Sharp CD-PC1881V - User Manual

– 1 –
CD-PC1881V
No. S0961CDPC1881
CD-PC1881V
• In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified be
used.
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
CD-PC1881V Video CD Mini System consisting of CD-PC1881V
(main unit), CP-C881 (front speakers), CP-SW881 (sub woofer),
GBOXS0026AWM1 (center speaker) and GBOXS0027AWM1
(surround speakers).
CONTENTS
Page
SAFETY PRECAUTION FOR SERVICE MANUAL ........................................................................................................... 2
VOLTAGE SELECTION..................................................................................................................................................... 2
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR ................................................................................................. 2
SPECIFICATIONS ..............................................................................................................................................................3
NAMES OF PARTS ........................................................................................................................................................... 4
OPERATION MANUAL ...................................................................................................................................................... 7
DISASSEMBLY.................................................................................................................................................................. 8
REMOVING AND REINSTALLING THE MAIN PARTS................................................................................................... 11
ADJUSTMENT ................................................................................................................................................................. 12
BLOCK DIAGRAM ........................................................................................................................................................... 15
SCHEMATIC DIAGRAM .................................................................................................................................................. 18
VOLTAGE ........................................................................................................................................................................ 30
WIRING SIDE OF P.W.BOARD....................................................................................................................................... 31
NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 38
TYPES OF TRANSISTOR AND LED............................................................................................................................... 38
WAVEFORMS OF CD CIRCUIT...................................................................................................................................... 39
TROUBLESHOOTING (CD SECTION) ........................................................................................................................... 40
FUNCTION TABLE OF IC................................................................................................................................................ 44
FL SEGMENT ...................................................................................................................................................................56
PARTS GUIDE/EXPLODED VIEW
NTSC/PAL
Manufactured under license from Dolby Laboratories Licensing
Corporation.
DOLBY, the double-D symbol
and “PRO LOGIC” are
trademarks of Dolb
y
Laboratories Licensin
g
Corporation.

Sharp CD-PC1881V Specifications

General

Brand	Sharp
Model	CD-PC1881V
Category	Micro Music System
Language	English

Summary

Service Safety Precautions

Laser Safety Precautions

Essential safety guidelines for servicing the laser pickup and unit, emphasizing eye protection.

Specifications Overview

Amplifier Section Specifications

Disassembly Procedures

Adjustment Procedures

Dolby Pro Logic Explanation

Block Diagrams

Block Diagram (1;3)

Visual representation of the unit's internal circuitry connections.

Block Diagram (2;3)

Visual representation of the tuner and audio processing circuitry.

Block Diagram (3;3)

Visual representation of the system control and power supply circuitry.

Schematic Diagrams

Schematic Diagram (1;12)

First part of the main PWB circuit diagram showing Dolby Pro Logic and audio processing.

Schematic Diagram (2;12)

Second part of the circuit diagram showing tape playback and recording amplifier circuits.

Schematic Diagram (3;12)

Third part of the circuit diagram focusing on tape playback amplifier components.

Schematic Diagram (4;12)

Fourth part of the circuit diagram showing the tuner front end and PLL sections.

Schematic Diagram (5;12)

Fifth part of the circuit diagram detailing the display driver and switch functions.

Schematic Diagram (6;12)

Sixth part of the circuit diagram for the LED drivers and microcomputer interface.

Schematic Diagram (7;12)

Seventh part of the circuit diagram covering the power amplifier stages.

Schematic Diagram (8;12)

Eighth part of the circuit diagram showing power transformers and voltage regulators.

Schematic Diagram (9;12)

Ninth part of the circuit diagram for the CD mechanism servo and motor control.

Schematic Diagram (10;12)

Tenth part of the circuit diagram showing CD mechanism control interfaces.

Schematic Diagram (11;12)

Eleventh part of the circuit diagram for the MPEG controller and video interface.

Schematic Diagram (12;12)

Twelfth part of the circuit diagram for the MPEG decoder and video circuitry.

Voltage Measurement Guide

IC and Component Voltages

Lists voltage readings for numerous ICs and transistors throughout the unit.

Printed Circuit Board Wiring

Tuner PWB-G Wiring

Detailed wiring and component placement diagram for the tuner board.

Main PWB-A1 Wiring

Component placement and wiring diagram for the main PWB.

Display PWB-A2 and Switch PWB-A3 Wiring

Component placement and wiring for display and switch control boards.

Power PWB-C Wiring

Component placement and wiring diagram for the power supply board.

CD Video PWB-B Wiring (Top View)

Top view component placement and wiring diagram for the CD video processing board.

CD Video PWB-B Wiring (Bottom View)

Bottom view component placement and wiring diagram for the CD video processing board.

CD Circuit Waveforms

CD Section Troubleshooting

Troubleshooting CD Functionality Failures

Guides for diagnosing and resolving issues with the CD playback function.

CD Troubleshooting - Further Steps

Troubleshooting General CD Function Failures

Integrated Circuit (IC) Function Tables

IC1 Servo Amplifier Function Table (1;2)

Pinout and function table for the IC1 servo amplifier.

IC1 Servo Amplifier Function Table (2;2)

Continued pinout and function table for IC1 servo amplifier.

IC2 Servo;Signal Control Function Table (1;2)

Pinout and function table for IC2 servo/signal control IC.

IC2 Servo;Signal Control Function Table (2;2)

Continued pinout and function table for IC2 servo/signal control IC.

IC Block Diagrams

IC2 MPEG Decoder Block Diagram

Block diagram for IC2 MPEG decoder IC.

IC4 Video Operation Amplifier Block Diagram

IC3 Servo Driver Block Diagram

Block diagram for IC3, the servo driver IC.

ICV2 MPEG Decoder Block Diagram

Block diagram for ICV2 MPEG decoder IC.

ICV4 Video Operation Amplifier Block Diagram

ICV3 DRAM Block Diagram

Block diagram for ICV3 DRAM IC.

IC Function Tables

IC701 Microcomputer Function Table (1;2)

Pinout and function table for IC701 microcomputer.

IC701 Microcomputer Function Table (2;2)

Continued pinout and function table for IC701 microcomputer.

ICV1 MPEG Controller Function Table

Pinout and function table for ICV1 MPEG controller IC.

ICV2 MPEG Decoder Function Table (1;2)

ICV2 MPEG Decoder Function Table (2;2)

Parts Ordering and Code Explanations

Comprehensive Parts List

Integrated Circuits (ICs) List

Transistors List

Diodes List

Capacitors List

Resistors List

Resistors List (Continued)

Exploded Views

CD Mechanism Exploded View

Cabinet Exploded View (1;2)

Cabinet Exploded View (2;2)

Front Speaker Exploded View