1. Manuals
  2. Brands
  3. LG Manuals
  4. Stereo System
  5. LM-K2930A
  6. Manual

LG LM-K2930A Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
• SERVICING PRECAUTIONS .................................................................................................................... 1-2
• ESD PRECAUTIONS ................................................................................................................................. 1-4
• SPECIFICATIONS ..................................................................................................................................... 1-5
• ADJUSTMENTS ......................................................................................................................................... 2-1
• TROUBLESHOOTING ............................................................................................................................... 2-3
• BLOCK DIAGRAM ................................................................................................................................... 2-13
• SCHEMATIC DIAGRAMS ........................................................................................................................ 2-15
• WIRING DIAGRAM .................................................................................................................................. 2-25
• PRINTED CIRCUIT DIARGAMS .............................................................................................................. 2-27
SECTION 3. DVD KARAOKE PART
• KARAOKE TROUBLESHOOTING ............................................................................................................. 3-1
• REPAIRS REGARDING CD MECHANISM ............................................................................................. 3-16
• SCHEMATIC DIAGRAMS ........................................................................................................................ 3-17
• IC VOLTAGE SHEET ................................................................................................................................ 3-29
• PRINTED CIRCUIT DIAGRAMS ............................................................................................................... 3-33
• CABINET AND MAIN FRAME SECTION ................................................................................................... 4-1
• TAPE DECK MECHANISM (A/R & A/S : LEFT A/S DECK) ........................................................................ 4-3
• TAPE DECK MECHANISM (A/R & A/S : RIGHT A/R DECK) ..................................................................... 4-5
• CD MECHANISM ........................................................................................................................................ 4-7
SECTION 5. SPEAKER .................................................................................................................. 5-1
SECTION 6. REPLACEMENT PARTS LIST ................................................................................... 6-1
CONTENTS
- 1-1 -

Advertisement

Table of Contents
loading

Related Manuals for LG LM-K2930A

Summary of Contents for LG LM-K2930A

  • Page 1: Table Of Contents

    CONTENTS SECTION 1. GENERAL • SERVICING PRECAUTIONS ........................1-2 • ESD PRECAUTIONS ..........................1-4 • SPECIFICATIONS ............................. 1-5 SECTION 2. AUDIO PART • ADJUSTMENTS ............................2-1 • TROUBLESHOOTING ..........................2-3 • BLOCK DIAGRAM ........................... 2-13 • SCHEMATIC DIAGRAMS ........................2-15 •...

  • Page 2: Section 1. General

    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 3 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 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 NOTE : Specification are subject to change without notice in the course of product improvement. - 1-5 -...
  • Page 6 MEMO - 1-6 -...

  • Page 7: Section 2. Audio Part

    SECTION 2. AUDIO PART ADJUSTMENTS This set has been aligned at the factory and normally will not require further adjustment. As a result, it is not recommended that any attempt is made to modificate any circuit. If any parts are replaced or if anyone tampers with the adjustment, realignment may be necessary.
  • Page 8 3. RECORD BIAS ADJUSTMENT Deck Mode Test Tape Test Point Adjustment Adjust for ERASE HEAD 60kHz±5kHz (Auto stop) Rec/Pause MTT-5511 L401 WIRE(PN202) 85kHz±5kHz(Auto Reverse) Record/Playback PN202 Frequency Counter Head and Pause Mode Test Tape Unit MTT-5511 Record/Playback head Figure 3. Record Bias Adjustment Connection Diagram - 2-2 -...

  • Page 9: Troubleshooting

    AUDIO PART TROUBLESHOOTING REC (Q252, Q202 ON / R273, R223 High) Check signal supplied to IC202 pin 11, 14? Check the “Low” of Q253, Q203 “B” Refer to “IC203 Troubleshooting” Replace the Q253, Q203 Check the output of IC202 Pin9, 16 Check the Vcc power of IC202 Pin18 Check the IC201 pin6 : 12V and pin 4 : High Check the power or Refer to “IC203...
  • Page 10 Dubbing(“NORMAL or REC “//“HIGH”) Q252, 202 “OFF”//“ON” : R273, 223 “LOW”//“HIGH Q253, 203 “ON”//“OFF” Refer to “IC203 Troubleshooting” Refer to “REC Troubleshooting” P- SENS PART Does +5V appear at ZD900 Check the waveform of D907 Check the Voltage of IC301 PIN 26 Replace D907 Check the R902 and replace ZD900 VKK PART...
  • Page 11 POWER CIRCUIT Check the Fuse Replace the Fuse Check the DC output of IC700 PIN 11(- VCC), 12(+ VCC) Check the DC Output of PN900 PIN 1,5 Replace D900 Check the AC Output of PN900 PIN 2,3 Replace Transformer Check the DC +12 Output of CN901 PIN5 Check the DC +16V (Higher) of CN901 PIN 6,7...
  • Page 12 << CD/ DVD/ KARAOKE FUNCTION>> Check the DVD- CONTROL "HIGH" of CN901 PIN 9 Check the POWER- CONTROL "HIGH" of IC301 PIN 81 Check the PATTERN Check the PATTERN Check the +8V( AC) of CN901 PIN 11 Check the DC +16V (Higher) of CN901 PIN 6,7 Check the AC of D901 Check the +12V( DC)
  • Page 13 MUTING CIRCUIT (MUTE) Check the "HIGH" of IC301 PIN95 (F- MUTE) Check the Muting mode and Replace IC301 Check the "HIGH" of Q791 "C" PORT Check the "HIGH" of Q791 "E" PORT Check the PATTERN Replace Q791 Check the SIGNAL of Q700, Q750 "C"...
  • Page 14 Check the "HIGH" of IC301 PIN92 (C- MUTE) Check the Muting mode and Replace IC301 Check the "HIGH" of Q793 "C" PORT Check the "HIGH" of Q793 "E" PORT Check the PATTERN Replace Q793 Check the SIGNAL of Q1750 "C" PORT Replace Q1750 Check the "HIGH"...
  • Page 15 AUDIO ABNORMAL FUNCTION MODE AUDIO ABNORMAL - 2-9 -...
  • Page 16 IC301 U- COM IC TROUBLESHOOTING Check the +5V of IC301 PIN17,46,90,72 Check the DC+ 5.6V of CN300 PIN 29 Refer to POWER Circuit Troubleshooting Check the PATTERN Check the 5V Input of IC301 PIN26 (POWER- SENS.) Refer to P- SENS Troubleshooting Check the oscillation of X301 Check the RESET Circuit...
  • Page 17 IC700(AMP IC) TROUBLESHOOTING Check the SIGNAL Input of PIN 1,3,20,24,25 Refer to Muting Troubleshooting Check the POWER of PIN 11 (-) , 12(+) Refer to POWER Circuit Troubleshooting Check the SIGNAL Output of PIN 5,6,7,8,13,14,15,16,27,28 Check the DC of PIN 5,6,7,8,13,14,15,16,27,28 Replace POWER IC PLAY...
  • Page 18 MEMO - 2-12 -...
  • Page 19 SECTION 3. DVD KARAOKE PART ❐ KARAOKE TROUBLESHOOTING • Power (SMPS) Circuit A. No Power - 3-1 -...
  • Page 20 B. Audio abnormal C. Video abnormal AUDIO ABNORMAL VIDEO ABNORMAL Check Audio jack. Check Video jack. YES (If OK) YES (If OK) Check PLL FC of MPEG part. Refer to Video part. YES (If OK) YES (If OK) Refer to Audio part. Refer to Encoder part.
  • Page 21 E. Picture abnormal F. Disc Error PICTURE ABNORMAL DISC ERROR Check the disc. Check Disc YES (If OK) Refer to Servo part Refer to Servo part If OK YES (If OK) Check PLL IC of MPEG part Replace B/D YES (If OK) Check DSP YES (If OK) Check MPEG...
  • Page 22 • MPEG Circuit - 3-4 -...
  • Page 23 • RF/Servo Circuit - 3-5 -...
  • Page 24 - 3-6 -...
  • Page 25 - 3-7 -...
  • Page 26 - 3-8 -...
  • Page 27 • Audio signal KARAOKE A KARAOKE AUDIO. IC600 Pin 49 input check? · IC409 defective. · IC409 Pin 2 defective. IC600 Pin 17 RESET check? RESET surrounding circuitry defective. IC601 DATA LINE ADRS LINE check? defective. IC600 Pin 11, 12, 13 output IC600 defective.
  • Page 28 • DVD- KARAOKE PLAYER BLOCK DIAGRAM - 3-10 -...
  • Page 29 • CD/ DVD BLOCK DIAGRAM - 3-11 -...
  • Page 30 • DVD- PLAYER RF/ CD DSP/ DVD DSP / DVD SERVO BLOCK DIAGRAM - 3-12 -...
  • Page 31 • DVD- PLAYER MPEG BLOCK DIAGRAM - 3-13 -...
  • Page 32 • DVD- PLAYER UCOM BLOCK DIAGRAM - 3-14 -...
  • Page 33 • MIDI BLOCK DAIGRAM - 3-15 -...
  • Page 34 REPAIRS REGARDING CD MECHANISM • IMPROVED METHOD - WHEN THE TRAY GEARS WERE DISTORTED BASE MAIN GEAR PU DOWN GEAR MAIN GEAR CAM TRAY LOADING PICK UP 1. How to open the tray ➀ ➁ Push two hooks (H) of the BASE MAIN, and open the TRAY LOADING 2.
  • Page 35 SECTION 5. SPEAKER SECTION MODEL: LMS-K2930V RUN DATE : 19.MAY.2003 LOCA.NO. PART NO DESCRIPTION SPECIFICATION REMARKS 3720RMF052A PANEL,FRONT SPK LMS-1030 MOLD PANEL STANDA 6400TETB03B SPEAKER,TWEETER 06T45EHC2410A EAW TWEETER(CONE 6400WETJ05B SPEAKER,WOOFER 16P90EHC2408B EAW WOOFER LMS-2 4980RM0001A SUPPORTER SPK LMS-1030 MOLD W/F SUPPORT 4766RM0035A FELT LMS-1030( BLACK ) DUCT...
  • Page 36 MEMO...

  • Page 37: Block Diagram

    BLOCK DIAGRAM NOTE: Warning NOTE: Parts that are shaded are critical With respect 1. Shaded(I) parts are critical for safety.Replace only to risk of fire or electrical shock. with specified part number. 2. Voltages are DC-measured with a digital voltmefer during Play mode.

  • Page 38: Schematic Diagrams

    SCHEMATIC DIAGRAMS • MAIN SCHEMATIC DIAGRAM 2-15 2-16...
  • Page 39 • FRONT SCHEMATIC DIAGRAM 2-17 2-18...
  • Page 40 • DECK SCHEMATIC DIAGRAM 2-19 2-20...
  • Page 41 • POWER/AV JACK/MIC SCHEMATIC DIAGRAM NOTE: Warning NOTE: Parts that are shaded are critical With respect 1. Shaded(I) parts are critical for safety.Replace only to risk of fire or electrical shock. with specified part number. 2. Voltages are DC-measured with a digital voltmefer during Play mode.
  • Page 42 • AMP SCHEMATIC DIAGRAM 2-23 2-24...
  • Page 43 WIRING DIAGRAM NOTE: Warning NOTE: Parts that are shaded are critical With respect 1. Shaded(I) parts are critical for safety.Replace only to risk of fire or electrical shock. with specified part number. 2. Voltages are DC-measured with a digital voltmefer during Play mode.
  • Page 44 PRINTED CIRCUIT DIAGRAMS • MAIN P.C. BOARD (SOLDER SIDE) 2-27 2-28...
  • Page 45 • MAIN P.C. BOARD (COMPONENT SIDE) 2-29 2-30...
  • Page 46 • FRONT P.C. BOARD (COMPONENT SIDE) 2-31 2-32...
  • Page 47 • FRONT P.C. BOARD(SOLDER SIDE) 2-33 2-34...
  • Page 48 • Power P.C. BOARD MEMO NOTE: Warning Parts that are shaded are critical With respect to risk of fire or electrical shock. • MIC P.C. BOARD 2-35 2-36...

  • Page 49: Schematic Diagrams

    SCHEMATIC DIAGRAMS • MICOM & EXPANDER SCHEMATIC DIAGRAM 3-17 3-18...
  • Page 50 • DRIVE & RF SCHEMATIC DIAGRAM 3-19 3-20...
  • Page 51 • DVD DSP SCHEMATIC DIAGRAM 3-21 3-22...
  • Page 52 • MPEG (W/S) SCHEMATIC DIAGRAM 3-23 3-24...
  • Page 53 • MIDI SCHEMATIC DIAGRAM 3-25 3-26...
  • Page 54 • I/O MAIN SCHEMATIC DIAGRAM 3-27 3-28...

  • Page 55: Ic Voltage Sheet

    IC VOLTAGE SHEET PIN NUM. STOP DVD PLAY MIDI PLAY PIN NUM. STOP DVD PLAY MIDI PLAY PIN NUM. STOP DVD PLAY MIDI PLAY PIN NUM. STOP DVD PLAY MIDI PLAY PIN NUM. STOP DVD PLAY MIDI PLAY PIN NUM. STOP DVD PLAY MIDI PLAY PIN NUM.
  • Page 56 PIN NUM. STOP DVD PLAY MIDI PLAY PIN NUM. STOP DVD PLAY MIDI PLAY PIN NUM. STOP DVD PLAY MIDI PLAY PIN NUM. STOP DVD PLAY MIDI PLAY PIN NUM. STOP DVD PLAY MIDI PLAY PIN NUM. STOP DVD PLAY MIDI PLAY PIN NUM.

  • Page 57: Printed Circuit Diagrams

    PRINTED CIRCUIT DIAGRAMS • DVD KARAOKE PCB BOARD (SOLDER SIDE) 3-33 3-34...
  • Page 58 • DVD KARAOKE PCB BOARD (COMPONENT SIDE) 3-35 3-36...

  • Page 59: Section 4. Exploded Views

    SECTION 4. EXPLODED VIEWS NOTE) Refer to “SECTION 6 REPLACEMENT PARTS LIST” in order to look for the • CABINET AND MAIN FRAME SECTION part number of each part. TUNER...
  • Page 60 • TAPE DECK MECHANISM (A/R & A/S : LEFT A/S DECK) LOCA. NO. PART NO. DESCRIPTION SPECIFICATION 6720AG0002B DECK,AUDIO CWM42FR31 TOKYO PIGEON L-DOUBL 6768R-PP03A DECK MECHANISM PARTS 33-160-4309 PIGEON PRESS CASSE 6768R-GP03B DECK MECHANISM PARTS 50-222-4578 PIGEON GEAR IDLER 6768R-SP01F DECK MECHANISM PARTS 01-082-4598 PIGEON SPRING CWL4 6768R-MP01C...

  • Page 61: Tape Deck Mechanism (A/R & A/S : Right A/R Deck)

    • TAPE DECK MECHANISM (A/R & A/S : RIGHT A/R DECK) LOCA. NO. PART NO. DESCRIPTION SPECIFICATION 6720AG0002B DECK,AUDIO CWM42FR31 TOKYO PIGEON L-DOUBL 6768R-UP03D DECK MECHANISM PARTS 50-093-4895 PIGEON PWB UNIT CW 6768R-BP03D DECK MECHANISM PARTS 02-083-4254 PIGEON BELT/FELT C 6768R-BP03E DECK MECHANISM PARTS 02-083-4256 PIGEON BELT/FELT C...

  • Page 62: Cd Mechanism

    • CD MECHANISM LOCA.NO PART NO DESCRIPTION SPECIFICATION 4405RCS004A MECHANISM ASSEMBLY DVM-H1503 HZ DVD 3 CHANGER 3041RBD001A BASE ASSEMBLY PU(DVM-H1503) -HZ 3390RB0002A TRAY DISC(CDM-H1503) 4470RB0005A GEAR TRAY (CDM-H1503) 4681RBA001A MOTOR ASSEMBLY TRAY (CDM-H1503) 6871RF9211A PWB(PCB) ASSEMBLY,FRONT 1503 T/D SENSOR 3390RB0001A TRAY LOADING(CDM-H1503) 4400SB0001A...

Table of Contents