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LG LPC-M140A Service Manual

Portable cd cassette recorder
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P/NO : 3829RGT008F
OCTOBER, 2007
PORTABLE CD
CASSETTE RECORDER
SERVICE MANUAL
NOTICE
This S/M developed for the SVC of the unit which is indicated with
the "SVC Model No. : LPC-M140N" in the Main Label.
MODEL: LPC-M140A/X
Internal Use Only
Website http://biz.lgservice.com

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Summary of Contents for LG LPC-M140A

  • Page 1 Internal Use Only Website http://biz.lgservice.com PORTABLE CD CASSETTE RECORDER SERVICE MANUAL NOTICE This S/M developed for the SVC of the unit which is indicated with the “SVC Model No. : LPC-M140N” in the Main Label. P/NO : 3829RGT008F OCTOBER, 2007 MODEL: LPC-M140A/X...

  • Page 2: Table Of Contents

    ❍ SECTION 4. REPLACEMENT PARTS ....... 4-1 Copyright © 2007 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 - 1-2 - Copyright © 2007 LG Electronics. Inc. All right reserved. 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 © 2007 LG Electronics. Inc. All right reserved. - 1-3 - LGE Internal Use Only 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 - 1-4 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 6: Specification

    125 - 8000Hz Signal to Noise Ratio 35/40dB (REC/PLAY) Designs and specifications are subject to change without notice for improvement. Copyright © 2007 LG Electronics. Inc. All right reserved. - 1-5 - LGE Internal Use Only Only for training and service purposes...

  • Page 7: Identifications Ofcontrols

    • CD FORWARD SKIP//SEARCH ( button • CD REPEAT button • CD STOP (I)button • CD PLAY//PAUSE ( ) button LGE Internal Use Only - 1-6 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 8: Rear Panel

    ): 3.5mm CD TRACK NUMBER indicator AC POWER INPUT SOCKET CD SYNCHRONIZED RECORDING indicator CD REPEAT PLAY indicator Copyright © 2007 LG Electronics. Inc. All right reserved. - 1-7 - LGE Internal Use Only Only for training and service purposes...
  • Page 9 LGE Internal Use Only - 1-8 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 10: Adjustment

    ADJUST FOR TAPE SPEED MTT-111N 3000±90Hz AZIMUTH ADJUST MTT114 DECK MECHA ADJ. HOLE GAIN MAXIMUM RECORDING BIAS 55kHz±500Hz L203 Copyright © 2007 LG Electronics. Inc. All right reserved. - 2-1 - LGE Internal Use Only Only for training and service purposes...

  • Page 11: Troubleshooting Guide

    Check tracking servo circuitry Tracking servo check Does it play? Is audio output PN702 1, 4pin check supplied? LGE Internal Use Only - 2-2 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 12 IC401 pin11? TRACKING ERROR wareform. Is HF signal normal without dropout? Is rotation normal? IC401 defective. PICK-UP defective. Copyright © 2007 LG Electronics. Inc. All right reserved. - 2-3 - LGE Internal Use Only Only for training and service purposes...
  • Page 13 Flow laser current? Defective laser and/or Both voltage of R400 is about 1.0? « R400 1.0V connector. LGE Internal Use Only - 2-4 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 14 • Connecter short • IC401 defective. • Laser diode degraded Is IC401 pin8 SEL signal output? • Pick-up defective Copyright © 2007 LG Electronics. Inc. All right reserved. - 2-5 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 IC101 pin6? Q102? Q101, 102 check IC101 Does signal come out at check pin13, 14? SW 702 check LGE Internal Use Only - 2-6 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 16 R203, L204, Does departure signal go L203 check into pn201, pin1, 3 HEAD connector check Copyright © 2007 LG Electronics. Inc. All right reserved. - 2-7 - LGE Internal Use Only Only for training and service purposes...
  • Page 17 0.125usec MICOM (IC400) pin52, 53, 54, 55 output wareform normal? • Pattern defective 3.3V • LCD light defective LGE Internal Use Only - 2-8 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 18: Interal Block Diagram Of Ics

    ❏ INTERAL BLOCK DIAGRAM OF ICs I TA2175FN (RF AMP) • BLOCK DIAGRAM Copyright © 2007 LG Electronics. Inc. All right reserved. - 2-9 - LGE Internal Use Only Only for training and service purposes...
  • Page 19 I TC94A58FAG/FB(DSP) • PIN CONNECTOINS LGE Internal Use Only - 2-10 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 20: Block Diagram

    • BLOCK DIAGRAM Copyright © 2007 LG Electronics. Inc. All right reserved. - 2-11 - LGE Internal Use Only Only for training and service purposes...
  • Page 21 9 10 11 12 13 14 HSOP-26D (TOP VIEW) Bias ch2-IN ch2-OUT+ ch4-IN ch2-OUT- ch4-OUT+ SubGND ch4-OUT- SubGND LGE Internal Use Only - 2-12 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 22 I TA2111N(AM/FM) • BLOCK DIAGRAM I UTCA8227P(POWER) • BLOCK DIAGRAM Copyright © 2007 LG Electronics. Inc. All right reserved. - 2-13 - LGE Internal Use Only Only for training and service purposes...
  • Page 23 I AN7312(PLAY/REC) • BLOCK DIAGRAM LGE Internal Use Only - 2-14 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 24: Ic/Tr Voltage & Pin Description

    Analog reference voltage pin 1.6V RFZI RFRP zero-cross signal input pin 1.6V RFRP RF ripple signal input pin 0.7V 2-15 2-16 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 RFRP Signal amp output pin for track count 0.7V RFRPIN Signal generation amp input pin for track count 1.6V 2-17 2-18 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 26: Block Diagram

    ❏ BLOCK DIAGRAM (LPC-M140A/AX) 2-19 2-20 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 ❏ BLOCK DIAGRAM (LPC-M140A(D)) 2-21 2-22 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 28: Schematic Diagrams

    ❏ SCHEMATIC DIAGRAMS 1. MAIN SCHEMATIC DIAGRAM 2007. 06. 29 2-23 2-24 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 2. MP3 SCHEMATIC DIAGRAM 2007. 06. 29 2-25 2-26 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 30: Wiring Diagram

    ❏ WIRING DIAGRAM 2-27 2-28 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 ❏ PRINTED CIRCUIT DIAGRAM 1. MAIN P.C BOARD DIAGRAM 2. POWER P.C BOARD DIAGRAM 2-29 2-30 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 32: Section 3. Exploded Views

    SECTION 3. EXPLODED VIEWS CABINET AND MAIN FRAME SECTION T901 LEAF SW Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 33 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

This manual is also suitable for:

Lpc-m140x

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