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User Manual: MCM240

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Micro System

MCM240/15/21/21M/22/25/37

Service
Service
Service

Service Manual
COMPACT

TABLE OF CONTENTS

DIGITAL AUDIO

Page
Location of PCBs & 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
Revision List ................................................................ 10

CLASS 1
LASER PRODUCT

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 0636 Service Audio

Version 1.1

Printed in The Netherlands

Subject to modification

3141 785 30331

1-2

OP/CL BO ARD

LOCATION OF PRINTED CIRCUIT BOARDS

HEADPHONE BOARD
VOL BOARD

IN B

OA
R

SPEAKE

KEY

R BOAR

E
OW

A
BO

ANTENNA BOARD

VERSION VARIATIONS:
Type /Versions:

MCM240

Features &
Board in used:

/21

/21M

/22

/25

/37

/15

Aux in / CDR in
Line Out

Matrix Surround
RDS

News

Video Out
Surround Out
Subwoofer Out
Power Booster Out
Digital Out
Digital in

Dolby Pro Logic (DPL)
Incredible Surround
Karaoke Features
Voltage Selector

ECO6 Tuner Board - Systems Non-Cenelec
ECO6 Tuner Board - Systems Cenelec
USB PC LINK

ECO Power Standby (LCD Display Off)

1-3

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

Input sensitivity
Aux in (at 1kHz) : 500mV at 600 Ω

120V ± 10% for /37
230V ± 10% for /22/25

Output sensitivity
Headphone output at 32 kΩ

240V ± 10% for /30
Mains frequency
Clock accuracy

Dimension centre unit : 250 x 245 x 96 (mm)
Power consumption
Active

: 15mW ± 2dB (Max. vol.)

: 50/60Hz
: < 4 seconds per day
COMPACT DISC:
Frequency response within ± 3dB : 125Hz - 16kHz
Output level (in Vrms)
: 500mV, Zout = 100Ω
: 15W for /15/21/21M/22/25/37/30

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

Standby

: < 6W (DEMO mode off)

Distortion at 1kHz

: < 0.02%

ECO Power Standby

: < 1W for /22/25

Channel unbalance at 1kHz
Channel separation at 1kHz

: < ±3dB
: > 30dB

Emphasis

: 15/50 µS (switched

THD Noise(1kHz)

: < 1.0%

TUNER:

automatically by CD10)

FM
Tuning range

: 87.5-108MHz

Outband Attenuation

: > 35dB

Grid

: 50kHz
100kHz for /15/21/37

MP3-CD Bit Rate
WMA-CD Bit Rate
Sampling Rate

: 8-320 kbps
: 64-192 kbps
: 8, 11.025, 12, 16, 22.05,
24, 32, 44.1, 48, 96 kHz
: ISO9660, Joliet

IF frequency

: 10.7MHz ± 20kHz

Aerial input

: 75 Ω coaxial
300 Ω for /37
: < 22dBf

Sensitivity at 26dB S/N

Selectivity at 300kHz bandwidth

: > 33dB

Image rejection

: > 20dB [> 25dB]

Distortion at RF=1mV, dev. 75kHz

: < 3%

-3dB Limiting point
Crosstalk at RF=1mV, dev. 40kHz

: < 23.5dB
: > 26dB

MW
Tuning range

: 531-1602kHz

Grid

: 9kHz

530-1700kHz for /15/21/37
10kHz for /15/21/37
: 450kHz ± 1kHz
: Frame aerial 18.1µH

IF frequency
Aerial input
Sensitivity at 26dB S/N

: < 4.0mV/M

Selectivity at 300kHz bandwidth
IF rejection

: > 20dB
: > 24dB

Image rejection

: > 20dB [> 28 dB]

Distortion at RF=50mV, M=80%

: < 5%

[> 3.25mV/M]

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)

Format

: ON / OFF

[....]

Values indicated are for /22/25 only.

1-4

MEASUREMENT SETUP
Tuner FM
DUT
RF Generator

Bandpass
250Hz-15kHz

LF Voltmeter

e.g. 7122 707 48001

e.g. PM2534

Ri=50

e.g. PM5326

S/N and distortion meter
e.g. Sound Technology ST1700B

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

Tuner AM (MW,LW )
DUT

Bandpass
250Hz-15kHz

LF Voltmeter

e.g. 7122 707 48001

e.g. PM2534

RF Generator
e.g. PM5326

S/N and distortion meter

Ri=50

e.g. Sound Technology ST1700B

Frame aerial
e.g. 7122 707 89001

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

SBC429 4822 397 30184 (replaces test disc 3)

DUT
L
R

S/N and distortion meter
e.g. Sound Technology ST1700B

LEVEL METER
e.g. Sennheiser UPM550
with FF-filter

1-5

SERVICE AIDS
Service Tools:

ESD Equipment:

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

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

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

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

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

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

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

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

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

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

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

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

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

Earth cable (to connect product to mat or box) .... 4822 320 11308
Complete kit ESD3

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

(combining all above products) ......................... 4822 320 10671
Wristband tester .................................................... 4822 344 13999

1-6

ESD

WARNING

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.

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.

WAARSCHUWING

ATTENTION
I
D

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.

AVVERTIMENTO

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.

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.

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

CLASS 1
LASER PRODUCT

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

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.

Varning !

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

Varoitus !

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

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

Warning !

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

Sicherheitsbauteile sind durch das Symbol

Advarse !

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

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

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
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.
−
is reached and stabilized at the solder joint. Heating-time of the
Adjust your solder tool so that a temperature around
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.
Mix of lead-free solder alloy / parts with leaded solder alloy / parts is possible but PHILIPS recommends strongly to avoid mixed
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).
Use only original spare-parts listed in the Service-Manuals. Not listed standard-material (commodities) has to be purchased at
external companies.
Special information for BGA-ICs:
- 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.

•
•

•

For sets produced before 1.1.2005 (except products of 2004), containing leaded solder-alloy and components, all needed spare-parts
will be available till the end of the service-period. For repair of such sets nothing changes.

•

On our website www.atyourservice.ce.Philips.com you find more information to:
∗
∗

BGA-de-/soldering (+ baking instructions)
Heating-profiles of BGAs and other ICs used in Philips-sets

You will find this and more technical information within the "magazine", chapter "workshop news".
For additional questions please contact your local repair-helpdesk.

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.

Speaker
(left)

Position the antenna as far as possible from a TV,
VCR or other radiation source.

Connect the supplied MW loop antenna and FM
antenna to the respective terminals. Adjust the
position of the antenna for optimal reception.
MW Antenna

B Antennas Connection

FM wire antenna

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).

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.

A Power

The type plate is located at the rear of the
system.
For users in the U.K.: please follow the
instructions .

Rear connections

AC power cord

Speaker
(right)

MW loop antenna

Preparations

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).

Connecting other equipment to your
system

The optional equipment and connecting cords are
not supplied. Refer to the operating instructions
of the connected equipment for details.

Optional connection

Fully inser t the stripped por tion 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.

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 "-".

C Speakers Connection

For better FM stereo reception, connect an
outdoor FM antenna to the FM ANTENNA
terminal.

FM Antenna

1
2
3

1
2

CAUTION!
Batteries contain chemical substances, so
they should be disposed of properly.

Replace a new battery and fully inser t the
battery compartment back to the original
position.

Pull out the battery compartment B .

Pull out the knob A slightly to the left.

Replacing battery (lithium
CR2025) into the remote control

plastic
protective
sheet

Then select the desired function (for example
2 ; , ¡ , ™ ).

Select the source you wish to control by
pressing one of the source select keys on the
remote control (for example CD, TUNER).

Pull out the plastic protective sheet.

Before using the remote control

Preparations

1-8

PREPARATIONS AND CONTROLS

2
5

)

&
^
(

#
$

1
3
4

@
0
8
%
*

shows the status of the system.

activates/deactivates or selects the sleeper time.

–

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 ; ................... starts 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
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.

6 CD Door
7 Mode Selection

/ 4 ) (+/-)
adjusts the volume level.
adjusts the hours and minutes for the clock/timer
function.

5 VOLUME (3
–
–

interrupts and resumes sound reproduction.
repeats a track/disc programme/entire disc.
plays disc tracks in random order.

–

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 ).

connects headphones

–

( SHUFFLE

–

* REPEAT

–

& MUTE

for tuner, displays RDS information.

^ RDS

remote sensor
–

selects sound characteristics: ROCK/ JAZZ/
POP/ CLASSIC.

4 IR

–

% DSC (Digital Sound Control)

–

√/
opens/closes the CD door.

3 OPEN • CLOSE

–

2 Display screen

$ SLEEP

–

switches the system on or to Eco Power
standby/normal standby with clock display.

1 STANDBY-ON/ ECO POWER (B)

sets the clock function.
displays disc information during playback.
TIMER
activates/ deactivates or sets the timer function.

@ DISPLAY/CLOCK
–
–

–

Controls on the system and
remote control

Controls

1-9

PREPARATIONS AND CONTROLS

∂

1
2

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.

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.

Muiden kuin tässä esitettyjen
toimintojen säädön tai asetusten
muutto saattaa altistaa vaaralliselle
säteilylle tai muille vaarallisille
toiminnoille.

VAROITUS

Use of controls or adjustments or
performance of procedures other than
herein may result in hazardous
radiation exposure or other unsafe
operation.

CAUTION

For å redusere faren for brann eller elektrisk
støt, skal apparatet ikke utsettes for regn eller
fuktighet.

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).

Observer: Nettbryteren er sekundert
innkoplet. Den innebygde netdelen er
derfor ikke frakoplet nettet så lenge
apparatet er tilsluttet nettkontakten.

Typeskilt finnes på apparatens underside.

Norge

Philips Consumer Electronics
Philips, Glaslaan 2
5616 JB Eindhoven, The Netherlands

Fatto a Eindhoven

Si dichiara che l’apparecchio MCM240 Philips
risponde alle prescrizioni dell’art. 2 comma 1
del D.M. 28 Agosto 1995 n. 548.

DICHIARAZIONE DI CONFORMITA’

Italia

Note: The severed plug must be disposed of to
avoid a possible shock hazard should it be
inserted into a 13 Amp socket elsewhere.

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.

Refit the fuse cover.

Fix new fuse which should be a BS1362 3 Amp,
A.S.T.A. or BSI approved type.

Remove fuse cover and fuse.

Mains plug
This apparatus is fitted with an approved 13
Amp plug. To change a fuse in this type of plug
proceed as follows:

Important notes for users in the
U.K.

Set the clock correctly.
Press TIMER to switch on the timer.
The timer is not working.

Power has been interrupted or the power cord
has been disconnected. Reset the clock/timer.

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.

The left and right sound outputs are
reversed.
The remote control does not function
properly.

The Clock/Timer setting is erased.

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.

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.

Radio reception is poor.

The system does not react when buttons
are pressed.
Sound cannot be heard or is of poor
quality.

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.

Solution

“NO DISC” is displayed.

Problem

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.

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.

Troubleshooting

1-10

TROUBLESHOOTING

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 INSTRUCTIONS
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.

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

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.

Figure 4
Figure 5

Figure 1

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

Service position C

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 2
Figure 6

3-1

SERVICE TEST PROGRAM

To start service test program
hold VOL DN button
depressed then STOP
button depressed in
standby mode

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

4-1

SET BLOCK DIAGRAM

4-1

5-1

SET WIRING DIAGRAM

5-1

6-1

Printed Circuit Board - Side A

POWER 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 02866" for /21/21M/37.
"9940 000 02867" for /22/25.

Printed Circuit Board - Side A

6-2

CIRCUIT DIAGRAM

6-2

7-1

LAYOUT DIAGRAM - OPEN/CLOSE BOARD
TOP SIDE

KEY BOARD

LAYOUT DIAGRAM - OPEN/CLOSE BOARD
BOTTOM SIDE

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.

LAYOUT DIAGRAM - VOLUME BOARD
TOP SIDE

The board can be ordered with codenumber "9940 000 02868" for /21/21M/37.
"9940 000 02869" for /22/25.

LAYOUT DIAGRAM - VOLUME BOARD
BOTTOM SIDE

7-2

LAYOUT DIAGRAM - KEY BOARD
TOP SIDE

LAYOUT DIAGRAM - KEY BOARD
BOTTOM SIDE

7-2

7-3

CIRCUIT DIAGRAM

7-3

8-1

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

MAIN BOARD

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

PIN CONFIGURATION - 2-CHANNEL AUDIO
AMPLIFIER TFA9842J

VCC
9
IN1+

OUT1+

60 k Ω

IN2+

OUT2−

60 k Ω
CIV

3
V REF

SHORT-CIRCUIT
AND
TEMPERATURE
PROTECTION
V CC

MODE

STANDBY
MUTE
ON

TFA9842J

5
GND

6
0.5VCC

SVR

IN2+

OUT2−

CIV

IN1+

GND

SVR

MODE

OUT1+
VCC

8
9

TFA9842J

8-2

BLOCK DIAGRAM - CD Player Processor
TC94A14FA

BLOCK DIAGRAM - SYSTEM ELECTRONIC VOLUME
TC9422N

DV SS3 49

32 TEZI
Clock
generator

RO 50
DVDD3 51
DV

31 TEI

PWM

D/A
30 SBAD

LPF

29 FEI

1-bit
DAC

A/D

Servo control

LO 53

28 RFRP

DV SS3 54

27 RFZI

ZDET 55

ROM

Address
circuit

V SS5 56

RAM

BUS0 57

Synchronous
guarantee
EFM
decoder

BUS2 59
BUS3 60
BU C

Audio out
circuit

VDD3

24 RFI
23 SLCO
22

VCO

VSS3

21 VCOF
20 PVREF

Digital output

Microcontroller
interface

/CCE 62

Data
slicer

CLV servo

16 k
RAM

BUS1 58

26 RFCT

Digital equalizer
automatic
adjustment circui t

Sub code
decoder

19 LPFO

PLL
TMAX

/RST 63

18 LPFN

V DD5 64

17 TMAX
1

8-3

BLOCK DIAGRAM - MICROCONTROLLER UNIT
TMP87PP23F

8-3

8-4

LAYOUT DIAGRAM - MAIN BOARD
TOP SIDE

8-4

8-5

LAYOUT DIAGRAM - MAIN BOARD
BOTTOM SIDE

8-5

8-6

CIRCUIT DIAGRAM - MAIN BOARD
MCU PART

8-6

8-7

CIRCUIT DIAGRAM - MAIN BOARD
CD PART

8-7

8-8

CIRCUIT DIAGRAM - MAIN BOARD
MP3 PART

8-8

8-9

CIRCUIT DIAGRAM - MAIN BOARD
AMP PART

8-9

8-10

CIRCUIT DIAGRAM - MAIN BOARD
TUNER PART

8-10

8-11

LAYOUT DIAGRAM - HEADPHONE BOARD
TOP SIDE

8-11

LAYOUT DIAGRAM - HEADPHONE BOARD
BOTTOM SIDE

LAYOUT DIAGRAM - SPEAKER BOARD
TOP SIDE

LAYOUT DIAGRAM - SPEAKER BOARD
BOTTOM SIDE

LAYOUT DIAGRAM - MOTOR BOARD

LAYOUT DIAGRAM - SWITCH BOARD

LAYOUT DIAGRAM - LED BOARD
TOP SIDE

LAYOUT DIAGRAM - ANTENNA BOARD

LAYOUT DIAGRAM - LED BOARD
BOTTOM SIDE

9-1

SET EXPLODED VIEW
47

031

68
43

027
025

68
63
59

43
68

022

029

032

027
43

021

028

020
024
43

019

016

027

018

41
30

026

024
017

008

012
013

011

007

023

015
19

014
004

009

MCM240 SCREW LIST

006

002

005

003

68
63
61

HARDEN SCREW BTTB 3x8mm AB
SELF-TAPPING SCREW TA/WH 3x10mm(H D:10mm)
MACHINE SCREW MS/KH 3x8mm HD 5mm

9
4
2

NUT ID:3 OD:5.5 T:2.3mm

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

48
47
43
41
38
28

SELF-TAPPING SCREW TA/WH 3x12mm
HARDEN SCREW TT/PH 3x4
HARDEN SCREW BTTB 3x12 AB
MACHINE SCREW MS/BH 3x4 mm
SELF-TAPPING SCREW TB/KH 3x8 HD5mm
HARDEN SCREW BTTB 2.6x8mm MC

2
2
14
1
2
15

19
12

HARDEN SCREW BTTB 2x8 MC
SELF-TAPPING SCREW TA/KH 2.6x8mm

17
8

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

ITEM

001

DESCRIPTION

6
QTY

9-2

MECHANICAL & ACCESSORIES PARTS LIST
001

994000002809

CD DOOR LENS W/HOT FOIL

002

994000002805

CD DOOR COVER -LEFT

003

994000002806

CD DOOR COVER -RIGHT

004

994000002804

005

ELECTRICAL PARTSLIST
994000000275

RCA PIN JACK

C317

E.CAP 4700UF 16V +-20%

Q208

996500020152

TRANSISTORS MMBT3904LT1

! 994000000317

AC CORD CUL 6FT /37

C319

! 994000000512

AC CORD BS PLUG 2M /25

CF201

994000001346

E.CAP 4700UF 25V +-20%

Q209

996500020152

TRANSISTORS MMBT3904LT1

994000000245

BAND PASS FILTER

Q210

996500020152

TRANSISTORS MMBT3904LT1

CD DOOR CARRIER

! 994000002819

AC CORD 2.4M /21/21M/22

CF204

994000002857

CERAMIC FILTER SFU450B

Q211

996500020152

TRANSISTORS MMBT3904LT1

994000002811

CONTL PANEL LENS W/HOT FOIL

! 996500041861

AC CORD 1.8M /15

FS300 ! 994000000588

FUSE T800mA/250V /21/21M/37

Q212

996500020152

TRANSISTORS MMBT3904LT1

006

994000002803

FRONT CABINET /15/21/21M/30

994000002824

REMOTE CONTROL UNIT

FS301 ! 994000000585

CERAMIC FUSE 2A/250V

Q213

996500020152

TRANSISTORS MMBT3904LT1

006

994000002863

FRONT CABINET /22/25

994000002825

SPEAKER BOX L+R

FS302 ! 994000000586

GLASS FUSE 3.15A/250V

Q214

994000002835

TRANSISTORS MMBT3906LT1

006

994000002831

FRONT CABINET /37

FS303 ! 994000002865

SUBMINI. FUSE 200mA/250V /22 Q215

996500020152

TRANSISTORS MMBT3904LT1

007

994000000305

SENSOR LENS

IC1

932218179668

IC MM1469PH

Q301

994000001193

TRANSISTORS KSB772YS

008

994000000321

POWER /CD OPEN BUTTON

IC101

994000002844

IC TA2157FN

Q302

996500020152

TRANSISTORS MMBT3904LT1

009

994000000322

VOL +/- BUTTON

IC102

994000002849

IC TC94A14FAG

Q402

996500020152

TRANSISTORS MMBT3904LT1

011

994000002822

CD MECHANISM DA23Z1

IC103

994000002853

IC XC61FC3012MR

Q403

996500020152

TRANSISTORS MMBT3904LT1

012

994000002816

SHOCK ABSORBER (BLACK)

IC105

994000001197

IC KA7805

Q404

996500020152

MMBT3904LT1/21/21M/37

013

994000002817

SHOCK ABSORBER (GRAY)

IC201

996500018261

IC TC9257F

Q404

994000002835

MMBT3906LT1 /22/25

014

994000000324

FUNCTION BUTTON D./B./S./P./S.

IC202

996500018307

IC TA2099N

Q405

996500020152

TRANSISTORS MMBT3904LT1

015

994000000323

FUNCTION BUTTON STOP/PLAY

IC204

994000002848

IC TC9422AFG

Q406

996500020152

TRANSISTORS MMBT3904LT1

016

994000002837

LCD DISPLAY

IC301

994000002841

IC KA7810

Q602

996500020152

TRANSISTORS MMBT3904LT1

017

994000002814

DRIVE BELT

IC301

996500038611

IC KA7810E /15

Q900

482213063664

TRANSISTORS 2W 8050C

018

994000002808

DRIVER PULLEY GEAR

019

994000002807

DRIVING GEAR

020

994000002832

021

Note:

994000002856

Only these parts mentioned in the list are

IC302

994000000253

IC KA7808

R301

! 994000002854

FUSE RES. 2.2R 1W +-5%

normal service parts.

IC303

994000000277

IC LM78L05

R462

! 994000002855

FUSE RES. 27R 1W +-5%

MOTOR BRACKET

IC401

994000002852

IC TMP87PP23F (OTP)

REM401 994000001239

OPTIC SENSER (OPTO..)

994000002818

DOOR MOTOR PULLY

IC402

482220930619

IC TA7291S

RF201

994000000256

TUNER (MITSUMI) FE450-G01

022

994000002815

DC MOTOR 5V

IC403

994000002853

IC XC61FC3012MR

RF201

994000004442

TUNER FE450-G11 /15

023

! 994000000597

TRANSFORMER 120/230V /15/21/21M

IC501

994000002851

IC TC94A34FG-006

RL301 ! 994000000264

RELAY 9V 10A /22/25

023

! 994000000278

TRANSFORMER 230V /22/25

IC502

994000002847

IC TC9404FN

SW401

994000000274

TACT SWITCH

023

! 994000000316

TRANSFORMER EI-57 120V /37

IC503

994000002839

IC H1117SJ-3.3V

SW402

994000000274

TACT SWITCH

024

994000000284

RUBBER FOOT

IC504

994000002838

IC BA15BC0FP

SW403

994000000274

TACT SWITCH

025

994000000281

RCA JACK BD 2P (RD/WH)

IC601

994000000249

IC BA4558F

SW404

994000000274

TACT SWITCH

026

994000000592

REAR CABINET /15/21/21M

IC602

994000000367

IC TFA9842J

SW405

994000000274

TACT SWITCH

026

994000000291

REAR CABINET /22/25

JK601

994000000257

PHONE JACK 7PIN

SW406

994000000274

TACT SWITCH

026

994000000319

REAR CABINET /37

JK602

994000000315

SPK JACK (R/B/R/B)

SW407

994000000274

TACT SWITCH

027

994000000283

SPEAKER HOLDER

LED401 994000001233

LED LAMP (RED)

SW408

994000000274

TACT SWITCH

028

994000002813

RUBBER FOOT 24x11x1.6mm

LED402 994000000267

LED LAMP 5mm (BLUE)

SW409

994000000274

TACT SWITCH

029

994000002812

UNIT STAND

LED403 994000000266

LED LAMP 3mm (BLUE)

SW410

994000000274

TACT SWITCH

031

994000002823

AM/FM ANT 75R ASS'Y PACKING

Q102

994000002839

IC H1117SJ-3.3V

SW411

994000000274

TACT SWITCH

032

994000000307

SPEAKER WIRE HOLDER

Q201

994000002833

TRANSISTORS 9018G

SW412

994000000274

TACT SWITCH

Q202

996500020152

TRANSISTORS MMBT3904LT1

SW413

994000000274

TACT SWITCH

Q203

996500020152

TRANSISTORS MMBT3904LT1

SW414

994000000274

TACT SWITCH

Q206

996500020152

TRANSISTORS MMBT3904LT1

SW601

994000000273

MICRO SWITCH 1120B

9-3

ELECTRICAL PARTS LIST
T201

994000002858

I.F.T 7mm #7M1A2186F (BLK)

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

X101

9940 000 04551

X'TAL 16,9344MHZ +/-20PPM

X201

9940 000 04535

X'TAL 7,2MHZ +/-30PPM

X402

9965 000 38613

X'TAL 7.99968MHZ

X501

9940 000 04551

X'TAL 16,9344MHZ +/-20PPM

994000002866

POWER BOARD ASS'Y /15/21/21M/37

994000002867

POWER BOARD ASS'Y /22/25

994000002868

KEY BOARD ASS'Y /15/21/21M/30/37

994000002869

KEY BOARD ASS'Y /22/25

Note:

Only these parts mentioned in the list are
normal service parts.

9-3

10-1

REVISION LIST

1.0 Manual 3141 785 30330
Initial Service Manual released.

1.1 Manual 3141 785 30331
In this version, the type version /15 are added.
P9-2 : Mechanical Partslist updated
P9-3 : Electrical Partslist updated

Source Exif Data:

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File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.5
Linearized                      : Yes
Page Count                      : 34
Page Mode                       : UseThumbs
Has XFA                         : No
XMP Toolkit                     : XMP toolkit 2.9.1-13, framework 1.6
About                           : uuid:4c5300dc-a7d0-41be-9e25-00df3a6544fa
Producer                        : Acrobat Distiller 5.0.2 for Macintosh
Create Date                     : 2005:07:19 09:07:16Z
Modify Date                     : 2006:09:11 11:51:12+08:00
Metadata Date                   : 2006:09:11 11:51:12+08:00
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Document ID                     : uuid:2bfb6073-6d88-460f-a6cf-ea3efc8c1c0e
Format                          : application/pdf
Creator                         : linda y xu
Title                           : Page 1-1 to 3 A4 pages
Author                          : linda y xu

EXIF Metadata provided by EXIF.tools

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