Philips MC-138 Service manual

Micro System

MC138/all

Page

Handling chip components ...........................................1-1

Technical Specifications ...............................................2-1

Service Tool ..................................................................2-1

Measurement setup .....................................................2-2

Connections and Controls ................................... 3-1.. 3-2

Disassembly diagram ...................................................4-1

Pin description of ICs ...........................................4-2 ..4-4

Set Block diagram ........................................................5-1

Set Wiring diagram .......................................................5-2

Combi board - Circuit diagram

LCD/HP/KEY/POWER board ....................................6-1

Tuner board ...............................................................6-2

Main board ................................................................6-3

Combi borad - Layout diagram ...........................6-4 .. 6-5

CD board - Circuit diagram ..........................................7-1

CD board - Layout diagram ..........................................7-2

Cassette board - Circuit diagram .................................8-1

Cassette board - Layout diagram .................................8-2

Set Mechanical Exploded view ...................................9-1

Service parts list ............................................... 10-1..10-2

Revision list ................................................................11-1

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise without the prior permission of Philips.

Published by YM 0519 Service Audio Printed in The Netherlands Subject to modification

Version 1.1

HANDLING CHIP COMPONENTS

ANDLING CHIP COMPONENTS

1 - 1

WARNING

All ICs and many other semiconductors are susceptible to electrostatic discharges (ESD). Careless handling during repair can reduce life drastically. When repairing, make sure that you are connected with the same potential as the mass of the set via a wristband with resistance. Keep components and tools at this potential.

ATTENTION

Tous les IC et beaucoup d´autres semi-conducteurs sont sensibles aux décharges statiques (ESD). Leur longévite pourrait être considérablement écourtée par le fait qu´aucune précaution nést prise à leur manipulation. Lors de réparations, s´assurer de bien être relié au même potentiel que la masse de l´appareil et enfileer le bracelet serti d´une résistance de sécurité. Veiller à ce que les composants ainsi que les outils que l´on utilise soient également à ce potentiel.

Safety regulations require that the set be restored to its original condition and that parts which are identical with those specified be used. Safety components are marked by the symbol

Les normes de sécurité exigent que l`appareil soit remis à l`état d`origine et que soient utilisées les pièces de rechange identiques à celles spécifiées. Les composants de sécurité sont marqués

Alle ICs und viele andere Halbleiter sind empfindlich gegenüber elektrostatischen Entladungen (ESD). Unsorgfältige Behandlung im Reparaturfall kann die Lebensdauer drastisch reduzieren. Sorgen Sie dafür, daß Sie im Reparaturfall über ein Pulsarmband mit Widerstand mit dem Massepotential des Gerätes verbunden sind. Halten Sie Bauteile und Hilfsmittel ebenfalls auf diesem Potential.

Bei jeder Reparatur sind die geltenden Sicherheitsvorschriften zu beachten. Der Originalzustand des Gerätes darf nicht verändert werden. Für Reparaturen sind Originalersatzteile zu verwenden. Sicherheitsbauteile sind durch das Symbol markiert.

WARNUNG

ESD

SAFETY

WAARSCHUWING

Alle IC´s en vele andere halfgeleiders zijn gevoelig voor electrostatische ontladingen (ESD). Onzorgvuldig behandelen tijdens reparatie kan de levensduur drastisch doen vermindern. Zorg ervoor dat u tijdens reparatie via een polsband met weerstand verbonden bent met hetzelfde potentiaal als de massa van het apparaat. Houd componenten en hulpmiddelen ook op ditzelfde potentiaal.

AVVERTIMENTO

Tutti IC e parecchi semi-conduttori sono sensibili alle scariche statiche (ESD). La loro longevità potrebbe essere fortemente ridatta in caso di non osservazione della più grande cauzione alla loro manipolazione. Durante le riparationi occorre quindi essere collegato allo stesso potenziale che quello della massa delápparecchio tramite un braccialetto a resistenza. Assicurarsi che i componenti e anche gli utensili con quali si lavora siano anche a questo potenziale.

Veiligheidsbepalingen vereisen, dat het apparaat in zijn oorspronkeliijke toestand wordt teruggebracht en dat onderdelen, identiek aan de gespecificeerde, worden toegepast. De Veiligheidsonderdelen zijn aangeduid met het symbool

Le norme di sicurezza estigono che l´apparecchio venga rimesso nelle condizioni originali e che siano utilizzati i pezzi di ricambiago identici a quelli specificati. Componenty di sicurezza sono marcati con

DANGER: Invisible laser radiation when open. AVOID DIRECT EXPOSURE TO BEAM.

Varning !

Osynlig laserstrålning när apparaten är öppnad och spärren är urkopplad. Betrakta ej strålen.

Advarsel !

Usynlig laserstråling ved åbning når sikkerhedsafbrydere er ude af funktion. Undgå udsaettelse for stråling.

CLASS 1

LASER PRODUCT

Varoitus !

Avatussa laitteessa ja suojalukituksen ohitettaessa olet alttiina näkymättömälle laserisäteilylle. Älä katso säteeseen !

After servicing and before returning the set to customer perform a leakage current measurement test from all exposed metal parts to earth ground, to assure no shock hazard exists. The leakage current must not exceed 0.5mA.

"Pour votre sécurite, ces documents doivent être utilisés par des spécialistes agréés, seuls habilités à réparer votre appareil en panne".

2 - 1

SERVICE MEASUREMENT

2 - 2

Tuner FW

RF Generator

e.g. PM5326

DUT

Bandpass

250Hz-15kHz

e.g. 7122 707 48001

LF Voltmeter

e.g. PM2534

Ri=50

S/N and distortion meter

e.g. Sound Technology ST1700B

Use a bandpass filter to eliminate hum (50Hz, 100Hz) and disturbance from the pilottone (19kHz, 38kHz).

Tuner AM (MW,LW)

RF Generator

e.g. PM5326

Ri=50

DUT

Frame aerial

e.g. 7122 707 89001

Bandpass

250Hz-15kHz

e.g. 7122 707 48001

LF Voltmeter

e.g. PM2534

S/N and distortion meter

e.g. Sound Technology ST1700B

To avoid atmospheric interference all AM-measurements have to be carried out in a Faraday«s cage. Use a bandpass filter (or at least a high pass filter with 250kHz) to eliminate hum (50Hz, 100Hz).

CD RECORDER

Use Audio Signal Disc SBC429 4822 397 30184 (replaces test disc 3)

DUT

S/N and distortion meter

e.g. Sound Technology ST1700B

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

Use Universal Test Cassette Fe SBC420 4822 397 30071

LF Generator

e.g. PM5110

DUT

Ri=50

S/N and distortion meter

e.g. Sound Technology ST1700B

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

CONTROLS AND CONTROLS

3 - 1

RW COMPATIBLE

R/CD

CD/CD

263

CONTROLS AND CONTROLS

3 - 2

Preparations

Before using the remote control

Pull out the plastic protective sheet.2Select the source you wish to control by

pressing one of the source select keys on the

FM Antenna

Extend coil antenna at the back of the unit fully

for optimum reception.CSpeakers Connection

VOL

SLEEP

SHUFFLE

REPEAT

™ ).

¡ ,

remote control (for example CD, TUNER).3Then select the desired function (for example

2 ,

Front Speakers

Connect the speaker wires to the SPEAKERS

terminals, right speaker to "RIGHT" and left

speaker to "LEFT", coloured (marked) wire to

slightly to the right.

PULL

PUSH

Replacing battery (lithium

CR2025) into the remote control

Pull out the knob

Pull out the battery compar tment

Replace a new battery and fully inser t the

battery compar tment back to the original

position.

speaker terminals.

"+ " and black (unmarked) wire to "- ".

Fully insert the stripped portion of the speaker

wire into the terminal as shown.

Notes:

– For optimal sound performance, use the

supplied speakers.

– Do not connect more than one speaker to any

one pair of

– Do not connect speakers with an impedance

lower than the speakers supplied. Please refer to

the SPECIFICATIONS section of this manual.

CAUTION!

Batteries contain chemical substances, so

they should be disposed off properly.

Preparations

Antennas Connection

Connect the supplied AM loop antenna and FM

antenna to the respective terminals. Adjust the

position of the antenna for optimal reception.

AM Antenna

Rear connections

The type plate is located at the rear of the

system.

For users in the U.K.: please follow the

instructions on page 2.

Powe r

Before connecting the AC power cord to the

wall outlet, ensure that all other connections

have been made.

WARNING!

– For optimal performance, use only the

original power cable.

– Never make or change any connections

with the power switched on.

To avoid overheating of the system, a safety

circuit has been built in. Therefore, your

system may switch to Standby mode

Position the antenna as far as possible from a TV,

VCR or other radiation source.

automatically under extreme conditions. If

this happens, let the system cool down

before reusing it (not available for all versions).

DISASSEMBLY DIAGRAM

4 - 1 4 - 1

4 - 2

+ 17 hidden pages

Philips MC-138 Service manual

TABLE OF CONTENTS

SERVICE MEASUREMENT

CONTROLS AND CONTROLS

DISASSEMBLY DIAGRAM