LG LM-U2350A Service Manual
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LG LM-U2350A Service Manual

3cd changer hi-fi system
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3CD CHANGER
HI-FI SYSTEM
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL.
MODEL: LM-U2350A, LMS-U2350
LM-U4050A, LMS-U4050, LMS-U4050W
LM-U5050A, LMS-U5050, LMS-U5050W, LMS-U5050S

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Summary of Contents for LG LM-U2350A

  • Page 1 3CD CHANGER HI-FI SYSTEM SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. MODEL: LM-U2350A, LMS-U2350 LM-U4050A, LMS-U4050, LMS-U4050W LM-U5050A, LMS-U5050, LMS-U5050W, LMS-U5050S...

  • Page 2: Table Of Contents

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

  • Page 3: Servicing Precautions

    SECTION 1. GENERAL ❏ SERVICING PRECAUTIONS I 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 I 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 I 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 MODEL LM-U5050 LM-U4050 LM-U2350 SECTION Power supply Refer to the back panel of the unit. Power consumption 200 W 110 W Weight 8.5 kg External dimensions (W x H x D) 280 x 370 x 400 mm Frequency response 40 - 18000 Hz Signal-to-noise ratio 75 dB...
  • Page 7 - 1-6 -...

  • Page 8: Electrical Troubleshooting Guide

    SECTION 2. ELECTRICAL ❏ ELECTRICAL TROUBLESHOOTING GUIDE I SMPS POWER CIRCUIT P-SENS PART SMPS ASSY CN902 © 7PIN 5.1V CHECK SMPS TROUBLESHOOTING CONSULT MAIN PCB CN710 7PIN 5.1V CHECK CN710 CONNECTION STATE CHECK MAIN PCB PATTERN CUTTING AND SHORT CHECK MAIN PCB CN304 5PIN 5.1VCHECK FRONT PN302 36PIN 5.1VCHECK FRONT IC306(RESET IC)
  • Page 9 MICOM (IC301) CHECK "P-SENS" CHECK P-SENS TROUBLESHOOTING CONSULT "RESET" IC304 11 PIN CHECK (HIGH © LOW © HIGH) Q303 STATE CHECK IC304 VDD(17,46,72,90) PIN VOLTAGE TR "Q303" CHANGE CHECK PN302 35 PIN +5.6V(MI) CHECK X301 VIBRATION SIGNAL CHECK MAIN CN710 6 PIN CHECK X301 CHANGE IC301 CHANGE SMPS TROUBLESHOOTING CONSULT...
  • Page 10 MUTING TROUBLESHOOTING (MUTE STATE) Q752(A102) BASE "HIGH" EXPEND IC(IC305) 5PIN HIGH STATE CHECK Q752(A102)STATE CHECK Q752(A102) FAULTY IS CHANGE Q701, Q751(D1302) BASE "HIGH" CHECK EACH PART TR CHANGE MUTE EXPEND IC(IC305/501/502) STATE 16 PIN VDD VOLTAGE CHECK D332/D553/D551(1SS133) CHECK 3 "EXP-CLK" CHECK D332/D553/D551(1SS133) CHANGE MICOM (IC304) 4/84/85 PIN...
  • Page 11 SPECIFIC FUNCTION MODE HAS NO SOUND (NJW1190) IC601 IC201 INPUT CHECK(HEAD INPUT)"A"DECK 32,39 "B"DECK 34,37 DECK HEAD WIRE CONNECTION STATE CHECK IC201 OUTPUT CHECK(5,26 PIN) IC502 10PIN(PB MUTE) STATE STATE CHECK IC601 3,36PIN INPUT SIGNAL CHECK IC502 4PIN(REC SW) "HIGH" IC502 4PIN(REC SW) "LOW"...
  • Page 12 JK601 SIGNALINPUT CHECK IC601 5,34 PIN SIGNALINPUTCHECK MAIN PCB PATTERN CHECK IC601 17,22 PIN OUTPUT SIGNAL CHECK IC601(NJW1190) TROUBLESHOOTING CONSULT AUX OUTPUT CN709 1,3PIN SIGNALCHECK CD TROUBLESHOOTINGCONSULT IC601 4,35PIN SIGNALINPUTCHECK MAIN PCB PATTERN CHECK IC601 17,22 PIN OUTPUT SIGNAL CHECK IC601(NJW1190) TROUBLESHOOTING CONSULT CD OUTPUT...
  • Page 13 TUNER TU101 3 /5 SIGNAL CHECK TU101 2 PIN "+9V" VOLTAGE CHECK IC601 2,37 PIN SIGNALINPUTCHECK TU101 6,7,8,9 PIN CHECK (PLL-CE, PLL-DI, CLK, PLL-DO) TUNER MODULE CHANGE IC601 17,22 PIN OUTPUT SIGNAL CHECK TUNER OUTPUT CN303 7 PIN "MIC-SIGNAL" CHECK <MIC PCB>...
  • Page 14 IC601(NJW1190) TROUBLESHOOTING IC601 24PIN VOLTAGE INPUT CHECK SMPS VOLTAGE CHECK CONSULT IC601 19,20 SDA, SCA PULSE WAVE CHECK (VOL UP, DOWN TURN CHECK) IC301 10,8PIN CHECK FUNCTION INPUT PORT SIGNAL IC301 TROUBLESHOOTING CHECK(NJW1190 TROUBLESHOOTING) IC601 CHANGE IC601 17.22 PIN WAVE OUTPUT CHECK IC601 OK AMP MODULE TROUBLESHOOTING IC501 9 PIN(AMP-PWR)HIGH CHECK...
  • Page 15 IC701 9 ,14 ±9V CHECK SMPS TROUBLESHOOTING CONSULT IC701 10 , 13 INPUT SIGNAL CHECK IC701 5 ,17 OUTPUT SIGNAL CHECK REC CHECK (Q252,Q202 ON :R273,R223 HIGH) IC601 24PIN VOLTAGE INPUT CHECK IC401 EACH INPUTTUNER6,39.TAPE. 7.38.CD. 8.38.AUX.9.36 PIN SIGNAL INPUT CHECK REC INPUTCHECK CHECK IC201 7,24 PIN INPUT CHECK INPUT LINE CHECK...
  • Page 16 DUBBING CHECK ("NORMAL OR REC"//"HIGH") IC401 11,34 OUTCHECK IC401 EACH INPUTTUNER6,39.TAPE. 7.38.CD.8.38.AUX.9.36PIN SIGNAL INPUT CHECK REC INPUTCHECK CHECK IC201 7,24 PIN INPUT CHECK INPUT LINE CHECK IC201 10.21PIN OUTPUT CHECK - 2-9 -...

  • Page 17: Internal Block Diagram Of Ics

    ❏ INTERNAL BLOCK DIAGRAM of ICs • HA12237F BLOCK DIAGRAM - 2-10 -...
  • Page 18 • NJW1190 BLOCK DIAGRAM • AF330W20FS BLOCK DIAGRAM - 2-11 -...
  • Page 19 PIN CONFIGURATION PIN DESCRIPTION Pin Number Symbol Type Description L_DO L-Channel Drain Output SUBGND Sub Ground VDD_L L-Channel Positive supply Voltage L_GND L-Channel Signal Ground VSS_L L-Channel Negative supply Voltage L_OUT L-Channel Audio Output AM_F1 AM Mode control Input 1 L_CS L-Channel Current Sense Input Positive supply Voltage...
  • Page 20 • AF350W01FS BLOCK DIAGRAM PIN CONFIGURATION - 2-13 -...
  • Page 21 PIN DESCRIPTION Pin Number Symbol Type Description N_DO NMOS Drain Output Negative supply Voltage N_CS NMOS Current Sense Input P_CS PMOS Current Sense Input Negative supply Voltage STANDBY ON/OFF control Audio Input P_STATE Protection State Positive supply Voltage Audio Output Signal Ground SUBGND Sub Ground...

  • Page 22: Block Diagram

    ❏ BLOCK DIAGRAM 2-15 2-16...
  • Page 23 ❏ WMA_USB BLOCK DIAGRAM 2-17 2-18...
  • Page 24 ❏ SCHEMATIC DIAGRAMS • FRONT SCHEMATIC DIAGRAM 2-19 2-20...
  • Page 25 • MAIN SCHEMATIC DIAGRAM 2-21 2-22...

  • Page 26: Schematic Diagrams

    • DECK SCHEMATIC DIAGRAM 2-23 2-24...
  • Page 27 • MIC SCHEMATIC DIAGRAM 2-25 2-26...
  • Page 28 • USB_AUX2_H/P SCHEMATIC DIAGRAM 2-27 2-28...
  • Page 29 • WOOFER AMP SCHEMATIC DIAGRAM 2-29 2-30...
  • Page 30 • AMP SCHEMATIC DIAGRAM 2-31 2-32...
  • Page 31 • POWER SCHEMATIC DIAGRAM 2-33 2-34...
  • Page 32 • POWER SCHEMATIC DIAGRAM 2-35 2-36...
  • Page 33 • SUB POWER SCHEMATIC DIAGRAM 2-37 2-38...
  • Page 34 • CDP SCHEMATIC DIAGRAM 2-39 2-40...
  • Page 35 • USB SCHEMATIC DIAGRAM 2-41 2-42...
  • Page 36 ❏ WIRING DIAGRAMS 2-43 2-44...

  • Page 37: Printed Circuit Diagrams

    ❏ PRINTED CIRCUIT DIAGRAMS • MAIN P.C. BOARD 2-45 2-46...
  • Page 38 • MAIN AMP P.C. BOARD 2-47 2-48...
  • Page 39 • MAIN AMP P.C. BOARD 2-49 2-50...
  • Page 40 • FRONT P.C. BOARD 2-51 2-52...
  • Page 41 • CDP P.C. BOARD 2-53 2-54...
  • Page 42 • CDP P.C. BOARD 2-55 2-56...
  • Page 43 • POWER P.C. BOARD 2-57 2-58...
  • Page 44 • POWER P.C. BOARD 2-59 2-60...
  • Page 45 • SUB POWER P.C. BOARD 2-61 2-62...
  • Page 46 • WOOFER AMP P.C. BOARD 2-63 2-64...
  • Page 47 2-65 2-66...

  • Page 48: Cabinet And Main Frame Section

    SECTION 3. EXPLODED VIEWS Caution point • CABINET AND MAIN FRAME SECTION A50: Headphone + MIC + USB + Main array assembly pcb. *OPTION...

  • Page 49: Tape Deck Mechanism (A/R & A/S : Right A/R Deck)

    • TAPE DECK MECHANISM (A/R & A/S : RIGHT A/R DECK) LOCA. NO. LG PART NO. DESCRIPTION SPECIFICATION 6720AG0009A DECK,AUDIO CWN42RR05 TOKYO PIGEON L-DOUBL 6768R-UP04A DECK MECHANISM PARTS 50-093-41285 PIGEON UNIT 6768R-EP05A DECK MECHANISM PARTS 50-093-41234 PIGEON HEAD ASSY 6768R-BP03D...
  • Page 50 • TAPE DECK MECHANISM (A/R & A/S : LEFT A/R DECK) LOCA. NO. LG PART NO. DESCRIPTION SPECIFICATION 6720AG0009A DECK,AUDIO CWN42RR05 TOKYO PIGEON L-DOUBL 6768R-UP04A DECK MECHANISM PARTS 50-093-41285 PIGEON UNIT 6768RZEP04A DECK MECHANISM PARTS 50-093-41238 PIGEON A/R A/R HE...

  • Page 51: Cd Mechanism

    • CD MECHANISM LOCA.NO. PART NO DESCRIPTION SPECIFICATION 4405RCE008G MECHANISM ASSEMBLY CDM-H1543 3 CD CHANGER (SPRING 3041RBM001A BASE ASSEMBLY PU(SPRING DAMPER) SS P/UP 6717R-A002A PICK UP ASSEMBLY CMS-D77SG6 SAMSUNG FRONT LOADI 3390RB0002A TRAY DISC(CDM-H1503) 4470RB0005A GEAR TRAY (CDM-H1503) 4681RBA001C MOTOR ASSEMBLY HOME TRAY (CDM-H1503) MABUCHI 6871RF9211A PWB(PCB) ASSEMBLY,FRONT...
  • Page 52 SECTION 4. SPEAKER SECTION ❏ MODEL: LMS-U2350, LMS-U4050, LMS-U5050 - 4-1 -...
  • Page 53 ❏ MODEL: LMS-U5050W, LMS-U4050W - 4-2 -...
  • Page 54 ❏ MODEL: LMS-U5050S - 4-3 -...
  • Page 55 - 4-4 -...

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Lms-u2350Lms-u4050Lms-u4050wLm-u5050aLms-u5050Lms-u5050w ... Show all

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