Philips Micro Hi-Fi System MCM285 Bedienungsanleitung

Version 1.1

MCM285

3141 785 32741

Micro Hi-Fi System -/55/77/79

Published by LX 1016 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

Disassembly diagram............ ........................................................3-1

Block diagram................................................................................4-1

Wiring diagram ..............................................................................4-2

Main board

Circuit diagram .........................................................................5-1

Layout diagram..................................................................5-2..5-3

Key board

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

Layout diagram..................................................................6-2..6-3

Exploded view diagram .................................................................7-1

Mechanical parts list......................................................................7-2

Electrical parts list...................................................................8-1..8-2

Revision list.....................................................................................9-1

SPEAKERS

1-way Bass Reflex System

Impedance ........................................................................ 8 Ω

Speaker diameter ............................................................. 4”

Dimensions (w x h x d)..........14.6x23.6x18.5 (cm)

GENERAL

AC Power ........................... 110 – 127 / 220 – 240 V;

....................................................... 50/60 Hz Switchable

Dimensions (w x h x d) ....... 14.6x23.6x23.9 (cm)

Weight (with/without speakers) ..................................

................................................................................. 5.9 / 2.5 kg

Specifications and external appearance are

subject to change without notice.

AMPLIFIER

Total output power

........................................... 25 W (12.5 W per channel)

Signal-to-noise ratio .......................... ≥62 dBA (IEC)

Frequency response ......... 63 – 16000 Hz, ± 3 dB

CD PLAYER

Frequency range .................................. 63 – 16000 Hz

Signal-to-noise ratio ............................................ 65 dBA

TUNER

FM wave range ................................... 87.5 – 108 MHz

MW wave range ................................ 531 – 1602 kHz

TECHNICAL SPECIFICATION

1 - 2

1-3

LF Generator

e.g. PM5110

Recorder

Use Universal Test Cassette CrO2 SBC419 4822 397 30069

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

S/N and distortion met

e.g. Sound Technology ST170

DUT

or Universal Test Cassette Fe SBC420 4822 397 30071

LEVEL METER

e.g. Sennheiser UPM550

with FF

filter

S/N and distortion meter

e.g. Sound Technology ST1700B

DUT

Use Audio Signal Disc

(replaces test disc 3)

SBC429 4822 397 30184

Bandpass

250Hz-15kHz

e.g. 7122 707 48001

LF Voltmeter

e.g. PM2534

DUT

S/N and distortion meter

e.g. Sound Technology ST1700B

Frame aerial

e.g. 7122 707 89001

Tuner AM (MW,LW)

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 250Hz) to eliminate hum (50Hz, 100Hz).

RF Generator

e.g. PM5326

Ri=50:

Bandpass

250Hz-15kHz

e.g. 7122 707 48001

LF Voltmeter

e.g. PM2534

DUT

RF Generator

e.g. PM5326

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).

Ri=50:

Tuner FM

MEASUREMENT SETUP

1-4

SERVICE AIDS

GB WARNING

All ICs and many other semi-conductors 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 wrist wrap with resistance.

Keep components and tools also at this

potential.

ESD

CLASS 1

LASER PRODUCT

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 !.

Lead free

Set remains closed!

Play a CD

for at least 10 minutes

playability

ok ?

playability

ok ?

add Info for customer

"SET OK"

check playability

playability

ok ?

check playability

return set

Customer complaint

"CD related problem"

"fast" lens cleaning

3For flap loaders (= access to CD drive possible)

cleaning method 4is recommended

INSTRUCTIONS ON CD PLAYABILITY

2 - 1

Exchange CDM

1-4For description - see following pages

PLAYABILITY CHECK

For sets which are compatible with CD-RW discs

use CD-RW Printed Audio Disc ....................7104 099 96611

TR 3 (Fingerprint)

TR 8 (600µ Black dot) maximum at 01:00

• playback of these two tracks without audible disturbance

playing time for: Fingerprint 10seconds

Black dot from 00:50 to 01:10

• jump forward/backward (search) within a reasonable time

For all other sets

use CD-DA SBC 444A..................................4822 397 30245

TR 14 (600µ Black dot) maximum at 01:15

TR 19 (Fingerprint)

TR 10 (1000µ wedge)

• playback of all these tracks without audible disturbance

playing time for: 1000µ wedge 10seconds

Fingerprint 10seconds

Black dot from 01:05 to 01:25

• jump forward/backward (search) within a reasonable time

CUSTOMER INFORMATION

It is proposed to add an addendum sheet to the set which

informs the customer that the set has been checked

carefully - but no fault was found.

The problem was obviously caused by a scratched, dirty or

copy-protected CD. In case problems remain, the customer

is requested to contact the workshop directly.

The lens cleaning (method 3) should be mentioned in the

addendum sheet.

The final wording in national language as well as the printing

is under responsibility of the Regional Service Organizations.

LIQUID LENS CLEANING

Because the material of the lens is synthetic and coated

with a special anti-reflectivity layer, cleaning must be done

with a non-aggressive cleaning fluid. It is advised to use

“Cleaning Solvent

The actuator is a very precise mechanical component and

may not be damaged in order to guarantee its full function.

Clean the lens gently (don’t press too hard) with a soft and

clean cotton bud moistened with the special lens cleaner.

The direction of cleaning must be in the way as indicated in

the picture below.

Before touching the lens it is advised to clean the

surface of the lens by blowing clean air over it.

This to avoid that little particles make scratches on

the lens.

INSTRUCTIONS ON CD PLAYABILITY

2 - 2

SET BLOCK DIAGRAM

4 - 1 4 - 1

SET WIRING DIAGRAM

4 - 2 4- 2

5 - 15 - 1

CIRCUIT DIAGRAM - MAIN BOARD

5 - 2 5 - 2

LAYOUT DIAGARM - MAIN BOARD

COMPONENT SIDE VIEW

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