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LG LPC-LM440A/X Service Manual

Mp3/cd logic deck.
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MP3/CD LOGIC DECK
CASSETTE RECORDER
SERVICE MANUAL
MODEL: LPC-LM440A/X
LPC-LM445A/X

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   Summary of Contents for LG LPC-LM440A/X

  • Page 1

    MP3/CD LOGIC DECK CASSETTE RECORDER SERVICE MANUAL MODEL: LPC-LM440A/X LPC-LM445A/X...

  • Page 2

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

  • Page 3: Servicing Precautions

    SECTION 1. GENERAL ❏ SERVICING PRECAUTIONS NOTES REGARDING HANDLING OF THE PICK-UP 1. Notes for transport and storage 1) The pick-up should always be left in its conductive bag until immediately prior to use. 2) The pick-up should never be subjected to external pressure or impact. Storage in conductive bag Drop impact 2.

  • Page 4

    NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations 1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components can be damaged, and for that reason components should be handled with care.

  • Page 5: 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 6: Specification

    ❏ SPECIFICATIONS LPC-LM440A MODEL SECTION LPC-LM445A Power supply Refer to the back panel of the unit. Power consumption Mass 5.1kg External dimensions (W x H x D) 456 x 178 x 338 mm Output Power 5W X 2 , 10W Speakers 3.2Ω...

  • Page 7: Identifications Ofcontrols

    ❏ IDENTIFICATIONS OF CONTROLS Front Front - 1-6 -...

  • Page 8

    Rear Panel Bottom Panel Remote Control - 1-7 -...

  • Page 9

    - 1-8 -...

  • Page 10: Adjustment

    SECTION 2. ELECTRICAL ❏ ADJUSTMENTS 1.TAPE DECK ADJUSTMENT DECK MODE TEST TAPE TEST POINT ADJUSTMENT ADJUST FOR PLAY BACK MTT-114 L/R Output Azimuth adjusting screw L/R Maximum 2.RECORD BIAS ADJUSTMENT DECK MODE TEST TAPE TEST POINT ADJUSTMENT ADJUST FOR AUTO-RVS 75KHz±5KHz C465 OR C415(DECK REC MODE...

  • Page 11: Troubleshooting Guide

    ❏ TROUBLESHOOTING GUIDE • CD PART TURN ON CD OPEN CLOSE CHECK CONNECTOR CHECK (PN813) “READING” DISPLAY CHECK CONNECTOR CHECK (PN802,PN806) CHECK MICOM INTERFACE CIRCUIT (PN805) READING OK CHECK CONNECTOR CHECK (PN801) CHECK PICKUP MOVEMENT CHECK AM5810FP (IC802) CHECK LC78690N (IC801) IF PLAY, AUDIO OUTPUT CHECK CONNECTOR CHECK...

  • Page 12

    OPEN COLOSE NG DOOR OPEN/CLOSE OPEN/CLOSE S/W CHECK DISLPLAY CHECK CONNECTOR LOCKING CHECK (PN813) MAIN B`D CHECK AD 5V CHECK(PN805 Pin3) Q102 “C ”© 4.6V) Check Q101 “B ”4.5V “READING ”DISLPAY CHECK (=ONLY “CD ”DISPLAY) CONNECTOR LOCKING CHECK (PN801,PN805,PN802,PN806) CHECK POWER SUPPLY DEFECTIVE CONNECTOR OR (MAIN PN251) MAIN POWER SUPPLY...

  • Page 13

    READING OK CHECK (=“NO DISC ”DISPLAY) CONNECTOR LOCKING CHECK(PN801) DOES SLED MOVE? CHECK PN802 Pin3,4 DEFECTIVE PICKUP OR (SL+,SL-) IC802 OR IC801 DOSE LENSE MOVE? (UP&DOWN) CHECK PN801 Pin13,16 DEFECTIVE PICKUP OR (FA-,FA+) IC802 OR IC801 DOSE LASER LIGHT? DEFECTIVE PICKUP OR CHECK PN801 Pin10(LD) IC801 OR Q801 DOES SPINDLE ROTATE?

  • Page 14

    READING OK CHECK #A(=“NO DISC ”DISPLAY) DOSE SL+WAVEFORM APPEAR AT(IC802 Pin13 ) SLED MOTOR WAVE DOSE SLIN WAVEFORM DEFECTIVE IC801 APPEAR AT (IC802 Pin5) DRIVE WAVE DEFECTIVE IC802 CHECK PN802 DEFECTIVE PN802 CONNECTOR LINE CONNECTOR DEFECTIVE PICK-UP SLED MOTOR - 2-5 -...

  • Page 15

    READING OK CHECK #B(=“NO DISC ”DISPLAY) DOSE FA+WAVEFORM APPEAR AT(IC802 Pin16 ) FOCUS COIL DRIVE WAVE DOSE FAIN WAVEFORM DEFECTIVE IC801 APPEAR AT (IC802 Pin22) DRIVE WAVE DEFECTIVE IC802 CHECK PN801 DEFECTIVE PN801 CONNECTOR LINE CONNECTOR DEFECTIVE PICK-UP FOCUS ACTUATOR - 2-6 -...

  • Page 16

    READING OK CHECK #C(=“NO DISC ”DISPLAY) Q801 VOLTAGE CHECK .1.96V Q801 EMITTER VOLTAGE DEFECTIVE IC801 CHECK .3.1V O.K LASER CONTROL DEFECTIVE IC801 VOLTAGE CHECK IC801 Pin 18.2.45 DEFECTIVE Q801 CHECK PN801 DEFECTIVE PN801 CONNECTOR LINE CONNECTOR DEFECTIVE PICK-UP FOCUS ACTUATOR - 2-7 -...

  • Page 17

    READING OK CHECK #D(=“NO DISC ”DISPLAY) DOSE SP+WAVEFORM APPEAR AT(IC802 Pin11) SPINDLE MOTOR DRIVE WAVE DEFECTIVE IC801 DOSE SPIN WAVEFORM APPEAR AT (IC802 Pin6) SPINDLE DRIVE WAVE DEFECTIVE IC802 CHECK PN802 DEFECTIVE PN802 CONNECTOR LINE CONNECTOR DEFECTIVE PICK-UP SPINDLE MOTOOR - 2-8 -...

  • Page 18

    READING OK CHECK #E(=“NO DISC ”DISPLAY) DOSE TA+WAVEFORM APPEAR AT(IC802 Pin17 ) TRACKING COIL DRIVE WAVE DEFECTIVE IC801 DOSE TAIN WAVEFORM APPEAR AT (IC801 Pin23) TRACKING DRIVE WAVE DEFECTIVE IC802 CHECK PN801 DEFECTIVE PN801 CONNECTOR LINE CONNECTOR DEFECTIVE PICKUP DOSE RF SIGNAL APPEAR? OR IC801 (IC801 PORT2) WAVEFORM#6...

  • Page 19

    • MAIN POWER Main Power input (AC-cord in) Check the Voltage-selector LCD Display ”Hello” 110V/230V (Duble Voltage only) Check the DC out Check the Fuse Replace the Fuse of C202(+) Check theD901,D902, Replace D201,D202,D203D204 D903,D904(POWER B`D) Q251 Emittor Voltage REPLACE Q251 Check(.9.6V) IC271 Vout Voltage Check(.5.2V) REPLACE IC271...

  • Page 20

    • MUTING CIRCUIT(MUTE) Dose “HIGH ”appear at Check the “HIGH ”of the Check the IC101 Q601,Q651,Q256(SUB-W)“B ” IC101 Pin 9,47 Check the pattern Check the “LOW ”of Q601, Replace the Q601,Q651, Q605,Q256 “E ” Q256 MUTE • FUNCTION MODE AUDIO ABNORMAL TAPE FUNCTION Check the signal input of IC301 Pin 3,26...

  • Page 21

    • IC301 TROUBLESHOOTING Check the Power supplying to Check the DC Output of IC301 pin 1 Q301(.6.8V) Check the CLK Data of Check the Data of Check the IC101 IC301 pin 14,15 IC101 pin 6,7 CD °˙TAPE Function) Check the Pattern Check the IC101 Function Replace the IC301 Selector...

  • Page 22

    • TUNER PACK TROUBLESHOOTING Check the Tuner Power of Check the DC output of Check the “high ” PN403 Pin 2 “Tu-B+” “HIGH ”Q231 “C ” Q232 “B ” Check the DC output Q233 “E ”,pattern CE :Chip Emable DI :Data Input(From u-com) DO :Data Output(to u-com) CLK :Tuner Mode Clock Replace Tuner pack or...

  • Page 23

    • TAPE TROUBLESHOOTING 1) Play Check the power supplying to Check the DC output Check the “high ” IC401 Pin16 Q241 “C ” IC101 Pin92 or Q242 “B ” Check the pattern Q405 “C ”Voltage Check(8.5V) PN402 Pin 3 Voltage Check(12.5V) © Q407,Q489 Check PN402 Pin1 Pin2 Check(Normal Speed:Q483,+10%:Q481,-10%:Q485)

  • Page 24

    2) REC Check signal out of Check signal in from IC301 Replace IC301 IC401 Pin 10,21 IC301 Pin 7,22) Check the signal of IC401 Replace IC401 Pin 7,24 OR Pattern Is the normal? Check REC_B+Voltage(9V) Check Q211 “E ” Voltage(9V) Check Q211 “E ”...

  • Page 25

    • POWER IC TROUBLESHOOTING 1)2CH(L/R) Check Signal in Check Signal in Check the IC301 Pin12, Check the IC301 Pin12, Check Q252,Q253 Check Q252,Q253 IC901 Pin6,Pin8 IC901 Pin6,Pin8 Pin17 Pin17 Check IC 901 PIN10(Mode1) © Check Micom port 99(Mode1_control)©”0.6V ” MAIN Vcc Check Q271,Q272 Check IC 901 PIN11(SVR) ©...

  • Page 26: Interal Block Diagram Of Ics

    ❏ INTERAL BLOCK DIAGRAM OF ICs I TDA8947J • BLOCK DIAGRAM - 2-17 -...

  • Page 27

    • PINNING INFORMATION OUT1+ GND1 OUT2- Mode 2 IN2+ SGND TDA8947J IN1+ IN3+ Mode 1 IN4+ OUT3- GND2 OUT4+ Table 3: Pin description Symbol Description OUT1+ non inverted loudspeaker terminal 1 GND1 ground channel 1 supply voltage channel 1 OUT2- inverted loudspeaker terminal 2 Mode 2 mode selection of subwoofer (channel 3/4)

  • Page 28

    I TDA7468D • BLOCK DIAGRAM - 2-19 -...

  • Page 29

    • PIN CONNECTION I HA12237F • BLOCK DIAGRAM - 2-20 -...

  • Page 30

    I AM5810(Motor Driver ICs) • BLOCK DIAGRAM • PIN CONFIGURATION - 2-21 -...

  • Page 31

    • PIN DESCRIPTION - 2-22 -...

  • Page 32: Ic/tr Voltage & Pin Description

    ❏ IC/TR VOLTAGE & PIN DESCRIPTION - 2-23 -...

  • Page 33

    - 2-24 -...

  • Page 34

    - 2-25 -...

  • Page 35

    - 2-26 -...

  • Page 36: Block Diagram

    ❏ BLOCK DIAGRAM 2-27 2-28...

  • Page 37

    ❏ SCHEMATIC DIAGRAMS • MAIN SCHEMATIC DIAGRAM 2-29 2-30...

  • Page 38: Schematic Diagrams

    • MICOM SCHEMATIC DIAGRAM 2-31 2-32...

  • Page 39

    • KEY SCHEMATIC DIAGRAM 2-33 2-34...

  • Page 40

    • POWER SCHEMATIC DIAGRAM 2-35 2-36...

  • Page 41

    • DECK SCHEMATIC DIAGRAM 2-37 2-38...

  • Page 42

    • CHIP WMA MODULE SCHEMATIC DIAGRAM 2-39 2-40...

  • Page 43: Wiring Diagram

    ❏ WIRING DIAGRAM 2-41 2-42...

  • Page 44

    ❏ PRINTED CIRCUIT DIAGRAM • MAIN P.C. BOARD 2-43 2-44...

  • Page 45

    • FRONT P.C. BOARD 2-45 2-46...

  • Page 46

    • CDP P.C. BOARD (COMPONENT SIDE) 2-47 2-48...

  • Page 47

    • CDP P.C. BOARD (SOLDER SIDE) 2-49 2-50...

  • Page 48

    • POWER P.C. BOARD 2-51 2-52...

  • Page 49: Section 3. Exploded Views

    SECTION 3. EXPLODED VIEWS NOTE) Refer to SECTION 4 REPLACE- MENT PARTS LIST in order to look for the part number of each part. CAUTION Exposed blade will cause severe injury.

  • Page 50

    • DECK MECHANISM (LPC-LM440) LOCA.NO. PART NO. DESCRIPTION SPECIFICATION 6720AF0013A DECK,AUDIO CFM3211 TOKYO PIGEON L-SINGLE 6768RZQP01A DECK MECHANISM PARTS 50-093-41144 PIGEON CST MOTOR( 6768R-JP03A DECK MECHANISM PARTS 50-093-4674 PIGEON PULLEY/FLYW 6768RZGP002A DECK MECHANISM PARTS 50-093-41136 PIGEON GEAR ASSY CLUTCH 6768R-AP01C DECK MECHANISM PARTS 50-239-4072 PIGEON ARM CWL44 6768R-GP01J...

  • Page 51

    • DECK MECHANISM (LPC-LM445) LOCA.NO. PART NO. DESCRIPTION SPECIFICATION 6720AF0014A DECK,AUDIO CRM3213 TOKYO PIGEON L-SINGLE 6768RZQP01A DECK MECHANISM PARTS 50-093-41144 PIGEON CST MOTOR 6768R-JP03A DECK MECHANISM PARTS 50-093-4674 PIGEON PULLEY/FLYW 6768RZGP002A DECK MECHANISM PARTS 50-093-41136 PIGEON GEAR ASSY CLUTCH 6768R-AP01C DECK MECHANISM PARTS 50-239-4072 PIGEON ARM CWL44 6768R-GP01J...

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Lpc-lm445a/x

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