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Samsung UQ18A2QC, Service Manual

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Samsung UQ18A2QC Service Manual Download Page 13

12

3-2-6  If Operation By Remote Control Unit Is Impossible. (Initial Diagnosis)

1) Troubleshooting 

procedure

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Remove power cord and plug in again approx. 5 Seconds

Is operation lamp blinking?

Check as in the procedure “NO Power parts”.

Refer to page 5-2.

Normal

Replace battery.

LCD is faulty.

Replace button.

Micom is faulty.

Receiver module is faulty.

Q601(C4375Y) or Q602(C1623Y) is faulty.

IR LED(CL-1L5EU) is faulty.

“       “ 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 (IC04) is faulty.

Transmission display lamp  (                  ) blinking when

ON/OFF button on the remote control unit pushed?

new1-  5/14/01 8:25 PM  Page 12

Summary of Contents for UQ18A2QC

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 AQ24A2QC AQ18A2QC OUTDOOR UNIT UQ24A2QC UQ18A2QC E DB68 00276A 5 ...

Page 2: ...reached It is recommended not to pour the refrigerant in too quickly but gradually while operating a pressure valve 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 7 Stop operation of the air conditioner 8 Close the 3 way valve disconnect the pressure gauge and open the 3 way valve again 9 Close th...

Page 3: ...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 way...

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 two fixing screws of front grille 7 Pull the upper left and right of discharge soft ly for the outside cover to be pulled out 8 Pull softly the lower part of discharge and push it up Caution Assemble the front panel and ...

Page 5: ...l the 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 1 and 2 3 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 fix...

Page 6: ...nd Cross Fan 3 1 Do 1 2 3 4 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: ...ve 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 2 2 Outdoor Unit ...

Page 8: ...mpressor stops intermittently in a COOL mode or DRY mode and fan speed of the 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...

Page 9: ...e of 1 indoor fan of the micom normal Is voltage at 32 terminal of the Micom normal 0VDC Is voltage at 64 terminal of the Micom normal 5VDC Is the rating voltage 10 range applied to the primary side of the power transformer Check linkage between power cord and terminal tap Check fuse Is 14 18VAC appear in the secondary side of the power transformer Replace power transformer YES NO YES NO YES YES Y...

Page 10: ...nplugging 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 NO power parts Refer tp page 8 Microcomputer is out of order PCB is o...

Page 11: ...n five seconds Does the operating lamp blink YES YES NO NO NO 2 NO YES NO NO Outdoor unit is out of order Power relay is out of order Power relay should be replaced PCB should be checked PCB is out of order PCB should be checked Room temperature sensor should be checked Room temperature sensor is out of order Check as in the procedure No Power parts Refer to page 5 2 YES Is the room sensor normal ...

Page 12: ...C05 KID65003 is faulty Micom IC04 is faulty Normal Check as in the procedure No Power parts Refer to page 5 2 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 CN71 and CN78 connector After training on the heating operation should start in five minu...

Page 13: ... Micom is faulty Receiver module is faulty Q601 C4375Y or Q602 C1623Y is faulty IR LED CL 1L5EU is faulty 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...

Page 14: ...13 MEMO ...

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

Page 16: ...CLEANER FILTER COVER TERMINAL ASS Y FRONT PANEL ASS Y PCB 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 MAIN PCB ASS Y TERMISTOR CASE CONTROL ASS Y BACK BODY HOLDER PIPE PLATE HANGER ...

Page 17: ...4 2 Outdoor Unit 4 2 1 UQ18A2QC 16 17 8 16 7 6 11 1 4 3 2 5 10 12 13 1 15 1 15 15 4 15 5 15 3 15 2 14 1 14 14 3 13 13 2 14 2 12 3 12 4 13 1 12 2 12 1 13 12 9 18 1 18 2 18 3 18 4 ...

Page 18: ...BASE OUT ASS Y FAN NET FLANGE MOTOR FAN OUT BASE MOTOR PARTITION ASS Y CONDENSER COVER CONTROL ASS Y CABi BACK TOP COVER COMPRESSOR GROMMET ISOLATOR NUT WASHER NUT FLANGE COVER TERMINAL ASS Y 4WAY V V PACKED V V 1 2 4WAY V V ASS Y CHECK V V TUBE CAPI C PACKED V V 1 4 TUBE CAPI H ASS Y CONTROL OUT SWITCH MAGNET CAPACITOR DUAL TERMINAL BLOCK SPARK KILLER FUSE CLOTH SOUND CLOTH SOUND UP CONNECTOR WIR...

Page 19: ...18 12 3 12 4 13 1 12 2 12 1 13 12 18 1 18 2 18 3 18 4 4 2 2 UQ24A2QC 8 16 17 7 6 11 1 4 3 2 5 10 12 13 1 15 15 4 15 5 15 3 15 2 15 1 14 14 1 13 13 2 14 2 9 ...

Page 20: ...SE OUT ASS Y FAN BOLT SPECIAL MOTOR FAN OUT ASS Y MOTOR B K PARTITION ASS Y CONDENSER COVER CONTROL CABI SIDE OUT TOP COVER COMPRESSOR ASS Y 4WAY V V PACKED V V5 8 4WAY V V ASS Y CHECK V V TUBE CAPI C PACKED V V 1 4 TUBE CAPI H ASS Y CONTROL OUT SWITCH MAGNET CAPACITOR DUAL TERMINAL BLOCK SPARK KILLER FUSE CLOTH SOUND COMP CLOTH SOUND UP CONNECTOR WIRE DRAIN PLUG OUT NUT FLANGE 1 4 NUT FLANGE 5 8 ...

Page 21: ...0555C DB32 10008E DB93 10599B DB26 10065B CASE CONTROL ASS Y MAIN PCB ASS Y MAIN PCB ASS Y THERMISTOR ASS Y PCB DISPLAY TRANSFORMER PP PD Q24B1Q 02 PD Q24B1Q 05 103AT ASS Y edge AC230V DC17 1 1 1 1 1 1 1 1 1 1 Description Specification Remark Q TY AQ24A2QC AQ18A2QC 4 3 PCB Box ...

Page 22: ...alve T1 T2 STD Pressure Piping Temp F Use Temp Condition F Model Operating Condition psi T1 T2 Indoor Outdoor 3 WAY Valve DB WB DB WB Standard 57 71 46 54 46 54 80 67 95 75 Cooling Max over load 80 67 115 75 AQ24A1QC Low temp 67 57 67 57 Standard 312 340 97 117 154 169 70 60 47 43 Heating Max over load 80 75 65 Deice 70 60 35 33 Standard 64 78 50 54 50 54 80 67 95 75 Cooling Max over load 80 67 11...

Page 23: ...6 PCB Diagrams 6 1 Main PCB DB93 10545C AQ24A2QC DB93 10555C AQ18A2QC 22 ...

Page 24: ... 001038 3711 001036 3711 001154 B3068 0092 DE39 60001A DB47 90053A 2305 001027 FUSE HOLDER FUSE IC VOLT REGU HEAT SINK SCREW PH IC VOLT REGU C FILM FILTER NOISE R CARBON R CARBON R CARBON R CARBON R CARBON R CARBON R CARBON R CARBON R CARBON R METAL FILM DIODE RECT THYRISTOR BUZZER C CERAMIC C CERAMIC C CERAMIC C ELEC C ELEC C ELEC C ELEC IC MCU IC RSONATOR CERAMIC IC DRIVE TR GENERAL TRANSISTOR T...

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

Page 26: ...RMINAL BLOCK 20S SOLENOID COIL FM1 FAN MOTOR F FUSE 2A 250V S SPARK KILLER CAPACITOR 2 5 40MF X 450VAC MARK NAME MARK NAME 52C MAGNETIC CONTACTOR TB 1 2 TERMINAL BLOCK 20S SOLENOID COIL CH CRANK CASE HEATER C1 CAPACITOR FM1 FAN MOTOR F FUSE 2A 250V S SPARK KILLER CAPACITOR 3 0 35MF X 450VAC ...

Page 27: ...27 ...

Page 28: ...ELECTRONICS ...

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