Sharp 13VT-K100 User Manual

13VT-K100/150
13VT-CK10
1
SERVICE MANUAL
CONTENTS
Page
» IMPORTANT SERVICE SAFETY PRECAUTION .................................................................................... 2
» ELECTRICAL SPECIFICATIONS ............................................................................................................ 6
» LOCATION OF USER’S CONTROL ........................................................................................................ 7
» DISASSEMBLY AND REASSEMBLY ......................................................................................................9
» INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................. 12
» PRECAUTIONS IN REASSEMBLING ................................................................................................... 17
» FUNCTION OF MAJOR MECHANICAL PARTS.................................................................................... 18
» ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS ...................................20
» ADJUSTMENT OF THE VCR ELECTRICAL CIRCUITRY .....................................................................40
» TROUBLESHOOTING ........................................................................................................................... 42
» CHASSIS LAYOUT ................................................................................................................................ 55
» BLOCK DIAGRAM OF TV SECTION.....................................................................................................57
» BLOCK DIAGRAM OF VCR SECTION ................................................................................................. 59
» OVERALL SCHEMATIC DIAGRAM.......................................................................................................69
» DESCRIPTION OF SCHEMATIC DIAGRAM......................................................................................... 71
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................... 83
» REPLACEMENT PARTS LIST............................................................................................................... 89
» PACKING OF THE SET ....................................................................................................................... 108
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 should be used.
S48O413VT-K10
MODELS
13VT-K100/150
13VT-CK10
TV/VCR COMBINATION
Chassis No. B97B
SHARP CORPORATION
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.

Sharp 13VT-K100 Specifications

General

Screen Size	13 inches
Tuner	NTSC
VCR Type	VHS
Display Type	CRT
Audio Output	Mono
Inputs	Composite
Outputs	Composite

Summary

Service Safety Precautions

High Voltage and X-Radiation Limits

Precautions regarding high voltage and X-radiation exposure during servicing.

Pre-Repair Safety Checks

Checks to perform before returning the receiver to the user for safety.

General Repair Warnings

Essential warnings for technicians performing repairs on the unit.

High Voltage System Repair Precautions

Specific precautions for repairing the high voltage system and picture tube.

Electrical Shock and Fire Prevention Checks

Checks to prevent electrical shock and fire hazards during service.

Electrical Specifications

Disassembly and Reassembly Procedures

Rear Cover and CRT PWB Removal

Steps for removing the rear cover and accessing the CRT PWB.

Main PWB and VCR Unit Removal

Procedure for removing the main PWB and VCR unit.

Installation and Service Instructions

X-Radiation Protector Circuit Test Procedure

Procedure for testing the X-radiation protector circuit's functionality.

High Voltage Check Procedure

Steps for verifying the receiver's high voltage output.

Service Mode Operation Guide

Entering and Exiting Service Mode

Instructions for accessing and exiting the unit's service mode.

Service Adjustment Parameter Selection

Methods for selecting adjustment items and data numbers in service mode.

VCR Service Adjustments

Reassembly Precautions

Cassette Controller Mounting Precautions

Precautions for mounting the cassette controller in the mechanism.

Mechanism to PWB Coupling Steps

Steps for coupling the VCR mechanism to the main PWB.

Mechanical Unit Adjustment Jigs

Maintenance Schedule and Checks

Cassette Housing Removal and Installation

Reel Disk Replacement and Height Check

Take-Up Torque Checks and Adjustments

Fast Forward Torque Check Procedure

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

Rewind Torque Check Procedure

Procedure for checking take-up torque in rewind mode.

Record/Playback Torque Check Procedure

Procedure for checking take-up torque in record/playback mode.

Video Search Rewind Torque Check Procedure

Procedure for checking take-up torque in video search rewind mode.

Specific VCR Checks and Adjustments

Video Search Rewind Back Tension Check

Procedure to check back tension in video search rewind mode.

Pinch Roller Pressure Check

Procedure to check the pressure of the pinch roller.

Tension Pole Position Check and Adjustment

Record/Playback Back Tension Check and Adjustment

Brake Torque Checks (Supply and Take-up Sides)

Procedure to check brake torque at both supply and take-up sides.

A/C Head Replacement and Adjustments

A/C Head Removal Steps

A/C Head Replacement Procedure

Rough A/C Head Height Adjustment

Reverse Guide Height Adjustment Steps

Tape Drive Train Adjustment Procedures

Tape Run Rough Adjustment Procedure

A/C Head Height and Azimuth Adjustment

Tape Run Adjustment Details

A/C Head X Value Adjustment Procedure

Drum and Capstan Motor Replacement

Capstan Motor Replacement Procedure

Drum Motor Replacement Procedure

Drum Assembly and Mechanism Component Assembly

Upper and Lower Drum Assembly Replacement

Phase Matching Mechanism Component Assembly

Pinch Drive Cam and Roller Assembly Method

Reverse Guide and Pinch Drive Cam Assembly

Pinch Roller and Open Lever Assembly

Shifter Installation Procedure

Master Cam Installation and Loading Motor Replacement

Master Cam Installation Procedure

Cassette Housing Assembly

VCR Electrical Circuitry Adjustments

Servo Circuit Adjustment: Head Switching Point

Adjusting the head switching point in the VCR servo circuit.

EP Still Picture Vertical Sync Adjustment

Procedure for adjusting vertical sync for EP still pictures.

VCR Troubleshooting Guide

VCR Power and Key Input Troubleshooting

Flowcharts for diagnosing VCR power and key-input issues.

Cassette Control and Loading Motor Troubleshooting

Flowcharts for cassette control, loading motor, and eject problems.

System Control and Capstan Motor Troubleshooting

Flowcharts for system control and capstan motor issues.

Reel Pulse, Head Switching, and Drum Motor Troubleshooting

Flowcharts for reel pulse, head switching, and drum motor problems.

Drum Servo Troubleshooting Flowchart

Flowchart for diagnosing drum servo system malfunctions.

Capstan Servo Troubleshooting Flowchart

Flowchart for diagnosing capstan servo system malfunctions.

E-E Mode and Recording Mode Troubleshooting

Flowcharts for E-E mode and recording mode signal issues.

Playback Mode Troubleshooting Flowchart

Flowchart for diagnosing playback mode failures.

Sound E-E and Recording Mode Troubleshooting

Flowcharts for sound E-E and recording mode signal issues.

Sound Playback Mode Troubleshooting Flowchart

Flowchart for diagnosing sound playback mode failures.

TV Troubleshooting Guide

Set Not Operating and No Raster Troubleshooting

Flowcharts for diagnosing TV set not operating and no raster issues.

No Picture/No Sound and Vertical Scan Troubleshooting

Flowcharts for diagnosing no picture/sound and vertical scan issues.

No Sound, No Playback Picture, and Sound Playback Troubleshooting

Flowcharts for diagnosing no sound, no playback picture, and sound playback issues.

Infrared Remote Control Troubleshooting

Flowchart for diagnosing infrared remote control operation failures.

Overall Schematic Diagram

Parts List Overview