Philips MCM103/96 - User Manual

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Version 1.4

MCM103

3141 785 34454

Micro Hi-Fi System

/98/96/93

Published by LX 1125 Service Audio Subject to modification

system or transmitted, in any form or by any means, electronic, mechanical, photocopying,

or otherwise without the prior permission of Philips.

CONTENTS

Technical specification ..................................................................1-2

Service measurement setup..........................................................1-3

Service aids .................................................................................1-4

Instructions on CD playability ................................................2-1..2-2

Block diagram................................................................................3-1

Wiring diagram...............................................................................4-1

Disassembly diagram............ ........................................................5-1

Main board

Circuit diagram ..................................................................6-1..6-4

Layout diagram..................................................................6-5..6-6

Display board

Circuit diagram .........................................................................7-1

Layout diagram..................................................................7-2..7-3

AMP board

Circuit diagram .........................................................................8-1

Layout diagram.........................................................................8-2

Exploded view diagram .................................................................9-1

Mechanical parts list......................................................................9-2

Electrical parts list........................................................................10-1

MCM103B

/77/12

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This document is a service manual for the Philips Micro Hi-Fi System, models MCM103, MCM103B, and their regional variants (MCM103/98/96/93, MCM103B/77/12). It provides technical specifications, measurement setups, service aids, and detailed diagrams for repair and maintenance.

Function Description

The Philips Micro Hi-Fi System is a compact audio system designed for playing various audio sources. It features a CD player, an AM/FM tuner, and an auxiliary input, allowing users to enjoy music from CDs, radio broadcasts, and external devices. The system also supports USB Direct playback, enabling users to play digital audio files directly from USB storage devices. The amplifier delivers stereo sound through two speakers, making it suitable for personal listening environments.

Important Technical Specifications

Amplifier

Rated Output Power: 2x5W RMS
Frequency Response: 60 - 16kHz, ±3dB
Signal to Noise Ratio: >65dB
Total Harmonic Distortion: <1%
Aux Input: 0.5 V RMS 20kohm

Speakers

Impedance: 4ohm
Speaker Driver: 3.5"
Sensitivity: >82dB/m/W

Disc

Laser Type: Semiconductor
Disc Diameter: 12cm/8cm
Support Disc: CD-DA, CD-R, CD-RW, MP3-CD, WMA-CD
Audio DAC: 24Bits / 44.1kHz
Total Harmonic Distortion: <1%
Frequency Response: 60Hz - 16kHz (44.1kHz)
S/N Ratio: >65dBA

Tuner

Tuning Range: FM: 87.5 - 108 MHz
Tuning Grid: 50 KHz
Sensitivity (Mono, 26 dB S/N Ratio): < 22 dBf
Search Selectivity: < 36 dBu

General Information

AC Power: 110-127/220-240 V, 50/60 Hz
Operation Power Consumption: 20 W
Standby Power Consumption: < 4 W
USB Direct: Version 2.0/1.1
Main Unit Dimensions (W x H x D): 150 x 152 x 250 mm
Speaker Box Dimensions (W x H x D): 150 x 152 x 197 mm
Weight (With Packing): 5.14 kg
Weight (Main Unit): 2.002 kg
Weight (Speaker Box): 2 x 0.895 kg

Usage Features

The Micro Hi-Fi System is designed for ease of use with its multi-source playback capabilities. Users can switch between CD, FM/AM radio, and auxiliary input modes. The USB Direct feature allows for convenient playback of MP3 and WMA files from compatible USB devices. The system's compact size makes it suitable for various living spaces. Some models may include RDS (Radio Data System) for enhanced radio listening, and a "Dark" ECO Standby mode for reduced power consumption and display brightness during standby.

Maintenance Features

The service manual provides comprehensive guidance for technicians to maintain and repair the device. Key maintenance features include:

Disassembly Diagrams: Detailed instructions and illustrations for dismantling the bottom cabinet, front cabinet, and PCB boards, facilitating access to internal components for repair.
Circuit Diagrams: Extensive circuit diagrams for the Main Board (Parts 1-4), Display Board, and AMP Board, showing the interconnections and components, essential for troubleshooting and component-level repair.
Layout Diagrams: Visual representations of the Main Board (Top and Bottom Side), Display Board (Top and Bottom Side), and Power Board, aiding in component identification and placement.
Parts Lists: Mechanical and Electrical Parts Lists, including specific part numbers for various components, ensuring correct replacement during repairs.
CD Playability Instructions: A flowchart and detailed instructions for diagnosing and resolving CD playability issues, including lens cleaning procedures and recommended test discs (SBC429, SBC444A, CD-RW Printed Audio Disc).
Measurement Setup: Guidelines for setting up measurements for Tuner FM, Tuner AM (MW, LW), CD, and Recorder functions, ensuring accurate performance verification after repairs.
Service Aids: Important warnings regarding Electrostatic Discharge (ESD) and instructions for handling sensitive components, as well as information on lead-free soldering practices adopted by Philips.
Safety Instructions: Emphasizes restoring the set to its original condition after repair, checking wiring, insulation, strain relief, and electrical resistance, and inspecting the cabinet for defects to ensure user safety.
Version Variation Table: A table outlining different board configurations and service policies (Component Level Repair, Module Level Repair, Used) across various product versions (e.g., /05, /96, /55, B/77, B/12, /93, /98), helping technicians identify the correct parts and procedures for specific models.