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Internal Use Only
Website http://biz.lgservice.com
PORTABLE CD CASSETTE
RECORDER
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL.
P/NO : AFN62795896
NOVEMBER, 2008
MODEL : LPC-M155X , LPC12W

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   Summary of Contents for LG LPC-M155X

  • Page 1

    Internal Use Only Website http://biz.lgservice.com PORTABLE CD CASSETTE RECORDER SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN62795896 NOVEMBER, 2008 MODEL : LPC-M155X , LPC12W...

  • Page 2: Table Of Contents

    ....... . . 4-1 Copyright © 2008 LG Electronics. Inc. All right reserved.

  • Page 3: Servicing Precautions

    Take care not to use too much of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 1-2 - Only for training and service purposes...

  • Page 4

    7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin. Armband Resistor (1 Mohm) Resistor Conductive (1 Mohm) Sheet Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 1-3 - Only for training and service purposes...

  • Page 5: Esd Precautions

    THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 1-4 - Only for training and service purposes...

  • Page 6: Specifications

    Recording System 4 Tracks 2 channel stereo Frequency Response 125 - 8000 Hz Signal to Noise Ratio 40 dB Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 1-5 - Only for training and service purposes...

  • Page 7

    LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 1-6 - Only for training and service purposes...

  • Page 8: Section 2. Exploded Views

    EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. DECK CABLE1 MAIN POWER Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9

    LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 10

    • PACKING ACCESSORY SECTION 305 Power Cord Instruction Ass'y Packing Packing Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 2-5 - Only for training and service purposes...

  • Page 11

    LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 2-6 - Only for training and service purposes...

  • Page 12: Troubleshooting Guide

    IC101 pin6? Q102? Q101, 102 check Does signal come out at IC101 check pin13, 14? SW 702 check Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 3-1 - Only for training and service purposes...

  • Page 13

    Does L203 depart? Does departure signal go R203, L204, L203 check into pn201, pin1, 3 HEAD connector check LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 3-2 - Only for training and service purposes...

  • Page 14

    • X1 defective 0.125usec IC1 pin59, 60, 61, 62, output wareform normal? • Pattern defective 3.3V • LCD light defective Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 3-3 - Only for training and service purposes...

  • Page 15

    Check tracking servo circuitry Tracking servo check Does it play? Is audio output PN702 1, 4pin check supplied? LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 3-4 - Only for training and service purposes...

  • Page 16

    IC1 pin96? TRACKING ERROR wareform. Is HF signal normal without dropout? Is rotation normal? IC1 defective. PICK-UP defective. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 3-5 - Only for training and service purposes...

  • Page 17

    Flow laser current? Both voltage of R33 is Defective laser and/or about 1.0? « 1.0V connector. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 3-6 - Only for training and service purposes...

  • Page 18

    Is IC1 pin95 FEI signal output? • IC1 defective. • Laser diode degraded Is IC1 pin94 SBAD signal output? • Pick-up defective Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 3-7 - Only for training and service purposes...

  • Page 19: Interal Block Diagram Of Ics

    • BLOCK DIAGRAM BANDG AP REFERENCE PROTECTI ON OUTPUT O N/OFF CONTROL Contr ol OVER HEAT PROTECTI ON LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 3-8 - Only for training and service purposes...

  • Page 20: Block Diagram

    I MM1669AH • BLOCK DIAGRAM Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 3-9 - Only for training and service purposes...

  • Page 21

    I TA2111 • BLOCK DIAGRAM LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 3-10 - Only for training and service purposes...

  • Page 22

    MM1469 Analog Audio Output CD processor, MP3/WMA decoder, audio DAC and system controlling MCU TC94A77FG-203 16.9MHz Panel keys Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 3-11 - Only for training and service purposes...

  • Page 23

    • PIN ASSIGNMENT LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 3-12 - Only for training and service purposes...

  • Page 24

    I UTC7312 • BLOCK DIAGRAM I UTC8227 • TEST CIRCUIT Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 3-13 - Only for training and service purposes...

  • Page 25

    LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. - 3-14 - Only for training and service purposes...

  • Page 26: Wiring Diagram

    ❏ WIRING DIAGRAM 3-15 3-16 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 27

    ❏ BLOCK DIAGRAM 3-17 3-18 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 28: Schematic Diagrams

    ❏ SCHEMATIC DIAGRAMS 2007. 06. 12 3-19 3-20 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 29

    ❏ PRINTED CIRCUIT DIAGRAM MAIN P.C BOARD DIAGRAM 3-21 3-22 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

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Lpc12w

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