JVC TD-W777A - User Manual

TD-W7 7 7 A/B/C/E/G/J/U
JVC
SERVICE MANUAL
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April. 1988

JVC TD-W777A Specifications

General

Type	Double Cassette Deck
Track System	4-track, 2-channel stereo
Tape Speed	4.8 cm/s
Signal to Noise Ratio (Dolby B)	68dB
Total Harmonic Distortion	0.8%
Weight	6.5 kg
Heads	2 x Erase
Wow and Flutter	0.08% (WRMS)
Output	Line
Inputs	Line in
Outputs	Line out
Power Supply	120V AC, 60Hz
Dimensions	435 x 139 x 286 mm
Motor	Electronically controlled DC motor

Summary

Safety Precautions

General Safety Warnings

Important safety guidelines for handling and servicing the JVC TD-W777 unit.

Features

Specifications

Controls and Functions Overview

Front Panel Controls

Identifies and describes the function of each control on the front panel of the cassette deck.

Main Parts Location

Front and Rear Section Component Placement

Illustrates the physical location of major internal components in the front and rear sections.

Removal of Main Parts

Enclosure Component Removal

Instructions for removing the outer casing and chassis parts of the unit.

Internal Board and Mechanism Removal

Steps for removing power board, main PC board, and cassette mechanisms.

Main Adjustments

Equipment and Measuring Instruments

Lists necessary tools and test tapes for performing adjustments on the JVC TD-W777.

Mechanism Adjustment Procedures

Step-by-step guide for adjusting motor speed, wow/flutter, and torque for the cassette mechanisms.

Head Azimuth and Electrical Adjustments

Procedures for head alignment and locating electrical adjustment points on the PC boards.

Electrical Circuit Adjustment Procedures

Detailed steps for checking Dolby circuits, playback gain, frequency response, and bias.

Wiring Connections

Standard Schematic Diagrams (1)

Standard Schematic Diagrams (2)

Location of P.C. Board Parts

Exploded View of Mechanism Assembly

Exploded View of Enclosure Assembly

Block Diagram

Accessories