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Samsung UQ18A6RC, Service Manual

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3-2-2  When the Indoor Unit Fan Does Not Operate. (Initial Diagnosis)

9

1)  Checklist :

(1) Is the indoor unit fan motor properly connected with the connector (CN73)?
(2) Is the AC voltage correct?
(3) Is HALL IC in indoor fan motor properly connected with the connector (CN43)?
(4) Is the running capacitor properly connected with the solder part of the PCB?

2) Troubleshooting procedure

After unplugging out the power cord should

be reconnected within five seconds.

Does the operating lamp(Green) blink?

Does the Solid State Relay(SS71) work
properly?

Is the supply voltage of the fan

motor sufficient?

Test rod location

PCB CN73

pin3, pin5

Condition

Fan operate

= AC 180V

Normal
voltage

YES

YES

YES

NO

NO

NO

Check as in the procedur ÒNO power partsÓ Refer tp

page 3-2.

Microcomputer is out of order.

PCB is

out of order.

Refer to replace 

PCB module

Replace MFC

Fan motor

should be replaced.

Fan motor

is out of order.

MF-C is out of order

YES

-

Test rod location

+

SS71+

SS71-

12V

Normal

Voltage

.

.

 9-00188A(3)-TS  4/17/01 5:16 PM  Page 9

Summary of Contents for UQ18A6RC

Page 1: ...n 2 Disassembly and Reassembly 3 Troubleshooting 4 Exploded Views and Parts List 5 Refrigerating Cycle Block Diagrams 6 Wiring Diagrams 7 Schematic Diagrams ROOM AIR CONDITIONER INDOOR UNIT AQ24A2RC AQ18A6RC OUTDOOR UNIT UQ24A2RC UQ18A6RC E DB81 00188A 3 ...

Page 2: ...ve and open the 3 way valve again 5 Check the pressure indicated by the pressure gauge low pressure side Standard pressure is should be 4 5 5 5kg cm2 in a reqular high operation mode 6 Open the refrigerant tank and fill with refrigerant until the rated pressure is reached It is recommended not to pour the refrigerant in too quickly but gradually while operating a pressure valve 8 Close the 3 way v...

Page 3: ...l entering 6 Make sure you do not bend the connection pipes in the middle and store together with the cables 7 Move the indoor and outdoor units to a new locatioon 8 Remove the mounting plate for the indoor unit and move it to a new location Pump down shall be carried out when an evaporator is replaced or when the unit is relocated in another area 1 Remove the caps from the 2 way valve and the 3 w...

Page 4: ...to the left and right handle and pull to open the inlet grille 4 Take the left and right filter out 5 Loosen one of the right fixing screw and seperate the terminal cover 6 Loosen three fixing screws of front grille 7 Pull the upper left right and center of discharge softly for the outside cover to be pulled out 8 Pull softly the lower part of discharge and push it up Caution Assemble the front pa...

Page 5: ...e connector of PCB upper side out Inclusion Power cord 3 Separate the outdoor unit connection wire from the terminal block 4 If pulling the Main PCB up it will be taken out Separate the TRANS hook it before 1 Do Ò1Ó and Ò2Ó Ò3Ó above 2 Loosen two fixing earth screws of right side 3 Separate the connection pipe 4 Separate the bush body at the upper side and holder at the rearside 5 Loosen the two f...

Page 6: ...d Cross Fan 1 DoÒ1ÓÒ2ÓÓ3ÓÒ4Ó above 2 Loosen the fixing three screws and separate the motor holder 3 Loosen the fixing screw of fan motor By use of M3 wrench 4 Separate the fan motor from the fan 5 Separate the fan from the left holder bearing ...

Page 7: ...op cover 3 Remove the control box cover 4 Unplug the ass y cable 5 Remove the cabi side 6 Remove the cabi front When you assemble the parts check if the each parts and electric connectors are fixed firmly 1 Do Procedure 1 above 2 Remove the nut flange Turn to the right to remove as it is a left turned screw 3 Disassemble the propeller fan ...

Page 8: ...e indoor unit decreases It indicates power is on The LED stops blinking if the operation ON OFF button on the remote control unit is pushed In happens after a delay of 3 minutes when the compressor is reoperated The same phenomenon occurs when a power is on As a phenomenon that the compressor is reoperated after a delay of 3 minutes the indoor fan is adjusted automatically with reference to a temp...

Page 9: ...oor fan of the micom normal Is voltage at 33 terminal of the Micom normal 0VDC Is voltage at 18 terminal of the Micom normal 5VDC Is the input rating 10 range applied to the between 1 and 3 of CN78 Check linkage between power cord and terminal tap Check fuse Is 11 12 5VAC appear in the input side of the DC regulator IC KA7805 ICO2 Refer to replace PCB Module YES NO YES NO YES YES YES NO YES YES YE...

Page 10: ...ging out the power cord should be reconnected within five seconds Does the operating lamp Green blink Does the Solid State Relay SS71 work properly Is the supply voltage of the fan motor sufficient Test rod location PCB CN73 pin3 pin5 Condition Fan operate AC 180V Normal voltage YES YES YES NO NO NO Check as in the procedur ÒNO power partsÓ Refer tp page 3 2 Microcomputer is out of order PCB is ou...

Page 11: ...operating lamp blink YES YES NO NO NO NO NO YES NO Outdoor unit is out of order Power relay is out of order Power relay should be replaced Refer to replace PCB module PCB is out of order PCB and Room tempera ture sensor should be checked Room temperature sensor is out of order Check as in the procedure No Power parts Refer to page 8 YES Is the room sensor normal register 25 C 10K 10 C 20 C 30 C 17...

Page 12: ...r IC05 KID65003 or IC06 is faulty Micom IC04 is faulty Normal Check as in the procedure No Power parts Refer to page 8 3 2 5 In the mode When there is no warm air current Check this first 1 Is the set temperature of Remote Control lower than room temperature in Heat mode 2 Is the Indoor PCB properly connected with the CN78 connector After training on the heating operation should start in five minu...

Page 13: ...is faulty Q601 C4375Y or Q602 C1623Y is faulty IR LED CL 1L5EU is faulty Ò Ò sound heard from the indoor unit when ON OFF button on the remote control unit pushed Voltage of battery less than 2 5V Remote Control Unit LCD display status of REMOCON normal Voltage at PIN 30 of Remocon Micom change Voltage at collecter of Q601 or Q602 change Voltage at pin 26 of micom IC04 change INDOOR UNIT Micom IC0...

Page 14: ...B module 3 3 1 Replace PCB module Remove power cord Replace the PCB module Check the connection and plug in Refer to set up the Model option Does al display lamp blink or STD lamp blink YES NO Replace another PCB module ...

Page 15: ...14 4 Exploded Views and Parts List 4 1 Indoor Unit 1 2 4 5 7 1 6 6 1 20 10 3 10 1 10 2 21 14 16 11 12 13 1 13 13 2 9 8 13 3 17 18 19 10 15 7 2 3 2 3 3 3 1 3 7 ...

Page 16: ...R COVER TERMINAL ASS Y FRONT PANEL ASS Y PCB DISPLAY COVER DISPLAY ASS Y TRAY DRAIN ASS Y STEPING MOTOR BLADE H ASS Y EVAP ASS Y EVAP SPACER EVAP ASS Y HOLDER MOTOR HOLDER MOTOR CLIP EARTH WIRE TERMINAL BLOCK ASS Y MOTOR FAN IN ASS Y C F FAN ASS Y HOLDER BEARING RUBBER BEARING HOLDER BEARING BEARING ASS Y MAIN PCB ASS Y TERMISTOR CASE CONTROL ASS Y BACK BODY HOLDER PIPE PLATE HANGER COVER TERMINAL...

Page 17: ...8 16 7 6 11 1 4 3 2 5 10 12 12 1 12 2 13 1 15 6 15 1 15 15 4 15 5 15 3 15 2 14 1 14 14 3 13 13 2 14 2 16 4 2 Outdoor Unit 4 2 1 24K BTU 17 2 17 1 17 3 9 ...

Page 18: ...B26UABCA EPDM M8 ASSÕY 20LT MIN CHV 0201 ASSÕY C1220T O Ò 1 4 INCH C1220T O ASSÕY 41NB21AG 35µFx450VAC 7P 2A 250V 4µF 450VAC PP C3771BD C3771BD 1 1 1 1 1 1 1 1 1 1 1 1 4 4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 Description Specification Remark QÕTY UQ24AZRC 1 2 3 4 5 6 7 8 9 10 11 12 12 1 12 2 13 13 1 13 2 14 14 1 14 2 14 3 15 15 1 15 2 15 3 15 4 15 5 15 6 16 17 1 17 2 17 3 DB90 10634A DB90 20210A DB...

Page 19: ...18 4 2 2 18K BTU 17 3 17 2 17 4 2 5 3 4 6 7 16 8 10 9 1 11 12 1 12 2 12 12 4 12 3 15 1 15 4 14 15 15 6 15 3 15 2 15 7 13 1 13 12 5 17 1 ...

Page 20: ...H NR BLK M8 M5 PBT GRY 240V 45W ASSÕY 10LT MIN ASSÕY ASSÕY 45CG20AGB 40 450VAC 8P 20A ASSÕY 2A 250V 2 5µF 450VAC PW 2N PP CR C3771BD C3771BD 1 1 1 1 1 1 1 1 1 1 1 1 3 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 Description Specification Remark QÕTY UQ18A6RC 1 2 3 4 5 6 7 8 9 10 11 12 12 1 12 2 12 3 12 4 12 5 13 13 1 14 15 15 1 15 2 15 3 15 4 15 5 15 6 15 7 16 17 1 17 2 17 3 17 4 DB90 00260A DB90 20210...

Page 21: ... PCB Box Parts List 4 1 2 5 3 No 1 2 3 4 5 Description ASSÕY MAIN PCB ASSÕY THERMISTOR ASSÕY PCB DISPLAY CASE CONTROL COVER DISPLAY Specification PD TQ24A1R 00 103AT 240 240 ASSÕY ABS ABS QÕTY 1 1 1 1 1 Remark ...

Page 22: ...DB WB Standard 57 71 46 54 46 54 80 67 95 75 Cooling Max over load 80 67 115 75 AQ24A2RC Low temp 67 57 67 57 Standard 270 327 90 97 140 158 70 59 47 43 Heating Max over load 80 75 65 Low temp 70 59 35 33 Standard 64 78 46 54 46 54 80 67 95 75 Cooling Max over load 80 67 95 75 Low temp 67 57 67 57 AQ18A6RC Standard 270 327 90 97 140 158 70 59 47 43 Heating Max over load 80 75 65 Low temp 70 59 35 ...

Page 23: ...22 6 PCB Diagrams 6 1 Main PCB PD TQ24A1R 00 ...

Page 24: ...IC IC DRIVE TR GENERAL TRANSISTOR TRANSISTOR CONNECTOR WAFER CONNECTOR WAFER CONNECTOR WAFER CONNECTOR WAFER CONNECTOR WAFER CONNECTOR WAFER RELAY WIRE SO COPER CONNECTOR WAFER FUSE EEPROM C FILM MPEF R CARBON R CARBON T V S TR Switch FR DIODE Zener 3 6V Zener 11V Photo Coupler Photo Coupler TRANSISTOR SW TRANS R CARBON C ELEC COIL VARISTOR C FILM C FILM FST 250V 3 15A FH 51H 7 5A KA7805A CQS 450V...

Page 25: ...24 7 Wiring Diagrams 7 1 Indoor Unit AQ24A2RC AQ18A6RC ...

Page 26: ... 52C MAGNETIC CONTACTOR TB 1 2 TERMINAL BLOCK 20C SOLENOID COIL CH CRANK CASE HEATER C1 CAPACITOR FM1 FAN MOTOR F FUSE 2A 250V S SPARK KILLER DIAGRAM OUTDOOR MARK NAME MARK NAME 52C MAGNETIC CONTACTOR TB1 2 TERMINAL BLOCK 20S SOLENOID COIL FM1 FAN MOTOR F FUSE S SPARK KILLER ...

Page 27: ...26 ...

Page 28: ...ELECTRONICS ...

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