Daewoo FRS-U20DD Series Service Manual Download

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5-1. Power Circuit Diagram

5. CIRCUIT OPERATION

5Vdc

14.5Vdc

12Vdc

310Vdc

230Vac

Voltage

CE6

CE4

CE3

CE1

MC1

Parts

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.

Summary of Contents for FRS-U20DD Series

Page 1: ...on Center http svc dwe co kr SEP 2008 Refrigerant Type R 134a FRS U20DD FRS U20ED FRN U20DD FRN U20ED FRN U20DD I FRN U20ED I FRS U20FD FRS U20GD FRN U20FD FRN U20GD FRN U20FD I FRN U20GD I Refrigeran...

Page 2: ...2...

Page 3: ...3 2 EXTERNAL VIEWS 2 1 External Size U20DF U20DG Series...

Page 4: ...4 2 2 External Size U20FF U20FG Series...

Page 5: ...shment Pocket option 6 Egg Case 1 Freezer Pocket 10 Refrigerator pocket 9 Dairy Pocket 4 Freezer Case 2 8 Vegetable Case 2 3 Freezer Case 1 7 Vegetable Case 1 2 Freezer Shelf Refrigerator Compartment...

Page 6: ...er Pipe Heater AC 220V 192W Defrost Heater H E A T E R R 134a 190g R 600a or R 134a Look for your rating label Refrigerant C Y C L E C O O L I N G R 600a 76g Quantity Fin Type Evaporator Fan Cooling S...

Page 7: ...ET SUPER FREEZER SUPER REFRIGERATOR DISPENSER SELECT FILTER RESET KEY LOCK FCP C LED After six month LED ON FILTER CHANGE ICON Dial KEY LOCK ICON Dial WATER CRUSHED ICE CUBED ICE ICE MAKER LOCK Dial S...

Page 8: ...ne more time 6 Dispenser button 1 Dispenser select function You can select water crushed ice or cubed ice by pressing the Dispenser button 2 Ice maker lock function If you don t want to produce ice cu...

Page 9: ...f Compressor does not run within 7 minutes F fan R fan Heater etc OFF Fan Delay After defrost when the first compressor turn on F Fan start to run after 5 minutes from compressor turn on 4 2 Defrost M...

Page 10: ...ours Total time is over 60 hours Comp operating time is over 6 hours End Defrosting start Comp operating time is over 2 hours Is there any error code NO YES NO NO YES Total door open time is over 2 mi...

Page 11: ...d off Compressor does not run within 7 minutes F fan R fan Heater etc OFF Fan Delay After defrost when the first compressor turn on F Fan start to run after 5 minutes from compressor turn on 4 3 Defro...

Page 12: ...ours Total time is over 60 hours Comp operating time is over 10 hours End Defrosting start Comp operating time is over 2 hours Is there any error code NO YES NO NO YES Total door open time is over 2 m...

Page 13: ...AN 13 V 13 V 13 V Voltage C FAN Condenser R FAN Refrigerator compartment F FAN Freezer compartment 4 5 Fan Motor Voltage of Control Mode Refer to the 5 4 Fan Function Heater Defrosting 1 Defrost heate...

Page 14: ...omatically through door close is not sensed 2 Control of freezer compartment lights F Light turn ON OFF by F door switch ON OFF For 10 minutes after sensing door open the lights turn off automatically...

Page 15: ...r electrical components are OFF except for F Fan R Fan 2 Fan Control Door opened Fan ON Door closed Fan OFF 3 How to exit 1 Under Demonstration mode Press and hold REF Set button and press Dispenser b...

Page 16: ...CT CONTENTS REMARKS Main PCB Resistance of R sensor 4 9 Temperature compensation Refrigeration compartment R R Sensor Sensor J2 R36 R37 R38 J1 Refer to the 5 2 Function of each sensor J1 J2 Location o...

Page 17: ...yed only if there is any it is skipped if no error 2 How to exit 1 Press Lock button 1 time 2 It exit automatically in 4 minutes after from the start 3 All the error Codes are reset if they turn to be...

Page 18: ...ection or short full down Check point Measure 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 M...

Page 19: ...5min after water supply 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...

Page 20: ...he Lock button Step 2 Press Super Freezer 5 times while pushing the Freezer button Step 3 Push Freezer button 6times Fi Lt display Step 4 Remaining time is display if dispenser button pressed ex 40 12...

Page 21: ...er is always ON if RT sensor has an error or RT is below 15 degree Heater is always ON for 60 minutes max Limit time if Flow sensor has an error 4 Water supply stand by Condition if ice is sensed full...

Page 22: ...ime of each zone used to verify level 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...

Page 23: ......

Page 24: ...7C 8C 9C 10C I S Over 41C 41C 31C 21C 15C Below 9C RT S 4 13 Dispenser Control Function INPUT CONTROL OBJECT CONTENTS REMARKS Dispenser switch Dispenser button ICE MAKER LOCK Button Freezer Door Swit...

Page 25: ...l Flow Timing Chart Crushed 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...

Page 26: ...Always Close On Magic Cool Zone Damper Refrigerator Fan 3 Damper heater control 1 Damper Open Damper Heater OFF 2 Damper Close Damper Heater ON 4 How to Check Error Mode 1 How to start Push Select bu...

Page 27: ...30Vac Voltage CE6 CE4 CE3 CE1 MC1 E D C B A Parts 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...

Page 28: ...7 7C Working Temp 2 96V 23 33 k ohm Low ON 2 72V 2 83V Sensing Voltage 24 76 k ohm 24 05 k ohm Resistance High OFF Mid OFF Working Point D sensor C 1 It senses return point of defrosting heater 2 How...

Page 29: ...0V Relay 3 H B Heater IC8 7 0V IC8 7 5 0V Relay 7 Water valve Dispenser 6 0V 6 5 0V Relay 6 Water valve Ice 5 0V 5 5 0V Relay 5 Dispenser Solenoid 4 0V 4 5 0V 9 0V 9 5 0V Relay 9 Defrost Heater 8 0V...

Page 30: ...to the 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...

Page 31: ...ure the Frequency Output Signal from Main PCB 122 Hz Initial Power connected Super FRZ Super REF Weak Cool 122 Hz Normal operation RT Sensor 35 85 Hz Frequency Output Signal CN 16 of Main PCB Normal o...

Page 32: ...32...

Page 33: ...ures are model dependent F Sensor Automatic Ice Maker Geared Motor R Sensor F Door Switch R Door Switch Freezer Compartment Front PCB Dispenser Button Home bar Door F Lamp F Fan Motor R Lamp R Fan Mot...

Page 34: ...st Heater Evaporator 7 3 Evaporator 7 4 Machine Compartment Below is the inverter compressor models Condenser Dryer Inverter controller Water Valve Condenser Fan Motor Tray Drip Power cord Compressor...

Page 35: ...ver Guide Cab W Tube 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...

Page 36: ...C CRITERION GOOD 11 3 ohm 10 10 8 12 7 ohm DEFECTIVE Change the Geared Motor PARTS HOW TO CHECK GOOD 145 ohm 8 133 156 ohm DEFECTIVE Change the Cube Sol Valve Check resistance value of 2 terminals wit...

Page 37: ...o Switch CRITERION GOOD 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...

Page 38: ...ERION Good 215 ohm 10 193 236 ohm 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...

Page 39: ...each device does not work 250V 3 15A Receive signal 5V from the MICOM Deliver signal 12V each electric device Check input output voltage of MICOM and IC7 When consumer claim about the refrigerator s t...

Page 40: ...shorten time in PCB checkup 1 time pushing is 1 minute To check when each device does not work 250V 3 15A Receive signal 5V from the MICOM Deliver signal 12V each electric device Check input output v...

Page 41: ...isassembling 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 ice senso...

Page 42: ...Check resistance between 2 terminals with tester GOOD 4 4 50 k ohm It depends on ambient temperature DEFECTIVE Change the sensor Full ice sensing switch Check the resistance between 2 terminals COM NO...

Page 43: ...use the frequency signal mode CN 05 P P Not applied N Auxiliary AC Connection It provides an auxiliary AC power connection that supplies energy for other devices like a lamp or other facilities CN 02...

Page 44: ...uency signal according to the relation described bellow Relation between Inverter frequency and compressor rotation 1 600 50 1 to 53 3 30 x Hz 53 4 to 150 hysteresis 105 to 111 hysteresis 130 to 132 h...

Page 45: ...to previous major failure Verify the Control Input Cable connection and measure the signal from the Main PCB No control signal input or bad connection Verify the AC Input Cable connection and measure...

Page 46: ...lloscope Hz c Output Signal Measure the output signal frequency with Oscilloscope Hz a AC Input Measure the AC input voltage with multi tester 5 Frequency mode connection Check point Inverter AC Input...

Page 47: ...of machine 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 po...

Page 48: ...Eva And if refrigerant leak is found repair it N N Y Y Y N N Defrost Heater 192W 252 ohm Left up side of Evaporator Inverter is OK Does Comp work Any Error code on F PCB F C Motor works OK F C Motor...

Page 49: ...helves and cases in Freezer 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 Hou...

Page 50: ...forward slowly Remove the screw cap on the F Louver A with a flat tip driver Removing and replacing Freezer parts Remove 3 screws of F Louver A Hold the end of F Louver A and pull forward slowly Remov...

Page 51: ...51 Removing and replacing Freezer parts F Fan Motor connector D Sensor connector Defrost Heater connector Defrost Heater Temp Fuse connector Temp Fuse D Sensor...

Page 52: ...Y N N Make enough distance between heat appliances and refrigerator Y 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 Doo...

Page 53: ...t a flat tip screw driver 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 filame...

Page 54: ...or and check connector 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 Fre...

Page 55: ...nection of R door switch is OK 9 3 2 Disconnection Breaking of Refrigerator Lights Wires Change of F Lights Change of F Door Switch Follow the reverse order of disassembling after changing the light I...

Page 56: ...efore storing in the 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...

Page 57: ...ange the R check valve 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 Super cooling of Vegetable Case Refri...

Page 58: ...emove Lift up a piece 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 Di...

Page 59: ...arks Compressor sound 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 c...

Page 60: ...the users or customers 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 re...

Page 61: ...tor 3 Shaking or trembling 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 3 accumulator 1 Check whether evapora...

Page 62: ...Start Change the fan 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...

Page 63: ...Fastening of Fan Motor 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 in...

Page 64: ...a much bent point on 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 pi...

Page 65: ...r insertion to Main 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 chang...

Page 66: ...ty Bombe mass cylinder 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...

Page 67: ...when repairing pipes 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 ref...

Page 68: ...ter assembling a drier When replacing a compressor Weld 3 and 4 parts by blowing nitrogen to the low pressure side Note For other parts nitrogen blowing is not necessary because it does not produce ox...

Page 69: ...e the weight of refrigerant 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 Hig...

Page 70: ...ork 6 Pipe arrangement 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...

Page 71: ...r Welding Ag 35 Hot Pipe 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...

Page 72: ...pth Height 903mm X 730 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 r...

Page 73: ...hinge bolt counterclockwise 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 wate...

Page 74: ...front to the top hole 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...

Page 75: ...floor beneath the refrigerator 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 un...

Page 76: ...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 2 3 minutes to sup...

Page 77: ...Water tube Be careful 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 fo...

Page 78: ...78 11 5 Dispenser Water Flow...

Page 79: ...TUBE A AS FRU 541D 1 1 1 16 3011444100 COVER GUIDE CAB W T A HIPS 1 1 1 17 3011202000 CLAMP WATER TUBE A PA 66 5N 2 2 2 18 3019974800 S PAER FILTER WATER AS FR S660CW 1 1 1 19 3012924003 HINGE U R AS...

Page 80: ...1 43 3015402300 VALVE WATER AS 220 240V 50 60Hz 1 1 1 44 3014461510 PIPE WICON AS TSW OD4 76XT0 7 1 1 1 45 3018500510 M BELL AS FRU 571I PP NATURAL 1 1 1 45 1 3015916100 MOTOR C FAN D4612AAA22 1 1 1 4...

Page 81: ...529811 GUIDE CASE C R AS HIPS 1 1 x x 76 3011114780 CASE VEGETB C AS FRU 54AD 1 1 x x 80 3016767100 DAMPER AS DU24 013 x x 1 1 81 3011450901 COVER DUCT CHANGE RM AS FRU 541E x x 1 1 82 3012529500 GUID...

Page 82: ...MOLD DY 220 240V 50Hz 1 1 116 3012520510 GUIDE ICE CRUSHER L ABS 1 1 117 3012517710 GUIDE ICE CRUSHER R ABS 1 1 118 3011115202 CASE I CRUSHER AS FRU 541D 1 1 119 3001401760 COVER F FAN AS FRU 541 547...

Page 83: ...RY AS FRU 54AD 1 1 157 3019027230 POCKET R M AS FRU 54AD 2 1 158 3019027720 POCKET R H BAR AS FRU 54AF x 1 159 3011187020 CASE H BAR AS FRU 54AF x 1 160 3019027330 POCKET R S AS FRU 54AD 2 2 300007991...

Page 84: ...47F 2 2 156 3019027530 POCKET DAIRY AS FRU 54AD 1 1 157 3019027230 POCKET R M AS FRU 54AD 2 1 158 3019027720 POCKET R H BAR AS FRU 54AF x 1 159 3011187020 CASE H BAR AS FRU 54AF x 1 160 3019027330 POC...

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