF 0 05 s 0 1 s 0 2 s 2 s 0 V 5 V 0 V 5 V 2 63 kz Ding 2 21 kz Dong A B Tone Ding Dong when the button on the display is pushed Alarm for open door beep beep beep REFRIGERATOR DOOR SWITCH FREEZER DOOR SWITCH Pin No 14 Refrigerator Door Pin No 15 Freezer Door Closed 5 V Open 0 V Freezer Refrigerator Door Measurement Location ...

Страница 34: ...ng Sensor POINT Voltage A B C 8 2 5 Temperature Sensor Circuit The upper CIRCUIT reads REFRIGERATOR temperature FREEZER Temperature and DEFROST SENSOR temperature for defrosting and the indoor temperature for compensating for the surrounding temperature into MICOM OPENING or SHORTstate of eachTEMPERATURE SENSOR are as follows RT Sensor POINT Voltage D ...

Страница 35: ...ng JUMP WIRE to easy SVC temperature adjustments 1deg 1deg 1deg 1deg Four oprion are available for R Compensations by CUTTING JUMP WIRE Example 1 CUTTING JCR1 and JCR2 R 2 deg compensation Example 2 CUTTING JCR1 and JCR3 no compensation in R compartment Example 3 CUTTING JCR1 JCR2 and JCR3 compensation of temp 1deg 1deg 1deg OPTION CUTTING Remark R 1 0 deg compensation R 1 0 deg compensation R 1 0...

Страница 36: ...n Circuit The circuit shown below determinates whether a function control key on the operation display is pushed It also turns on the corresponding function indication LED LED Module SEVEN SEGMENT DISPLAY MODULE The drive type is the scan type ...

Страница 37: ...ENSOR has a 5 common diference Measure the resistance of the SENSOR after leaving it for over 3 minutes in the measuring temperature This delay is necessary due to sensor response speed 20 C 15 C 10 C 5 C 0 C 5 C 10 C 15 C 20 C 25 C 30 C 40 C 50 C 22 3K 16 9K 13 0K 10 1K 7 8K 6 2K 4 9K 3 9K 3 1K 2 5K 2 0K 1 4K 0 8K 77K 60K 47 3K 38 4K 30K 24 1K 19 5K 15 9K 13K 11K 8 9K 6 2K 4 3K ...

Страница 38: ...C is poor Replace OLP PTC after compressor shuts off COMPRESSOR RELAY is Replace MAIN PWB don t press the KEY and poor wait THE CONNECTING WIRE Check the connection of the is poor black wire of the MAIN PWB CONNECTOR CON2 2 If refrigerant is leaking Measure the amount of frost Refrigerant leakage Replace the leaking part and sticking on EVAPORATOR replace any lost refrigerant and the surface tempe...

Страница 39: ...liner damaged Replace Door liner door is closed DEFROSTING is NO DEFROSTING 1 If HEATER emits heat USE TEST MODE3 HEATER disconnection Replace HEATER poor forced DEFROSTING TEMPERATURE FUSE Replace TEMPERATURE disconnection FUSE Connection is poor Check EVAPORATOR connection and wire of MAIN PWB CONNECTOR DEFROST SENSOR is poor Replace DEFROST SENSOR HEATER RELAY is poor Replace RY2 of MAIN PWB 2 ...

Страница 40: ...8 5 MAIN PWB ASSEMBLY AND PARTS LIST 8 5 1 Main PWB Assembly 39 ...

Страница 41: ...8 5 2 PWB Assembly Display and parts list 40 ...

Страница 42: ...8 6 PWB DIAGRAM 41 8 6 1 PWB Main Assembly Part 1 ...

Страница 43: ... 42 Part 2 ...

Страница 44: ...D 503C 409B 125D 120B 503E 282E 402A 271A 501F 501A 304A 411A 903D 610A 145B 158A 282B S01 301A 903E 128E 610A S01 128F 262H 406B 106A 305B 305C 305B 305C 103C 105F 405G 329A 319E 405C 404A 405F 405A 332A 135C S22 158E 418A 106A 409B 315A S38 43 328B 410G 105A 327A 318A 317A 309A 314A 307A 419B 307B 312A 310A 328A 412D 308A 323B 319A 319C 405B 405B 329C 420A ...

Страница 45: ...131A 136B 248E 248F 136A 145F 145C EV FREEZER PARTS CAUTION use the part number to order part not the position number 44 ...

Страница 46: ...28A 103E S24 142D 140B 103E 167B 154A 151A 151A 103E 155B 151C 140D S24 S24 140E 143E 140B 140D S24 S24 140E 143E 140B 140D S24 S24 140E 143E 140B EV REFRIGERATOR PARTS CAUTION use the part number to order part not the position number 45 ...

Страница 47: ...1A 212G 233G 233E 244A 212J 286A 286A 243A 243A S27 S27 243B 243B 262E 262E 233H 233F 244A 212J 249A 249E 250B 249J 621B 250A 205C 205B 200A 203A 201A 212J 212A 621C 250B 249B 249K 249F EV DOOR PARTS CAUTION use the part number to order part not the position number 46 241A 241B ...

Страница 48: ...S28 602A 600A 600C 622B S29 618A 616E 627A 623C EV WATER ICEMAKER PARTS CAUTION use the part number to order part not the position number 619C S31 47 ...

Страница 49: ...April 2010 MFL62526028 Rev 04 ...

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