LG LAC-M4510 Service Manual Download Page 19 | Manualshive

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IC801 TA8275H

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Summary of Contents for LAC-M4510

Page 1: ...SERVICE MANUAL MODEL LAC M4510 DETACHABLE FRONT PANEL CAR CD RECEIVER SERVICE MANUAL MODEL LAC M4510 CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL ...

Page 2: ...N 2 ELECTRICAL ELECTRICAL TROUBLESHOOTING GUIDE 2 1 WAVEFORMS OF MAJOR CHECK POINT 2 6 INTERNAL BLOCK DIAGRAM of ICs 2 7 BLOCK DIAGRAM 2 17 SCHEMATIC DIAGRAM 2 19 PRINTED CIRCUIT DIAGRAM 2 25 SECTION 3 CABINET MAIN CHASSIS MECHANISM EXPLODED VIEW 3 1 SECTION 4 REPLACEMENT PARTS LIST 4 1 CONTENTS ...

Page 3: ...itive lead Always remove the test instrument ground lead last 1 The service precautions are indicated or printed on the cabinet chassis or components When servicing follow the printed or indicated service precautions and service materials 2 The Components used in the unit have a specified conflammability and dielectric strength When replacing any components use components which have the same ratin...

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: ...Hz 520 1 620kHz Intermediate frequency 10 8MHz 450kHz Usable sensitivity 10dBµV 28dBµV Signal to noise ratio 55dB 45dB 3 COMPACT DISC SECTION Frequency response 40Hz 20kHz Channel separation 50dB 1kHz Signal to noise ratio 60dB 4 AUDIO SECTION Maximum output power 50W x 4 Speaker impedance 4Ω x 4 or 8Ω x 4 NOTE The design and specifications are subject to change without notice in the sourse of pro...

Page 6: ...wer supply circuitry Q380 Q381 Q382 Q230 IC201 Pin1 IC401 Pin3 Check loading supply circuitry Q350 Q351 Q353 PN505 IC401 Pin1 Check laser circuitry Q501 IC502 Check focusing circuitry Q501 IC501 Check DISC Check tracking servo circuitry Q501 IC502 IC501 Check audio circuitry IC501 IC601 IC803 OK YES YES YES YES YES YES NO NO NO NO NO 1 No Power SECTION 2 ELECTRICAL ...

Page 7: ... X401 X422 C412 C413 C415 C416 Q260 PN401 front PCB pattern defective IC401 Pin66 67 87 front PCB pattern defective IC901 Surrounding circuit PCB pattern defective Is u com IC401 reset circuit normal Pin88 Is u com IC401 keyin Pin9 37 51 52 64 5volt input Is u com IC401 Pin 66 67 87 output waveform normal Is IC901 Com1 Com2 Com3 output waveform normal Display LCD connector defective Is u com IC401...

Page 8: ...01 Pin31 Check the change of SL SL Voltage IC504 Pin13 14 Check the Voltage change of CN503 Pin10 6 4 6 8V Check the VoltageIC501Pin31 1 4V 1 8V Defective connector CN503 DefectiveIC501 Defective connector CN503 Defective MICOM Defective connector CN503 Defective IC504 Defective IC501 Defective IC504 Defective contact CN502 Defective PICK UP Laserlightcheck A focus coil drive wareform TRACKINGERRO...

Page 9: ...es voltage appear at IC504 Pin 13 14 Defective MICOM or CN503 Defective MICOM Defective IC502 Defective IC501 IC502 Defective slide motor and or connector CN501 Defective LMT SW and or connector CN501 CN503 Did pickup return to innermost circular Does it stop at inner pick circular after shift Is defect output from LMT SW applied to Pin 4 of PN505 YES YES YES YES OPEN CLOSE YES YES YES A OV ...

Page 10: ...M 3 Check the signal FOCUS SEARCH of IC501 Pin 37 WAVEFORM 3 Defective IC501 Defective IC501 Degraded laser diode Defective PICK UP NO NO YES Check the change for SPDO Voltage of IC501 Pin29 WAVEFORM 1 Check thechange forSP SP Voltage ofIC504 Pin11 12WAVEFORM 1 Defective IC501 Defective IC504 DefectivecontactCN502or DefectivePICK UP ...

Page 11: ... IC502 8 IC502 3 during TOC Reading 3 FOCUS DRIVE AND MOTOR WAVEFORM IC501 37 IC504 15 When focus search failed or there is no disc on tray There is disc on tray and focus search success 4 TRACK DRIVE AND MOTOR WAVEFORM IC504 35 IC504 17 during TOC Reading 5 MICOM INTERFACE WAVEFORM CN503 18 19 20 21 during normal play ...

Page 12: ... 2 7 IC401PD784214A 1 PORT ASSIGNMENT INTERNAL BLOCK DIAGRAM of ICs ...

Page 13: ... 2 8 IC501 MN6627933CG ...

Page 14: ... 2 9 1 BLOCK DIAGRAM ...

Page 15: ... CONFIGURATION VO2 FWD REV IN2 VO2 BIAS OPIN4 OPIN4 MUTE GND VO3 VO3 OP OUT4 OPIN3 OPIN3 OPOUT3 POWVCC34 VO4 VO4 LDCONT PS INÅå PR EVCC VOL VOL 22 21 20 19 18 17 16 15 23 24 25 26 27 12 14 10 11 9 7 6 5 4 3 2 1 8 28 AM5810 POWVCC12 VO1 VO1 13 ...

Page 16: ...d output of CH2 12 VO2 Not inverted output of CH2 13 VO1 Inverted output of CH1 14 VO1 Not inverted output of CH1 15 VO4 Not inverted output of CH4 16 VO4 Inverted output of CH4 17 VO3 Not inverted output of CH3 18 VO3 Inverted output of CH3 19 GND Substrate ground 20 POWVCC34 Power unit power supply input terminal CH3 CH4 21 MUTE Input for mute control 22 OPOUT3 Output of CH3 OP ANP 23 OPIN3 Inve...

Page 17: ... 2 12 IC505 AMC1117 1 BLOCK DIAGRAM ...

Page 18: ... 2 13 IC601TDA7348D ...

Page 19: ... 2 14 IC801 TA8275H ...

Page 20: ... 2 15 IC901 PT6524 1 BLOCK DIAGRAM 2 PIN CONFIGURATION ...

Page 21: ... 2 16 ...

Page 22: ... AN22004A RADIO VCC Q310 ZD313 LINE SW E VOLUME 9 4V REG Q360 ZD361 POWER 5V Q282 Q283 7 5V REG Q350 351 3 3V REG IC505 U COM uPD784214A KEY MATRIX RESISTOR RADER RESET IC201 5V CONVERT Q260 D233 REG 9V IC403 Q371 LCD CONTROL LCD DRIVER IC901 PT6524 LCD DISPLAY DIMMER CONTROL Q371 PHONE MUTE Q280 281 ACC DETECTOR Q230 D231 D232 REMOTE CONTROL Q320 321 ANT CONTROL Q390 391 POWER ON Q380 381 MUTE CC...

Page 23: ...2 19 2 20 SCHEMATIC DIAGRAM 1 MAIN SCHEMATIC DIAGRAM ...

Page 24: ...2 21 2 22 2 FRONT SCHEMATIC DIAGRAM ...

Page 25: ...2 23 2 24 3 CDP SCHEMATIC DIAGRAM ...

Page 26: ...2 25 2 26 4 TRIM SCHEMATIC DIAGRAM ...

Page 27: ...2 27 2 28 5 LIGHTIN SCHEMATIC DIAGRAM ...

Page 28: ...2 29 2 30 PRINTED CIRCUIT DIAGRAM 1 MAIN P C BOARD ...

Page 29: ...2 31 2 32 2 FRONT P C BOARD 2 FRONT P C BOARD ...

Page 30: ...2 33 2 34 3 CDP P C BOARD 3 CDP P C BOARD ...

Page 31: ...2 35 2 36 5 LED P C BOARD 5 LED P C BOARD 4 TRIM P C BOARD 4 TRIM P C BOARD ...

Page 32: ...270 277 A48 272 276 271 295 273 278 288 A45 263 253 261 A40 248 296 250 249 A43 257 256 247 246 267 259 258 254 255 262 269 282 283 281 280 A49 NOTE Refer to SECTION 4 REPLACEMENT PARTS LIST in order to look for the part number of each part SECTION 3 CABINET MAINCHASSIS MECHANISM ...

Page 33: ...3 3 3 4 ...

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