Philips FWM15/21/22 Schematic

GB

CLASS 1

LASER PRODUCT

COMPACT

DIGITAL AUDIO

Service Manual

Service

Service

Service

Service

Service

FWM15/21/22

TABLE OF CONTENTS

Page

Location of PCBs & Version variations ......................1-2

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

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

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

Preparations & Controls .............................................2-1

Disassembly Instructions & Service positions ...........3-1

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

Main Board.....................................................................6

ECO Power Board .........................................................7

Tape Mechanism............................................................ 9

3CDC-LC-MP3CD2002 ...............................................10

Set Mechanical Exploded view & parts list ................. 11

Electrical parts list ...................................................... 12

©

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 LX 0503 Service Audio Printed in The Netherlands Subject to modification

MP3 3CDC Mini System

3141 785 30130

Version 1.0

1 - 2

LOCATION OF PRINTED CIRCUIT BOARDS

MP3

B

O

ARD

3C

B

MAIN

BO

A

RD

ECO POWER BO

VERSION VARIATION S:

Type /Versions: FWM15

Features &
Board

in used:

/21 /22

Incredible Surround
Karaoke
News
RDS
Rotary Encoder (volume control)
Jog Shuttle
Voltage Selector x
Aux Input
Digital Outp ut
Headphone So ck et x x
Line Output
Subwoofer Output
Surround Output
Matrix Surround Loudspeakers
Standby - Cloc k Disp la y x x
Standby - Dar k
ECO Power Standby (Clock Display Off)
ECO6 Tuner Board - System Cenelec
ECO6 Tuner Board - System Non-Cenelec

x

DC

O

RD

A

MAIN B

ONE PCB

x
x

ARD

OA

Only for /22 versions

RD

1 - 3

GENERAL:

Mains voltag e :

230V ± 10% for /22

Mains frequency : 50/60Hz /21

Power consumption :

≤ 15W at Standby /21

≤ 0.5W at ECO Standby /22

30W Active /22

Clock accura cy : < 4 second s pe r da y
Dimension ce nt re unit : 265 x 310 x 330mm

TUNER:
FM

Tuning range : 87.5-108MHz
Grid : 50kHz
IF frequency : 10.7MHz ± 20kHz
Aerial input : 75!& coaxial
Sensitivit y at 26d B S/ N : < 22∝V
Selectivit y at 300 kH z ba ndwi dt h : > 25dB
Image rejection,98MHz : > 40dB /21

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

-3dB Limitin g po in t : < 23.5∝V
Crosstalk at RF= 1m V, dev. 40 kH z : > 18dB

MW

Tuning range : 530-1700kHz /21

Grid : 10kHz /21

IF frequency : 450kHz ± 1kHz
Aerial input : Frame aerial, 18.1 ∝H
Sensitivit y at 26d B S/ N : < 4.4mV/ M
Selectivity at 300kHz bandwidth : > 18dB
IF rejection : > 45dB
Image reject io n : > 28dB
Distortion at RF =5 0mV, m=80% : < 5%

AMPLIFIER:

Output power

1)

:2 x 10W RMS
Frequency response wit hin -3 dB : 50Hz-1 5k Hz
Dynamic Bass Boost : DBB1, DBB2, DBB3, DBB Off

2)

Digital Soun d Co ntro l : Jazz, Tec hn o, Opt im al , Ro ck

2)

Headphone ou tp ut at 32W ::900mV ± 1dB (max Vol.)

CASSETTE RECORDER:

Number of trac k : 2 x 2 stereo
Tape speed : 4.76 cm/sec +2.5/-1.5

%
Wow and flutter : < 0.40% DIN
Fast-wind/rewind time C60 : 130 sec
Bias system : 75kHz ± 5kHz
Rec/Pb frequency response within 8dB : 80Hz - 10kHz
Signal to nois e rati o (A-weighted) :

≥ 48dBA

COMPACT DISC:

Measurement done at output conn. of the CDC module.
Frequency response withi n ± 1.5dB: 20Hz - 20kHz
Output level (in Vrms) : 550mV, Z

out

= 100Ω
Signal/Noise ratio (A-weighted) : > 75dBA
Distortion at 1kHz : < 0.003%
Channel unba lanc e at 1kH z : ±1dB
Channel sepa ra ti on at 1k Hz : > 60dB
De-emphasis : 0 or 15/50 mS (Switched by subcode

on the disc)

1)

4Ω, 1 kHz, 10% THD

2)

Frequency response in each setting is software controlled.

Weight (w/o speakers) : 4.6Kg

Frequency response : 80 - 12500Hz (8dB)

110-127V/220-240V Switchable for /21

25W Active /21

50Hz /22

≤ 11W at Standby /22

> 80dB /22/25

:531-1602kHz /22

:9kHz /22

Impedance headphones 32Ω--1000Ω

SPECIFICATIONS

MEASUREMENT SETUP

Tuner FM

1-4

Bandpass

LF Voltmeter

e.g. PM2534

RF Generator

e.g. PM5326

DUT

250Hz-15kHz

e.g. 7122 707 48001

Ri=50Ω

S/N and distortion meter

e.g. Sound Technology ST1700B

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

Tuner AM (MW,LW)

RF Generator

e.g. PM5326

Ri=50Ω

DUT

Frame aerial

e.g. 7122 707 89001

Bandpass

250Hz-15kHz

e.g. 7122 707 48001

LF Voltmeter

e.g. PM2534

S/N and distortion meter

e.g. Sound Technology ST1700B

To avoid atmospheric interference all AM-measurements have to be carried out in a Faraday´s cage.
Use a bandpass filter (or at least a high pass filter with 250Hz) to eliminate hum (50Hz, 100Hz).

CD

Use Audio Signal Disc
(replaces test disc 3)

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-filter

Recorder

Use Universal Test Cassette CrO2 SBC419 4822 397 30069

or Universal Test Cassette Fe SBC420 4822 397 30071

LF Generator

e.g. PM5110

DUT

L

R

S/N and distortion meter

e.g. Sound Technology ST1700B

LEVEL METER

e.g. Sennheiser UPM550

with FF-filter

SERVICE AIDS

1-5

Service Tools:

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

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

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

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

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

WARNING

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.

F

ATTENTION

Tous les IC et beaucoup d’autres
semi-conducteurs sont sensibles aux
décharges statiques (ESD).
Leur longévité pourrait être considérablement
écourtée par le fait qu’aucune précaution n’est
prise à leur manipulation.
Lors de réparations, s’assurer de bien être relié
au même potentiel que la masse de l’appareil et
enfiler le bracelet serti d’une résistance de
sécurité.
Veiller à ce que les composants ainsi que les
outils que l’on utilise soient également à ce
potentiel.

1-6

ESD

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.

WAARSCHUWING

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.

I

AVVERTIMENTO

Tutti IC e parecchi semi-conduttori sono
sensibili alle scariche statiche (ESD).
La loro longevità potrebbe essere fortemente
ridatta in caso di non osservazione della più
grande cauzione alla loro manipolazione.
Durante le riparazioni occorre quindi essere
collegato allo stesso potenziale che quello della
massa dell’apparecchio tramite un braccialetto
a resistenza.
Assicurarsi che i componenti e anche gli utensili
con quali si lavora siano anche a questo
potenziale.

GB

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

NL

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

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.

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.

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

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.

Warning !

S

Varning !

3122 110 03420

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.

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

Varoitus !

SF

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

DK Advarse !

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

2 - 1

Preparations

Rear connections

The type plate is located at the rear of the

system.

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

instructions on page 2.

A Powe r

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.

B Antennas Connection

Connect the supplied AM 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.

Preparations

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 "R" and left speaker to

"L", coloured (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 impedance lower

than the speakers supplied. Please refer to the

SPECIFICATIONS section of this manual.

Inserting batteries into the

remote control

Insert two batteries type R03 or AAA (not

supplied) into the remote control with the

correct polarity as indicated by the "+" and

"-" symbols inside the battery compar tment.

CAUTION!

–Remove batteries if they are exhausted

or will not be used for a long time.

– Do not use old and new or different

types of batteries in combination.

– Batteries contain chemical substances, so

they should be disposed off properly.

2

1

PREPARATIONS AND CONTROLS

Fix the claw

to the slot

2 - 2

4

(

^

5

9

2

£

#

)°%

8

&

21365

7

0

!

9

8

4

$

%

&*^

@

#

CD1

CD2

CD3

™

PREP ARATIONS AND CONTROLS

Controls

Controls on the system and

remote control

1 STANDBY ON y

–to switch the system on or to standby mode.

2 TUNER (BAND)

–to select waveband : FM or MW.

TAPE (TAPE 1•2)

–to select tape mode.

3 ECO POWER

–to switch the system on or to Eco Power

standby mode.

4 CD 1/ CD 2/ CD 3 (CD 1/2/3)

–to select disc tray 1, 2 or 3.

5 DSC (DIGITAL SOUND CONTROL)

–to select the desired sound effect :

JAZZ, ROCK, TECHNO or OPTIMAL.

6 CD OPEN/CLOSE

–to open or close the disc tray.

7 DISC CHANGE

– to change disc(s).

8 DBB (DYNAMIC BASS BOOST)

–to select the desired bass boost level.

9 PROGRAM

for CD ................. to programme disc tracks.

for Tuner ............. to programme preset radio

stations.

for Clock ............ to select 12- or 24-hour clock

mode.

0 Ta pe deck 1 operation

â .......................... to star t recording.

É .......................... to star t playback.

à / á ............... to rewind or fast forward.

70 ........................ to stop playback/recording or to

open the tape door.

Å .......................... to interr upt playback or

recording.

! Ta pe deck 2 operation

É .......................... to star t playback.

à / á ............... to rewind or fast forward.

70 ........................ to stop playback or to open the

tape door.

Å .......................... to interr upt playback.

@ CLOCK•TIMER

–to view the clock, set the clock or set the timer.

# DIM

–to select different brightness for the display

screen : DIM 1, DIM 2, DIM 3 or DIM OFF.

$ n

–to connect headphones.

% MASTER VOLUME (VOL +/-)

–to increase or decrease the volume.

^ Mode Selection

PLAY•PAUSE ÉÅ

for CD/MP3-CD…to start or interrupt playback.

for Plug & Play…(on the system only) to initiate

and start plug & play mode.

SEARCH•TUNING à (ALBUM)

SEARCH•TUNING á (ALBUM)

for MP3-CD ..... to select previous/next album.

for CD ................. to search backward/forward.

for Tuner ............. to tune to a lower or higher

radio frequency.

for Clock ............ (on the system only) to set the

hour.

STOP•CLEAR / DEMO STOP 9

for CD/MP3-CD…to stop playback or to clear a

programme.

for Tuner ............. (on the system only) to stop

programming or to erase a

selected preset.

for Demo ........... (on the system only) to activate/

deactivate the demonstration.

for Clock ............ (on the system only) to exit clock

setting or cancel timer.

for Plug & Play…(on the system only) to exit plug

& play mode.

PREPARATIONS AND CONTROLS

2 - 3

PREV í / PRESET 4 (TITLE)

NEXT ë / PRESET3 (TITLE)

for MP3-CD .....to select previous/next title.

for CD ................. to skip to the beginning of the,

previous, or next track.

for Tuner ............. to select a preset radio station.

for Clock ............ (on the system only) to set the

minute.

& Display screen

– to view the current status of the system.

* Disc tray

( REPEAT

– to playback track(s)/disc(s)/programme

repeatedly.

) SHUFFLE

– to playback all available tracks/programme of the

current disc in random order.

° MUTE

– to interrupt or resume sound reproduction.

SLEEP

– to activate/deactivate or set the sleep timer.

£ B

– to switch the system to standby mode.

– to switch the system to Eco Power standby

mode.

Notes for remote control:

– First, select the source you wish to

control by pressing one of the source select

keys on the remote control (CD 1/2/3 or

TUNER, for example).

– Then select the desired function (

É

,

í

,

ë

, for example).

Controls

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 5 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 5 Amp. If a plug without a fuse

is used, the fuse at the distribution board

should not be greater than 5 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 ear th

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 FWM15 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 Nether lands

CAUTION

Use of controls or adjustments or

performance of procedures other than

herein may result in hazardous

radiation exposure or other unsafe

operation.

PREPARATIONS AND CONTROLS

2 - 4

Radio reception is poor.

Recording or playback cannot be made.

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.

Not all lighted buttons are showing light.

The Clock/Timer setting is erased.

The system displays features

automatically.

If the signal is too weak, adjust the antenna or

connect an external antenna for better

reception.

Increase the distance between the Mini HiFi

System and your TV or VCR.

Clean deck parts, see “Maintenance”.

Use only NORMAL (IEC I) tape.

Apply a piece of adhesive tape over the missing

tab space.

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.

Check the speaker connections and location.

Select the source (CD 1/2/3 or TUNER, for

example) before pressing the function button

(…,Ì,Î).

Reduce the distance between the remote

control and the system.

Insert the batteries with their polarities

(+/- signs) aligned as indicated.

Replace the batteries.

Point the remote control directly towards the IR

sensor.

Set the clock correctly.

Press and hold CLOCK•TIMER to switch on the

timer.

If recording or tape dubbing is in progress, stop

recording.

Press DIM to select DIM OFF display mode.

Power has been interr upted or the power cord

has been disconnected. Reset the clock/timer.

Press and hold «on the system to switch off

the demonstration.

Problem

Solution

Maintenance

Cleaning the Cabinet

Use a soft cloth slightly moistened with a mild

detergent solution. Do not use a solution

containing alcohol, spirits, ammonia or abrasives.

Cleaning Discs

When a disc becomes dirty,

clean it with a cleaning cloth.

Wipe the disc from the centre

out. Do not wipe in circular

motion.

Do not use solvents such as

benzene, thinner, commercially

available cleaners, or antistatic spray intended for

analogue records.

Cleaning the disc lens

After prolonged use, dirt or dust may

accumulate at the disc lens. To ensure good

playback quality, clean the disc lens with Philips

CD Lens Cleaner or any commercially available

cleaner. Follow the instructions supplied with

cleaner.

Cleaning the Heads and the Tape Paths

To ensure good recording and playback quality,

clean the heads

A and B, the capstan(s) C,

and pressure roller(s)

D after every 50 hours

of tape operation.

Use a cotton swab slightly moistened with

cleaning fluid or alcohol.

You also can clean the heads by playing a

cleaning tape once.

Demagnetising the heads

Use a demagnetising tape available at your

dealer.

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.

“DISC NOT FINALIZED” is displayed.

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 CD-R.

Problem

Solution

Tr oubleshooting

MAINTENCE AND TROUBLESHOOTING

DISMANTLING INSTRUCTIONS

Dismantling of the Lens Cassette

1) Uncatch 4 catches along the edge of the Cassette door
(pos 5) as shown in figure 1 and 2 to remove the Lens
cassette (pos 2).

3-1 3-1

Figure 2: Left Cassette door

Figure 1

Dismantling the 3CDC Module

1) Loosen the 4 screws, slide Cover top (pos 30) towards the
rear and remove it upwards.

2) Loosen 3 screws slide the Panel right (pos 26) towards the
rear and remove it outwards. Do likewise for the Panel left
(pos 27).

3) Push the gear slowly towards the front as shown in figure

Figure 4

Dismantling of the Panel Rear

3 until the CDC tray starts to move out of the Front Cabinet
(pos 8). The CDC tray is now disengage and can be pulled
out completely.

1) Loosen 6 screws C on the Panel rear (pos 24).

2) Press the 2 catches C1 inwards and dismantle the Panel
rear by pulling it towards the rear.

4) Remove the Cover Tray (pos 29) as shown in figure 4.

5) Loosen 4 screws A to remove the CDC Module (pos 28) as
shown in figure 3.

A

A

A

C1

2

Pull Rear
Panel out

Turn the Gear towards the Front
till the CDC Tray starts to open

1
Press Inwards

Figure 3

Figure 5

3-2

Dismantling of the Front Panel and Bottom Panel assembly

1) Remove 8 screws D mounting the Front board.

2) Remove 1 screw E supporting the bracket, Combi board
(pos 33) to the Panel front (pos 8).

3) Remove 1 screw F (see figure 5) mounting the Mains
transformer body to the Panel Bottom (pos 25).

Note: Care must be taken not to damage the board

because of the heavy Mains transformer.

3-2

Service pos A

4) The Front and Combi boards together with the Mains
transformer can now be remove.

5) Loosen 6 screws G and eject both cassette doors to
remove the Tape mechanism (pos 12).

Note: During re-assembly of the Tape mechanism

and Front board care must be taken to ensure
the wires are properly dressed and not touch­ing any moving parts on the Tape mechanism.

Figure 6

Figure 8

Figure 7

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

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

Service pos B

4 - 14 - 1

SET BLOCK DIAGRAM

6 - 16 - 1

MAIN BOARDS

TABLE OF CONTENTS

FTD Display pin connection .......................................... 6-1

Tape Adjustment & Mesurement ................................... 6-2

Tuner Adjustment T able ................................................. 6-2

Layout Diagram(casse,amplifier,mains part-/21)........... 6-3

Layout Diagram(casse,amplifier,mains part-/22)........... 6-5

Main Circuit.................................................................... 6-7

Tape Part Circuit

.............................................................

6-8

Front Part Ci rcuit ........................................................... 6-9

Layout Diagram(front part)..................... ....................... 6-10

Circuit Diagram(tuner part -/21).................................... 6-12

Circuit Diagram(tuner part -/22).................................... 6-15

TDA7468 & TMP87CN71 Internal Block diagram ....... 6-18

Electrical parts list........................................................ 6-19

FTD DISPLAY PIN CONNECTIONS

FTD DISPLAY PIN NO.

FUNCTION

3
4

2

G

3
5

1

G

3
6

-

3
7

-

3
8

-

3
9

F
2

3
3

3

G

3
1

5

G

3
0

6

G

2
9

7

G

2
8

8

G

3
2

4

G

2
6

10

G

2
5

11

G

2
4

12

G

2
3

-

2
7

9

G

2
2

-

2
1

-

2
0

P
1

1
9

P
2

1
8

P
3

1
7

P
4

1
6

P
5

1
4

P
7

1
3

P
8

1
2

P
9

1
1

P

10

1
5

P
6

1
0

P

11

9

P

12

8

P

13

7

P

14

6

P

15

5

P

16

4

-

3

-

2

-

1

F
1

4G

a
h

j , p

k
b

f

m

g
c
e

r
n
d

-

-

-

10G

-

6G

a
h

j , p

k
b

f

m

g
c
e

r
n
d

-

-

-

12G

B1
B2
B3
B4
B5

-

-

-

-

5G

a
h

j , p

k
b

f

m

g
c
e

r
n
d

-

-

-

3G

a
h

j , p

k
b

f

m

g
c
e

r
n
d

-

-

-

1G7G
a
h

j , p

k
b

f

m

g
c
e

r
n
d

Col

Dp

-

8G

a
h

j , p

k
b

f

m

g
c
e

r
n
d

-

-

-

9G

a
h

j , p

k
b

f

m

g
c
e

r
n
d

-

-

-

11G

B1
B2
B3
B4
B5
B6
B7
B8

B9
B10
B11
B12
B13

-

P1
P2
P3
P4
P5
P6
P7
P8

P9
P10
P11
P12
P13
P14
P15
P16

2G

a
h

j , p

k
b

f

m

g
c
e

r
n
d

-

-

-







B5

B4

B1

B2

B3

B10
B9
B8
B7
B6

B5
B4
B3
B2
B1

B10
B9
B8
B7
B6

B13
B12
B11

B5
B4
B3
B2

B1

Col 1

(11G)

(12G)

a

k

h

f

b

j

Dp

n

g

m

p

e

c

r

d

(2G - 9G)

1G

2G

10G

11G

8G

9G

3G

4G

5G

6G

7G

12G 11G

VARICAP ALIGNMENT

FM RF

FM IF

VCO

AM IF

AM RF

3)

108MHz

87.5MHz

(65.81MHz)

87.5MHz

(65.81MHz)

87.5MHz

(65.81MHz)

279kHz
153kHz

1602kHz

531kHz

5130

check

5122

check

5123

check

8V ±0.2V

4.3V ±0.5V

(1.2V ±0.5V)

8V ±0.2V

1.1V ±0.4V
8V ±0.2V

1.1V ±0.4V

1494kHz

558kHz

560kHz 5102

1500kHz

5103198kHz

1494kHz

558kHz

560kHz

1500kHz

198kHz

2106
5102

2106

3142 152kHz ±1kHz

1)

98MHz

5112

MAX

FM

87.5 - 108MHz

(65.81 - 74, 87.5 - 108MHz)

LW

153 - 279kHz

MW

FM/MW/LW- version, 9kHz grid

531 - 1602kHz

1700kHz

530kHz

5123

check

8V ±0.2V

1.1V ±0.4V

1602kHz

531kHz

5123

check

6.9V ±0.2V

1.1V ±0.4V

108MHz

108MHz 2155

5131

MW

FM/AM-version, 10kHz grid

530 - 1700kHz

FM

MW

LW

98MHz, 1mV

continuous wave

450kHz

connect pin 6 of

IC 7101 (AM Osc.)

with 3.3kΩ to Vcc

Use Service Testprogram. By selecting the TUNER TEST test frequencies will be stored as preset frequencies automatically.

4

1

3

5

5

A

A

5119FM

10.7MHz, 45mV

continuous wave

2D

mod=1kHz

∆f=±22.5kHz

1)

If sensitivity of frequency counter is too low adjust to max. channel separation

(input signal: stereo left 90% + 9%, adjust output on right channel to minimum)

Repeat

ECO6, Sys + PA with frame aerial, 070799

TUNER ADJUSTMENT TABLE

( ECO6 FM/MW- and FM/MW/LW - versions with AM-frame aerial )

∆f=±10kHz

VRF = 0.5mV

C

see
remark

2)

220R

100nF

36

IC 7101

220R

100nF

40

IC 7101

2141

shortcircuit
to block AFC

21

IC 7101

max.

symmetric

f

o

AM AFC

MW

C

continuous wave

VRF = 2mV

5111

5114

2

0 ± 2 mV DC

0 ± 3 mV DC

MW

4)

FM/MW/LW- and FM/MW-version
( 9kHz grid)

531 - 1602kHz

B

∆f = ±30kHz
V

RF

as low as

possible

max.

symmetric

f

o

MW

FM/AM-version, 10kHz grid

530 - 1700kHz

3)

For AM RF adjustments the original frame antenna has to be used !

2)

RC network serves for damping the IF-filter while adjusting the other one.

4)

MW has to be aligned before LW.

Waverange Input frequency Input Tuned to Adjust Output Scope/Voltmeter

FM

87.5 - 108MHz

(65.81 - 74, 87.5 - 108MHz)

FM/MW-version, 9kHz grid

531 - 1602kHz

(as low as

possible)

TAPE ADJUSTMENTS & MEASUREMENTS

6-26-2

General

ADJUST

MOTOR SPEED

CASSETTE

SBC420

(4822 397 30071)

3150Hz

TEST

RECORDER
MODE

PLAY

deck A or B

CHECK

WOW & FLUTTER

ADJUST

AZIMUTH

Playback

SBC420

(4822 397 30071)

3150Hz

SBC420

(4822 397 30071)

10kHz

PLAY

deck A or B

PLAY deck A

PLAY deck B

MEASURE
ON

or

11 12

LEFT RIGHT

or

headphone socket

or

11 12

LEFT RIGHT

or

headphone socket

11 12

LEFT RIGHT

or

headphone socket

READ ON

frequency
counter

W&F-meter check only

mV-meter

or

oscilloscope

left hand screw

ADJUST

with to

3758

CHECK

PLAYBACK
FREQUENCY RESPONSE

(4822 397 30071)

SBC420

PLAY deck A

PLAY deck B

11 12

LEFT RIGHT

or

mV-meter Check limits see fig.1

3150Hz ±1%

≤0.4 % DIN or

≤0.35 % CCIR

max. output level

& left=right

Recording

PRE-ADJUST

BIAS

CHECK

OVERALL
FREQUENCY RESPONSE

Input signal: 3mV
100Hz, 250Hz, 1kHz,
10kHz

13

via or

CHECK

14

DISTORTION

Input signal: 300mV

1kHz

13

via or

14

Remark: If high frequencies are not within lower limit, decrease bias and re-measure.

If distortion is too high increase bias and re-measure.

level(dB)

FERRO

FERRO

RECORDED

CASSETTE

FERRO

RECORDED
CASSETTE

RECORD

RECORD

PLAY

RECORD

PLAY

11 12

LEFT RIGHT

11 12

LEFT RIGHT

8dB

250

80

6dB

4k

10k

figure. 1

8dB

f(Hz)

15

or

mV-meter

mV-meter check only limits see fig.2

5701

or

level(dB)

THD-meter check only ≤5%

8dB

(10dB HSD)

6dB

100

250

4k

figure. 2

8dB

(10dB HSD)

10k

14V

rms

(40Vpp)

adj. ECO MTF DD AS, 110399

f(Hz)

6 - 3 6 - 3

Tuner part (ECO6)

LAYOUT DIAGRAM - MAIN BOARD(only for -/21)
(CASSETTE,MAINS,AMPLIFIER PART)