Samsung MC26AC2-07 Service Manual Download Page 41

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Troubleshooting

Samsung Electronics

5-16

5-3-3 Detailed Procedure

No.

Malfunction

Pull out the power plug from

the AC terminal and confirm

the fuse on the PCB assembly

Turn the power on.

Set the TURBO mode

Checking point (symptoms)

1. Is the broken(open)?

Voltage check

1. AC voltage at BD71(~,~)?

: rating voltage ± 10% range

2. DC voltage at BD71(+,-)?

: about 325[v] ± 10%

3. DC voltage at IC02

: IN-GND

➔

DC12[v]

: OUT-GND

➔

DC5[v]

4. Voltage waveform at Q201

: collector-GND

➔

squarewave

Voltage check

1. check voltage of IC06

(pin#10,pin#8)

: relay on

➔

0.7[v]

: relay off

➔

12[v]

2. Voltage at terminal block

((N1) -1)

➔

rating voltage

Causes

Voltage over

Indoor unit fan

motor short-circuit

SMPS circuit is faulty

PC02, R202-R205

SMPS circuit is faulty

IC06 is faulty

RY71 is faulty

∆

DB98_11868A(1)_1 3/3/03 11:17 AM Page 5-6

Summary of Contents for MC26AC2-07

Page 1: ...DOOR UNIT MC26AC2X CONTENTS AIR CONDITIONER 1 Precautions 2 Product Specifications 3 Operating Instructions and Installation 4 Disassembly and Reassembly 5 Troubleshooting 6 Exploded Views and Parts List 7 Block Diagrams 8 PCB Diagrams 9 Wiring Diagrams 10 Schematic Diagrams ...

Page 2: ...ion cord and avoid tapping into a power cord This practice may result in malfunction or fire 6 After completing repairs and reassembly check the insulation resistance Procedure Prior to applying power measure the resistance between the power cord and the ground terminal The resistance must be greater than 30 megaohms 7 Make sure that the grounds are adequate 8 Make sure that the installation condi...

Page 3: ...MEMO Samsung Electronics 1 2 ...

Page 4: ... INDOOR UNIT MC26AC2 07 INDOOR UNIT MC26AC2 12 OUTDOOR UNIT MC26AC2X MC26AC2 Power Size Perfor mance Type 2 05 x 2 6 995 x 2 1 763x2 0 9 6 39 1 250 5 5 3 15 790 x 245 x 165 31 1 x 9 64 x 6 50 7 7 ø6 35 x 5 ø9 52 x 5 ø18 0 x 2 Resin Cross flow 22 2Row 12Step 3 5 11 942 3 009 1 5 8 42 1 210 5 4 3 15 790 x 245 x 165 31 1 x 9 64 x 6 50 7 7 ø6 35 x 5 ø9 52 x 5 ø18 0 x 2 Resin Cross flow 22 2Row 12Step ...

Page 5: ...245 165 790 Air in Front view Remote control Air out Installation plate 22 45 115 Samsung Electronics 2 2 2 2 Dimensions 2 2 1 Indoor Unit Unit mm ...

Page 6: ...2 3 Samsung Electronics Product Specifications 2 2 2 Outdoor Unit Unit mm Front view Rear view 660 1000 340 796 310 ...

Page 7: ...mperature deg C Low Pressure kg cm 2 G 40 30 6 22 5 27 19 21 5 14 6 11 10 9 8 7 20 30 Outdoor drybulb temperature deg C Low Pressure kg cm 2 G 40 30 6 22 5 27 19 21 5 14 6 Samsung Electronics 2 4 2 3 Pressure Graph MC26AC2 07 MC26AC2 12 ...

Page 8: ... automatically after a period of six hours The Off Timer enables you to switch off the air conditioner automatically after a given period of time that is from 30 minutes to 24 hours To cancel the Off Time press the Set Cancel button The ON Timer enables you to switch on the air conditioner automatically after a given period of time that is from 30 minutes to 24 hours To cancel the On Time press th...

Page 9: ...e But if you pressed the TURBO button in DRY or FAN mode that is changed with AUTO mode automatically 5 SLEEP MODE Sleep mode is available only in COOL mode The operation will stop after 6 hours The setting temperature is automatically raised by 1 C each 1hour When the temperature has been raised by total of 2 C that temperature is maintained 6 FAN SPEED Manual 3 step Auto 4 step Fan speed automat...

Page 10: ...e air conditioner is turned ON at a specified time using OFF TIMER The air Conditioner is turned OFF at a specified time using ON TIMER Only timer LED lights on OFF TIMER Both timer and operation LED lights on 10 SELF Diagnosis 11 BUZZER SOUND Whenever the ON OFF button is pressed or whenever change occurs to the condition which is set up or select the compulsory operation mode buzzer is sounded b...

Page 11: ...light Install a separate sunblind if exposed to direct sun light 2 Make sure that you install the outdoor unit in area allowing good air moment not amplifying noise or vibration especially to avoid disturbing neighbours Fix the unit firmly if it is mounted in a high place 3 Make sure that you install the outdoor unit in area providing good ventilation and which is not dusty It must not be blocked ...

Page 12: ...A Indoor unit gas leak test check point Tape vinyl Piping Indoor unit B Drain hose installation Cut the piping hole sloped slightly Piping Liquid 1 4 Clamper tube Piping Gas 3 8 Installation plate Installation tube Pipe connection Vinyl tape Screw Putty Drain hose Piping may be laid to the rear left right or down Right Rear Down Rear Left 3 1 1 2 3 4 5 6 7 8 9 10 2 Remote control 125mm or more 125...

Page 13: ...ot project by more than 20mm 4 Determine the positions of the wooden uprights to be attached to the window frame 5 Attach the wooden uprights to the window frame in a manner appropriate to the weight of the indoor unit 6 Using tapped screws attach the installation plate to the wooden uprights as illustrated in the last figure opposite On delivery the indoor unit is loaded with an inert gas All thi...

Page 14: ...he assem bly cable into the outdoor unit refer to page 3 8 3 2 2 d Installing and Connecting the Indoor Unit Drain Hose Care must be taken when installing the drain hose for the indoor unit to ensure that any conden sation water is correctly drained outside When passing the drain hose through the 65mm hole drilled in the wall check that none of the following situations occur To install the drain h...

Page 15: ...the flare nut connections with leak detector Two electric cables must be connected to the outdoor unit The assembly cable connecting the indoor unit to the outdoor unit The power cable connecting the auxiliary circuit breaker to the outdoor unit 1 Remove the terminal board cover on the side of the outdoor unit 2 Connect the assembly cable to terminals 1 to 5 and connect the power cable to thermina...

Page 16: ...a grounding electrode Specifications of grounding electrode 1 When an existing grounding terminal is avilable Grounding wire of ø1 6mm or larger solid wire or 2mm2 or larger standard wire Terminal used exclusively for grounding Carbon plastic Steel core PVC insulated wire 2mm2 x3 5m green Terminal M4 Grounding resistance less than 100 ohms existing grounding electrode Grounding screw hole ...

Page 17: ...t please recheck that pressure is staloilization Close the valve of the low pressure side of manifold gauge clockwise Remove the hose of the low pressure side of manifold gauge 7 Check for gas leakage 6 At this time especially check for gas leakage from the 3 way valve s stem nuts and from the service port cap 5 Set valve cork of both liquid side and gas side of packed valve to the open position 2...

Page 18: ...ant 4 Set the unit to Low pressure checking mode Press the ON OFF switch for 5 second All lamps blink on the indoor unit 7 Stop operation of the air conditioner 9 Close the cap of each valve 2 Turn the 3 way valve clockwise to close connect the pressure gauge low pressure side to the service valve and open the 3 way valve again 5 Check the pressure indicated by the pressure gauge low pressure side...

Page 19: ...as Side 160 300 500 200 350 550 Fixing Torque Final Torque Torque kg cm Connection Pipe Length 5m Max 5 10m Air Purge Method Refer to the detailed Air Purge Procedure Refrigerant Adjustment Unnecessary Add 10g of refrigerant R410A Add as liquid state for every 1m Air Purge Method Purge air using a vaccum pump Refrigerant Quantity refer to specification sheet Add 10g of refrigerant R410A Add as liq...

Page 20: ...door unit At this time cover the valve of the outdoor unit and the other pipe using a cap or vinyl plug to avoid foreign material 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 2 Way Valve 2 Way Valve 3 Way ...

Page 21: ...MEMO Samsung Electronics 3 14 ...

Page 22: ...er 3 Contract the second finger 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 separate the terminal cover 6 Loosen three fixing screws of front grille 7 Pull the upper left and right of discharge softly for the outside cover to be pulled out 8 Pull softly the lower part of discharge and push it up Caut...

Page 23: ...in hose from the extension drain hose 2 Pull tray drain out from the back body 1 Do 1 and 2 3 above 2 Loosen two fixing earth screws of right side 3 Separate the connection pipe 4 Separate the holder pipe at the rear side 5 Loosen the three fixing screws of right and left side 6 Lifting the heat exchanger up a little to push the up side for separation from the indoor unit 1 Do 1 2 3 4 above 2 Loos...

Page 24: ... Remove the top 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 25: ...MEMO Samsung Electronics 4 4 ...

Page 26: ...pressor 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 27: ...l Is voltage at 10 terminal of the Micom normal 0VDC Is voltage at 9 terminal of the Micom normal 5VDC Is rating voltage 10 range applied to the primary side of the BD71 Check linkage between power cord and terminal tap Check fuse Is 325VDC appear in the secondary side of BD71 Replace SMPS PARTS YES NO YES NO YES YES YES NO YES YES YES DC5V 10ms 250ns NO NO OK YES YES YES YES NO NO YES Normal Refe...

Page 28: ... the power of the IC01 KA7812 match with the voltage of DC12V Is the F701 3 15A fuse blown Is the secondary voltage of the trans normal AC15V AC25V Is the first voltage of the trans normal the rating voltage 10 range Is the rectifying diode D101 D104 normal Is the IC01 KA7812 normal End Normal operation Replace the fuse Replace the trans Replace the trans Check and replace the rectifying diode Rep...

Page 29: ...re After unplugging out the power cord should be reconnected within five seconds Does the STD lamp Green blink Does the Solid State Relay SS71 work properly Is the supply voltage of the fan motor sufficient Test rod location PCB CN72 Condition Fan operate about AC 180V Normal voltage pin 3 and 5 YES YES YES NO NO NO Check as in the procedure NO power parts Refer to page 5 2 Microcomputer is out of...

Page 30: ...essor or outdoor fan motor replaced Power relay is out of order Power relay should be replaced PCB should be checked Microcomputer is out of order PCB 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 register 10 C 20 C 30 C 17 96kΩ 12 09kΩ 8 3kΩ Does the timer lamp blink during operation Is the power ...

Page 31: ...its B C is turned on Does the No7 pin output of the IC04 maintain Low Are the Q901 and 904 in Turn off condition Are the Q902 Q903 and Q905 in Turn on condition Does the operation of the Q701 lead to activation of the compressor relay RY71 Replace the B compressor Normal Check and replace the relevant IC IC02 IC03 Check and replace the resistance R901 R928 R931 and diode D907 D908 Check and replac...

Page 32: ...conds Does the STD lamp blink YES YES NO NO NO NO YES YES Outdoor unit is out of order Power relay is out of order Power relay should be replaced PCB should be checked Microcomputer is out of order PCB should be checked Room temperature sensor is out of order Check as in the procedure No Power parts Refer to page 5 2 Is the room sensor normal register 10 C 20 C 30 C 17 96kΩ 12 09kΩ 8 3kΩ Does the ...

Page 33: ...cord and plug in again in approx 5 seconds Is STD lamp blinking Does operation start when swing button of the remote control unit pushed Voltage at pin 58 61 of micom ICO4 change Squarewave Volatge at pin 13 16 of IC06 ULN2003AFW change Squarewave UP DOWN louver motor is faulty Driver IC06 ULN2003AFW is faulty Micom IC04 is faulty Normal Check as in the procedure No Power parts Refer to page 5 2 A...

Page 34: ... 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...

Page 35: ...High 2 Does the No1 pin output of the IC04 maintain Low Is the No8 pin output of the IC04 in High condition Are the Q906 and Q907 in turn on condition Is the Q908 in turn off condition Does the operation of the Q702 lead to activation of the SV BY relay RY72 Replace the SV BY Normal Check and replace the relevant IC IC02 IC03 Check and replace the resistance R901 R928 R931 and diode D907 D908 1 Is...

Page 36: ...lay RY72 Normal Check and replace the IC04 Check and replace the IC04 maintain resistance R902 R903 R905 R906 1 Is the No 12 pin voltage of the IC04 DC7V 2 Is the No 3 pin voltage of the IC04 DC5V Check and replace each transistor Is the voltage at both ends of the C901 0V Is the No10 pin voltage of the IC04 DC7V Is the voltage charged to the C904 above DC7V The High condition should be maintained...

Page 37: ... of the C901 Is the 14th pin output of the IC04 maintained at High level Is the Ist pin output of the IC04 maintained at Low level Are the Q906 Q907 and Q909 under turn on condition and is the Q908 under turn off condition Is the Q703 turned on indicating the operating of the SV B relay RY73 Normal operation Check and replace the photo coupler IC02 Check and replace the R929 and R930 Check and rep...

Page 38: ...both ends of the C901 Is the output of the 14th pin of the IC04 maintained a Hight level Is the output of the lst pin of the I04 maintained at Low level Are the Q906 Q907 and Q909 turned on with the Q908 being turned off Is the Q704 turned on indicating the operating condition of the SV C relay RY74 Normal operation Check and replace the photo coupler IC03 Check and replace the R932 and R933 Check...

Page 39: ...4 DC5V Check and replace each transistor Is the voltage at both ends of the C901 0V Is the No10 pin voltage of the IC04 DC7V The High condition should be maintained for about 2 minutes until a voltage of above DC7V is charged to the C904 Is the voltage charged to the C904 above DC7V Check and replace the D903 D905 D906 and Q703 Q704 Check and replace the SVA and SVB solenoid Check and replace the ...

Page 40: ...n its substrate So if a circuit board is roughly handled such lead wires and parts will be easily broken or damaged by bending or shock 5 When soldering the lead wires of any new part be sure to polish them using an emery paper or the like before solding them Since the lead wires of any new part are covered with an oxide film solder cannot adhere to the lead wires if not polished 6 When soldering ...

Page 41: ...voltage at BD71 rating voltage 10 range 2 DC voltage at BD71 about 325 v 10 3 DC voltage at IC02 IN GND DC12 v OUT GND DC5 v 4 Voltage waveform at Q201 collector GND squarewave Voltage check 1 check voltage of IC06 pin 10 pin 8 relay on 0 7 v relay off 12 v 2 Voltage at terminal block N1 1 rating voltage Causes Voltage over Indoor unit fan motor short circuit SMPS circuit is faulty SMPS circuit is...

Page 42: ...bient temperature 10 C 30 C Abnormal OΩ open or short Measure the voltage between ground and signal wire of the fan motor Normal Abnormal Abnormal if voltage does not change from 0V to 5V Normal At ambient temperature 10 C 30 C Abnormal OΩ open or short Measure resistance between red wire and each terminal Normal Approx 380Ω at ambient temperature 20 C 30 C Abnormal OΩ open or short between Resist...

Page 43: ...g up the model option with remocon Note In case the wrong letter has been selected continue to press the button until the correct letter appears 1st If the first stage number appears on the display proceed to the second stage 2nd Every time the and button and each continue to appear 3rd Whenever pressing the 1 2 button the number increase from 0 9 0123456789 and A b C d E F each time If the first ...

Page 44: ...tep 4 Pressing the ON OFF button When pressing the operation ON OFF key with the direction of remote controller for unit the sound Ding or Diriring is heard and the first LED lamp on the left side is flickering at the same time then the input of option is completed If the diriring sound isn t heard try again pressing the ON OFF button Step 5 Unit operation test run First Remove the battery from th...

Page 45: ...Troubleshooting Samsung Electronics 5 20 Table of the option code MODEL MC26AC2 07 MC26AC2 12 OPTION CODE 020000 1000D9 020000 100340 ...

Page 46: ...MEMO 5 21 Samsung Electronics ...

Page 47: ...rts List 6 1 Indoor Unit 19 16 14 24 9 7 23 4 3 5 6 21 22 8 12 17 18 25 13 4 13 3 13 2 13 13 1 11 10 2 1 15 20 1 20 5 20 4 20 20 6 20 6 1 20 2 20 3 You can search for the updated part code number through the ITSELF URL http itself sec samsung co kr ...

Page 48: ...61 40251A DB67 60030A DB96 01123K DB96 01441A DB94 40003A DB93 00251K GRILLE AIR INLET GUARD AIR FILTER ASS Y CLEANER FILTER COVERTER TEMINAL ASSY PANEL FRONT SPACER EVAP LOW SPACER EVAP UP COVER U BEND ASSY CROSS FAN BOLT SPECIAL MOTOR FAN IN THERMISTOR WIRE ASSY ASSY CONTROL IN ASSY PCB MAIN TERMINAL BLOCK CLAMP CABLE ASSY DISPLAY SWITCH PCB CONNECT WIRE PCB ASSY BACK BODY ASSY HOLDER MOTOR HOLD...

Page 49: ...Samsung Electronics 6 3 6 2 Outdoor Unit 12 18 8 2 5 4 3 1 10 14 15 16 16 1 9 9 1 9 2 17 17 1 17 4 13 13 1 13 6 11 19 19 1 19 7 7 6 ...

Page 50: ... 2 13 4 DB63 20002A GASKET EPDM T0 8 2 13 5 DB73 00067A GROMMET ISOLATOR NR 40 6 13 6 DB35 00015V OLP RAC12128 9622 2 14 DB62 01416A TUBE DISCHARGE A ASS Y 1 15 DB62 01417A TUBE DISCHARGE B ASS Y 1 16 DB96 02103A ASSY TUBE BY PASS ASS Y 1 16 1 DB95 00403A ASSY SOLENOIDE COIL ASS Y 1 17 DB99 00282A ASSY VALVE ASS Y 1 17 1 DB62 01414A TUBE SUCTION A ASS Y 1 17 2 DB62 01415A TUBE SUCTION B ASS Y 1 17...

Page 51: ... Electronics 6 5 6 3 ASS Y Remote Control DB93 00251K 1 2 4 5 6 3 7 Parts List No 1 2 3 4 5 6 7 Description INLAY LCD CASE TOP LCD KEY RUBBER ASS Y PCB REMOCON CASE LOW BATTERY COVER Q TY 1 1 1 1 1 1 1 Remark ...

Page 52: ...Y ASS Y DISPLAY PCB CONNECTOR WIRE PCB U D HOLDER CLAMP IN SEAL CONTROL SIDE SEAL H CONTROL FRONT SCREW MACHINE CABLE CLAMP SCREW TAPPING Specification DB61 00160A DB93 01018A DB65 00078A DB93 00927A DB39 00147A DB61 00219A DB72 10191T DB72 00127V 6001 000929 DB65 10074E 6002 000234 Remark 6 4 ASS Y Control In DB93 01223C ...

Page 53: ...MEMO Samsung Electronics 6 7 ...

Page 54: ...7 1 Samsung Electronics 7 Block Diagrams 7 1 Refrigerating Cycle Block Diagram INDOOR UNIT OUTDOOR UNIT ...

Page 55: ...Samsung Electronics 8 1 8 PCB Diagrams 8 1 ASS Y MAIN PCB DB93 01018A TOP PATTERN ...

Page 56: ...IC VOLT REGULATOR IC PHOTO COUPLER FR DIODE T V S VARISTOR RESONATOR CERAM IC SW TRANS FILTER NOISE COIL RELAY POWER BUZZER HOLDER FUSE FUSE FUSE CONNECTOR HEADER CONNECTOR HEADER CONNECTOR HEADER CONNECTOR HEADER CONNECTOR HEADER CONNECTOR HEADER C FILM C AL C AL C AL C ELEC C CERAMIC C CHIP C CHIP C CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP RELAY MINIATURE...

Page 57: ...Samsung Electronics 8 3 BOTTOM PATTERN PCB Diagrams ...

Page 58: ...8 4 Samsung Electronics 8 2 PCB OUTDOOR UNIT PE M3000 02 ...

Page 59: ...01 R402 R701 R704 R701 R706 PCB BOARD Q301 303 IC03 IC05 CN11 CN41 CN71 CN72 CN73 CN74 CN77 CN78 PC31 PC33 X501 C105 C103 C101 VA71 75 DS71 FT71 CN70 RY71 IC04 RY72 74 77 78 IC01 IC01 IC01 IC02 F701 F701 TB71 OPJ2 PI 0 6 SN T 52MM PI 0 6 SN T 52MM 50V 103Z 50V 104Z 50V 104Z 1N4007 RD 1 8 T 10K J RD 1 8 T 10K J RD 1 8 T 10K J RD 1 8 T 1K J RD 1 8 T 330 J RD 1 8 T 6 8K F RS 2 T 51K J FR 1 197 330 KS...

Page 60: ...IC DIODE SWITCHING R CARBON JUMP CONNECTOR WAFER CONNECTOR WIRE Specification 64 5x53 KSM 713TH5 KPT 1105A 102K 104Z IN4148 470 1 2W 5 10mm SMAW200 05 UL1007 AWG 26 1 1 1 1 1 1 3 2 1 1 Location No RM01 SW01 C01 C02 D01 R01 R02 R03 J01 CN02 CN01 Q TY Remark 8 3 ASS Y DISPLAY PCB DB93 00927A 8 4 ASS Y CENTER DISPLAY DB93 00859A ...

Page 61: ...MEMO Samsung Electronics 8 7 ...

Page 62: ...9 1 Samsung Electronics 9 Wiring Diagrams 9 1 Indoor Unit ...

Page 63: ...Samsung Electronics 9 2 9 2 Outdoor Unit ...

Page 64: ...10 1 Samsung Electronics 10 Schematic Diagrams 10 1 Indoor Unit ...

Page 65: ...ou need more information please see the service website Itself Solution Integrated technology supporting electronic library http itself sec samsung co kr Copyright 2002 By Samsung Electronics Co Ltd All rights reserved This manual may not in whole or in part be copied photocopied reproduced translated or converted to any electronic or machine readable from without prior written permission of Samsu...

Page 66: ...ELECTRONICS Samsung Electronics Co Ltd Mar 2003 Printed in Korea Code No DB98 11868A 1 ...

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