LG EC990SW Manuals

Manuals and User Guides for LG EC990SW. We have 1 LG EC990SW manual available for free PDF download: Service Manual

LG EC990SW Service Manual

LG EC990SW Service Manual (78 pages)

VIDEO CASSETTE RECORDER

Brand: LG | Category: VCR | Size: 8.03 MB

Table of Contents

Table of Contents

2
- Video Cassette
  1
- Key to Abbreviations
  
  3
- Important Safety Precautions
  
  4
  - Precautions During Servicing
    4
- Safety Check after Servicing
  
  5
- Proposal for Applying Short
  
  6
- Protection
  
  6
- Service Notice on Replacing Eeprom
  
  7
- IC Setting
  
  8
- Service Information for Eeprom
  
  8
- Specifications
  
  8
  - Cabinet & Main Chassis
    
    9
    
    Electrical Part
    9
    
    Service Method
    9
    
    Cabinet & Main Frame Section
    10
    
    Exploded Views
    10
    
    Packing Accessory Section
    11
  - Section 2
    
    9
  - Electrical
    
    12
    
    Electrical Adjustment Points Arrangement
    12
    
    Electrical Adjustment Procedures
    13
    
    Electrical Troubleshooting Guide
    15
    
    Power Circuit(SMPS)
    15
    
    Servo Circuit
    18
    
    System & Front Panel Circuit
    21
    
    Y/C Circuit
    24
    
    Tuner/If Circuit
    28
    
    Hi-Fi Circuit
    31
  - Section 3
    
    12
  - Section 1
    
    35
  - Summary
    
    35
    
    Block Diagrams
    33
    
    Power Block Diagram
    33
    
    Hi-Fi Block Diagram
    35
    
    Y/C Block Diagram
    35
    
    System Block Diagram
    36
    
    Circuit Diagrams
    37
    
    Power Circuit Diagram
    37
    
    Tuner, NICAM, A2 Circuit Diagram
    38
    
    A/V Circuit Diagram
    39
    
    System Circuit Diagram
    40
    
    Hi-Fi Circuit Diagram
    41
    
    Waveform
    42
    
    Circuit Voltage Chart
    43
    
    MAIN P.C.board
    45
    
    Printed Circuit Board Diagrams
    45
    
    KEY (LEFT) P.C.board
    46
Section 4 Mechanism

47
- Deck Mechanism Parts Locations
  48
  - Bottom View
    
    48
  - Top View
    
    48
  - Deck Mechanism Disassembly
    
    49
    
    Drum Assembly
    49
    
    Arm Assembly F/L
    51
    
    Bracket Assembly L/D Motor
    51
    
    Gear Assembly Rack F/L
    51
    
    Holder Assembly CST
    51
    
    Lever Assembly S/W
    51
    
    Opener Door
    51
    
    Plate Top
    51
    
    Arm Assembly Cleaner
    52
    
    Base Assembly A/C Head
    52
    
    Head F/E
    52
    
    Arm Assembly Tension
    53
    
    Brake Assembly RS
    53
    
    Brake Assembly T
    53
    
    Reel S / Reel T
    53
    
    Arm Assembly Pinch
    54
    
    Base Assembly P4
    54
    
    Lever T/Up / Arm T/Up
    54
    
    Opener Lid
    54
    
    Belt Capstan/Motor Capstan
    55
    
    Brake Assembly Capstan
    55
    
    Clutch Assembly D35
    55
    
    Lever F/R
    55
    
    Gear Drive/Gear Cam
    56
    
    Gear Sector
    56
    
    Lever Spring
    56
    
    Lever Tension
    56
    
    Plate Slider
    56
    
    Base Assembly P2
    57
    
    Base Assembly P3
    57
    
    Gear Assembly P2
    57
    
    Gear Assembly P3
    57
    
    Arm Assembly Idler Jog
    58
    
    Base Loading
    58
    
    Base Tension
    58
  - Tools and Fixtures for Service
    
    59
    
    Mechanism Alignment Position Check
    60
    
    Checking Torque
    61
    
    Preparation for Adjustment
    61
    
    Guide Roller Height Adjustment
    62
    
    Precise Adjustment
    62
    
    Preliminary Adjustment
    62
    
    Audio/Control (A/C) Head Adjustment
    63
    
    Preliminary Adjustment
    63
    
    Precise Adjustment(Azimuth Adjustment)
    64
    
    X-Value Adjustment
    64
    
    Adjustment after Replacing Drum Assembly (Video Heads)
    65
    
    Check the Tape Travel after Reassembling Deck Assembly
    65
    
    Checking Audio and RF Locking Time During Playback after CUE or REV
    65
    
    Checking Tape Curling or Jamming
    65
    
    Deck Mechanism
    65
  - Deck Mechanism Adjustment
    
    59
  - Maintenance/Inspection Procedure
    
    66
    
    Check before Starting Repairs
    66
    
    Cleaning
    67
    
    Maintenance Procedure
    67
    
    Required Maintenance
    67
    
    Scheduled Maintenance
    67
    
    Supplies Required for Inspection and Maintenance
    67
    
    Greasing
    68
  - Mechanism Troubleshooting Guide
    
    70
    
    Deck Mechanism
    70
    
    Front Loading Mechanism
    73
  - Exploded Views
    
    75
    
    Front Loading Mechanism Section
    75
    
    Moving Mechanism Section (1)
    76
    
    Moving Mechanism Section (2)
    77

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