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Sony DNW-A75 User Manual

Sony DNW-A75
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DIGITAL VIDEOCASSETTE RECORDER
DNW-A75/A75P
MAINTENANCE MANUAL Part 1
1st Edition (Revised 8)
Serial No. 10001 and Higher: DNW-A75
Serial No. 40001 and Higher: DNW-A75P

Table of Contents

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Sony DNW-A75 Specifications

General IconGeneral
TypeProfessional VCR
Audio Channels4 channels
DisplayLCD
Power RequirementsAC 100-240V, 50/60Hz
Input/Output ConnectorsComposite, SDI
Video FormatDigital Betacam, Betacam SX, Betacam

Summary

Section 1 Installation

1-1. Installation Procedure

Flowchart of the installation procedure and related sections.

1-2. Supplied Accessories

List of accessories supplied with the unit for installation.

1-3. Operating Conditions

Specifies the environmental and operational conditions for safe and optimal unit use.

1-4. Power Supply

Details voltage and power requirements, including rush current considerations.

1-5. Installation Space

Specifies required dimensions and ventilation space for rack or desk mounting.

1-6. Rack Mounting

Step-by-step guide for mounting the unit into a 19-inch standard rack.

1-7. Matching Connectors and Cables

Lists required connectors and cables for external connections, with part numbers.

1-8. Signal Inputs and Outputs

Diagram and list of all signal input and output connectors on the rear panel.

1-9. Switch Settings on Connector Panel

Configuration settings for analog audio input level and video input termination switches.

1-10. Switch and Shorting Plug Settings on PC Boards

Details settings for various PC boards, including APR-40, AU-260, DM-89, TBC-23A, SS-83.

1-11. Switching Search Dial Mode

Explains how to switch between Jog and Shuttle modes using the search dial.

1-12. Reference System

Explains how external reference video signals are selected and used.

1-13. Settings and Adjustment when External Equipment is Connected

Covers time code settings, VTR constant values, and system phase alignment.

Section 2 Service Overview

2-1. Notes on Power Supply Block

Safety warnings regarding electric shock and circuit breaker reset.

2-2. Cleaning when the Heads are Clogged

Procedure for cleaning clogged video heads using specific tapes or cloths.

2-3. Removing/Reattaching Cabinet

Instructions for removing and reattaching the unit's upper lid, side panels, and bottom plate.

2-4. Removing/Reattaching Plate MD Assembly

Steps for removing and reinstalling the Plate MD assembly.

2-5. Removing/Reattaching Cassette Compartment

Procedures for removing and reinstalling the cassette compartment.

2-6. Removing/Reattaching Lower Control Panel Assembly

Steps for removing and reinstalling the lower control panel assembly.

2-7. Circuit Function

Lists various boards and their corresponding circuit functions within the unit.

2-8. Location of Main Parts

Identifies the physical locations of printed circuit boards and mechanical parts.

2-9. Function and Location of Sensors

Details the function and placement of various sensors used in the unit.

2-10. System of Cassettes

Explains the types of cassettes and their associated plugs and tabs.

2-11. Function of LEDs on Circuit Boards

Describes the function of LEDs on the SS-83 board and other circuit boards.

2-12. Taking Out the Cassette in Tape Slacking

Procedure for safely removing a cassette when tape slack occurs.

2-13. Removing/Reattaching Plug-in Boards

Instructions for removing and reinstalling various plug-in boards.

2-14. Fixtures and Adjustment Equipment List

Lists necessary fixtures and equipment for maintenance and adjustment procedures.

2-15. ISR

Overview of the Interactive Status Reporting function and its capabilities.

2-16. Battery for Memory Backup

Information on replacing the memory backup battery and its implications.

2-17. Setup Menu (F-Series)

Explains F-series setup menu items for adjustment and maintenance.

Section 3 Error Message

3-1. Overview of Error Message

Describes the self-diagnostics function and error display mechanisms.

3-2. Details of Error Messages

Provides a detailed list of error codes, their descriptions, and causes.

Section 4 Maintenance Mode

4-1. Overview of Maintenance Mode

Explains the purpose and structure of the maintenance mode, including buttons and switches.

4-2. TAPE Maintenance Mode (M0)

Details the TAPE maintenance mode used for VTR part maintenance and checks.

4-4. OTHERS CHECK Mode (M3)

Covers various checks and utilities, including ROM version, serial number, and memory card functions.

4-5. Setup Maintenance Mode (M4)

Details the setup maintenance mode, including extended menus and reset functions.

Section 5 Periodic Maintenance and Inspection

5-1. Periodic Maintenance

Recommends periodic checks and parts replacement to ensure performance and longevity.

5-2. Cleaning

Provides detailed instructions for cleaning various components, including heads and tape paths.

5-3. Video Head Tip Protrusion Check

Describes the procedure for measuring video head tip protrusion for drum assembly replacement.

Section 6 Spare Parts

6-1. Notes on Repair Parts

Important notes regarding safety, standardization, and stock of replacement parts.

6-2. Exploded Views

Illustrated exploded views of unit assemblies with part numbers.

6-3. Plug-in Boards

Lists the part numbers and descriptions for all plug-in boards used in the unit.

6-4. Packing Materials and Supplied Accessories List

Lists the packing materials and accessories supplied with the unit.

6-5. Power Cords List

Lists the power cords required for different regions.

6-6. Fixtures List

Lists the specialized tools and fixtures required for maintenance and adjustment.

Appendix A Outline of Format

A-1. Outline

Provides an overview of the Sony DNW series using the Betacam SX format.

A-2. Recording Format

Details the footprint, helical track, and data arrangement for Betacam SX and SP formats.

A-3. Head Configuration

Explains the arrangement and placement of stationary and rotary heads.

A-4. Signal Processing

Outlines the video and audio signal compression and processing systems.

Appendix B Setting Check Sheet

Appendix C Circuit Description and Overall Block Diagram

(1) Video Signal Processing System (CP-334, DEC-110, SDI-41, and VPR-47 Boards)

Explains the video signal processing for recording and playback systems.

(2) Audio Signal Processing System (CP-278, CP-301, CP-335, APR-40, AU-260, DPR-118, VR-223, and VR-224 Boards)

Details the audio signal processing for recording and playback, including various interfaces.

(3) Digital Signal Processing System (DPR-118 board, DPR-119 board/BKNW-118, and DPR-150 board/BKNW-124)

Describes the digital signal processing for SX encoding, ECC, and output systems.

(4) RF System (EQ-75 Board and Drum Assembly)

Explains the RF system's recording, playback, and control signal processing.

(5) Analog Betacam PB Video System (DM-89, TBC-23A, and TBC-24 Boards)

Covers the analog Betacam PB video system, including FM demodulation and timing adjustment.

(6) System Control System and Servo System (SS-83 Board)

Details the system control and servo control functions performed by the SS-83 board CPUs and MPUs.

(7) SDTI (SX) Output System (Option) (DPR-119 Board/BKNW-118)

Explains the SDTI (SX) output processing for the DPR-119 board.

(8) SDTI-CP Output System (Option) (DPR-150 Board/BKNW-124)

Explains the SDTI-CP output processing for the DPR-150 board.

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