Sharp VC-A50S User Manual

1
VC-A10/A10S/A500
VC-A50/A50S/A50SB
VC-A60/A75/A80S
VIDEO CASSETTE PLAYER
VC-A10/A10S/A50/A50S/
A50S(B)/A60/A75/A80S
VC-A500
SERVICE MANUAL
CONTENTS
Page
1. SPECIFICATIONS................................................................................................................. 2
2. DISASSEMBLY AND REASSEMBLY ................................................................................... 3
3. FUNCTION OF MAJOR MECHANICAL PARTS ................................................................... 6
4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS .................. 9
5. ELECTRICAL ADJUSTMENT ............................................................................................. 28
6. MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE............... 31
7. TROUBLESHOOTING ........................................................................................................ 37
8. BLOCK DIAGRAM............................................................................................................... 45
9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN ......................................................... 55
10. REPLACEMENT PARTS LIST ............................................................................................ 68
11. EXPLODED VIEW OF MECHANICAL PARTS ................................................................... 77
12. PACKING OF THE SET ...................................................................................................... 82
SHARP CORPORATION
MODELS
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-A10/A10S
VC-A50/A50S/A50S(B)
VC-A500
VC-A60
VC-A75
VC-A80S
S62L3VC-A10//

Sharp VC-A50S Specifications

General

Video Format	NTSC
Tuner	Yes
Remote Control	Yes
Number of Heads	2
Playback Speed	SP/LP/EP
Timer Recording	Yes
Type	VHS
Recording System	Rotary 2-head helical scan
Inputs	Composite video, Audio
Outputs	Composite video, Audio
Dimensions	360 x 96 x 276 mm
Playback System	Rotary two-head helical scanning system

Summary

Precautions in Part Replacement

General Specifications

Disassembly and Reassembly

Mechanical Unit Adjustments

Torque Checking and Adjustment

Fast Forward Mode Torque

Procedure for checking and adjusting take-up torque in fast forward mode.

Torque Adjustments (Record/Playback & Video Search)

Record/Playback Mode Torque

Brake Torque Checking

A/C Head and Tape Drive Adjustments

Motor Replacements (Capstan & Drum)

Electrical Adjustment

Servo and Y/C Circuit Adjustments

Head Switching Point Adjustment

Mechanism Operation Flowchart

Mechanism Troubleshooting

FF/REW Failure (No Tape Winding)

Troubleshooting steps for failures related to FF/REW functions without tape winding.

Mechanism Troubleshooting (Sound & VSR)

Winding Failure at VSR

Troubleshooting steps for winding failures that occur during VSR mode.

Troubleshooting Flowcharts (Power, System Control)

Power Troubleshooting Flowcharts

Diagnostic flowcharts for power supply issues and system control problems.

Troubleshooting Flowcharts (Control & Remote)

Infrared R/C Troubleshooting

Flowcharts for diagnosing issues with the infrared remote control functionality.

Troubleshooting Flowcharts (Cassette & Motors)

Loading Motor and Eject Troubleshooting

Diagnostic flowcharts for problems related to loading motor and cassette ejection.

Troubleshooting Flowcharts (Drum Motor & Head Switching)

Drum Motor Troubleshooting

Diagnostic flowcharts for issues with the drum motor operation.

Troubleshooting Flowcharts (Servo Systems)

Drum Servo Troubleshooting

Flowcharts for diagnosing problems with the drum servo system.

Troubleshooting Flowcharts (E-E Mode)

Troubleshooting Flowcharts (Recording Mode)

Troubleshooting Flowcharts (Linear Sound)

Schematic Diagram

Replacement Parts List

Parts Replacement Details

Mechanical Parts Breakdown

Mechanism Chassis Parts