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LG LAC-M3600 Service Manual

Detachable front panel car cd receiver.
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DETACHABLE FRONT
PANEL CAR CD RECEIVER
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL.
MODEL : LAC-M3600

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   Summary of Contents for LG LAC-M3600

  • Page 1

    DETACHABLE FRONT PANEL CAR CD RECEIVER SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. MODEL : LAC-M3600...

  • Page 2

    [CONTENTS] ❍ SECTION 1.GENERAL • SERVICING PRECAUTIONS ..........1-2 •...

  • Page 3: Servicing Precautions

    SECTION 1. SUMMARY ❏ SERVICING PRECAUTIONS ❶ Always disconnect the power source before: 1) Removing or reinstalling any component, circuit board, module or any other instrument assembly. 2) Disconnecting or reconnecting any instrument electrical plug or other electrical connection. 3) Connecting a test substitute in parallel with an electrolytic capacitor in the instrument. CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard.

  • Page 4: Esd Precautions

    ❏ ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.

  • Page 5: Specifications

    ❏ SPECIFICATIONS 1. GENERAL Power requirements ..........DC12V~15V Ground system .

  • Page 6: Electrical Troubleshooting Guide

    SECTION 2. ELECTRICAL ❏ ELECTRICAL TROUBLESHOOTING GUIDE 1. No Power. Any Key power on. Check power supply circuitry. Q930, Q924, Q919, Is power turnd on? Q920, Q921, IC902, pin1 Check loading supply circuitry. DISC loading? Q9001, Q902, Q903, Q904, PN503, IC507, IC506, IC508 Check laser circuitry.

  • Page 7

    2. LCD light abnormal. Any Key power on. (without DISC) Power supply circuitry defective. Check voltage in the power Do display LCD then light? Q371,Q372,IC403 supply • Reset circuit defective. Is u-com IC906 LCD reset IC901 Surrounding circuit circuit normal?Pin74 defective.

  • Page 8

    3. Initial reading is not carried out. Defective Check the Voltage change of Slide motor moves connector CN503 CN503 Pin12 (6.4~6.8V) (With disc) Check the Voltage IC501 Defective IC501 Pin23 (1.4V~1.8V) Spindle motor turns Check the Data transmission Defective connector WAVEFORM #1 from CN503 (16, 17, 18) to CD CN503 Defective...

  • Page 9

    When laser does not light. Is “2.4V~3.4V” applied to pin42 of IC501? ➀ 3.4V ➁ 2.4V) Did pickup return to Is data transferred from Defective MICOM or CN503. innermost circular? MICOM IC ? Does voltage appear at Defective IC501. IC503 Pin 13, 14? Defective slide motor and/or connector.

  • Page 10

    When laser light. Laser lights Check the signal FOCUS Defective IC501 SEARCH of IC501 Pin25 WAVEFORM #3 Check the signal of IC503 Pin 15, 16 Defective IC501 WAVEFORM #3 Degraded laser diode Defective PICK-UP When SPINDLE motor dose not turn Check the change for SPDO Voltage of Defective IC501...

  • Page 11: Waveforms Of Major Check Point

    ❏ WAVEFORMS OF MAJOR CHECK POINT #1. SPINDLE DRIVE AND MOTOR WAVEFORM #2. RF WAVEFORM IC501(21), IC504(12) during TOC reading 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 •...

  • Page 12: Internal Block Diagram Of Ics

    ❏ INTERNAL BLOCK DIAGRAM of ICs AV_CAR 1) Micom Port Assignment - 2-7 -...

  • Page 13

    2) Pin Descriptions - 2-8 -...

  • Page 14

    - 2-9 -...

  • Page 15

    BD3805F 1) BLOCK DIAGRAM - 2-10 -...

  • Page 16

    MN6627933CN(DSP) 1) Connection Diagram - 2-11 -...

  • Page 17

    TA8275HQ 1) Block Diagram - 2-12 -...

  • Page 18

    upd78f0546(Micom) 1) Block Diagram - 2-13 -...

  • Page 19

    2) Pin lay out - 2-14 -...

  • Page 20

    3) Pin Function PIN NAME Function Positive power supply except for ports ( except P20-P27 and P121-P124) and AD converter Ground potential except for ports (except P20-P27 and P121-P124) and AD converter EVDD Positive power supply for ports (expect p20-p27 and p121-p124) EVSS Ground potential for ports (except p20-p27 and p121-p124) RESET...

  • Page 21

    PIN NAME Function P62/EXSCL0 I/O port (N-ch open drain) External clock input for serial interface (IIC0) I/O port (N-ch open drain) P64-P67 I/O ports P70-P77 I/O ports /KR0-KR7 Key interrupt input P120 I/O port /INTP0 External interrupt request input with specifiable vaild edges /EXLVI Reference voltsge input for low voltage indicator P121...

  • Page 22: Block Diagram

    ❏ BLOCK DIAGRAM 2-17 2-18...

  • Page 23

    ❏ SCHEMATIC DIAGRAMS • MAIN SCHEMATIC DIAGRAM 2-19 2-20...

  • Page 24: Schematic Diagrams

    • MAIN-2 SCHEMATIC DIAGRAM 2-21 2-22...

  • Page 25

    • FRONT SCHEMATIC DIAGRAM 2-23 2-24...

  • Page 26

    • CD SCHEMATIC DIAGRAM 2-25 2-26...

  • Page 27

    ❏ PRINTED CIRCUIT BOARD DIAGRAMS • MAIN P.C. BOARD DIAGRAM 2-27 2-28...

  • Page 28

    • FRONT/TRIM P.C. BOARD DIAGRAM • LED P.C. BOARD 2-29 2-30...

  • Page 29

    • CD P.C. BOARD 2-31 2-32...

  • Page 30: Cabinet And Main Frame Section

    SECTION 3. EXPLODED VIEWS ❏ CABINET AND MAIN FRAME SECTION *Accessory...

  • Page 31: Mechanism (pick-up)

    ❏ MECHANISM (PICK-UP)

This manual also for:

Lac-m1600, Lac-m1600r, Lac-m6600(r)

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