Daewoo FRN-U20DB series Page 32 Service Manual Download

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5-1. Power Circuit Diagram

5. CIRCUIT OPERATION

- Basic Model

5Vdc

14.5Vdc

12Vdc

310Vac

230Vdc

Voltage

CE6

CE4

CE3

CE1

MC1

Parts

- Dispenser Model

※

Voltage of every part

※

Caution :

Since high voltage (DC310V) is maintained at the power terminal, please take a measure after more

than 3minutes have passed after removing power cords in the abnormal operation of a circuit.

Downloaded from Fridge-Manual.com Manuals

Summary of Contents for FRN-U20DB series

Page 1: ...e without notice in the parts list So if you need the latest parts information please refer to PPL Parts Price List in Service Information Center FRN U20IB FRS U20IB FRN U20DB FRN U20EB FRS U20DB FRS...

Page 2: ...4 Dispenser Solenoid Valve 48 8 5 Main PCB 49 8 6 Ice Maker 51 9 TROUBLE DIAGNOSIS 9 1 Power Failure 53 9 2 Freezer Compartment 54 9 3 Refrigerator Compartment 60 9 4 Operation Noise of Refrigerator...

Page 3: ...ok is correctly engaged Remove dust and foreign materials from the housing and connecting parts 8 Do not fray damage machine heavily bend pull out or twist the power cord 9 Please check the evidence o...

Page 4: ...3 2 1 External Size 2 EXTERNAL VIEWS FRS N U20IB Downloaded from Fridge Manual com Manuals...

Page 5: ...4 FRS N U20DB EB Downloaded from Fridge Manual com Manuals...

Page 6: ...5 FRS N U20FB GB Downloaded from Fridge Manual com Manuals...

Page 7: ...e Egg case 4 Freezer shelf 8 Chilled case 3 Ice tray 7 Refrigerator light 2 Freezer pocket 6 Dairy pocket 1 Freezer light Refrigerator Compartment Freezer Compartment 1 2 4 3 5 7 8 9 10 11 12 6 2 2 Na...

Page 8: ...lf 5 Freezer pocket 10 Movable Egg case 4 Freezer shelf 9 Wine Rack 3 Water Ice Dispenser 8 Refrigerator light 2 Freezer light Refrigerator Compartment Freezer Compartment 1 2 4 3 6 8 9 10 12 13 7 5 F...

Page 9: ...8 Freezer Compartment Refrigerator Compartment 2 3 Cold Air Circulation Downloaded from Fridge Manual com Manuals...

Page 10: ...ezer 337 Li 361 Li Refrigerator 903 mm x 734 5mm x 1790 mm 104kg 339 Li 198 Li 537 Li FRS N U20IB External Dimension Width x Depth x Height Weight 334 Li Refrigerator 170 Li Freezer 504 Li Total ISO S...

Page 11: ...10A 77 Fuse Temp Defrost PBN 38 F Sensor D Sensor D E F O R E S T AC220V 5W Water Pipe Heater AC220V 5W Dispenser Heater AC220V 8W Louver Heater H E A T E R SP201R 7DL SP201R 7DR SPF101B 2D SPF101B 1D...

Page 12: ...re mode 3 Initial mode by power input 3 Whenever pressing button setting is repeated in the order of Medium 3 Medium Max 4 Max 5 Min 1 Medium Min 2 INPUT CONTROL OBJECT CONTENTS REMARKS FRZ TEMP REF T...

Page 13: ...REEZER QUICK is ON After six month LED ON FILTER CHANGE ICON Dial ICE MAKER LOCK ICON Dial LOCK ICON Dial WATER CUBED ICE CRUSHED ICE ICON Always ON FUZZY DEODORIZER ICON Dial SUPER FREEZER SUPER REFR...

Page 14: ...OCK button again ICE MAKER LOCK icon is off WATER icon is on 8 RESET WATER FILTER button 1 The normal ICON OFF is on for 6 month after are first power input 2 After sic months icon is ON 3 How to rese...

Page 15: ...OFF Fan Delay 1 Time 5 minutes Comp ON and F fan R fan Heater OFF 4 2 Defrost Mode 2 The defrost mode start with the following conditions 1 Total operation time of comp becomes 6 8 10 24 hours Comp op...

Page 16: ...urs Total time is over 60 hours Comp operating time is over 6 hours End Defrosting start Comp operating time is over 2 hours Any error NO YES NO NO YES Total door open time is over 2 min YES YES YES Y...

Page 17: ...ter OFF Pause Fan Delay Heater Defrosting 2 How to start 1 Push REF TEMP button 5 times while pushing FRZ TEMP button simultaneously FRS U20IA 2 In LOCK mode push REFRIGERATOR SET button 5 times while...

Page 18: ...ON OFF For 10 minutes after sensing door open the lights turn off automatically through door close is not sensed 2 Control of freezer compartment lights F Light turn ON OFF by F door switch ON OFF For...

Page 19: ...CONTROL OBJECT CONTENTS REMARKS 1 FRZ TEMP 2 Door Switch Comp F R Fan Heater 4 8 Demonstration 1 Start Push ICE WATER button 5 times while pushing FREEZER SET button simultaneously 2 Control 1 All oth...

Page 20: ...weak ref cut J1 or J18 to down the standard resistance by 1 5deg 2K R38 In case of weak ref cut J2 or J19 to down the standard resistance by 1 5deg 2K 4 9 Compensation of R sensor ON OFF Point FRS N...

Page 21: ...play mode REF LED 1 is on and off twice Forced defrost mode for A S REF LED 1 is on Full Down mode REF LED 1 is on and off EEPROM defective REF LED 2 is on and off Return after defrosting defective RE...

Page 22: ...Control Deletion of function related door switch sensing If door switch open close is sensed the error is terminated automatically 6 Cycle error Cause in case comp works for over 3 hours when D senso...

Page 23: ...time 2 It stops automatically in 4 minutes from the start 3 All the error Codes are reset if they turn to be normal 4 Error code INPUT CONTROL OBJECT CONTENTS REMARKS Temperature Control Buttons 88 Di...

Page 24: ...asure the voltage of A part on the Main PCB If the voltage is 0 5V 4 5V it is normal If the voltage is 0V short or 5V disconnected change the RT sensor on the Main PCB How to reset If RT sensor is nor...

Page 25: ...ply doesn t go up Check the I sensor or water supply line 12 ES error MICRO switch error Cause When it senses 1min continuously Check the MICRO switch of the dispenser 14 Eu error Cause Switch which s...

Page 26: ...PUT CONTROL OBJECT CONTENTS REMARKS Each button Resistance of R sensor Mid ON OFF Point WATER ICE ICE MAKER LOCK 5 times Ice maker test WATER ICE RESET WATER FILTER 5times EEPROM clear FREEZER SET SUP...

Page 27: ...ST switch under the Icemaker for more than 1 second and test starts Test mode starts from ice separating mode In case test switch has an error of short test is done only once START Ice making mode Ice...

Page 28: ...to Ice making mode Ice separating and water supply Modes stop 5 Crusher Function It stops operation when freezer door is open It operates if freezer door is closed 2 Ice making mode START 130 min pass...

Page 29: ...switch error 2 The rotation of motor is sensed at each zone 3 In case of level switch error ice separation is done by time 4 If ice separating motor has error the mode stop 4 Water supply mode START...

Page 30: ...spenser switch WATER ICE Button ICE MAKER LOCK Button Freezer Door Switch Dispenser Lamp Crusher Motor Flap Solenoid Crusher Solenoid Dispenser Water Valve 1 Initial mode water Mode change Water Cubed...

Page 31: ...rushed Ice Cubed Ice Water Delay time A 500ms B 500ms C 2 0s D 5 0s D P SW Gear Motor D P Lamp D P S V Flap D A A C D P SW Cube S V D P S V Flap Gear Motor D P Lamp A C A A B D D P Lamp D P SW Water S...

Page 32: ...1 MC1 E D C B A Parts A Dispenser Model B D C E A B C D E Voltage of every part Caution Since high voltage DC310V is maintained at the power terminal please take a measure after more than 3minutes hav...

Page 33: ...4 05 Resistance High OFF Mid OFF Working Point D sensor 1 It senses return point of defrosting heater 2 How it works 13 Working Temp 3 08V 22 56 Return point of defrosting heater Sensing Voltage Resis...

Page 34: ...33 Low ON 2 72V 2 83V Sensing Voltage 24 76 24 05 Resistance High OFF Mid OFF Working Point D sensor C 1 It senses return point of defrosting heater 2 How it works 13 Working Temp 3 08V 22 56 Return...

Page 35: ...V 5 5 0V Relay 5 D Heater Relay 1 Control Mode Method IC7 IC ULN2004 Output pin 1 5 0V MICOM Port 1 0V MICOM Port Comp IC ULN2004 Output pin Control CONTENTS REMARKS 5 3 Relay Function Basic Model 2 H...

Page 36: ...ater Dispenser 6 0V 6 5 0V Relay 6 Water Ice 5 0V 5 5 0V Relay 5 Dispenser Solenoid 4 0V 4 5 0V Relay 4 Dispenser Lamp 9 0V 9 5 0V Relay 9 D Heater 8 0V 8 5 0V Relay 8 Geared Motor 10 0V 10 5 0V Relay...

Page 37: ...fan is determined by the PWM control using the software 2 Explanation for the operation TA7291P is the drive IC for the only DC motor and used for control of the fan motor One input and output is use...

Page 38: ...37 6 1 Wiring Diagram 6 DIAGRAM Basic Model Downloaded from Fridge Manual com Manuals...

Page 39: ...38 Dispenser Model Downloaded from Fridge Manual com Manuals...

Page 40: ...39 6 2 Circuit Diagram of Main PCB Basic Model Downloaded from Fridge Manual com Manuals...

Page 41: ...40 Downloaded from Fridge Manual com Manuals...

Page 42: ...41 Dispenser Model Downloaded from Fridge Manual com Manuals...

Page 43: ...42 Downloaded from Fridge Manual com Manuals...

Page 44: ...ensor Inner Controller F Door Switch R Door Switch R Door Switch Freezer Compartment Dispenser Model F Lamp F Fan Motor R Lamp R Fan Motor 7 2 Inner View Refrigerator Compartment Dispenser Model Refri...

Page 45: ...efrost Heater Water Pipe Evaporator Compressor Condenser Dryer Running Capacitor OLP PTC Water Valve Condenser Fan Motor Tray Drip Power cord 7 3 Evaporator 7 4 Machine Compartment Downloaded from Fri...

Page 46: ...ube A Pull forward Ice Maker Pull forward Hose Ice Maker Tube As Remove Water Hose Heater s 2P housing Check Hose Ice Maker Tube As 2 How to check Hose Ice Maker Tube As How to check CRITERION Measure...

Page 47: ...OOD 11 3 10 10 8 12 7 DEFECTIVE Change the Geared Motor PARTS HOW TO CHECK GOOD 145 8 133 156 DEFECTIVE Change the Cube Sol Valve Check resistance value of 2 terminals with a Multi Tester SPEC NAME DA...

Page 48: ...OD DEFECTIVE Change Micro Switch PARTS HOW TO CHECK SPEC NAME VP333A OD 8 VOLTAGE 125V 3A 8 3 Dispenser Micro Switch 1 Disassembling Procedure Check both terminals red circle with a Multi Tester Teste...

Page 49: ...193 236 DEFECTIVE 0 Change Sol Valve PARTS HOW TO CHECK GOOD 96 8 88 104 DEFECTIVE Change Flap Heater AS SPEC NAME SOL2003 01B VOLTAGE 220 240V 50Hz VOLTAGE DC 12V 1 5W Check resistance value of both...

Page 50: ...ltage of each electrical devices to from Mi com Check input output voltage of MICOM and IC7 Fan Power Controller 3 To check input output voltage of Fan 2 Input 5 Output Electric Current Fuse 4 To chec...

Page 51: ...cal devices to from Mi com Check input output voltage of MICOM and IC7 8 Fan Power Controller 3 To check input output voltage of Fan Electric Current Fuse 4 To check when each device does not work 250...

Page 52: ...r 1 Disassembling Procedure 2 7 Remove 2 screws on top front of ice maker Remove full ice sensing switch and level switch 4 9 Separate Ice Maker Assembly from Frame Ice Maker Remove 2 pin housing from...

Page 53: ...ce Sensing Switch Check resistance value of 2 terminals with a Multi Tester GOOD DEFECTIVE Change the switch Level Switch Check resistance value of 2 terminals with a Multi Tester GOOD DEFECTIVE Chang...

Page 54: ...chine compartment Start Power cord or Fuse is disconnected 1 st power of SMPS is on Main PCB Fuse is disconnected Voltage DC12V 14 5V 5V on Main PCB is OK Wire connection of F PCB is OK Check power Co...

Page 55: ...nt leak is found repair it N N Y Y Y N N Defrost Heater 192W 252 Left lower side of Evaporator 4th pipe from buttom OLP PTC is OK Does Comp work Any Error code on F PCB F C Motor works OK F C Motor is...

Page 56: ...reezer compartment 1 Removing and replacing Freezer parts Remove 2 screws of Ice Maker Remove the Housing of Ice Maker AS Right side Remove 4 screws of Geared Motor Remove the Housing of Geared Motor...

Page 57: ...cap on the F Louver A with a flat tip driver Removing and replacing Freezer parts Pull out smoothly the bracket F Lamp AS to remove Remove 3 screws of F Louver A Hold the end of F Louver A and pull f...

Page 58: ...ezer parts F Louver B Heater Housing D Sensor Housing 1st F Louver B Heater Housing 2nd None 3rd Defrost Heater Housing Temp Fuse Defrost Heater D Sensor Defrost Heater Temp Fuse Housing Downloaded fr...

Page 59: ...tance between heat appliances and refrigerator Y N N 9 2 2 Ice Formation on F Louver Dews are formed on the gasket surface inside F compartment Gasket has a gap between cabinet Door is hanged down Doo...

Page 60: ...iver Into a gap of door switch to pull forward Disconnect the housing and change the switch for a new one 9 2 3 Disconnection breaking of Freezer Lights Wires Freezer light filament is disconnected or...

Page 61: ...nector Y Y N N 9 3 1 Refrigeration failure Foods does not get cool or cold soon Any error mode on F PCB R Motor works OK R Motor is OK Wiring connection Is OK R Sensor is OK normal Freezer compartment...

Page 62: ...tch is OK 9 3 2 Disconnection Breaking of Refrigerator Lights Wires Change of R Lights Change of F Door Switch Follow the reverse order of disassembling after changing the light Insert a flat tip scre...

Page 63: ...compartment Repair and change R motor Y N Y Y Y N N N N Explain not to open doors too long Y N N N Y 9 3 3 Dews on Refrigerator Compartment Dews are formed on the gasket inside R compartment Gasket ha...

Page 64: ...Change the R sensor Y N N Y Check the R sensor connection Check the connector to Main PCB N Y Refer to Repair Change of Check Valve Y 9 3 4 Excessive Refrigeration of Vegetable Case Refrigerator temp...

Page 65: ...of Check Valve Flap and insert a finger to the valve frame to hold out Removing of Check Valve Remove screws of light cover Hold the bottom of cover and pull forward to remove Disconnect light housin...

Page 66: ...is somewhat normal because it works like a heart to circulate the refrigerant in the pipes during the refrigerator operation Rattling or metallic touch sound of motor piston of comp can be heard when...

Page 67: ...rs Remarks Water flowing sound hiss or sizzling sound can make while refrigerant in the pipes is changing from liquid to gas state when comp starts or stops It is normal to the refrigerator 9 4 2 Refr...

Page 68: ...mbling Sound of Evaporator 1 2 2 When such a sound is made attach a absorber on the tube including 2 welding points Attach a absorber on point accumulator 1 Check whether evaporator is fastened tight...

Page 69: ...N Y Set it right not to touch Y N Set it right not to move Y N Change the motor assembly N Y Explain to the customers how fan is working to circulate cold air in the compartments 9 4 3 Fan Noise Fan i...

Page 70: ...r 1 Check if fan motor frame of the assembly is fastened tightly with screws to the liner wall Unless it is tight vibration of shaking can make 1 Check if sealing sponge on the insulator touches the f...

Page 71: ...the pipe Start Separate the touching pipes if any N Y Apply cushion material between Comp base and Tray drip Y N Move or change the points of vibration absorber rubbers on the pipes to reduce the sha...

Page 72: ...PCB is OK N Repair the defective connection Y Door switch itself is OK N Change the switch N Y Check it up Door switch is pushed well Y Attach a thin pad on the door liner or change the door assembly...

Page 73: ...r refrigerant manifold gauge electronic scales punching off flier gas welding machine Weigh and control the bombe in a vacuum conditions with electronic scales and charge through compressor inlet Proc...

Page 74: ...and injecting refrigerant Replacement of drier 1 Remove retained refrigerant more than 5 minutes after turning off a refrigerator If not oil will leak inside 2 Remove retained refrigerant by cutting f...

Page 75: ...r When replacing a compressor Weld and parts by blowing nitrogen to the low pressure side Note For other parts nitrogen blowing is not necessary because it does not produce oxidized scales inside pipe...

Page 76: ...nt charged into the bombe by subtracting the weight of an evacuated bombe 4 Refrigerant charging Compressor Evaporator Dryer Condenser Vaccum Pump Hot Pipe Blue Yellow Red High Pressure Low Pressure K...

Page 77: ...t in each cycle 10 4 Standard Regulations for Heavy Repair 1 Observe the safety precautions for gas handling 2 Use JIG or wet towel in order to prevent electric wires from burning during welding In or...

Page 78: ...ipe F R Evaporator Condenser I Pipe Accumulator Suction Pipe Dryer Capi Tube Pipe Suc Conn Pipe Conn B Compressor Flow of Refrigeration Cycle Compressor Pipe Conn B Wire Con Pipe Hot Pipe Dryer Capill...

Page 79: ...34 5mm X 1790mm Find a suitable place to install Sufficient space from refrigerator back to the wall for free air ventilation Avoid direct sunlight Once the installation place is ready follow the inst...

Page 80: ...ckwise Disconnect the harness wires 4 Lift up the front of hinge to remove After the hinge is removed the door can fall down forward Be careful 5 Be careful not to damage the water line when removing...

Page 81: ...of door 4 Turn the hinge fastener tightly to The end Connect harness wire and screw ground wire 5 Insert the water tube far into the coupling Replacing Refrigerator Door 1 Insert the bottom hole of r...

Page 82: ...frigerator is uneven freezer and refrigerator doors look unbalanced Insert a screw driver flat tip into a groove of the right wheel bottom of refrigerator and turn it clockwise until the door is balan...

Page 83: ...once every 6months When attaching the filter place it for easy access removing replacing 6 After installation of refrigerator and water line system select WATER on your control panel and press it for...

Page 84: ...l to follow the direction of the nut 3 Insert the Water Tube into the top of Water Valve turn the nut clockwise to fasten it The Water valve is to the right of the motor 4 Check for any bent tubes or...

Page 85: ...84 11 5 Dispenser Water Flow Downloaded from Fridge Manual com Manuals...

Page 86: ...200 GUIDE CAB W TUBE A AS FRU 541D 1 1 1 1 16 3011444100 COVER GUIDE CAB W T A HIPS 1 1 1 1 17 3011202000 CLAMP WATER TUBE A PA 66 5N 2 2 2 2 18 3019974800 S PAER FILTER WATER AS FR S660CW 1 1 1 1 19...

Page 87: ...XTURE MOTR PP 1 1 1 1 1 46 3015916100 MOTOR C FAN AS DC 2213DWCA 3 1 1 1 1 1 47 3018500300 M BELL B PP 1 1 1 1 1 48 3018500200 M BELL A PP 1 1 1 1 1 49 3011834700 FAN ABS OD3 17XD150 1 1 1 1 1 50 3011...

Page 88: ...R AS ABS 1 1 1 1 1 79 3011114630 CASE VEGETB B AS NANO 1 1 1 1 1 80 3018701800 DEO ANTI AS W40XT5XL40 1 1 1 1 1 81 3011445900 COVER RETURN DUCT PP 1 1 1 1 1 82 3011446700 COVER VEGETB CASE B GPPS 1 1...

Page 89: ...USHER R ABS 1 1 1 1 118 3011115202 CASE I CRUSHER AS FRU 541D 1 1 1 1 3001401701 COVER F FAN AS FRU 571I 1 3001401711 COVER F FAN AS FRU 541D 1 1 1 1 120 3014531900 PLATE F LAMP SGCC T0 8 1 1 1 1 1 12...

Page 90: ...E 4X14 S18C 2 2 2 2 2 144 3017903702 SOCKET DISP LAMP AS 250V 1A 14BASE 1 1 1 1 3013600020 240V 15W 3013600050 110V 15W 146 3010544000 BOX DISPNS ICE SHUT AS FRU 541D 1 1 1 1 147 3011494700 COVER DISP...

Page 91: ...3019026900 POCKET R S FRU 571I 2 3000067700 ASSY R DR FRU 547F SUS 1 1 3000067710 ASSY R DR FRU 571I SUS 1 1 1 161 1 3012318900 GASKET R DR AS PVC 1 1 1 1 1 161 2 3012319300 GASKET H BAR B AS PVC 1 1...

Page 92: ...U 3956145250 350VAC 5 3016401170 265RHB S330 3018129600 2 Power Cord Description Part Code Description Part Code 91 KP 550 China 3011301070 KP 550 Australia 3011301080 Compressor Capacitor Run Switch...

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