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LG LAC-M0510, Service Manual

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LG LAC-M0510 Service Manual Download Page 6

- 2-1 -

❏

ELECTRICAL TROUBLESHOOTING GUIDE

Any Key power on.

Is power turnd on?

DISC loading?

Does initial reading occur?

Can disc be played?

Is audio output supplied?

Check power 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

Summary of Contents for LAC-M0510

Page 1: ...SERVICE MANUAL MODEL LAC M2500R MAY 2005 DETACHABLE FRONT PANEL CAR CD RECEIVER SERVICE MANUAL MODEL LAC M2500R 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: ...3 Check the signal FOCUS SEARCH of IC501 Pin 37 WAVEFORM 3 Defective IC501 Defective IC501 Degraded laser diode Defective PICK UP YES NO NO YES Check the change for SPDO Voltage of IC501 Pin29 WAVEFORM 1 Check thechange forSP SP Voltage ofIC504 Pin11 12 WAVEFORM 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 PD784214A IC401 1 PORT ASSIGNMENT INTERNAL BLOCK DIAGRAM of ICs ...

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

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

Page 15: ... 2 10 AM5810 IC504 1 BLOCK DIAGRAM 2 PIN CONFIGURATION ...

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 AMC1117 IC505 1 BLOCK DIAGRAM ...

Page 18: ... 2 13 TDA7348D IC601 ...

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

Page 20: ... 2 15 PT6523 IC901 ...

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

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 PRINTED CIRCUIT DIAGRAM 1 MAIN P C BOARD ...

Page 27: ...2 28 2 29 2 FRONT P C BOARD 2 FRONT P C BOARD ...

Page 28: ...2 30 2 31 3 CDP P C BOARD 3 CDP P C BOARD ...

Page 29: ...2 32 2 33 4 LED P C BOARD TOP 4 LED P C BOARD BOTTOM ...

Page 30: ... 450 450 451 A46 A41 290 454 278 277 275 272 273 271 276 274 270 A40 330 266 265 A42 A43 264 255 256 262 251 257 281 253 280 258 260 259 302 304 A49 CAUTION Exposed blade will cause severe injury SECTION 3 CABINET MAINCHASSIS MECHANISM ...

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