LG LX-M150A, Service Manual

Page 1: ...MICRO COMPONENT SYSTEM MODEL LX M150A D LXS M150 SERVICE MANUAL MODEL LX M150A D LXS M150 LG Electronics Inc ...

Page 2: ...FORMS OF MAJOR CHECK POINT 2 2 TROUBLESHOOTING 2 4 BLOCK DIAGRAM 2 19 SCHEMATIC DIAGRAMS 2 21 WIRING DIAGRAM 2 29 PRINTED CIRCUIT DIAGRAMS 2 31 INTERNAL BLOCK DIAGRAM OF ICs 2 39 SECTION 3 EXPLODED VIEWS CABINET AND MAIN FRAME SECTION 3 1 SECTION 4 SPEAKER 4 1 SECTION 5 REPLACEMENT PARTS LIST REPLACEMENT PARTS LIST 5 1 CONTENTS ...

Page 3: ...e adjustment point and installation screws should absolutely never 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 ca...

Page 4: ...ed 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 AC leakage the metal part of the soldering iron should be grounded 5 Workers should be grounded by an armband 1MΩ 6 Care should be taken not to permit the laser pick up to come in contact with clothing in order to preve...

Page 5: ...t 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 comparable conductive mat...

Page 6: ...450kHz Signal to noise ratio 35dB Frequency Response 10 1800Hz Output Power 5W 5W AMP T H D 0 5 Frequncy Response 60 20000Hz Signal to noise ratio 60dB Tape Speed 4 75cm sec Wow Flutter 0 3 MTT 111 JIS WTD F F REW time 120sec C 60 TAPE Frequency Response 250 8000 Hz Signal to noise ratio 40dB P B 38dB R P Channel Separation 32dB P B 30dB R P Erase Ratio 50dB MTT 5511 MODEL LXS M150 Type 1Way 1 Spe...

Page 7: ... 1 6 MEMO ...

Page 8: ... 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 2 RECORD BIAS ADJUSTMENT ADJUSTMENTS SECTION 2 ELECTRICAL Deck Mode Test Tape Test Point Adjustment Adjust for Paly...

Page 9: ... 2 2 WAVEFORMS OF MAJOR CHECK POINT ...

Page 10: ...SPINDLE DRIVE AND MOTOR WAVEFORM IC503 pin6 12 when TOC reading 5 TRACK DRIVE AND MOTOR WAVEFORM TP560 IC503 pin23 during normal play 6 RF TRACKING AND FOCUS ERROR WAVEFORM IC502 pin8 21 23 during normal play ...

Page 11: ...22004 IC502 CHECK MN6627933CG IC501 CHECK SA5810FP IC503 CHECK PICKUP MOVEMENT CONNECTOR CHECK PN501 PN503 CHECK MICOM INTERFACE CIRCUIT PN507 CN502 CHECK CHECK MICOM INTERFACE CIRCUIT PN507 CHECK POWER SUPPLY CIRCUIT PN508 CONNECTOR CHECK PN508 PN507 PN503 PN501 AUDIO OUTPUT CHECK READING DISPLAY CHECK ...

Page 12: ...NECTOR OR MAIN POWER SUPPLAY DEFECTIVE IC505 DEFECTIVE MICOM IC300 OR PN507 DEFECTIVE MICOM IC300 PIN97 OR PN507 CHECK RESET SIGNAL OF PN507 PN507 PIN7 5V END CHECK POWER SUPPLY PORT PN508 PN507 PN508 PIN 8 6 2V PIN 7 5V PN507 PIN 1 5V CHECK MICOM INTERFACE CIRCUIT PN507 PN507 PIN 6 8 9 10 SIGNAL CHECK 6 STAT 8 MDATA 9 MCLK 10 MLD CHECK THE WAVE FORM 1 ...

Page 13: ... 16 FA FA CHECK PN501 PIN 10 LD CHECK CN503 PIN 5 6 SP SP DEFECTIVE PICKUP OR IC503 OR IC501 OR IC502 DEFECTIVE PICKUP OR IC503 OR IC501 DEFECTIVE PICKUP OR IC502 DEFECTIVE PICKUP OR IC503 DEFECTIVE PICKUP OR IC503 OR IC501 OR IC502 DOES LASER LIGHT DOES SPINDLE ROTATE IS READING OK CHECK PN501 PIN 14 15 TA TA DOES LENSE MOVE UP DOWN ...

Page 14: ...FORM APPEAR AT IC503 PIN14 AND CN503 PIN3 WAVEFORM 2 SLED MOTOR WAVE DOES SLIN WAVEFORM APPEAR AT IC503 PIN 5 WAVEFORM 2 SLED DRIVE WAVE DEFECTIVE IC501 DEFECTIVE IC503 DEFECTIVE CN503 CONNECTOR DEFECTIVE PICKUP SLED MOTOR CHECK CN503 CONNECTOR LINE END ...

Page 15: ...PPEAR AT IC503 PIN15 AND PN501 PIN16 WAVEFORM 3 FOCUS COIL DRIVE WAVE DOES FAIN WAVEFORM APPEAR AT IC503 PIN 26 WAVEFORM 3 FOCUS DRIVE WAVE DEFECTIVE IC501 DEFECTIVE IC503 CHECK PN501 CONNECTOR LINE DEFECTIVE PN501 CONNECTOR DEFECTIVE PICKUP FOCUS ACTUATOR END ...

Page 16: ...LASER SUPPLY VOLTAGE CHECK IS 3 3 V APPLIED TO PIN3 OF IC502 RF IC SUPPLY VOLTAGE CHECK IS 2 0 V PIN2 OF IC502K LASER CONTROL VOLTAGE CHECK CHECK PN501 CONNECTOR LINE DEFECTIVE IC505 DEFECTIVE IC502 DEFECTIVE Q501 OR D502 DEFECTIVE PN501 CONNECTOR DEFECTIVE PICKUP LASER PART END ...

Page 17: ...PEAR AT IC503 PIN12 AND PN503 PIN6 WAVEFORM 4 SPINDLE MOTOR DRIVE WAVE DOES SPIN WAVEFORM APPEAR AT IC503 PIN 6 WAVEFORM 4 SPINDLE DRIVE WAVE DEFECTIVE IC501 DEFECTIVE IC503 DEFECTIVE PN503 CONNECTOR DEFECTIVE PICKUP SPINDLE MOTOR CHECK PN503 CONNECTOR LINE END ...

Page 18: ...OES TAIN WAVEFORM APPEAR AT IC503 PIN 23 WAVEFORM 5 TRACKING DRIVE WAVE DEFECTIVE IC501 DEFECTIVE IC503 DEFECTIVE PN503 CONNECTOR DEFECTIVE PICKUP OR IC502 DEFECTIVE PICKUP OR IC502 DEFECTIVE IC501 CHECK PN503 CONNECTOR LINE DOES ARF SIGNAL APPEAR IC502 PORT 8 WAVEFORM 6 DOES FE TE SIGNAL APPEAR IC502 PORT FE 23 TE 21 WAVEFORM 6 END ...

Page 19: ... 2 12 AUDIO PART ...

Page 20: ... 2 13 ...

Page 21: ...201 PN201 check Check signal input JK602 IC102 pin17 18 check IC201 Pin4 11 check IC601 pin12 17 output Check the signal input of IC601 pin3 26 IC601 pin12 17 output IC601 pin12 17 output IC601 pin12 17 output ...

Page 22: ... 2 15 ...

Page 23: ... 2 16 ...

Page 24: ... 2 17 ...

Page 25: ... 2 18 Check PN201 Q201 PN202 check IC201 signal check pin4 11 Audio output PN201 pin8 9 Check the signal output of IC201 pin4 11 Check the PN201 pin6 7 SW201 check ...

Page 26: ... 2 19 2 20 BLOCK DIAGRAM ...

Page 27: ... 2 21 2 22 SCHEMATIC DIAGRAMS FRONT POWER SCHEMATIC DIAGRAM ...

Page 28: ... 2 23 2 24 MAIN DECK SCHEMATIC DIAGRAM ...

Page 29: ... 2 25 2 26 TUNER SCHEMATIC DIAGRAM ...

Page 30: ... 2 27 2 28 CDP SCHEMATIC DIAGRAM ...

Page 31: ... 2 29 2 30 WIRING DIAGRAM ...

Page 32: ... 2 31 2 32 PRINTED CIRCUIT DIAGRAMS FRONT POWER P C BOARD Top View FRONT POWER P C BOARD Bottom View ...

Page 33: ... 2 33 2 34 MAIN DECK P C BOARD Top View ...

Page 34: ... 2 35 2 36 MAIN DECK P C BOARD Bottom View ...

Page 35: ... 2 37 2 38 CDP P C BOARD ...

Page 36: ... 2 39 IC300 LC87F73C8A 1 Pin Assignment INTERNAL BLOCK DIAGRAM OF ICs ...

Page 37: ... 2 40 IC601 TDA7468D 1 BLOCK DIAGRAM ...

Page 38: ... 2 41 2 PIN CONNECTION ...

Page 39: ... 2 42 IC301 BU1923 1 BLOCK DIAGRAM ...

Page 40: ... 2 43 IC102LA1837 1 BLOCK DIAGRAM 2 Test Circuit Diagram ...

Page 41: ... 2 44 IC103 LC72131D 1 Pin Assignments ...

Page 42: ... 2 45 IC201 AN7312 1 BLOCK DIAGRAM IC701 LA4631 1 BLOCK DIAGRAM ...

Page 43: ... addresses are multiplexed on the same pins Row address RA0 RA10 column address CA0 CA7 BA Bank Select Address Selects bank to be activated during row address latch time Selects bank for read write durring column address latch time RAS Row Address Strobe Latches row addresses ont eh positive going edge of the CLK with RAS low CAS Column Address Strobe Latches column addresses on the positive going...

Page 44: ...74 264 270 450 450 A43 450 450 450 450 A46 450 450 310 259 454 454 454 450 269 268 287 452 278 454 289 255 253 256 257 258 254 252 251 250 271 305 T901 277 277 276 291 A49 275 290 288 A41 455 451 280 281 282 283 284 285 CABINET AND MAIN FRAME SECTION SECTION 3 EXPLODED VIEWS NOTE Refer to SECTION 5 REPLACEMENT PARTS LIST in order to look for the part number of each part ...

Page 45: ... 3 3 3 4 MEMO MEMO ...

Page 46: ... 4 1 MODEL LXS M150 SECTION 4 SPEAKER SECTION 850 ...

Page 47: ... 4 2 MEMO ...