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Sharp VC-MH705HM/LM

Sharp VC-MH705HM/LM
73 pages
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VC-MH705HM/LM
VC-MH815HM/LM,MH85HM
VC-MH715HM,MH835HM
VC-MH715HM
VC-MH705HM/LM
VC-MH815HM/LM,MH85HM
2st Edition
VIDEO CASSETTE RECORDER
SERVICE MANUAL
SHARP CORPORATION
In the interests of user-safety (Required by safety regulations in some
countries) the set should be restored to its original condition and only parts
identical to those specified be used.
VC-MH705HM/LM
VC-MH715HM
VC-MH815HM/LM
VC-MH85HM
VC-MH835HM
MODELS
CONTENTS
Page
1. SPECIFICATIONS................................................................................................................. 3
2. DISASSEMBLY AND REASSEMBLY ................................................................................... 4
3. FUNCTION OF MAJOR MECHANICAL PARTS ................................................................... 7
4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS .................. 9
5. ELECTRICAL ADJUSTMENT ............................................................................................. 28
6. MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE .............. 35
7. TROUBLESHOOTING ........................................................................................................ 41
8. BLOCK DIAGRAM............................................................................................................... 56
9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN ......................................................... 64
10. REPLACEMENT PARTS LIST ............................................................................................ 84
11. EXPLODED VIEW OF MECHANISM PARTS ..................................................................... 93
12. PACKING OF THE SET .................................................................................................... 100
VC-MH835HM
www.freeservicemanuals.info
6/17/2019
Digitized in Heiloo the Netherlands
Not for sale!
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Sharp VC-MH705HM/LM Specifications

General IconGeneral
Number of heads4
Hi-Fi StereoYes
Remote ControlYes
Recording FormatsVHS
TunerYes
Playback FormatsVHS

Summary

PRECAUTIONS IN PART REPLACEMENT

Component Handling Precautions

Specific guidelines for handling sensors, photocouplers, and cam switches.

1. SPECIFICATIONS

Detailed Technical Specifications

Comprehensive details on video, audio, and mechanical aspects of the VCR.

2. DISASSEMBLY AND REASSEMBLY

Disassembly of Major Blocks

Step-by-step guide to disassembling the main components of the unit.

Cares During Reassembly

Specific instructions and precautions for reassembling the unit's parts.

3. FUNCTION OF MAJOR MECHANICAL PARTS

Mechanical Parts Identification (Top & Bottom Views)

Diagrams and lists identifying key mechanical parts from top and bottom views.

5. ELECTRICAL ADJUSTMENT

Adjustment Procedures Overview

Guide to electrical adjustments, instruments, and test points.

Servo, YC, Audio, TunerIF, Timer & Power Adjustments

Procedures for adjusting various circuits including servo, Y/C, audio, tuner, timer, and power.

6. MECHANISM OPERATION AND TROUBLESHOOTING

Mechanism Operation Flowchart

Flowchart detailing the VCR mechanism's operational sequence.

Mechanism Troubleshooting Guide

Guide for diagnosing and resolving mechanism-related faults.

7. ELECTRICAL TROUBLESHOOTING

Power Supply & System Control Troubleshooting

Flowcharts for power, system control, key input, and cassette/loading issues.

Mechanism & Signal Path Troubleshooting

Flowcharts for motor controls, audio/video signals, and recording problems.

Servo & Specialized Circuit Troubleshooting

Flowcharts for servo systems, NICAM/IGR, decoder, and other specialized circuits.

REPLACEMENT OF IC710 (EPROM)

IC710 Replacement and Reprogramming

Procedures for replacing IC710 and reprogramming its memory function.

Jumper Setting and REC Current Setting

Procedures for setting jumpers and REC current via the TV screen.

ROM MAP

Model and Jumper Setting Data

Table detailing ROM data for various models and jumper settings.

8. BLOCK DIAGRAMS

System, Signal Flow, Audio, and Power Diagrams

Diagrams illustrating system overview, signal paths, audio, and power circuits.

9. SCHEMATIC DIAGRAMS AND PWB FOIL PATTERNS

Main Circuit Schematics and PWB Layouts

Schematic and PWB layout for the main circuit section (1-1).

Specialized Circuit PWB Layouts

PWB layout for the EUR-TERM circuit.

10. REPLACEMENT PARTS LIST

Part Identification and Listings

Guide to identifying transistors/diodes and categorized part listings.

How to Order Parts

Instructions on how to correctly order replacement parts.

11. EXPLODED VIEWS

Mechanism Chassis Parts Exploded View

Illustrated diagram of mechanism chassis components assembly.

Mechanical and Front Panel Parts Exploded Views

Exploded views of mechanical and front panel parts by model.

12. PACKING OF THE SET

Packing Guidelines and Accessories

Illustration and list of accessories for packing the VCR unit.

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