LG LPC-LM440A/X, Service Manual

Page 1: ...MP3 CD LOGIC DECK CASSETTE RECORDER SERVICE MANUAL MODEL LPC LM440A X LPC LM445A X SERVICE MANUAL MODEL LPC LM440A X LPC LM445A X ...

Page 2: ... OFCONTROLS 1 6 SECTION 2 ELECTRICAL SECTION ADJUSTMENT 2 1 TROUBLESHOOTING GUIDE 2 2 INTERAL BLOCK DIAGRAM OF ICs 2 17 IC TR VOLTAGE PIN DESCRIPTION 2 23 BLOCK DIAGRAM 2 27 SCHEMATIC DIAGRAMS 2 29 WIRING DIAGRAM 2 41 PRINTED CIRCUIT BOARD DIAGRAM 2 43 SECTION 3 EXPLODED VIEWS 3 1 SECTION 4 REPLACEMENT PARTS 4 1 ...

Page 3: ...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 4: ... replacing a component part first disconnect the power supply lead wire from the unit 2 All equipment measuring instruments and tools must be grounded 3 The workbench should be covered with a conductive sheet and grounded When removing the laser pick up from its conductive 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 ...

Page 5: ...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 6: ...00 Hz Signal to noise ratio 65 dB T H D Tuning Range 87 5 108 MHz 65 74 MHz or 87 5 108 MHz Intermediate Frequency 10 7 MHz Antenna Telescopic antenna Tuning Range 522 1620 kHz or 520 1720kHz Intermediate Frequency 450 kHz Antenna Ferrite bar antenna Recording System 4 Tracks 2 channel stereo Frequency Response 125 8000Hz Signal to Noise Ratio 40 45dB REC PLAY Designs and specifications are subjec...

Page 7: ... 1 6 IDENTIFICATIONS OF CONTROLS Front Front ...

Page 8: ... 1 7 Rear Panel Remote Control Bottom Panel ...

Page 9: ... 1 8 ...

Page 10: ...utput L R Maximum 2 RECORD BIAS ADJUSTMENT DECK MODE TEST TAPE TEST POINT ADJUSTMENT ADJUST FOR AUTO RVS 75KHz 5KHz AUTO STOP 65KHz 5KHz 3 TAPE SPEED ADJUSTMENT DECK MODE TEST TAPE TEST POINT ADJUSTMENT ADJUST FOR PLAYBACK MTT 111 L R Output 3kHz 50Hz Azimuth adjusting screw SR490 REC MODE MTT 5511 C465 OR C415 DECK CIRCUIT B POINT L405 ...

Page 11: ...READING DISPLAY CHECK CONNECTOR CHECK PN802 PN806 CHECK MICOM INTERFACE CIRCUIT PN805 READING OK CHECK CONNECTOR CHECK PN801 CHECK PICKUP MOVEMENT CHECK AM5810FP IC802 CHECK LC78690N IC801 CONNECTOR CHECK PN806 Pin1 Pin3 IF PLAY AUDIO OUTPUT CHECK OK YES YES YES YES NO NO NO NO NO NO NO ...

Page 12: ...V PICK UP UNIT OR Q801 DEFECTIVE MAIN B D CHECK Q102 C 4 6V Check Q101 B 4 5V CONNECTOR LOCKING CHECK PN813 AD 5V CHECK PN805 Pin3 CONNECTOR LOCKING CHECK PN801 PN805 PN802 PN806 CHECK POWER SUPPLY MAIN PN251 PN251 PIN 5 6 2V PIN 7 6 2V CHECK VOLTAGE CD B D IC804 Pin3 6 2V Pin 2 4 3 3V CHECK INTERFACE WITH MICOM MAIN CN111 Pin 6 7 8 9 10 11 12 13 LASER ON CD B D PN801 Pin 10 1 96V NO NO NO NO NO N...

Page 13: ...in14 15 TA TA CHECK PN801 Pin10 LD DEFECTIVE PICKUP OR IC802 OR IC801 DEFECTIVE PICKUP OR IC802 OR IC801 DEFECTIVE PICK UP OR IC802 OR IC801 DEFECTIVE PICKUP OR IC802 OR IC801 DEFECTIVE PICKUP OR IC801 OR Q801 DOES SLED MOVE DOSE LENSE MOVE UP DOWN DOSE LASER LIGHT DOES SPINDLE ROTATE IS READING OK YES YES YES NO NO NO NO NO NO NO NO NO NO YES YES A B C D E ...

Page 14: ... DOSE SLIN WAVEFORM APPEAR AT IC802 Pin5 DRIVE WAVE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PICK UP SLED MOTOR DEFECTIVE PN802 CONNECTOR DOSE SL WAVEFORM APPEAR AT IC802 Pin13 SLED MOTOR WAVE CHECK PN802 CONNECTOR LINE YES NO NO NO NO NO A ...

Page 15: ...FAIN WAVEFORM APPEAR AT IC802 Pin22 DRIVE WAVE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PICK UP FOCUS ACTUATOR DEFECTIVE PN801 CONNECTOR DOSE FA WAVEFORM APPEAR AT IC802 Pin16 FOCUS COIL DRIVE WAVE CHECK PN801 CONNECTOR LINE YES NO NO NO NO NO B ...

Page 16: ...VOLTAGE CHECK 3 1V O K LASER CONTROL VOLTAGE CHECK IC801 Pin 18 2 45 DEFECTIVE IC801 DEFECTIVE IC801 DEFECTIVE Q801 DEFECTIVE PICK UP FOCUS ACTUATOR DEFECTIVE PN801 CONNECTOR Q801 VOLTAGE CHECK 1 96V CHECK PN801 CONNECTOR LINE YES YES NO NO NO NO NO NO C ...

Page 17: ...WAVEFORM APPEAR AT IC802 Pin6 SPINDLE DRIVE WAVE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PICK UP SPINDLE MOTOOR DEFECTIVE PN802 CONNECTOR DOSE SP WAVEFORM APPEAR AT IC802 Pin11 SPINDLE MOTOR DRIVE WAVE CHECK PN802 CONNECTOR LINE YES NO NO NO NO NO D ...

Page 18: ...C801 Pin23 TRACKING DRIVE WAVE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PICKUP OR IC801 DEFECTIVE PN801 CONNECTOR DOSE TA WAVEFORM APPEAR AT IC802 Pin17 TRACKING COIL DRIVE WAVE CHECK PN801 CONNECTOR LINE DOSE RF SIGNAL APPEAR IC801 PORT2 WAVEFORM 6 YES NO NO NO NO NO E ...

Page 19: ...Check theD901 D902 D903 D904 POWER B D Q251 Emittor Voltage Check 9 6V REPLACE Q251 REPLACE IC271 POWER SENSE BLOCK CHECK RESET BLOCK CHECK REPLACE D181 D182 D183 REPLACE X102 REPLACE MICOM IC IC101 LC877480 IC271 Vout Voltage Check 5 2V Q265 Collector Voltage Check 5V Q173 Collector Voltage Check 4 6V D181 D182 D183 Cathode Voltage Check 4 6V OSC CHECK X102 9 8304MHz NO NO YES NO NO NO NO NO NO N...

Page 20: ...651 Q256 Check the signal input of PN251 R CH L CH Check the CD B D Check the LOW of Q601 Q605 Q256 E MUTE TAPE FUNCTION Check the signal input of IC301 Pin 3 26 Refer to TAPE Trouble Shooting CD FUNCTION MUTECheck the signal input of IC301 Pin 6 23 TUNER FUNCTION Check the signal input of IC301 Pin 4 25 Refer to Tuner Pack Trouble Shooting NO NO NO NO NO YES YES YES YES YES YES YES YES ...

Page 21: ...g to IC301 pin 1 Check the DC Output of Q301 6 8V Check the Pattern Replace the IC301 Check the IC101 Check the Data of IC101 pin 6 7 CD TAPE Function Check the CLK Data of IC301 pin 14 15 Check the IC101 Function Selector END NO NO NO NO YES YES YES YES ...

Page 22: ... 2 Tu B Check the DC output of HIGH Q231 C Check the high Q232 B Check the DC output Q233 E pattern CE Chip Emable DI Data Input From u com DO Data Output to u com CLK Tuner Mode Clock Replace Tuner pack or Micom 35 36 37 38 Check Is the normal END NO NO NO YES YES YES ...

Page 23: ...5 C Voltage Check 8 5V PN402 Pin 3 Voltage Check 12 5V Q407 Q489 Check PN402 Pin1 Pin2 Check Normal Speed Q483 10 Q481 10 Q485 Q487 C Voltage Check When solenoid is drived Check the patternCheck PB MUTE Low REC MUTE High REC BIAS Low Check the Deck Mecha Replace the IC201 Replace the Deck Mecha Check the signal output of IC401 Pin 5 26 NO NO YES NO NO YES YES ...

Page 24: ...n 7 24 OR Pattern Check REC_B Voltage 9V Check the Oscillation of Q472 E Check Q211 E Voltage 9V Check Q211 E Voltage 9V Check Q211 E Voltage 9V Check the signal of R463 R413 or L402 Pin2 Pin3 Check Q405 B Low Check Q405 C Low Check REC_BIAS High Check Mechanism Head or Replace Mechanism Is the normal NO NO NO NO NO NO NO YES YES YES YES YES YES ...

Page 25: ...in IC901 Pin6 Pin8 Check the IC301 Pin12 Pin17 Check Q252 Q253 Check Signal in IC901 Pin9 Pin12 Check the Low pass Block IC802 Check IC802 Pin 5 Check IC802 Pin 8 Check IC 901 Pin5 Mode2 MAIN Vcc Check Micom port 97 Mode2_control HIGH OUTPUT O K YES YES YES YES NO NO NO NO NO NO Check Signal in IC601Pin3 Pin5 If head phone jack is inserted 1 Micom port 48 H P IN Low 2 Micom port 9 AMUTE High 3 IC9...

Page 26: ... 2 17 INTERAL BLOCK DIAGRAM OF ICs TDA8947J BLOCK DIAGRAM ...

Page 27: ... supply voltage channel 1 OUT2 4 inverted loudspeaker terminal 2 Mode 2 5 mode selection of subwoofer channel 3 4 IN2 6 input 2 SGND 7 signal ground IN1 8 input 1 IN3 9 input 3 Mode 1 10 mode selection input standby mute operating SVR 11 half supply voltage decoupling ripple rejection IN4 12 input 4 CIV 13 Common input voltage decoupling OUT3 14 inverted loudspeaker terminal 3 GND2 15 ground chann...

Page 28: ... 2 19 TDA7468D BLOCK DIAGRAM ...

Page 29: ... 2 20 PIN CONNECTION HA12237F BLOCK DIAGRAM ...

Page 30: ... 2 21 AM5810 Motor Driver ICs BLOCK DIAGRAM PIN CONFIGURATION ...

Page 31: ... 2 22 PIN DESCRIPTION ...

Page 32: ... 2 23 IC TR VOLTAGE PIN DESCRIPTION ...

Page 33: ... 2 24 ...

Page 34: ... 2 25 ...

Page 35: ... 2 26 ...

Page 36: ...2 27 2 28 BLOCK DIAGRAM ...

Page 37: ...2 29 2 30 SCHEMATIC DIAGRAMS MAIN SCHEMATIC DIAGRAM ...

Page 38: ...2 31 2 32 MICOM SCHEMATIC DIAGRAM ...

Page 39: ...2 33 2 34 KEY SCHEMATIC DIAGRAM ...

Page 40: ... POWER SCHEMATIC DIAGRAM 2 35 2 36 ...

Page 41: ...2 37 2 38 DECK SCHEMATIC DIAGRAM ...

Page 42: ...2 39 2 40 CHIP WMA MODULE SCHEMATIC DIAGRAM ...

Page 43: ...2 41 2 42 WIRING DIAGRAM ...

Page 44: ...2 43 2 44 PRINTED CIRCUIT DIAGRAM MAIN P C BOARD ...

Page 45: ...2 45 2 46 FRONT P C BOARD ...

Page 46: ...2 47 2 48 CDP P C BOARD COMPONENT SIDE ...

Page 47: ...2 49 2 50 CDP P C BOARD SOLDER SIDE ...

Page 48: ...2 51 2 52 POWER P C BOARD ...

Page 49: ... A00 271 452 290 451 451 270 452 253 254 A26 299 255 256 453 257 258 454 286 260 261 452 260 A43 266 284 259 252 251 250 285 455 262 454 A45 A44 A41 A51 A47 274 276 275 A48 A49 288 A42 NOTE Refer to SECTION 4 REPLACE MENT PARTS LIST in order to look for the part number of each part Exposed blade will cause severe injury CAUTION ...

Page 50: ...1A DECK MECHANISM PARTS 50 093 31032 PIGEON CST PULLEY 013 6768RZHP01A DECK MECHANISM PARTS 50 093 4960 PIGEON HEAD ASSY C 014 6768R SP01D DECK MECHANISM PARTS 01 080 4609 PIGEON SPRING CWL4 015 6768R AP01A DECK MECHANISM PARTS 50 268 3016 PIGEON ARM CWL44 016 6768RZBP03A DECK MECHANISM PARTS 02 083 4268 PIGEON BELT FELT B 017 6768R GP03B DECK MECHANISM PARTS 50 222 4578 PIGEON GEAR IDLER 018 6768...

Page 51: ...8RZJP01A DECK MECHANISM PARTS 50 093 31032 PIGEON CST PULLEY 013 6768RZEP05A DECK MECHANISM PARTS 50 093 4809 PIGEON CST HEAD AS 014 6768R SP01D DECK MECHANISM PARTS 01 080 4609 PIGEON SPRING CWL4 015 6768R AP01A DECK MECHANISM PARTS 50 268 3016 PIGEON ARM CWL44 016 6768RZBP02A DECK MECHANISM PARTS 02 083 4267 PIGEON CST BELT FE 017 6768R GP03B DECK MECHANISM PARTS 50 222 4578 PIGEON GEAR IDLER 01...