Sharp WQ-740W User Manual

WQ-740W/WQ-780W
CONTENTS
Page
AC POWER SUPPLY CORD AND PLUG ...........................................................................................................................1
SPECIFICATIONS ...............................................................................................................................................................2
VOLTAGE SELECTION .......................................................................................................................................................2
FITTING OF DIAL POINTER ...............................................................................................................................................2
NAMES OF PARTS .............................................................................................................................................................3
DISASSEMBLY....................................................................................................................................................................4
ADJUSTMENT ..................................................................................................................................................................... 5
NOTES ON SCHEMATIC DIAGRAM ..................................................................................................................................6
VOLTAGE ............................................................................................................................................................................7
TYPES OF TRANSISTOR AND LED...................................................................................................................................7
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD................................................................................................. 8
PARTS GUIDE / EXPLODED VIEW
WQ-740W
WQ-780W
SERVICE MANUAL
SHARP CORPORATION
No. S7862WQ780W//
• In the interests of user-safety the set should be restored to its original
condition and only parts identical to those specified should be used.
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
WQ-740W
9FF24801830210
AC POWER SUPPLY CORD AND PLUG
9FF24801600292 9FF26802125210
9FF26802125120
WQ-780W
DIFFERENCE BETWEEN
WQ-740W AND WQ-780W
WQ-740W WQ-780W
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Sharp WQ-740W Specifications

General

Country	Japan
Manufacturer / Brand	Sharp
Model	WQ-740W
Type	Portable Stereo System
Power source	AC/DC
Frequency Range	AM: 530 - 1605 kHz
Wow and flutter	0.25% WRMS
Inputs	Microphone
Outputs	Headphones
Battery	8 x D batteries
Speakers	2-way, 4 speakers

Summary

Product Specifications

General, Radio, and Tape Recorder Details

Covers power, frequency range, and tape performance specifications.

Setup and Component Identification

Voltage Selection and Dial Pointer Fitting

Instructions for setting local voltage and installing the dial pointer.

External Parts Identification

Lists and diagrams external controls and features for both models.

Service and Repair Procedures

Disassembly Guide

Step-by-step instructions for dismantling the unit.

Adjustment and Calibration

Procedures for tuning the mechanism, tuner, and deck sections.

Technical Diagrams and Data

Notes on Schematic Diagrams

Explains symbols, notations, and conventions used in schematics.

Voltage Measurements

Lists critical voltage readings for various ICs in different modes.

Transistor and LED Types

Identifies common semiconductor components and their diagrams.

Parts Catalog and Schematics

Circuit Schematics and Wiring Diagrams

Provides detailed electrical diagrams and wiring layouts for troubleshooting.

Parts Guide and Exploded Views

Lists all replaceable parts with codes and shows physical assembly breakdown.