LG LAC-M1600 Скачать руководство пользователя страница 9 | Manualshive

Страница: 9 / 31

background image

- 2-4 -

When laser does not light.

A

Is “2.4V~3.4V” applied to

pin42 of IC501?

(

➀

3.4V

➁

2.4V)

Did pickup return to

innermost circular?

Does it stop at inner pick

circular after shift?

Is defect output from LMT

SW applied to Pin7 of

PN503?

Is data transferred from

MICOM IC ?

Does voltage appear at

IC503 Pin 13, 14?

Defective MICOM or CN503.

Defective IC501.

Defective slide motor and/or

connector. (CN502)

Defective LMT SW and/or

connector. (CN502,CN503)

Defective MICOM.

Defective IC501

Is power supplied to laser Q541?

(Q541 collector: about 1.8V)

OV

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

NO

OPEN CLOSE

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...
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8
9
10
11
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Содержание LAC-M1600

Страница 1: ...MODEL LAC M3600 SERVICE MANUAL DETACHABLE FRONT PANEL CAR CD RECEIVER SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL LAC M3600 http biz lgservice com ...

Страница 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 DIAGRAMS 2 19 PRINTED CIRCUIT DIARGAMS 2 27 SECTION 3 EXPLODED VIEWS CABINET AND MAIN FRAME SECTION 3 1 MECHANISM PICK UP 3 3 SECTION 4 REPLACEMENT PARTS LIST 4 1 ...

Страница 3: ...t instrument positive 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 replac ing any components use components which ha...

Страница 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...

Страница 5: ... 710kHz 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 Line out 90dB 1kHz Signal to noise ratio Line out 110dB 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 not...

Страница 6: ... reading occur Can disc be played Is audio output supplied OK Check audio circuitry IC501 IC509 CN503 Check tracking servo circuitry Q541 IC501 IC503 Check DISC Check focusing circuitry Q541 IC501 Check laser circuitry Q541 IC501 Check loading supply circuitry Q9001 Q902 Q903 Q904 PN503 IC507 IC506 IC508 Check power supply circuitry Q930 Q924 Q919 Q920 Q921 IC902 pin1 ...

Страница 7: ...defective X101 X102 C101 C102 C103 C104 Q921 ZD910 PCB pattern defective IC906 Pin74 75 76 front PCB pattern defective IC901 Surrounding circuit PCB pattern defective Display LCD connector defective Is IC901 Com1 Com2 Com3 output waveform normal Is u com IC906 Pin 74 75 76 output waveform normal Is u com IC906 LCD reset circuit normal Pin74 Is u com IC906 keyin Pin19 20 5volt input Is u com IC906 ...

Страница 8: ...heck the Data transmission from CN503 Pin21 to MICOM WAVEFORM 5 Check the TRVP Voltage IC501 Pin23 Check the change of SL SL Voltage IC503 Pin13 14 Does FA waveform appear at IC501 Pin23 WAVEFORM 3 Laser light check A focus coil drive wareform TRACKING ERROR wareform Defective contact CN501 Defective PICK UP Defective IC503 Defective IC501 Defective connector CN503 Defective IC503 Defective connec...

Страница 9: ... from LMT SW applied to Pin7 of PN503 Is data transferred from MICOM IC Does voltage appear at IC503 Pin 13 14 Defective MICOM or CN503 Defective IC501 Defective slide motor and or connector CN502 Defective LMT SW and or connector CN502 CN503 Defective MICOM Defective IC501 Is power supplied to laser Q541 Q541 collector about 1 8V OV YES YES YES YES YES YES NO NO NO NO NO NO OPEN CLOSE ...

Страница 10: ...01 Pin25 WAVEFORM 3 Check the signal of IC503 Pin 15 16 WAVEFORM 3 Defective IC501 Defective IC501 Degraded laser diode Defective PICK UP Defective IC501 Defective IC503 Defective contact CN501 or Defective PICK UP Check the change for SP SP Voltage of IC503 Pin11 12 WAVEFORM 1 Check the change for SPDO Voltage of IC501 Pin21 WAVEFORM 1 ...

Страница 11: ...during TOC reading 2 RF WAVEFORM IC501 45 IC501 49 during TOC reading 3 FOCUS DRIVE AND MOTOR WAVEFORM IC501 25 IC503 15 When focus search failed or there is no disc on tray 4 TRACK DRIVE AND MOTOR WAVEFORM IC504 24 IC503 17 during TOC reading There is disc on tray and focus search success ...

Страница 12: ... 2 7 INTERNAL BLOCK DIAGRAM of ICs AV_CAR 1 Micom Port Assignment ...

Страница 13: ... 2 8 2 Pin Descriptions ...

Страница 14: ... 2 9 ...

Страница 15: ... 2 10 BD3805F 1 BLOCK DIAGRAM ...

Страница 16: ... 2 11 MN6627933CN DSP 1 Connection Diagram ...

Страница 17: ... 2 12 TA8275HQ 1 Block Diagram ...

Страница 18: ... 2 13 upd78f0546 Micom 1 Block Diagram ...

Страница 19: ... 2 14 2 Pin lay out ...

Страница 20: ... TM01 Chip input output for serial interface CSI11 P06 TI011 TO01 I O port Capture trigger input to capture register CR001 of 160bit timer evrnt counter 01 TM01 16 bit timer evrnt counter 01 output TM01 P10 SCK10 TXD0 I O port Clock input output for serial interface CSI10 Serial data output from asynchronous serial interface UART0 P11 SI10 RXD0 I O port Serial data input to serial interface CSI10 ...

Страница 21: ...not used XT1 connecting resonator for subsystem clock oscillation P123 I O port An external oscillation circuit is not used XT1 Connecting resonator for subsystem clock oscillation P124 I O port An external oscillation circuit is not used XT2 Connecting resonator for subsystem clock oscillation EXCLKS External clock input for subsystem clock P130 Output port P140 I O port PCL Clock output INTP6 Ex...

Страница 22: ... BLOCK DIAGRAM 2 17 2 18 ...

Страница 23: ...2 19 2 20 SCHEMATIC DIAGRAMS MAIN SCHEMATIC DIAGRAM ...

Страница 24: ...2 21 2 22 MAIN 2 SCHEMATIC DIAGRAM ...

Страница 25: ...2 23 2 24 FRONT SCHEMATIC DIAGRAM ...

Страница 26: ...2 25 2 26 CD SCHEMATIC DIAGRAM ...

Страница 27: ...2 27 2 28 PRINTED CIRCUIT BOARD DIAGRAMS MAIN P C BOARD DIAGRAM ...

Страница 28: ...2 29 2 30 FRONT TRIM P C BOARD DIAGRAM LED P C BOARD ...

Страница 29: ...2 31 2 32 CD P C BOARD ...

Страница 30: ... MAIN FRAME SECTION Accessory 263 283 273 278 279 276 275 274 284 260 302 300 269 280 282 272 A43 A40 A49 A50 255 254 256 257 251 252 253 250 457 A42 270 454 A46 450 450 A41 451 456 266 267 818 835 453 A26 450 450 265 264 450 453 455 454 450 268 ...

Страница 31: ...3 3 3 4 2 3 4 5 1 1 2 MECHANISM PICK UP A03 ...

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