Sharp VC-A582U User Manual

1
VC-A582U
VC-A582U(A)
VC-H982U
SERVICE MANUAL
VIDEO CASSETTE RECORDER
In the interests of user-safety (Required by safety regula-
tions in some countries) the set should be restored to its
original condition and only parts identical to those specified
be used.
MODELS VC-A582U/A582U(A)/H982U
SY7J5VCA582U/
MODELS
SERVICE MANUAL
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
SHARP CORPORATION
CONTENTS
Page
1. GENERAL INFORMATION .............................. 4
1-1 FEATURES .................................................4
1-2 SPECIFICATIONS ..................................... 4
1-3 LOCATION OF MAJOR COMPONENTS
AND CONTROL ......................................... 5
2. DISASSEMBLY AND REASSEMBLY .............. 6
2-1 DISASSEMBLY OF MAJOR BLOCKS ....... 6
2-2 DISASSEMBLING THE MECHANISM/
MAIN PWB ASSEMBLY............................. 7
2-3 CARES WHEN REASSEMBLING.............. 8
3. FUNCTION OF MAJOR MECHANICAL
PARTS ..............................................................9
4. ADJUSTMENT, REPLACEMENT AND
ASSEMBLY OF MECHANICAL UNITS .......... 11
4-1 MECHANISM CONFIRMATION
ADJUSTMENT JIG .................................. 11
5. ELECTRICAL ADJUSTMENT ........................ 30
5-1 ADJUSTMENT OF HEAD SWITCHING
POINT .......................................................31
Page
5-2 ADJUSTMENT OF FV (False Vertical Sync)
OF STILL PICTURE ................................. 31
5-3 CHECKING OF OFF TRACK ................ 31
5-4 ADJUSTMENT OF SIF-INPUT LEVEL .... 32
5-5 ADJUSTMENT OF FILTER...................... 32
5-6 ADJUSTMENT OF STEREO VCO........... 32
5-7 ADJUSTMENT OF STEREO
SEPARATION ...........................................32
6. MECHANISM OPERATION FLOWCHART
AND TROUBLESHOOTING GUIDE .............. 33
7. TROUBLESHOOTING ................................... 39
8. BLOCK DIAGRAM ..........................................51
9. SCHEMATIC DIAGRAM AND PWB FOIL
PATTERN .......................................................61
10.REPLACEMENT PARTS LIST ....................... 77
11.EXPLODED VIEW OF MECHANICAL
PARTS ............................................................90
12.PACKING OF THE SET ................................. 95
VIDEO CASSETTE RECORDER
VC-A582U
VC-A582U(A)
VC-H982U
VC-A582U/A582U(A)
VC-H982U

Sharp VC-A582U Specifications

General

Brand	Sharp
Model	VC-A582U
Category	VCR
Language	English

Summary

Important Service Notes

Disassembly and Reassembly

2-1 Disassembly of Major Blocks

Step-by-step guide to disassembling the main external parts of the VCR.

2-2 Disassembling the Mechanism/Main PWB Assembly

Procedure for separating the mechanism and main printed wiring board.

Adjustment, Replacement and Assembly of Mechanical Units

4-1 Mechanism Confirmation Adjustment Jig

Lists special jigs required for mechanism adjustment and maintenance.

Torque Adjustments

Methods to check and adjust take-up torque in FF, rewind, and video search rewind modes.

Back Tension and Pressure Adjustments

How to check and adjust back tension, pinch roller pressure, and tension pole position.

Brake Torque Checking

Methods for checking brake torque on the supply and take-up reel sides.

Head and Guide Replacement/Adjustment

Guide for replacing the A/C head and adjusting its height and the reverse guide.

Motor Replacement

Steps for removing and replacing the capstan and drum motors.

Drum Assembly and Phase Matching

Guide for replacing the drum assembly and assembling phase matching parts.

Electrical Adjustment

5-1 Adjustment of Head Switching Point

Adjusting the head switching point for optimal signal.

5-2 Adjustment of FV (False Vertical Sync) of Still Picture

5-3 Checking of Off Track

5-4 Adjustment of SIF-Input Level

5-5 Adjustment of Filter

5-6 Adjustment of Stereo VCO

5-7 Adjustment of Stereo Separation

Troubleshooting

Power Troubleshooting

Flowcharts for diagnosing various power supply issues.

Mechanism Failure Troubleshooting

Flowcharts for diagnosing FF/REW, REC/PLAY, winding, and unusual sound failures.

Signal and Audio Troubleshooting

Flowcharts for diagnosing picture and Hi-Fi sound signal issues.

Schematic Diagram and PWB Foil Pattern

Important Safety Notice

Schematic Diagram

Detailed circuit diagrams of the VCR.

PWB Foil Pattern

Exploded View of Mechanical Parts

Mechanism Chassis Parts

Cassette Housing Control Parts

Front Panel Parts