Daewoo MCM240 Service Manual

Service

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

©

Copyright 2005 Philips Consumer Electronics B.V. Eindhoven, The Netherlands

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

GB

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

x

x

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:

FM

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

MW

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).

CD

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

GB

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.

F

WARNING

ATTENTION

ESD

D

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.

NL

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

I

AVVERTIMENTO

GB

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

!

.

NL

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

!

F

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

!

D

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.

I

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

GB

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

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

SF

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

DK

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

S

Warning !

Varning !

Varoitus !

Advarse !

GB

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.

F

"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 .

A

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).

B

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.

C

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

1

Pull out the plastic protective sheet.

2

Select the source you wish to control by

pressing one of the source select keys on the

remote control (for example CD, TUNER).

3

Then select the desired function (for example

2 ; , ¡ ™ , ).

Replacing battery (lithium

CR2025) into the remote control

1

Pull out the knob A slightly to the left.

2

Pull out the battery compar tment B .

3

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

)

1

3

4

6

7

8

9

5

!

0

2

^

(

1

!

7

0

8

*

%

@

3

#

$

&

5

Controls

Controls on the system and

remote control

1

STANDBY-ON/ ECO POWER (B)

– switches the system on or to Eco Power

standby/normal standby with clock display.

2

Display screen

– shows the status of the system.

3

OPEN • CLOSE √/

– opens/closes the CD door.

4

IR

– remote sensor

5

VOLUME (3 / 4 ) (+/-)

– adjusts the volume level.

– adjusts the hours and minutes for the clock/timer

function.

6

CD Door

7

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 (

J

/

K

)

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

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

current/previous/subsequent

track

8

DBB (Dynamic Bass Boost)

– enhances the bass.

9

BAND

– selects a waveband.

0

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 ;

,

J

,

K

).

@

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.

)

n

–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:

1

Remove fuse cover and fuse.

2

Fix new fuse which should be a BS1362 3 Amp,

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

3

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.

Copyright in the U.K.

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

2-1

2-1

DISMANTLING INSTRUCTIONS

Dismantling of the Rear Portion

1) Remove 11 screws A and B as indicated to remove the
Rear Cabinet.

2) Remove 2 screws C as indicated to loosen the Speaker
Wire Holder.

3) Remove 2 screws D as indicated to loosen the Speaker
Board .

4) Remove 2 screws E as indicated to loosen the AUX IN
jack.

Dismantling of the Front Boards and CD Door

1) Loosen 3 screws G each to remove the CD Mechanism
Holder Bracket.

2) Loosen 7 screws F1 and F2 as indicated to remove the
Main Board.

3) Remove 3 screws H as indicated to loosen the Gear Motor
Module.

4) Loosen 4 screws I (see Figure 3) to remove the Key_C
Board.

5) Loosen 2 screws J (see Figure 3) to remove the Display
Board.

DISMANTLING INSTRUCTIONS

Repair Hints & Service Positions

Note: The flex cables are very fragile, care should be taken

not to damage them during repair. After repair, be
very sure that the flex cables are inserted properly
into the flex sockets before encasing, otherwise faults
may occurs.

Service position A

Service position B

Figure 1

Figure 3

6) Loosen 4 screws K (see Figure 3) to remove the Key_B
Board.

7) Loosen 8 screws L (see Figure 3) to remove the Key_A
Board.

8) Loosen 8 screws M (see Figure 3) to remove the Door Eject
Lever Bracket Right/Left, then remove CD door.

Figure 4

Figure 5

Service position C

Figure 2

Figure 6

SERVICE TEST PROGRAM

3-1

To start service test program

hold VOL DN button
depressed then STOP
button depressed in
standby mode

3-1

Display shows the

ROM version
"VX--XX OTP MCM240
XX-XX-2005"

V refers to Version

X--XX refers to Software version number of the uProcessor
eg. V1-7E

XX-XX-200X

refers to Date, eg. 25-5-2005

SET BLOCK DIAGRAM

4-1

4-1

SET WIRING DIAGRAM

5-1

5-1

6-1

POWER BOARD

6-1

Printed Circuit Board - Side A

The board is not intented to be repaired on component level.

Circuit Diagram and Printed Circuit Board drawings

are published for orientation only.

In case of defects please replace the entire board.

The board can be ordered with codenumber "9940 000 02866" for /21/21M/37.

"9940 000 02867" for /22/25.

Printed Circuit Board - Side A

CIRCUIT DIAGRAM

6-2

6-2

7-1

7-1

LAYOUT DIAGRAM - OPEN/CLOSE BOARD
TOP SIDE

KEY BOARD

The board is not intented to be repaired on component level.

Circuit Diagram and Printed Circuit Board drawings

are published for orientation only.

In case of defects please replace the entire board.

The board can be ordered with codenumber "9940 000 02868" for /21/21M/37.

"9940 000 02869" for /22/25.

LAYOUT DIAGRAM - OPEN/CLOSE BOARD
BOTTOM SIDE

LAYOUT DIAGRAM - VOLUME BOARD
TOP SIDE

LAYOUT DIAGRAM - VOLUME BOARD
BOTTOM SIDE

LAYOUT DIAGRAM - KEY BOARD
TOP SIDE

7-2

7-2

LAYOUT DIAGRAM - KEY BOARD
BOTTOM SIDE

CIRCUIT DIAGRAM

7-3

7-3

8-1

+

−

MAIN BOARD

8-1

BLOCK DIAGRAM - AM/FM IF + FM STEREO DETECTOR
TA2099N

TABLE OF CONTENTS

Internal IC Diagram ............................................... 8-1 to 8-3

Main Board Layout Top View ........................................... 8-4

Main Board Layout Bottom View ..................................... 8-5

Circuit Diagram - MCU Part ............................................. 8-6

Circuit Diagram - CD Part ................................................ 8-7

Circuit Diagram - MP3 Part ............................................. 8-8

Circuit Diagram - Amp Part.............................................. 8-9

Circuit Diagram - Tuner Part.......................................... 8-10

Layout Diagrams ........................................................... 8-11

BLOCK DIAGRAM - 2-CHANNEL AUDIO
AMPLIFIER TFA9842J

V

CC

9

4

IN1+

60 kΩ

1

IN2+

60 kΩ

CIV

MODE

3

V

7

TFA9842J

REF

STANDBY

MUTE

ON

SHORT-CIRCUIT

AND

TEMPERATURE

PROTECTION

V

CC

0.5V

CC

PIN CONFIGURATION - 2-CHANNEL AUDIO
AMPLIFIER TFA9842J

8

OUT1

+

IN2

1

2

OUT2

6

SVR

OUT2−

OUT1+

CIV

IN1+

GND

SVR

MODE

V

CC

2

3

4

5

6

7

8

9

TFA9842J

GND

5

8-2 8-2

BLOCK DIAGRAM - CD Player Processor
TC94A14FA

48

DV

49

SS3

Clock

generator

1-bit

DAC

DV

DD3

DV

RO

LO

50

51

52

53

LPF

PW M

Servo control

A/D

D/A

BLOCK DIAGRAM - SYSTEM ELECTRONIC VOLUME
TC9422N

33 47 46 45 44 43 42 41 40 39 38 37 36 35 34

TEZI

32

TEI

31

SBAD

30

FEI

29

28

RFRP

DV

ZDET

V

BUS0

BUS1

BUS2

BUS3

BUC

/CCE

/RST

V

SS3

SS5

DD5

54

55

56

57

58

59

60

61

62

63

64

1 16 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Micro-

controlle r

interface

Audio out

circuit

Address

circuit

16 k

RAM

Digita l output

ROM

Digita l equalizer

RAM

adjustment circuit

CLV servo

Synchronous

guarantee

EFM

decoder

Sub code

decoder

automatic

Data

slicer

VCO

PLL

TMAX

27

26

25

24

23

22

21

20

19

18

17

RFZI

RFCT

V

DD3

RFI

SLCO

V

SS3

VCOF

PV

REF

LPFO

LPFN

TMAX

8-3

BLOCK DIAGRAM - MICROCONTROLLER UNIT
TMP87PP23F

8-3

LAYOUT DIAGRAM - MAIN BOARD
TOP SIDE

8-4

8-4

LAYOUT DIAGRAM - MAIN BOARD
BOTTOM SIDE

8-5

8-5

CIRCUIT DIAGRAM - MAIN BOARD
MCU PART

8-6

8-6

CIRCUIT DIAGRAM - MAIN BOARD
CD PART

8-7

8-7

CIRCUIT DIAGRAM - MAIN BOARD
MP3 PART

8-8 8-8

CIRCUIT DIAGRAM - MAIN BOARD
AMP PART

8-9 8-9

CIRCUIT DIAGRAM - MAIN BOARD
TUNER PART

8-10

8-10

8-11 8-11

LAYOUT DIAGRAM - HEADPHONE BOARD
TOP SIDE

LAYOUT DIAGRAM - HEADPHONE BOARD
BOTTOM SIDE

LAYOUT DIAGRAM - SPEAKER BOARD
TOP SIDE

LAYOUT DIAGRAM - SPEAKER BOARD
BOTTOM SIDE

LAYOUT DIAGRAM - MOTOR BOARD

LAYOUT DIAGRAM - ANTENNA BOARD

LAYOUT DIAGRAM - SWITCH BOARD

LAYOUT DIAGRAM - LED BOARD
TOP SIDE

LAYOUT DIAGRAM - LED BOARD
BOTTOM SIDE

SET EXPLODED VIEW

9-1

9-1

031

68

43

47

008

68

032

029

025

027

61

64

68

43

63

59

38

022

027

021

020

024

019

43

43

26

016

19

018

19

41

30

28

017

51

68

68

43

028

64

63

027

026

024

012

011

12

007

013

48

28

023

004

002

28

015

19

014

009

5

12

006

005

5

003

MCM240 SCREW LIST

HARDEN SCREW BTTB 3x8mm AB68

63
61

MACHINE SCREW MS/KH 3x8mm HD 5mm

59

NUT ID:3 OD:5.5 T:2.3mm

SCREW TA/BWH 3x10mm (HD:12mm)

51

SELF-TAPPING SCREW TA/WH 3x12mm

48

47

HARDEN SCREW TT/PH 3x4 2

HARDEN SCREW BTTB 3x12 AB

43

41

MACHINE SCREW MS/BH 3x4 mm

28

19

HARDEN SCREW BTTB 2x8 MC

12

SELF-TAPPING SCREW TA/KH 2.6x8mm

5

SELF-TAPPING SCREW TA/KH 1.4x3.5 mm

ITEM

9
4SELF-TAPPING SCREW TA/WH 3x10mm(H D:10mm)
2

2

1

2

14

1

2SELF-TAPPING SCREW TB/KH 3x8 HD5mm 38
15HARDEN SCREW BTTB 2.6x8mm MC

17

8

6

QTYDESCRIPTION

001

9-2 9-2

MECHANICAL & ACCESSORIES PARTSLIST

001 994000002809 CD DOOR LENS W/HOT FOIL 994000000275 RCA PIN JACK

002 994000002805 CD DOOR COVER -LEFT 994000000317 AC CORD CUL 6FT /37

003 994000002806 CD DOOR COVER -RIGHT 994000000512 AC CORD BS PLUG 2M /25

004 994000002804 CD DOOR CARRIER 994000002819 AC CORD 2.4M /21/21M/22

005 994000002811 CONTL PANEL LENS W/HOT FOIL 994000002824 REMOTE CONTROL UNIT

006 994000002803 FRONT CABINET /21/21M/30 994000002825 SPEAKER BOX L+R

006 994000002863 FRONT CABINET /22/25

006 994000002831 FRONT CABINET /37

007 994000000305 SENSOR LENS

008 994000000321 POWER /CD OPEN BUTTON

009 994000000322 VOL +/- BUTTON

011 994000002822 CD MECHANISM DA23Z1

012 994000002816 SHOCK ABSORBER (BLACK)

013 994000002817 SHOCK ABSORBER (GRAY) Note: Only these parts mentioned in the list are

014 994000000324 FUNCTION BUTTON D./B./S./P./S. normal service parts.

!

!

!

ELECTRICAL PARTSLIST

C317 994000002856 E.CAP 4700UF 16V +-20% Q208 994000002834 TRANSISTORS MMBT3904LT1

C319 994000001346 E.CAP 4700UF 25V +-20% Q209 994000002834 TRANSISTORS MMBT3904LT1

CF201 994000000245 BAND PASS FILTER Q210 994000002834 TRANSISTORS MMBT3904LT1

CF204 994000002857 CERAMIC FILTER SFU450B Q211 994000002834 TRANSISTORS MMBT3904LT1

FS300 994000000588 FUSE T800mA/250V /21/21M/37 Q212 994000002834 TRANSISTORS MMBT3904LT1

FS301 994000000585 CERAMIC FUSE 2A/250V Q213 994000002834 TRANSISTORS MMBT3904LT1

FS302 994000000586 GLASS FUSE 3.15A/250V Q214 994000002835 TRANSISTORS MMBT3906LT1

FS303 994000002865 SUBMINI. FUSE 200mA/250V /22 Q215 994000002834 TRANSISTORS MMBT3904LT1

IC1 994000002842 IC MM1469PH Q301 994000001193 TRANSISTORS KSB772YS

IC101 994000002844 IC TA2157FN Q302 994000002834 TRANSISTORS MMBT3904LT1

IC102 994000002849 IC TC94A14FAG Q402 994000002834 TRANSISTORS MMBT3904LT1

IC103 994000002853 IC XC61FC3012MR Q403 994000002834 TRANSISTORS MMBT3904LT1

IC105 994000001197 IC KA7805 Q404 994000002834 MMBT3904LT1/21/21M/37

IC201 994000002846 IC TC9257F Q404 994000002835 MMBT3906LT1 /22/25

IC202 994000002843 IC TA2099N Q405 994000002834 TRANSISTORS MMBT3904LT1

!

!

!

!

015 994000000323 FUNCTION BUTTON STOP/PLAY

016 994000002837 LCD DISPLAY

017 994000002814 DRIVE BELT

018 994000002808 DRIVER PULLEY GEAR

019 994000002807 DRIVING GEAR

020 994000002832 MOTOR BRACKET

021 994000002818 DOOR MOTOR PULLY

022 994000002815 DC MOTOR 5V

023 994000000597 TRANSFORMER 120/230V /21/21M

023 994000000278 TRANSFORMER 230V /22/25

!

!

023 994000000316 TRANSFORMER EI-57 120V /37

024 994000000284 RUBBER FOOT

025 994000000281 RCA JACK BD 2P (RD/WH)

026 994000000592 REAR CABINET /21

026 994000000291 REAR CABINET /22/25

026 994000000319 REAR CABINET /37

027 994000000283 SPEAKER HOLDER

028 994000002813 RUBBER FOOT 24x11x1.6mm

029 994000002812 UNIT STAND

031 994000002823 AM/FM ANT 75R ASS'Y PACKING

IC203 994000002864 IC BU1924F /22/25 Q406 994000002834 TRANSISTORS MMBT3904LT1

IC204 994000002848 IC TC9422AFG Q602 994000002834 TRANSISTORS MMBT3904LT1

IC301 994000002841 IC KA7810 Q900 994000002862 TRANSISTORS 2W 8050C

IC302 994000000253 IC KA7808 R301 994000002854 FUSE RES. 2.2R 1W +-5%

IC303 994000000277 IC LM78L05 R462 994000002855 FUSE RES. 27R 1W +-5%

!

!

IC401 994000002852 IC TMP87PP23F (OTP) REM401 994000001239 OPTIC SENSER (OPTO..)

IC402 994000002845 IC TA7291S RF201 994000000256 TUNER (MITSUMI) FE450-G01

IC403 994000002853 IC XC61FC3012MR RL301 994000000264 RELAY 9V 10A /22/25

!

IC501 994000002851 IC TC94A34FG-006 SW401 994000000274 TACT SWITCH

IC502 994000002847 IC TC9404FN SW402 994000000274 TACT SWITCH

IC503 994000002839 IC H1117SJ-3.3V SW403 994000000274 TACT SWITCH

IC504 994000002838 IC BA15BC0FP SW404 994000000274 TACT SWITCH

IC601 994000000249 IC BA4558F SW405 994000000274 TACT SWITCH

IC602 994000000367 IC TFA9842J SW406 994000000274 TACT SWITCH

JK601 994000000257 PHONE JACK 7PIN SW407 994000000274 TACT SWITCH

JK602 994000000315 SPK JACK (R/B/R/B) SW408 994000000274 TACT SWITCH

LED401 994000001233 LED LAMP (RED) SW409 994000000274 TACT SWITCH

LED402

994000000267 LED LAMP 5mm (BLUE) SW410 994000000274 TACT SWITCH

LED403 994000000266 LED LAMP 3mm (BLUE) SW411 994000000274 TACT SWITCH

Q102 994000002839 IC H1117SJ-3.3V SW412 994000000274 TACT SWITCH

032 994000000307 SPEAKER WIRE HOLDER

Q201 994000002833 TRANSISTORS 9018G SW413 994000000274 TACT SWITCH

Q202 994000002834 TRANSISTORS MMBT3904LT1 SW414 994000000274 TACT SWITCH

Q203 994000002834 TRANSISTORS MMBT3904LT1 SW601 994000000273 MICRO SWITCH 1120B

Q206 994000002834 TRANSISTORS MMBT3904LT1 SW602 994000000273 MICRO SWITCH 1120B

Q207 994000002834 TRANSISTORS MMBT3904LT1 T201 994000002858 I.F.T 7mm #7M1A2186F (BLK)

9-3

ELECTRICAL PARTSLIST

T202 994000002859 I.F.T 7mm #7M4A1975R (ORANGE)

T203 994000002861 I.F.T 7mm A049 (YELLOW)

T302 994000000262 TRANSFORMER AC230V /22/25

VD201 994000002836 VARICAP DIODE 1SV-149

VD202 994000002836 VARICAP DIODE 1SV-149

!

994000002866 POWER BD ASS'Y /21/21M/37

994000002867 POWER BD ASS'Y /22/25

994000002868 KEY BD ASS'Y /21/21M/30/37

994000002869 KEY BD ASS'Y /22/25

9-3

Note: Only these parts mentioned in the list are

normal service parts.