Sharp VC-H993U User Manual

1
VC-A592U/A593U
VC-A5933U/H992U
VC-H993U/H994U
S39D7VC-A592U
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
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.
VIDEO CASSETTE RECORDER
SERVICE MANUAL
MODELS VC-A592U/A593U/A5933U/H992U/H993U/H994U
VIDEO CASSETTE RECORDER
VC-A592U/A593U
VC-A5933U/H992U
VC-H993U/H994U
Page
1. GENERAL INFORMATION .............................. 5
1-1 FEATURES .................................................5
1-2 SPECIFICATIONS ..................................... 5
1-3 LOCATION OF MAJOR COMPONENTS
AND CONTROL ......................................... 6
2. DISASSEMBLY AND REASSEMBLY .............. 7
2-1 DISASSEMBLY OF MAJOR BLOCKS ....... 7
2-2 DISASSEMBLING THE MECHANISM/
MAIN PWB ASSEMBLY............................. 8
2-3 CARES WHEN REASSEMBLING.............. 9
3. FUNCTION OF MAJOR MECHANICAL
PARTS ............................................................10
4. ADJUSTMENT, REPLACEMENT AND
ASSEMBLY OF MECHANICAL UNITS .......... 12
4-1 MECHANISM CONFIRMATION
ADJUSTMENT JIG .................................. 12
5. ELECTRICAL ADJUSTMENT ........................ 31
5-1 ADJUSTMENT OF HEAD SWITCHING
POINT .......................................................32
Page
5-2 ADJUSTMENT OF FV (False Vertical Sync)
OF STILL PICTURE ................................. 32
5-3 CHECKING OF OFF TRACK ................... 32
5-4 ADJUSTMENT OF SIF-INPUT LEVEL .... 33
5-5 ADJUSTMENT OF STEREO
SEPARATION ...........................................33
6. MECHANISM OPERATION FLOWCHART
AND TROUBLESHOOTING GUIDE .............. 34
7. TROUBLESHOOTING ................................... 40
8. BLOCK DIAGRAM ..........................................52
9. SCHEMATIC DIAGRAM AND PWB FOIL
PATTERN .......................................................60
10.PARTS LIST....................................................79
11.EXPLODED VIEW OF MECHANICAL
PARTS ............................................................88
12.PACKING OF THE SET ................................. 94
CONTENTS
VC-A592U/H992U
VC-A593U/H993U
VC-A5933U
VC-H994U
VC-A593U/A5933U/H992U .............. Models for Canada
VC-A592U/A593U/H993U/H994U .... Models for U.S.A.
VC-A592U
VC-A593U
VC-A5933U
VC-H992U
VC-H993U
VC-H994U
MODELS

Sharp VC-H993U Specifications

General

Brand	Sharp
Model	VC-H993U
Category	VCR
Language	English

Summary

4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS

4-1 MECHANISM CONFIRMATION ADJUSTMENT JIG

Lists special jigs required for accurate mechanism adjustment and maintenance.

REEL DISK REPLACEMENT AND HEIGHT CHECK

CHECKING AND ADJUSTMENT OF TAKE-UP TORQUE IN FAST FORWARD MODE

Explains how to check and adjust the take-up torque for the VCR in FF mode.

REPLACEMENT OF THE CAPSTAN D.D. (DIRECT DRIVE) MOTOR

5. ELECTRICAL ADJUSTMENT

5-1 ADJUSTMENT OF HEAD SWITCHING POINT

Describes the procedure for setting the correct head switching point using an oscilloscope.

5-2 ADJUSTMENT OF FV (False Vertical Sync) OF STILL PICTURE

5-4 ADJUSTMENT OF SIF-INPUT LEVEL

6. MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE

MECHANISM TROUBLESHOOTING

Provides troubleshooting flowcharts for common mechanism failures like FF/REW, REC/PLAY, winding, and unusual sounds.

7. TROUBLESHOOTING

Troubleshooting Flowcharts

A collection of flowcharts guiding diagnosis of VCR malfunctions from power issues to circuit failures.

8. BLOCK DIAGRAM

SYSTEM SERVO BLOCK DIAGRAM

POWER CIRCUIT BLOCK DIAGRAM

9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN

MAIN CIRCUIT(1)(VC-A592U/A593U/H994U)

Displays the schematic and PWB foil pattern for the main circuit board, part 1.

OPERATION CIRCUIT