Philips MCM-275 Service Manual

Service

Micro System

Service Service

MCM275

all versions

Service

Service Manual

TABLE OF CONTENTS

From week 714 onwards, the CD Mechanism was changed to Dayang M93. New CD & MCU Board was used to match with the new CDM.

Please refer chapter 1 to 9 for sets produced before week 713 and chapter 10 & chapter 11 for sets produced in or after week 714.

Revision List ...........................................................................P12-1

COMPACT

DIGITAL AUDIO

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 SL 0819 Service Audio Printed in The Netherlands Subject to modification

Version 1.6

CLASS 1

LASER PRODUCT

3141 785 30336

VERSION VARIATIONS

√

VERSION VARIATIONS:

1-2

Type /Versions:

Board in used:

Display Board, RC Board,

Key Board,

Service policy

SW Board

Door Moter Board

AC Socket Board

HP JACK BOARD Speaker & Ant Board

CD & MCU BOARD AC POWER BOARD CD&MCU BOARD

MAIN BOARD

Type /Versions:

Features

RDS/NEWS VOLTAGE SELECTOR ECO STANDBY - DARK

* TIPS : C -- Component Lever Repair.

M -- Module Lever Repair

-- Used

Feature diffrence

MCM275

/05 /12

MM M M M M

/05 /12

/37

/55

CCCC CCCC

MCM275

/37

/55

/93

89/16/85/

M M M M M

89/16/85/

SPECIFICATIONS

GENERAL:

Mains voltage : 127/240V -15%+10% Switchable for /98

120V ± 10% for /37

230V ± 10% for /05/12

Mains frequency : 50/60Hz

Clock accuracy : < 4 seconds per day

Dimension centre unit :194(W)x269(H)x90(D) (mm)

1-3

Dynamic Bass Boost (DBB) : ON / OFF Input sensitivity

Aux in (at 1kHz) : 500mV at 600 Ω

USB : Host

Output sensitivity

Headphone output at 32 Ω : 10mW ± 2dB (Max. vol.)

Power consumption

Active : 20W

Standby : < 5.5W (DEMO mode)

ECO Power Standby : < 0.5W for /05/12/37

TUNER:

Tuning range : 87.5-108MHz

Grid : 50kHz for /98/12/05

100kHz for /98/55/37

IF frequency : 10.7MHz ± 20kHz

Aerial input : 75 Ω coaxial /05/12/98

300 Ω for /37

Sensitivity at 26dB S/N : < 22µf

Selectivity at 300kHz bandwidth : > 25dB

Image rejection : > 25dB [> 75dB]

IF rejection : > 60B [> 80dB]

Distortion at RF=1mV, dev. 75kHz : < 3%

-3dB Limiting point : < 23.5dBf

Crosstalk at RF=1mV, dev. 40kHz : > 18dB

COMPACT DISC:

Frequency response within ± 3dB : 125Hz - 16kHz

Output level (in Vrms) : 500mV, Z

= 100Ω

out

Signal/Noise ratio (unw.) : > 65dB

Signal/Noise ratio (A-weighted) : > 76dB

Distortion at 1kHz : < 0.02%

Channel unbalance (-40dB) : < ±2dB

Channel separation at 1kHz : > 30dB

Emphasis : 15/50 µS (switched

automatically by CD10)

THD Noise(1kHz,500mW) : < 1.0%

Volume attenuation(1kHz) : > 60dB

MP3 CD WMA:

MP3 : MPEG 1 (ISO/IEC 11172-3)

Layer3

MP3-CD Bit Rate : 8-320 kbps WMA-CD Bit Rate

: 64-192 kbps

Sampling Rate : 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48 kHz Format

: ISO9660, Joliet,UDF

ID3 : V1 tag/V2 2.0/V2 3.0

Language Support : English

Tuning range : 531-1602kHz for /05/12/55/98

530-1700kHz for /37/98

Grid : 9kHz for /05/12/55/98

10kHz for /37/98

IF frequency : 450kHz ± 1kHz

Aerial input : Frame aerial 18.1µH

Sensitivity at 26dB S/N : < 4.4mV/M

Selectivity at 300kHz bandwidth : > 18dB

IF rejection : > 45dB

Image rejection : > 28dB

Distortion at RF=50mV, M=80% : < 5%

AMPLIFIER:

Output power

L & R : 2 x 5.0W (4Ω, 1kHz, 10% THD)

:2 x 4.5W (4Ω, 1kHz, 10% THD) /98

:2 x 4.5W (FTC Power, 4Ω, 1kHz, 10% THD

63Hz-12.5kHz) /37

Frequency response within -3dB : 50Hz-16kHz

Digital Sound Control (DSC) : Jazz / Rock / Pop / Classic

[....] Values indicated are for /05/12 only.

MEASUREMENT SETUP

Tuner FM

1-4

Bandpass

LF Voltmeter

e.g. PM2534

RF Generator

e.g. PM5326

DUT

250Hz-15kHz

e.g. 7122 707 48001

Ri=50Ω

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=50Ω

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

Use Audio Signal Disc (replaces test disc 3)

DUT

SBC429 4822 397 30184

S/N and distortion meter

e.g. Sound Technology ST1700B

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

Recorder

Use Universal Test Cassette CrO2 SBC419 4822 397 30069

or Universal Test Cassette

LF Generator

e.g. PM5110

Fe SBC420 4822 397 30071

DUT

S/N and distortion mete

e.g. Sound Technology ST1700B

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

SERVICE AIDS

1-5

Service Tools:

Universal Torx driver holder .................................4822 395 91019

Torx bit T10 150mm ...........................................4822 395 50456

Torx driver set T6-T20 .........................................4822 395 50145

Torx driver T10 extended .....................................4822 395 50423

Compact Disc:

SBC426/426A Test disc 5 + 5A ...........................4822 397 30096

SBC442 Audio Burn-in test disc 1kHz .................4822 397 30155

SBC429 Audio Signals disc .................................4822 397 30184

Dolby Pro-logic Test Disc ....................................4822 395 10216

HANDLING CHIP COMPONENTS

ESD Equipment:

Anti-static table mat - large 1200x650x1.25mm ...4822 466 10953

anti-static table mat - small 600x650x1.25mm .....4822 466 10958

Anti-static wristband ............................................4822 395 10223

Connectorbox (1M Extension cable

(to connect wristband to conn.box) ..........4822 320 11305

Connecting cable

(to connect table mat to conn.box) ...........4822 320 11306

Earth cable (to Connect product to mat or box) --4822 320 11308 Complete kit ESD3

(combining all above products) ...............4822 320 10671

Wristband tester ...................................................4822 344 13999

Ω) ..........................................4822 395 11307

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.

ATTENTION

Tous les IC et beaucoup d’autres semi-conducteurs sont sensibles aux décharges statiques (ESD). Leur longévité pourrait être considérablement écourtée par le fait qu’aucune précaution n’est prise à leur manipulation. Lors de réparations, s’assurer de bien être relié au même potentiel que la masse de l’appareil et enfiler 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.

1-6

ESD

WARNUNG

Alle ICs und viele andere Halbleiter sind empfindlich gegenüber elektrostatischen Entladungen (ESD). Unsorgfältige Behandlung im Reparaturfall kan die Lebensdauer drastisch reduzieren. Veranlassen Sie, dass Sie im Reparaturfall über ein Pulsarmband mit Widerstand verbunden sind mit dem gleichen Potential wie die Masse des Gerätes. Bauteile und Hilfsmittel auch auf dieses gleiche Potential halten.

WAARSCHUWING

Alle IC’s en vele andere halfgeleiders zijn gevoelig voor electrostatische ontladingen (ESD). Onzorgvuldig behandelen tijdens reparatie kan de levensduur drastisch doen verminderen. 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 riparazioni occorre quindi essere collegato allo stesso potenziale che quello della massa dell’apparecchio tramite un braccialetto a resistenza. Assicurarsi che i componenti e anche gli utensili con quali si lavora siano anche a questo potenziale.

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

Veiligheidsbepalingen vereisen, dat het apparaat bij reparatie in zijn oorspronkelijke toestand wordt teruggebracht en dat onderdelen, identiek aan de gespecificeerde, worden toegepast.

Les normes de sécurité exigent que l’appareil soit remis à l’état d’origine et que soient utiliséés les piéces de rechange identiques à celles spécifiées.

Bei jeder Reparatur sind die geltenden Sicherheitsvorschriften zu beachten. Der Original zustand des Geräts darf nicht verändert werden; für Reparaturen sind Original-Ersatzteile zu verwenden.

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

CLASS 1

LASER PRODUCT

Invisible laser radiation when open. Avoid direct exposure to beam.

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

Warning !

Varning !

3122 110 03420

Le norme di sicurezza esigono che l’apparecchio venga rimesso nelle condizioni originali e che siano utilizzati i pezzi di ricambio identici a quelli specificati.

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

Varoitus !

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

DK Advarse !

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

1-7

INFORMATION ABOUT LEAD-FREE SOLDERING

Philips CE is producing lead-free sets from 1.1.2005 onwards.

IDENTIFICATION:

Regardless of special logo (not always indicated) one must treat all sets from 1 Jan 2005 onwards, according next rules:

Example S/N:

• Use only lead-free solder alloy Philips SAC305 with order code 0622 149 00106. If lead-free solder-paste is required, please contact

the manufacturer of your solder-equipment. In general use of solder-paste within workshops should be avoided because paste is not easy to store and to handle.

• Use only adequate solder tools applicable for lead-free solder alloy. The solder tool must be able

• Adjust your solder tool so that a temperature around

• Mix of lead-free solder alloy / parts with leaded solder alloy / parts is possible but PHILIPS recommends strongly to avoid mixed

• Use only original spare-parts listed in the Service-Manuals. Not listed standard-material (commodities) has to be purchased at

• Special information for BGA-ICs:

• For sets produced before 1.1.2005 (except products of 2004), containing leaded solder-alloy and components, all needed spare-parts

• On our website www.atyourservice.ce.Philips.com

o To reach at least a solder-temperature of 40 o To stabilize the adjusted temperature at the solder-tip o To exchange solder-tips for different applications.

solder-joint should not exceed ~ 4 sec. Avoid temperatures above 400 otherwise wear-out of tips will rise drastically and flux-fluid will be destroyed. To avoid wear-out of tips switch off un-used equipment, or reduce heat.

solder alloy types (leaded and lead-free). If one cannot avoid or does not know whether product is lead-free, clean carefully the solder-joint from old solder alloy and re-solder with new solder alloy (SAC305).

external companies.

- always use the 12nc-recognizable soldering temperature profile of the specific BGA (for de-soldering always use the lead-free temperature profile, in case of doubt)

- lead free BGA-ICs will be delivered in so-called 'dry-packaging' (sealed pack including a silica gel pack) to protect the IC against moisture. After opening, dependent of MSL-level seen on indicator-label in the bag, the BGA-IC possibly still has to be baked dry. (MSL=Moisture Sensitivity Level). This will be communicated via AYS-website. Do not re-use BGAs at all.

will be available till the end of the service-period. For repair of such sets nothing changes.

BGA-de-/soldering (+ baking instructions)

∗

Heating-profiles of BGAs and other ICs used in Philips-sets

∗

Bottom line of typeplate gives a 14-digit S/N. Digit 5&6 is the year, digit 7&8 is the week number, so in this case 2005 wk12

So from 0501 onwards = from 1 Jan 2005 onwards

Important note you avoid mixing solder-alloys (leaded/ lead-free). So best to always use SAC305 and the higher temperatures belong to this.

Due to lead-free technology some rules have to be respected by the workshop during a repair:

: In fact also products of year 2004 must be treated in this way as long as

− is reached and stabilized at the solder joint. Heating-time of the

you find more information to:

For additional questions please contact your local repair-helpdesk.

You will find this and more technical information within the "magazine", chapter "workshop news".

SERVICE INSTRUCTION

Safety regulations require that after a repair, the set must be returned in its original condition. Pay in particular attention to the following points:

· Route the wire trees correctly and fix them with the mounted cable clamps.

· Check the insulation of the AC Power lead for external damage.

· Check the strain relief of the AC Power cord for proper function.

· Check the electrical DC resistance between the AC Power Plug and the secondary side (only for sets which have a AC Power isolated power supply):

1. Unplug the AC Power cord and connect a wire between the two pins of the AC Power plug.

2. Set the AC Power switch to the "on" position (keep the AC Power cord unplugged!).

3. Measure the resistance value between the pins of the AC Power plug and the metal shielding of the tuner or the aerial connection on the set. The reading should be larger than 4.5 Mohm (For U.S. it should be between

4.2 Mohm and 12 Mohm).

4. Switch "off" the set, and remove the wire between the two pins of the AC Power plug.

• Check the cabinet for defects, to avoid touching of any

inner parts by the customer.

PREP ARATIONS AND CONTROLS

Preparation

Setting the clock

After connecting MCM275 to the power supply,

set the clock first.

Press and hold STANDBY-ON/ ECO

POWER to switch the set to Standby mode

The display shows the set time

-- --:-- -- flashes by default if you have not set

the clock

In the standby mode, press and hold DISPLAY/

CLOCK on the remote control

SET CLOCK scrolls on the display

24 HR or 12 HR appears for the initial

clock setting. To select 24-hour clock or

12-hour clock,

On the remote control, press VOLUME +/-

once or more (or turn VOLUME on the

set)

On the remote control, press DISPLAY/

CLOCK to confirm

The hours digits star t flashing

Hold down or press VOLUME +/- repeatedly

to set the hours (or turn VOLUME on the

set)

Press DISPLAY/CLOCK to confirm

The minutes digits start flashing

Hold down or press VOLUME +/- repeatedly

to set the minutes (or turn VOLUME on the

set)

Press DISPLAY/CLOCK to confirm

– To exit without storing the clock setting press

STOP 9

Helpful hints:

– The clock setting will be erased when the system

is disconnected from the power supply.

– The set will exit from the clock setting mode if

no button is pressed within 90 seconds.

–To set the clock automatically by using a time

signal which is broadcast together with the RDS

signal see chapter RDS: Automatic clock

setting via RDS.

USB

Using the remote control

IMPORTANT!

– Remove the

protective plastic tab

before using the

remote control.

– Always point the

remote control directly

towards IR area.

Notes for remote control:

– First select the source you wish to

control by pressing one of the source select

keys on the remote control (for example

CD, TUNER).

–Then select the desired function (for

example

ÉÅ

To replace the remote controls’

battery

CAUTION!

– Remove the battery if it is exhausted

or will not be used for a long time.

– Batteries contain chemical substances,

so they should be disposed of properly.

Press and hold 1 as indicated.

Simultaneously, pull the battery tray at 4.

Remove the old battery and put a new CR2025

battery in place.

Put back the battery tray.

1-8

PREP ARATIONS AND CONTROLS

Controls

STANDBY-ON/ ECO POWER

– press briefly to switch the set on or off (standby/

ECO POWER);

– In standby or Eco Power mode: press and

hold to toggle between Standby and ECO

POWER mode (power-saving mode)

– Red indicator: lights up red when the set is

switched to ECO POWER mode

SOURCE

–selects sound source CD, USB, TUNER or

AUX

– In standby or Eco Power mode: switches the

set on and selects sound source CD, USB,

TUNER or AUX

–sensor for the infrared remote control

Helpful hints: Always point the remote control

towards this sensor.

PUSH OPEN

– push to unfold or fold the control panel

CD OPEN • CLOSE 0

– opens/closes the CD door

CD door

VOLUME

–adjusts the volume level

– Clock/Timer: adjusts the hours and minutes

– 3.5 mm headphone socket

Helpful hints:

– Adjust the volume to a moderate level

before you plug in the headphones.

– Connecting headphones will switch off the

speakers.

ALBUM/ PRESET + /-

– CD/USB: selects albums (for MP3/WMA only)

– TUNER: selects a preset radio station

4 / ¢

– CD/USB: skips or searches CD tracks/titles

backwards/forwards

– Tu n er : tunes to radio stations

– CD/USB: starts or pauses playback

DBB (Dynamic Bass Boost)

– turns the bass enhancement on/off

DSC (Digital Sound Control)

–selects predefined sound settings: ROCK,

JAZZ, POP, CLASSIC

PROGRAM

– CD/USB: programs tracks

– Tuner: programs preset radio stations

STOP

– CD/USB: stops playback; erase a program

AUX-IN

– connects to the AUDIO OUT jack on the

external appliance

– jack for the external USB mass storage device

Remote control

USB

AUX

– selects the audio input from an additional

connected appliance

– In standby or Eco Power mode:: switches the

set on and selects the audio input from an

additional connected appliance

VOLUME +/-

– adjusts the volume level

– Clock/Timer: adjusts the hours and minutes

TIMER

–displays the timer setting

– switches the timer on/off

– enters the timer setting mode (press and hold

for more than 2 seconds)

SLEEP

– set the sleep timer

MUTE

– switches the sound off temporarily

RDS/NEWS

– Tu ne r : selects RDS (Radio Data System)

information

– CD/USB/AUX: activates/deactivates news

SHUFFLE

– selects random playback

REPEAT

– selects continuous playback

DSC (Digital Sound Control)

–selects predefined sound settings: ROCK,

JAZZ, POP, CLASSIC

DBB (Dynamic Bass Boost)

– turns the bass enhancement on/off

PROGRAM

– CD/USB: programs tracks

– Tun e r: programs preset radio stations

DISPLAY/CLOCK

– Clock: - displays the set time

- In standby mode: enters the clock

setting mode (press and hold for more

than 2 seconds)

– TUNER/Audio CD: switches between clock

display and playback

display

– MP3/WMA files: displays disc information

during playback

Notes for remote control:

– First select the source you wish to

control by pressing one of the source select

keys on the remote control (for example

CD, TUNER).

–Then select the desired function (for

example

ÉÅ

–press briefly to switch the set on or off (standby/

ECO POWER);

– In standby or Eco Power mode: press and

hold to toggle between Standby and ECO

POWER mode (power-saving mode)

Source buttons

USB

–selects USB source

– In standby or Eco Power mode:: switches the

set on and selects USB source.

–selects CD source

– In standby or Eco Power mode:: switches the

set on and selects CD source.

TUNER

– selects TUNER source and toggles between the

wavebands: FM and MW

– In standby or Eco Power mode:: switches the

set on and selects TUNER source

Controls

1-9

CONTROLS & INSTALLATIONS

4 / ¢

– CD/USB: skips or searches CD tracks

backwards/forwards

– Tuner: tunes to radio stations

ALBUM/ PRESET 3 / 4

– CD/USB: selects the next/previous album (for

MP3/WMA only)

– TUNER: selects a preset radio station

ÉÅ

– CD/USB: starts or pauses playback

– CD/USB: stops playback; erase a program

OPEN • CLOSEç

– opens/closes the CD door

Controls Installation

Placing MCM275

With the detachable stand and by-packed wall

mounting kit , MCM275 allows you to place it in

two ways: on desktops with stand or on

walls without stand.

Mounting stand onto the set

MCM275 is equipped with a stand. To mount

the stand onto the set,

Put MCM275 on a flat and firm surface, rear side

facing up

As shown, align the stand to the slots at set’s

bottom, 4 FRONT facing down

P RE

FR O NT

FRONT

P R E SS

Push the stand down into the slots

When the stand is in place, you will hear a

click

See Appendix: How to mount your

MCM275 onto walls to learn more about

wall mounting.

Mounting MCM275 onto walls

Installation

MW loop

antenna

Speaker

(left)

Speaker

(right)

FM wire

antenna

AC power cord

Rear connections

Warning:

– Never make or change connections with

the mains supply switched on.

– Install your set near the AC outlet and

where the AC power plug can be reached

easily.

Speaker connections

Use the supplied speakers only. Using other

speakers can damage the set or the sound

quality will be negatively affected.

Connect the cable of the left speaker to LEFT

(red and black) and the cable of the right

speaker to RIGHT (red and black) as follows:

a. Press the clip of the red terminal and fully

insert the stripped portion of the colored (or

marked) speaker cable into the socket, then

release the clip

b. Press the clip of the black terminal and fully

insert the stripped portion of the black (or

unmarked) speaker cable into the socket, then

release the clip

Antenna connections

MW antenna

Assemble the loop antenna as shown:

1-10

CONTROLS & INSTALLATIONS

Installation

Fit the plug of the loop antenna to AM (MW)

ANTENNA as shown below

Adjust the position of the antenna for optimal

reception (as far away as possible from the TV,

VCR or other radiation sources)

FM antenna

The wire antenna supplied can only be used to

receive nearby stations. For better reception we

recommend using a cable antenna system or an

outdoor antenna.

Extend the wire antenna and fit it to FM

ANTENNA as shown below

ANTENNA

Insert the loop antenna into the slot on the set

Note: If you are using a cable antenna system or

an outdoor antenna, fit the antenna plug, instead of

the wire antenna, to FM ANTENNA .

By connecting a USB mass storage device

(including USB flash memory, USB flash players

or memory cards) to the Hi-Fi system, you can

enjoy the device’s stored music through the

powerful speakers of Hi-Fi system.

Check you have unfolded the control panel

Insert the USB device’s USB plug into the socket

on the set ‘s foldable control panel

Move the antenna in different positions for

optimal reception (as far away as possible from

the TV, VCR or other radiation sources)

Fix the antenna’s end to the wall

Connecting an additional

appliance

Connecting a USB device or memory

card

for the devices with USB cable:

a. Insert one plug of the USB cable (not

supplied) to the socket

on the set ‘s

foldable control panel

b. Insert the other plug of the USB cable to the

USB output terminal of the USB device

for the memory

card:

a. Insert the memory card into a card reader

(not supplied)

b. Use a USB cable (not supplied) to connect

the card reader to the socket

on the set ‘s foldable control panel

Installation

Using AC power

Make sure all the connections have been made

before switching on the power supply

Connect the AC power cord to the wall socket.

This switches on the power supply

When MCM275 is switched to standby, it is still

consuming some power. To disconnect the

system from the power supply completely,

remove the power plug from the wall

socket.

The type plate is located on the rear of the

set.

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

instructions.

Warning!

To avoid overheating of the system, a safety

circuit has been built in. Therefore, your

system may switch to Standby mode

automatically under extreme conditions. If

this happens, let the system cool down

before reusing it (not available for all versions).

This product complies with the radio

interference requirements of the European

Community.

CAUTION

Visible and invisible laser radiation. If the

cover is open, do not look at the beam.

High voltage! Do not open. You run the risk

of getting an electric shock.

The machine does not contain any user-

serviceable parts.

Modification of the product could result in

hazardous radiation of EMC or other

unsafe operation.

Select AUX mode on the set

Helpful hints:

–Always refer to the owner’s manual of other

equipment for complete connection.

Connecting a non-USB device

It is possible to use an additional appliance, e.g.

TV, VCR or CD recorder with the set. On

MCM275, you can playback music from an

external source.

Follow the Step 1 under Connecting a USB

device or memory card

Insert one plug of the audio cable (not supplied)

to the socket AUX IN on the set ‘s foldable

control panel

Connect the other end of the audio cable to the

AUDIO OUT terminal of the additional

appliance

1-11

English

Troubleshooting

WARNING

Under no circumstances should you try to repair the system yourself, as this will invalidate the

warranty. Do not open the system as there is a risk of electric shock.

If a fault occurs, first check the points listed below before taking the system for repair. If you

are unable to remedy a problem by following these hints, consult your dealer or Philips for

help.

“NO DISC” is displayed.

Some files on the USB device are not

displayed.

Radio reception is poor.

The system does not react when buttons

are pressed.

Sound cannot be heard or is of poor

quality.

The left and right sound outputs are

reversed.

Problem

Solution

Insert a disc.

Wait until the moisture condensation at the lens

has cleared.

Replace or clean the disc, see “Maintenance”.

Use a finalised CD-RW or a correct MP3/WMA

-CD format disc.

Check if the number of folders exceeds 99 or

the number of titles exceeds 999

If the signal is too weak, adjust the antenna or

connect an external antenna for better

reception.

Increase the distance between the Micro HiFi

System and your TV or VCR.

Remove and reconnect the AC power plug and

switch on the system again.

Adjust the volume.

Disconnect the headphones.

Check that the speakers are connected correctly.

Check if the stripped speaker wire is clamped.

Make sure the MP3-CD was recorded within

32~256 kbps bit rate with sampling frequencies

at 48 kHz, 44.1 kHz or 32 kHz.

Check the speaker connections and location.

The remote control does not function

properly.

The timer is not working.

The Clock/Timer setting is erased.

Select the source (CD or TUNER, for example)

before pressing the function button (ÉÅ,í,

ë).

Reduce the distance between the remote

control and the system.

Insert the batter y with its polarities

(+/– signs) aligned as indicated.

Replace the battery.

Point the remote control directly toward

IR sensor on the front of the system.

Check the set is switched off

Set the clock correctly.

Press TIMER to switch on the timer.

Power has been interrupted or the power cord

has been disconnected. Reset the clock/timer.

Troubleshooting

TROUBLESHOOTING

1-12

DISMANTLING INSTRUCTIONS

2-1 2-1

Dismantling the Rear Portion and PCBs

1) Press the 2 juts and pull out the Stand as shown in figure

Figure 1

Figure 2

Dismantling the Rear Portion and PCBs

5) Loosen 2 screws E to remove the Bracket Jack Board as shown in Figure 4.

6) Loosen 3 screws F to remove the Main Board as shown in figure 5.

Figure 4

2) Loosen 5 screws A and 6 screws B to remove the Rear Cabinet as shown in figure 2.

3) Loosen 3 screws C to remove the SP & ANT Jack Board as shown in figure 3.

4) Loosen 5 screws D to remove the Power Module as shown in figure 3.

Figure 5

Dismantling of the Display Lens & the Volume knob

1) Use a flat head screw driver to give a push in the direction as shown in figure 6.

2) Place two small screw drivers in between the front cabinet & knob to give more leverage in pulling out the Volume Knob as shown in figure 7.

Figure 3

Figure 7

Figure 6

Dismantling of the CD Module & CD Door Carrier

1) Loosen 5 screws J mounting the Key Board to the Front Cabinet to remove the Key Board as shown in figure 8.

2) Loosen 4 screws H and 3 screws G to CD Module as shown in figure 8.

3) Loosen 2 screws I to remove the Servo Motor Mechanism as shown in figure 8.

2-2

Service pos A

Figure 8

4) Loosen 4 screws K to remove the Right CD Door Carrier and 4 screws L to remove the Left CD Door Carrier as shown in figure 9.

Service pos B

Figure 9

Note: After re-assembly, it is very important to ensure all

wires are routed properly to ensure that they do not touch/obstruct all moving parts.

SERVICE TEST PROGRAM

3-1

KEY TEST

Button pressed?

Display shows

Table 1

To enter Service

Testprogram hold

PLAY & Door Open/Close

buttons

depressed while

plugging mainscord in.

Display shows the

MCU version

"MCU-V

yy"

(Main menu)

Figure 1

Door switch is ignored → CD door can be opened.

V refers to Version

yy refers to Software version number of the uProcessor (counting up from 01 to 99)

DISPLAY TEST

Button pressed?

Display shows Figure 1 All display flags on.

Button pressed?

Display shows alternate

segment display from SEG0

to SEG64.

ADC TEST

DBB

Button pressed?

Display shows "ADC0 Value"

for ADC0

(Input Line - For key scanning)

DBB

Button pressed?

Display shows "ADC1 Value"

for ADC1

(Input Line - ioNTC Heat detection for transformer)

Various

other Tests

TEST

EEPROM CLEAR A test pattern will be sent to the EEPROM.

LEAVE SERVICE TEST PROGRAM

Activated with

PROGRAM

to Exit

Disconnect mains cord

ACTION

"EEP CLR" is displayed while the erase processing.

Caution! All presets from the customer will be lost!!

KeyNr Set key KeyNr Set key KeyNr Set key

Key test table

0 CD 10 RDS 20 PROGRAM

1 AUX 11

2 TUNER 12 CLOCK/DISP

LAY

3 SOURCE 13 ALBUM + SLEEP

STANDBY/ON

OPEN/CLOSE

VOLUME DOWN

14 ALBUM - TIMER

SKIP PREV 25 DBB

16 SKIP NEXT 26 DSC

7 VOLUME UP 17 NULL 27 MUT E

8 NULL 18 NULL 28 USB

9 NULL 19 REPEAT

Table 1

21 SHUFFLE

22 NULL

23 24

Button pressed?

No Display shows

Button pressed?

ADC Test is used for checking the ADC inputs to the microprocessor.

The display shows an ADC value between 0 and 255 for an input signal between 0 and 5V.

DBB

Button pressed?

Display shows "ADC2 Value"

for ADC2

(Input Line - Rotary volume)

DBB

Button pressed?

Display shows "ADC3 Value"

for ADC3

(Input Line - Door switch status)

DBB

Button pressed?

Display shows "ADC4 Value"

for ADC4

(Input Line - Version detection)

Button pressed?

SET BLOCK DIAGRAM

4-1

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