Daewoo MCM240 Service Manual

Service

Micro System

Service Manual

Service Service

Service

MCM240/21/21M/22/25/37

TABLE OF CONTENTS

Page

Location of pc boards & Version variations................1-2

Technical Specifications .............................................1-3

Measurement setup ....................................................1-4

Service Aids, Safety Instruction, etc................ 1-5 to 1-6

Lead-free Information & Service Instruction ..............1-7

Preparations & Controls & Troubleshooting.. 1-8 to 1-10

Disassembly Instructions & Service positions .............. 2

Service Test Programs ............................................... 3-1

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

Set Wiring diagram .....................................................5-1

Power Board .................................................................. 6

Key Board ...................................................................... 7

Main Board .................................................................... 8

Set Mechanical Exploded view & parts list ................... 9

COMPACT

DIGITAL AUDIO

CLASS 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 SL 0529 Service Audio Printed in The Netherlands Subject to modification

Version 1.0

LASER PRODUCT

3141 785 30330

LOCATION OF PRINTED CIRCUIT BOARDS

D AR

1-2

HEADPHONE BOARD

OP/CL BO

MAIN BOARD

KEY BOARD

ANTENNA BOARD

VOL BOARD

SPEAKER BOARD

POWER BOARD

VERSION VARIATIONS:

Type /Versions: MC240

/21

Features & Board in used:

Aux in / CDR in x x x x x

Line Out

Video Out

Surround Out

Subwoofer Out

Power Booster Out

Digital Out

Digital in

Matrix Surround

RDS x x

News x x

Dolby Pro Logic (DPL)

Incredible Surround

Karaoke Features

Voltage Selector x

ECO Power Standby (LCD Display Off) x x

ECO6 Tuner Board - Systems Non-Cenelec x x

ECO6 Tuner Board - Systems Cenelec x x

USB PC LINK

/21M /22 /25 /37

SPECIFICATIONS

GENERAL:

Mains voltage : 120/240V ± 15% Switchable for /21

120V ± 10% for /37

230V ± 10% for /22/25

240V ± 10% for /30

Mains frequency : 50/60Hz

Clock accuracy : < 4 seconds per day

Dimension centre unit : 250 x 245 x 96 (mm)

Power consumption

Active : 15W for /21/21M/22/25/37/30

Standby : < 6W (DEMO mode off)

ECO Power Standby : < 1W for /22/25

TUNER:

Tuning range : 87.5-108MHz

Grid : 50kHz

100kHz for /21/37

IF frequency : 10.7MHz ± 20kHz

Aerial input : 75 Ω coaxial

300 Ω for /37

Sensitivity at 26dB S/N : < 22dBf

Selectivity at 300kHz bandwidth : > 33dB

Image rejection : > 20dB [> 25dB]

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

-3dB Limiting point : < 23.5dB

Crosstalk at RF=1mV, dev. 40kHz : > 26dB

1-3

Input sensitivity

Aux in (at 1kHz) : 500mV at 600 Ω

Output sensitivity

Headphone output at 32 kΩ : 15mW ± 2dB (Max. vol.)

COMPACT DISC:

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

Output level (in Vrms) : 500mV, Z

Signal/Noise ratio (A-weighted) : > 58dBA

Distortion at 1kHz : < 0.02%

Channel unbalance at 1kHz : < ±3dB

Channel separation at 1kHz : > 30dB

Emphasis : 15/50 µS (switched

automatically by CD10)

THD Noise(1kHz) : < 1.0%

Outband Attenuation : > 35dB

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, 96 kHz Format

[....] Values indicated are for /22/25 only.

: ISO9660, Joliet

= 100Ω

out

Tuning range : 531-1602kHz

530-1700kHz for /21/37

Grid : 9kHz

10kHz for /21/37

IF frequency : 450kHz ± 1kHz

Aerial input : Frame aerial 18.1µH

Sensitivity at 26dB S/N : < 4.0mV/M

[> 3.25mV/M]

Selectivity at 300kHz bandwidth : > 20dB

IF rejection : > 24dB

Image rejection : > 20dB [> 28 dB]

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

AMPLIFIER:

Output power

L & R : 2 x 5W (4Ω, 1kHz, 10% THD)

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

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

Dynamic Bass Boost (DBB) : ON / OFF

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

Use Audio Signal Disc

DUT

L

R

SBC429 4822 397 30184

S/N and distortion meter

e.g. Sound Technology ST1700B

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

(replaces test disc 3)

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

Cassette:

SBC419 Test cassette CrO2 ................................. 4822 397 30069

SBC420 Test cassette Fe ..................................... 4822 397 30071

MTT150 Dolby level 200nWb/M ............................ 4822 397 30271

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

Connector box (1MΩ) ............................................ 4822 320 11307

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

1-6

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.

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.

WARNING

ATTENTION

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.

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.

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.

WAARSCHUWING

AVVERTIMENTO

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

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

De Veiligheidsonderdelen zijn aangeduid met het symbool

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.

Less composants de sécurité sont marqués

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.

Sicherheitsbauteile sind durch das Symbol

markiert.

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.

Componenty di sicurezza sono marcati con

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.

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

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

Warning !

Varning !

Varoitus !

Advarse !

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.

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

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.

PREPARATIONS AND CONTROLS

Preparations

Rear connections

The type plate is located at the rear of the

system.

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

instructions .

Pow er

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

automatically under extreme conditions. If

this happens, let the system cool down

before reusing it (not available for all versions).

Antennas Connection

Connect the supplied MW loop antenna and FM

antenna to the respective terminals. Adjust the

position of the antenna for optimal reception.

MW Antenna

Position the antenna as far as possible from a TV,

VCR or other radiation source.

MW loop antenna

Speaker

(right)

Speaker

(left)

FM wire antenna

AC power cord

plastic

protective

sheet

FM Antenna

For better FM stereo reception, connect an

outdoor FM antenna to the FM ANTENNA

terminal.

Speakers Connection

Front Speakers

Connect the speaker wires to the SPEAKERS

terminals, right speaker to "RIGHT" and left

speaker to "LEFT", colored (marked) wire to "+"

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 +/- speaker terminals.

– Do not connect speakers with an impedance

lower than the speakers supplied. Please refer to

the SPECIFICATIONS section of this manual.

Optional connection

The optional equipment and connecting cords are

not supplied. Refer to the operating instructions

of the connected equipment for details.

Connecting other equipment to your

system

Connect the audio left and right OUT terminals

of a TV, VCR, Laser Disc player, DVD player or

CD Recorder to the AUX terminals.

Note:

– If you are connecting equipment with a mono

output (a single audio out terminal), connect it to

the AUX left terminal. Alternatively, you can use a

“single to double” cinch cable (the output sound

still remain mono).

Before using the remote control

Pull out the plastic protective sheet.

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

2 ; , ¡ ™ , ).

Replacing battery (lithium

CR2025) into the remote control

Pull out the knob A slightly to the left.

Pull out the battery compar tment B .

Replace a new battery and fully inser t the

battery compar tment back to the original

position.

CAUTION!

Batteries contain chemical substances, so

they should be disposed of properly.

Preparations

1-8

PREPARATIONS AND CONTROLS

)

(

Controls

Controls on the system and

remote control

STANDBY-ON/ ECO POWER (B)

– switches the system on or to Eco Power

standby/normal standby with clock display.

Display screen

– shows the status of the system.

OPEN • CLOSE √/

– opens/closes the CD door.

– remote sensor

VOLUME (3 / 4 ) (+/-)

– adjusts the volume level.

– adjusts the hours and minutes for the clock/timer

function.

CD Door

Mode Selection

ALBUM/ TUNE/ALBUM -/+ ( 5 / 6 )

for TUNER ........ tunes to a station

for CD/MP3-CD fast searches back and

forward within a track/disc (press

and hold).

for MP3-CD .....skips to the beginning of a

current/previous/subsequent

album.

9 ............................. stops disc playback or erases a

disc programme.

2 ; ................... star ts or interrupts playback.

PRESET (

)

for TUNER ........ selects a preset radio station.

for CD/MP3 -CD skips to the beginning of a

current/previous/subsequent

track

DBB (Dynamic Bass Boost)

– enhances the bass.

BAND

– selects a waveband.

PROGRAM

for CD/MP3-CD programmes tracks and

reviews the programme.

for TUNER ........ programmes tuner stations.

SOURCE

– selects the respective sound source for CD/

TUNER/ AUX.

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

2 ;

DISPLAY/CLOCK

– sets the clock function.

– displays disc information during playback.

TIMER

– activates/ deactivates or sets the timer function.

SLEEP

– activates/deactivates or selects the sleeper time.

DSC (Digital Sound Control)

– selects sound characteristics: ROCK/ JAZZ/

POP/ CLASSIC.

RDS

–for tuner, displays RDS information.

MUTE

– interrupts and resumes sound reproduction.

REPEAT

– repeats a track/disc programme/entire disc.

(

SHUFFLE

– plays disc tracks in random order.

)

–connects headphones

1-9

TROUBLESHOOTING

Important notes for users in the

U.K.

Mains plug

This apparatus is fitted with an approved 13

Amp plug. To change a fuse in this type of plug

proceed as follows:

Remove fuse cover and fuse.

Fix new fuse which should be a BS1362 3 Amp,

A.S.T.A. or BSI approved type.

Refit the fuse cover.

If the fitted plug is not suitable for your socket

outlets, it should be cut off and an appropriate

plug fitted in its place.

If the mains plug contains a fuse, this should

have a value of 3 Amp. If a plug without a fuse

is used, the fuse at the distribution board

should not be greater than 3 Amp.

Note: The severed plug must be disposed of to

avoid a possible shock hazard should it be

inserted into a 13 Amp socket elsewhere.

How to connect a plug

The wires in the mains lead are coloured with

the following code: blue = neutral (N),

brown = live (L).

∂ As these colours may not correspond with the

colour markings identifying the terminals in

your plug, proceed as follows:

– Connect the blue wire to the terminal

marked N or coloured black.

– Connect the brown wire to the terminal

marked L or coloured red.

– Do not connect either wire to the earth

terminal in the plug, marked E (or e) or

coloured green (or green and yellow).

Before replacing the plug cover, make certain

that the cord grip is clamped over the sheath

of the lead - not simply over the two wires.

Recording and playback of material may

require consent. See Copyright Act 1956 and

The Performer’s Protection Acts 1958 to 1972.

Norge

Typeskilt finnes på apparatens underside.

Observer: Nettbryteren er sekundert

innkoplet. Den innebygde netdelen er

derfor ikke frakoplet nettet så lenge

apparatet er tilsluttet nettkontakten.

For å redusere faren for brann eller elektrisk

støt, skal apparatet ikke utsettes for regn eller

fuktighet.

Italia

DICHIARAZIONE DI CONFORMITA’

Si dichiara che l’apparecchio MCM240 Philips

risponde alle prescrizioni dell’ar t. 2 comma 1

del D.M. 28 Agosto 1995 n. 548.

Fatto a Eindhoven

Philips Consumer Electronics

Philips, Glaslaan 2

5616 JB Eindhoven, The Netherlands

CAUTION

Use of controls or adjustments or

performance of procedures other than

herein may result in hazardous

radiation exposure or other unsafe

operation.

VAROITUS

Muiden kuin tässä esitettyjen

toimintojen säädön tai asetusten

muutto saattaa altistaa vaaralliselle

säteilylle tai muille vaarallisille

toiminnoille.

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.

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.

The remote control does not function

properly.

The timer is not working.

The Clock/Timer setting is erased.

Insert a disc.

Check if the disc is inserted upside down.

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-CD

format disc.

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.

Select the source (CD or TUNER, for example)

before pressing the function button ( 2; ,¡ ,

™ ).

Reduce the distance between the remote

control and the system.

Insert the battery with its polarities

(+/– signs) aligned as indicated.

Replace the battery.

Point the remote control directly toward

IR sensor on the front of the system.

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.

Problem

Solution

1-10

+ 23 hidden pages