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LG LM-M540, Service Manual

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LG LM-M540 Service Manual Download Page 7

- 2-3 -

POWER CHECK

Every kinds of Fuse check

C901(+), C902(-) DC power output check

C903(+) DC power output check

IC901, IC902 power output check

IC903 power output check (12V)

CN513 7PIN 5V check (at CD Function)

normal operation

Fuse replace

CN901 1, 5 AC voltage output check

D901 replacement

Power supply Ass’y check 
and transformer replacent

IC301 5V Power output
PN302/CN302 13 PIN check

Check

IC5019BU2090 check & replace

IC501(BU2090) 14PIN HIGH check

Q905 Base HIGH(C103M)
Check and replace defective

Power supply Ass’y check 
and transformer replacent

CN901, 9, 10 pin DC power output check

IC901, IC902 check and replacement

D902, D903, D904, D905 (1SR35) 
check and replacement

IC301 78PIN 5V check

IC904 replacement

Q904(A1273) Base Low check

Q904, CD Ass’y check replacement

Summary of Contents for LM-M540

Page 1: ...GRAM of ICs 2 21 BLOCK DIAGRAM 2 31 SCHEMATIC DIAGRAMS 2 33 WIREING DIAGRAM 2 45 PRINTED CIRCUIT DIAGRAMS 2 47 SECTION 3 EXPLODED VIEWS CABINET AND MAIN FRAME SECTION 3 1 TAPE DECK MECHANISM A R A S LEFT A S DECK 3 3 TAPE DECK MECHANISM A R A S RIGHT A R DECK 3 5 CD MECHANISM 3 7 SECTION 4 SPEAKER PART SPEAKER PART 4 1 SECTION 5 REPLACEMENT PARTS LIST REPLACEMENT PARTS LIST 5 1 ...

Page 2: ...ver be touched 4 Laser beams may damage the eyes Absolutely never permit laser beams to enter the eyes Also NEVER switch ON the power to the laser output part lens etc of the pick up if it is damaged 5 Cleaning the lens surface If there is dust on the lens surface the dust should be cleaned away by using an air bush such as used for camera lens The lens is held by a delicate spring When cleaning t...

Page 3: ...tive bag do not place the pick up on the bag This is because there is the possibility of damage by static electricity 4 To prevent AC leakage the metal part of the soldering iron should be grounded 5 Workers should be grounded by an armband 1M Ω 6 Care should be taken not to permit the laser pick up to come in contact with clothing in order to prevent sta tic electricity changes in the clothing to...

Page 4: ...harges sufficient to damage ESD devices 5 Do not use freon propelled chemicals These can generate electrical charges sufficient to damage ESD devices 6 Do not remove a replacement ESD device from its protective package until immediately before you are ready to install it Most replacement ESD devices are packaged with leads electrically shorted together by conductive foam aluminum foil or comparabl...

Page 5: ...nd being aligned 3 Turn volume control to minimum unless otherwise noted 4 Connect low side of signal source and output indicator to chassis ground unless otherwise specified 5 Keep the signal input as low as possible to avoid AGC and AC action TAPE DECK ADJUSTMENT 1 AZIMUTH ADJUSTMENT Figure 1 Azimuth Adjustment Connection Diagram CH1 CH2 Speaker Out Playback Mode Head Test Tape MTT 114 L ch R ch...

Page 6: ...lf wave rectification wave form check R783 check then ZD901 replacement D713 Replacement VKK CHECK CN302 28pin DC 33V check IC301 51PIN check ZD902 33V check Q903 turn on check Pattern disconnection check D912 D911 replacement normal ZD902 replacement Refer to power supply check C916 33V and less check Q903 replacement ...

Page 7: ...t Power supply Ass y check and transformer replacent IC301 5V Power output PN302 CN302 13 PIN check Check IC5019BU2090 check replace IC501 BU2090 14PIN HIGH check Q905 Base HIGH C103M Check and replace defective Power supply Ass y check and transformer replacent CN901 9 10 pin DC power output check IC901 IC902 check and replacement D902 D903 D904 D905 1SR35 check and replacement IC301 78PIN 5V che...

Page 8: ...2 Base and GND operation status check Refer to IC601 TDA7468D IC specification Refer Muting troubleshooting Refer SPK replay troubleshooting IC701 12PIN over 2V check and power supply circuit check No sound IC 601 12 27 PIN Output check IC701 input check 14PIN IC701 output check 6PIN RY701 check normal ...

Page 9: ...mal operation Refer power check Q704 Base High Q704 Replacement RELAY Replacement RY701 Refer IC501 BU2090 Troubleshooting AUX IC601 5 24 PIN signal input check JK600 signal input check Specific FUNCTION MODE has no sound TAPE IC601 3 26 PIN signal input check Refer IC202 Troubleshooting ...

Page 10: ...eck Refer TUNERMODULE MIC IC602 2PIN check Refer to IC404 Troubleshooting IC301 Troubleshooting C301 17 46 72 90 power applied check IC301 26PIN 5V applied check X301 oscilates or not When IC301 11Pin voltage input High Low High IC301 replace Refer to power supply check P SENS terminal check X301 replacement RESET circuit check ...

Page 11: ...01 3 4 PIN data check When switched to CD TAPE Function IC601 TDA7468D Troubleshooting IC601 1PIN power applied check IC601 7 22 Pin waveform output check IC601 8 21Pin waveform input check IC601 12 17Pin waveform output check normal IC601 15 14 Pulse waveform check with tunningVOL DIAL Refer to power supply check IC301 76 75 5 10 Pin check IC601 replacement MICOM 82 83 IC401 21 22 Pattern check I...

Page 12: ...nal output check OK Refer to Muting circuit Refer to power supply check 9 10PIN power check over 5V PLAY check IC202 18PinVCC power applied IC202 5 20 Pin signal output check Muting circuit check Refer to power supply check Deck Mecha operation performance check Deck Mecha replace IC202 replacement ...

Page 13: ...eplacement Refer to IC203 Troubleshooting IC202 18Pin VCC voltage check Power check IC203 Troubleshooting check C236 power supply check Refer to power supply check IC203 Troubleshooting check Q208 replacement L203 replacement Q208 Base 0 6V supplied check Q208 Collector Low Q207 replace normal Dubbing check NORMAL or REC HIGH Q252 202 OFF ON R273 223 Low HIGH Q253 203 ON OFF Refer to REC Check IC2...

Page 14: ...CK MICOM INTERFACE CIRCUIT PN807 CONNECTOR CHECK PN801 PN802 CHECK PICKUP MOVEMENT CHECK BA5810FP IC803 CHECK MN6627933CG IC801 CHECK AN22004 IC802 CONNECTOR CHECK PN808 CONNECTOR CHECK PN808 PN807 PN802 PN801 OPEN CLOSE CHECK READING DISPLAY CHECK READING OK CHECK IF PLAY AUDIO OUTPUT CHECK OK YES YES YES YES YES NO NO NO NO ...

Page 15: ...FECTIVE MICOM DEFECTIVE IC803 DEFECTIVE MECHANISM CHECK POWER SUPPLY CIRCUIT PN808 PN807 PN808 PIN 5 6 2V PIN 7 5V PN807 PIN 1 5V CHECK VOLTAGE CHANGE OF OPEN CLOSE AND BTLMUTE VOLTAGE 5V PN807 PIN 20 OPEN 19 CLOSE 4 BTLMUTE CHECK VOLTAGE CHANGE LO LO OF IC803 PN807 PIN OPEN 20 CLOSE 19 YES YES YES ...

Page 16: ...TOR CHECK RESET SIGNAL OF PN807 PN807 PIN12 5V CHECK VOLTAGE THE PIN 2 OF IC805 IC805 PIN2 3 3V DEFECTIVE MICOM OR CONNECTOR DEFECTIVE IC801 CHECK MICOM INTERFACE CIRCUIT PN807 PN807 PIN 11 13 14 15 SIGNAL CHECK 11 STAT 13 MDATA 14 MCLK 15 MLD CHECK THE WAVE FORM 1 CHECK POWER SUPPLY PORT PN808 PN807 PN808 PIN 5 6 2V PIN 7 5V PN807 PIN 1 5V YES YES NO NO NO NO NO YES YES YES ...

Page 17: ...DOES SPINDLE ROTATE IS READING OK CHECK PN801 PIN 14 15 TA TA CHECK PN802 PIN 5 6 SP SP CHECK PN802 PIN 10 LD CHECK PN801 PIN 13 16 FA FA CHECK PN802 PIN 3 4 SL SL DEFECTIVE PICKUP OR IC803 OR IC801 OR IC802 DEFECTIVE PICKUP OR IC803 OR IC801 DEFECTIVE PICKUP OR IC802 DEFECTIVE PICKUP OR IC803 DEFECTIVE PICKUP OR IC803 OR IC801 OR IC802 NO NO NO NO NO YES YES YES YES YES ...

Page 18: ...APPEAR AT IC803 PIN14 AND PN802 PIN3 WAVEFORM 2 SLED MOTOR WAVE DOES SLIN WAVEFORM APPEAR AT IC803 PIN 5 WAVEFORM 2 SLED DRIVE WAVE DEFECTIVE IC801 CHECK PN802 CONNECTOR LINE DEFECTIVE IC803 DEFECTIVE PN802 CONNECTOR DEFECTIVE PICKUP SLED MOTOR NO NO NO NO NO YES YES ...

Page 19: ...DOES FA WAVEFORM APPEAR AT IC803 PIN15 AND PN801 PIN16 WAVEFORM 3 FOCUS COIL DRIVE WAVE DOES FAIN WAVEFORM APPEAR AT IC803 PIN 26 WAVEFORM 3 FOCUS DRIVE WAVE DEFECTIVE IC801 DEFECTIVE IC803 DEFECTIVE PN801 CONNECTOR CHECK PN801 CONNECTOR LINE DEFECTIVE PICKUP FOCUS ACTUATOR ...

Page 20: ...R SUPPLY VOLTAGE CHECK IS 3 3 V APPLIED TO PIN3 OF IC802 RF IC SUPPLY VOLTAGE CHECK IS 2 0 V PIN2 OF IC802 LASER CONTROL VOLTAGE CHECK DEFECTIVE IC805 DEFECTIVE IC802 CHECK PN801 CONNECTOR LINE DEFECTIVE Q801 OR D811 DEFECTIVE PN801 CONNECTOR DEFECTIVE PICKUP LASER PART NO NO NO NO NO NO YES ...

Page 21: ... SP WAVEFORM APPEAR AT IC803 PIN12 AND PN802 PIN6 WAVE FORM 4 SPINDLE MOTOR DRIVE WAVE DOES SPIN WAVEFORM APPEAR AT IC803 PIN 6 WAVEFORM 4 SPINDLE DRIVE WAVE DEFECTIVE IC801 DEFECTIVE IC803 DEFECTIVE PN802 CONNECTOR DEFECTIVE PICKUP SPINDLE MOTOR CHECK PN802 CONNECTOR LINE ...

Page 22: ...AVEFORM APPEAR AT IC803 PIN 23 WAVEFORM 5 TRACKING DRIVE WAVE DEFECTIVE IC801 DEFECTIVE IC803 DEFECTIVE PN802 CONNECTOR DEFECTIVE PICKUP OR IC802 DEFECTIVE PICKUP OR IC802 DEFECTIVE IC801 CHECK PN802 CONNECTOR LINE DOES ARF SIGNAL APPEAR IC802 PORT 8 WAVEFORM 6 DOES FE TE SIGNAL APPEAR IC802 PORT FE 23 TE 21 WAVEFORM 6 NO NO NO NO NO NO NO YES YES YES ...

Page 23: ... 2 19 WAVEFORMS OF MAKOR CHECK POINT ...

Page 24: ...SPINDLE DRIVE AND MOTOR WAVEFORM IC503 pin6 1 2 when TOC reading 5 TRACK DRIVE AND MOTOR WAVEFORM TP560 IC503 pin23 during normal play 6 RF TRACKING AND FOCUS ERROR WAVEFORM IC502 pin8 2 1 23 during normal play ...

Page 25: ... 2 21 INTERNAL BLOCK DIAGRAM of ICs NJM2706M IC1 BLOCK DIAGRAM PIN CONFIGURATION ...

Page 26: ... 2 22 BA3126N IC201 BLOCK DIAGRAM PIN CONFIGURATION ...

Page 27: ... 2 23 KIA6289N IC202 BLOCK DIAGRAM ...

Page 28: ... 2 24 ...

Page 29: ... 2 25 ...

Page 30: ... 2 26 ...

Page 31: ... 2 27 TDA7468D IC601 BLOCK DIAGRAM ...

Page 32: ... 2 28 PIN CONFIGURATION ...

Page 33: ... 2 29 STK403 070 IC701 BLOCK DIAGRAM ...

Page 34: ... 2 30 ...

Page 35: ... BLOCK DIAGRAM 2 31 2 32 ...

Page 36: ...2 33 2 34 SCHEMATIC DIAGRAMS MAIN SCHEMATIC DIAGRAM ...

Page 37: ...2 35 2 36 MAIN 1 SCHEMATIC DIAGRAM ...

Page 38: ...2 37 2 38 DECK SCHEMATIC DIAGRAM ...

Page 39: ...2 39 2 40 FRONT SCHEMATIC DIAGRAM ...

Page 40: ...2 41 2 42 CDP SCHEMATIC DIAGRAM ...

Page 41: ...rning Parts that are shaded are critical With respect to risk of fire or electrical shock NOTE 1 Shaded parts are critical for safety Replace only with specified part number 2 Voltages are DC measured with a digital voltmefer during Play mode ...

Page 42: ...2 45 2 46 WIRING DIAGRAM PN401 PN901 CN901 ...

Page 43: ...2 47 2 48 PRINTED CIRCUIT DIAGRAMS MAIN P C BOARD COMPONENT SIDE ...

Page 44: ...2 49 2 50 MAIN P C BOARD SOLDER SIDE ...

Page 45: ...2 51 2 52 FRONT P C BOARD ...

Page 46: ...2 53 2 54 POWER P C BOARD COMPONENT SIDE ...

Page 47: ...2 55 2 56 POWER P C BOARD SOLDER SIDE ...

Page 48: ...4 454 454 MIC Option MIC Option MIC Option 514 306 A00 A43 303 272 273 355 A46 A41 A26 270 269 351 354 266 267 268 265 264 263 262 284 285 261 287 258 257 287 255 256 250 253 251 252 254 286 282 284 259 260 MECHA Ass y CABINET AND MAIN FRAME SECTION 3 1 3 2 ...

Page 49: ... 019 6768R SP01P DECK MECHANISM PARTS 01 081 4678 PIGEON SPRING CRL4 020 6768R BP01C DECK MECHANISM PARTS 02 083 4188 PIGEON BELT FELT C 021 6768R LP01C DECK MECHANISM PARTS 50 223 4429 PIGEON PULLEY FLYW 022 6768R VP03A DECK MECHANISM PARTS 50 093 4748 PIGEON SOLENOID AS 023 6768R GP03A DECK MECHANISM PARTS 50 093 4810 PIGEON GEAR ASSY C 025 6768R JP03B DECK MECHANISM PARTS 50 093 31009 PIGEON PU...

Page 50: ...A DECK MECHANISM PARTS 50 093 4748 PIGEON SOLENOID AS 023 6768R GP03A DECK MECHANISM PARTS 50 093 4810 PIGEON GEAR ASSY C 025 6768R JP03B DECK MECHANISM PARTS 50 093 31009 PIGEON PULLEY FLY 026 6768R SP01D DECK MECHANISM PARTS 01 080 4609 PIGEON SPRING CWL4 027 6768R DP01A DECK MECHANISM PARTS 50 259 3342 PIGEON LEVER CWL44 028 6768R RP01A DECK MECHANISM PARTS 22 027 41054 PIGEON ROLLER CWL 029 67...

Page 51: ...7A GEAR PU DOWN CDM H1503 168 4470RB0002A GEAR CAM CDM H1503 169 4860SB0001A CLAMP DISC CDM H1303 170 3550SB0001A COVER MAGNET CDM H1303 171 524 012AAAA COVER CLAMP MAGNET 030X018X5T 172 3040RB0005A BASE MAIN CDM H1503 173 4510RB0001A LEVER S W CLOSE 175 4680SBP001A MOTOR MECH OTHER 177 4470RB0001A GEAR MAIN CDM H1503 184 4900RB0001A DAMPER RUBBER 3CD CHANGER 185 3040SB0003A BASE PU CDM H1303 186 ...

Page 52: ...3 9 3 10 ...

Page 53: ... FOOT EVA PHI 20 X 2T FE 986 886E ST 856 6400TETA03A SPEAKER TWEETER 05N45EHC3489C EAW TWEETER CONE 857 353M025F SCREW DRAWING TAPTITE 3X8 FZMY 858 6400WETH01A SPEAKER WOOFER 13G32B LG01 EAW WOOFER 6OHM 50 859 353M050C SCREW DRAWING BH 3 5X16 FBK 860 4350RM0015A RING SPK LMS M540 MOLD WOOFER RING 861 3091RMW117A CABINET ASSEMBLY SPK LMS M540 CABINET ASSY PB 9 862 3091RMW117B CABINET ASSEMBLY SPK L...

Page 54: ... 4 2 ...

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