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ITT 4985
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of ITT 4985 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Table of Contents
    • Technical Specifications, Precautions
    • Disassembly
    • Layout of Main Mechanical Parts
    • Periodic Maintenance
    • Key to Abbreviation
    • Mechanism Control Block Diagram
    • Audio Block Diagram Type B, C, D
    • Drum Servo Block Diagram
    • Capstan Servo Block Diagram
    • Audio Block Diagram Type A
    • Audio Demodulator Block Diagram Type A
    • Luminance Signal Block Diagram
    • Color Signal Block Diagram
    • Tuner/IF Block Diagram Type A, B
    • Timer/Presetter Block Diagram Type A, B
    • Tuner/IF Block Diagram Type C, D
    • Timer/Presetter Block Diagram Type C, D
    • Overall Wiring Diagram Type A
    • Overall Wiring Diagram Type B
    • Overall Wiring Diagram Type C
    • Mechacon, Servo, Audio and Operation Circuits Type A
    • A/S/M Circuit Board Type A
    • Operation Circuit Board Type A
    • Mechacon Sub Board
    • Mechacon, Servo, Audio and Operation Circuits Type B, C, D
    • A/S/M Circuit Board Type B, C, D
    • Operation Circuit Board Type B, C, D
    • Mechacon Sub Board
    • Video Circuits
    • Video Circuit Board Type A
    • Video Circuit Board Type B, C, D
    • Terminals
    • Audio and Demodulator Circuits Type A
    • Audio Circuit Board
    • Demodulator Circuit Board
    • Tuner/IF Circuit Type A
    • Regulator Circuit
    • Timer/Presetter Circuit Type A, B
    • Tuner/IF Circuit Board Type A
    • Timer Sub Board Type A, B
    • Timer/Presetter Circuit Board Type A, B
    • Regulator Circuit Board
    • Tuner/IF and Timer/Presetter Circuits Type C, D
    • Tuner/IF Circuit Board Type C, D
    • Timer/Presetter Circuit Board Type C, D
    • Tuner/IF Circuit Type B
    • Tuner/IF Circuit Board Type B
    • Mix Booster
    • Remote Control Circuit
    • RF - Converter Circuits
  • 2. General Mechanical Adjustment
  • 2.1 Important Precautions
  • 2.1.2 Required Jigs and Tools
  • 2.2 Layout of Main Mechanical Parts
  • 2.2.1 Exploded View
  • 2.3 Main Assembly Replacements
  • 2.4 Tape Transport System Checks and Adjustment
  • 2.5 Interchangeability Adjustment
  • 3. Electrical Adjustments
  • 3.1 Preparation
  • 3.2 Regulator Circuit
  • 3.3 Servo Circuit
  • 3.4 Mechacon Circuit
  • 3.5 Video Circuit
  • 3.6 Audio Circuit Stereo
  • 3.6 Audio Circuit Mono
  • 3.7 Tuner/IF Circuit
  • 3.8 Demodulator Circuit (Stereo)
  • 4. Audio Multiplex TV Signal Generator
  • 5. Position of Testpoints and Adjusters
    1. General Description
      1. Mechacon Functions in Various Modes
        1. OPERATE Switch ON
        2. Cassette Housing up and down States
        3. Operating Modes
        4. Timer Switch ON
        5. Mode Shift Table
      2. Timer Functions and Operation
        1. Clock
        2. Programm Functions
        3. Timer Recording Operation
        4. Program Entry Complete
        5. Setting Corrections and Checks
        6. Mode Return
        7. Instant Recording
        8. Counter
        9. Counter Reset
        10. Zero Output
        11. Lap Time
        12. Lap Time Release
        13. Lap Time Reset
        14. Tape Running Indicator
        15. Station Selection Typ C, D
        16. Station Selection Typ A, B
    2. Mechanism Description
      1. Functions of Major Parts
        1. Drum Motor
        2. Solenoid
        3. Capstan Motor
        4. Mode Control Motor
      2. Description of Operations
        1. Stop Mode
        2. Loading Mode
        3. Play Mode
        4. Still Mode
        5. Search Mode
        6. Pause Mods
        7. Unloading Mode
        8. Fast Forward/Rewind Modes
      3. Cassette Housing Operation
        1. Cassette Loading Mechanism
        2. Cassette Loading and Eject End Detect
        3. Upper and Lower Door Mechanisms
    3. Circuit Description
      1. Mechanism Control System
        1. General
        2. Infrared Remote Control Unit
        3. Mechanism Features
        4. Circuit Description
      2. Servo System
        1. General
        2. Principle of the Servo System
        3. Servo Circuit Description
      3. Video System
        1. General
        2. Luminance Signal System
        3. Color Signal System
      4. Audio System
        1. General Typ B, C, D
        2. Block Diagram Description
        3. Muting Control
        4. General Stereo Version Typ A
        5. Block Diagram Description
        6. Demodulator Circuit Stereo Version Typ A
      5. Timer Presetting Circuit
        1. Recorder Typ C, D
          1. Clock
          2. Program Functions
          3. Timer Recording Operation
          4. Program Entry Complete
          5. Setting Corrections and Checks
          6. Mode Return
          7. Instant Recording
          8. Counter
          9. Counter Reset
          10. Zero Output
          11. Lap Time
          12. Lap Time Release
          13. Lap Time Reset
          14. Tape Running Indicator
          15. Station Selection
        2. Typ A, B
          1. Auto Tuning Operation
          2. Pulse - Width Modulation (PWM)
          3. Functions of Major ICs
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