Philips FWM-143 Schematic

Service AIDS & CD playability ......................................1

Specifications ................................................................2

Connection & Controls ...................................................3

Disassembly Instructions ...............................................4

Block & Wiring diagrams ................................................5

RADIO BOARD ..............................................................6

AMP & POWER BOARD ...............................................7

MCU BOARD ..................................................................8

CASS BOARD ................................................................9

CD BOARD ...................................................................10

EXPLODE DIAGRAM ....................................................11

SERVICE PARTLIST .....................................................12

VERSION LIST ..............................................................13

3141 785 31993

SERVICE AIDS

1-1

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

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.

WARNING

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

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

ESD

CLASS 1

LASER PRODUCT

Lead free

CD PLAYABILITY CHECK

Customer complaint

"CD related problem"

check playability

1-2

Set remains closed!

playability

ok ?

Play a CD

for at least 10 minutes

check playability

playability

ok ?

"fast" lens cleaning

check playability

playability

ok ?

For flap loaders (= access to CD drive possible) cleaning method

4 is recommended

Standard repair procedure

clean the lens

check playability

playability

ok ?

check "EYE-Pattern"

return set

add Info for customer

"SET OK"

return set

1 - 7

For description - see following pages

replace Signal Processor

return set

EYE-Pattern

ok ?

check Laser current

Laser current

ok ?

check CD Drive offsets

CD Drive offsets

ok ?

replace CD Drive

return set

replace CD Drive

return set

replace CD Drive

return set

CD PLAYABILITY CHECK

1-3

PLAYABILITY CHECK

For sets which are compatible with CD-RW discs

use CD-RW Printed Audio Disc ....................7104 099 96611

TR 3 (Fingerprint) TR 8 (600µ Black dot) maximum at 01:00

• playback of these two tracks without audible disturbance playing time for: Fingerprint t10seconds

Black dot from 00:50 to 01:10

• jump forward/backward (search) within a reasonable time

For all other sets

use CD-DA SBC 444A..................................4822 397 30245

TR 14 (600µ Black dot) maximum at 01:15 TR 19 (Fingerprint) TR 10 (1000µ wedge)

• playback of all these tracks without audible disturbance playing time for: 1000µ wedge t10seconds

Fingerprint t10seconds Black dot from 01:05 to 01:25

• jump forward/backward (search) within a reasonable time

LIQUID LENS CLEANING

Before touching the lens it is advised to clean the surface of the lens by blowing clean air over it. This to avoid that little particles make scratches on the lens.

Because the material of the lens is synthetic and coated with a special anti-reflectivity layer, cleaning must be done with a non-aggressive cleaning fluid. It is advised to use “Cleaning Solvent B4-No2”, available with codenumber 4822 389 10026.

The actuator is a very precise mechanical component and may not be damaged in order to guarantee its full function. Clean the lens gently (don’t press too hard) with a soft and clean cotton bud moistened with the special lens cleaner.

The direction of cleaning must be in the way as indicated in the picture below.

CUSTOMER INFORMATION

It is proposed to add an addendum sheet to the set which informs the customer that the set has been checked carefully - but no fault was found. The problem was obviously caused by a scratched, dirty or copy-protected CD. In case problems remain, the customer is requested to contact the workshop directly. The lens cleaning (method 3) should be mentioned in the addendum sheet.

The final wording in national language as well as the printing is under responsibility of the Regional Service Organizations.

FAST LENS CLEANING (dry brush)

Use lens cleaning CD

SBC AC300 ...........................................9082 100 00043

Insert the lens cleaning CD, press PLAY and follow the voice guide´s instructions on the CD.

CD PLAYABILITY CHECK

1-4

EYE-PATTERN SIGNAL – JITTER MEASUREMENT

Measure the signal on the input of the Signal processor using an analog oscilloscope. Please find the exact measuring point in your Service Manual.

EYE-PATTERN

800mVpp

TB = 0.5Ps/div

HF-Amplifier

+5V_HF

3920

100R

1K5

3902

220u

2885

2,4V

7876

2883

3903

3908

3904

3K3

470n

2884

470R

3906

0,65V

2K2

7877

BC847B

6 (A-D)

2881

560p

3901

560R

BC847B

1,8V

2882

470n

1,2V

82p

3907

820R

See below examples of the signal. Amplitude should read at least 700mVpp using SBC444A.

VrefCD10

3905

2,6V

680R

2813

4n7

+3.3V

7878 BC847B

3898

220R

3893

470R

3896

100R

47n

2818

4u7

2817

3n3

2814

3897

HFIN

28152816

LDON to 3826,3827

3899

CD_DA: 0V / CD_RW: 3V

2K7

+3.3V

3895

2887

VREF GE

VRIN

IREF

27K

VDDA1

47n

VSSA1

ISLICE

33K

HFIN

100p

HFREF

22n

3909

3923

10K Sanyo DA12T3

CD DRIVE – LASER CURRENT MEASUREMENT

The laser current can be measured as a voltage drop on a resistor. The resistor is marked in every Service Manual. The value depends on the type of CD drive.

typical value most probably defect

VAMxxxx : 150-230mV t350mV MCDxx : 170-230mV t300mV DA1x : 210-250mV t350mV DA2x : 175-200mV t250mV Use SBC444A (CD-DA) for measurement.

Laser power control

U >250mV

->Laser damaged !

+5V_HF

LASER DIODE

3817

47R

3820

470n

2877

3821

4R7

47u

3822

2878

100n

2876

47R

3819

3818

3,9V

3,3V

7879 BC807-40

47n

2869

10K

3823

+5V

2841

100n

4,6V

7811-A

LM358D

0,17V

2880

0,17V

2879

33p

good

bad

If the oscilloscope shows a signal like the ‘bad’ one, and/or the amplitude decreases within 1 minute - the CD drive has to be replaced.

CD DRIVE – OFFSET MEASUREMENT

The photodiodes of the CD-drive may have an offset. These offsets have to be compensated by the signal processor. High offsets can lead to poor playability of some CDs (skipping tracks).

To measure the offset values, start the Service Test Program - section “Focus Test” without a CD.

The offsets can be measured with a DC Millivoltmeter directly on the connector (see drawing below). Pin numbering varies from drive to drive.

The values from diode A-D should read 0±10mV. Diodes E and F are less critical.

CD Drive

Sanyo DA12T3

1800

VREF

VCC

GND

If one of the offsets is higher than ±10mV the CD drive has to be replaced. Otherwise replace the Signal Processor.

VrefCD10

+5V_HF

2 - 1

AMPLIFIER

Output power ....................................... 2 x 20 W RMS

.......................................................................... 800W PMPO

Signal-to-noise ratio .......................... * 62 dBA (IEC)

Frequency response ......... 63 – 16000 Hz, ± 3 dB

Impedance loudspeakers ......................................... 8 1

Impedance headphones ................. 32 1 – 1000 1

CD PLAYER

Frequency range .................................. 63 – 16000 Hz

Signal-to-noise ratio ............................................ 65 dBA

TUNER

FM wave range ...................................87.5 – 108 MHz

MW wave range ............................... 522 – 1710 KHz

TAPE DECK

Frequency response

Normal tape (type I) ...... 125 – 8000 Hz (8 dB)

Signal-to-noise ratio

Normal tape (type I) .................................... 35 dBA

Wow and flutter ......................................... ) 0.4% DIN

SPEAKERS

Bass reflex system Dimensions (w x h x d) . 190 x 292 x 182 (mm)

GENERAL INFORMATION

AC Power ............................ 110 – 127 / 220 – 240 V

....................................................... 50/60 Hz Switchable

Dimensions (w x h x d) .. 220 x 292 x 285 (mm)

Weight (with/without speakers) ..................................

............................................................... approx. 4.9 / 2.3 kg

Specifications and external appearance are subject to change without notice.

CONNECTION AND CONTROLS

3 - 1

Inserting batteries into the

Optional connection

remote control with the correct polarity as

remote control

Insert two batteries type R03 or AAA into the

indicated by the “+”and“-” symbols inside

the battery compar tment.

are not supplied. Refer to the operating

The optional equipment and connecting cords

Connecting external equipment

instructions of the connected equipment for

details.

speaker

Use a cinch cable to connect AUX IN to the

analogue audio out terminals of an external

(left)

equipment (TV, VCR, Laser Disc player, DVD

player or CD Recorder).

AUX IN

L R

CAUTION!

– Remove batteries if they are exhausted

L R

AUX

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 of properly.

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).

speaker

(right)

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 "-".

B Speakers Connection

Rear connections

The type plate is located at the back of the

system.

wall outlet, ensure that all other connections

have been made.

Selector, set the VOLTAGE SELECTOR to the

– If your system is equipped with a Voltage

local power line voltage.

– Before connecting the AC power cord to the

A Pow er

wire into the terminal as shown.

● Fully insert the stripped portion of the speaker

WARNING!

– For optimal performance, use only the

original power cable.

– Never make or change any connections

Notes:

– For optimal sound performance, use the

supplied speakers.

with the power switched on.

To avoid overheating of the system, a safety

speaker terminals.

– Do not connect speakers with an impedance

lower than the speakers supplied. Please refer to

– Do not connect more than one speaker to any

one pair of

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

the SPECIFICATIONS section of this manual.

before reusing it (not available for all versions).

CONNECTION AND CONTROLS

3 - 2

Controls

fast rewinds/forwards the tape

...................................... stops the tape; opens the tape

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

RECORD 0 ....... starts recording.

^ n

& Tape Deck Operation

– connect headphones.

Controls on the system and

remote control

LCD Display

– shows the status of the system.

STOP•OPEN 9/

PLAY 2 ................. starts playback.

REW à /F.FWD á

for CD ................. programs tracks and reviews the

– infrared sensor for remote control.

2 iR SENSOR

3 PROGRAM (PROG)

compartment.

PAUSEÅ ............pauses recording or playback.

program.

current track/previous/next track

(title).

back and forward within a track/

CD.

for CD/MP3 ..... repeats a track/CD programme/

* REPEAT

– switches the system to standby/on.

4 STANDBY-ON y (POWER y)

for CD/MP3 ..... plays CD tracks in random order.

( SHUFFLE

) SLEEP

entire CD.

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

for CD/MP3 ..... starts or pauses CD playback.

5 2;

6 TITILE-/+ ¡1 / 2™

¡ MUTE

– activates/deactivates or selects the sleeper time.

current track/previous/ next

track (title).

(press and hold) fast searches

POP/ROCK.

™ TIMER ON/OFF

– switches playback sound off and on.

back and forward within a track/

£ DSC (Digital Sound Control)

– activates/deactivates the timer.

– selects sound characteristics: CLASSIC/JAZZ/

for clock / timer functions.

disc.

for clock/timer .. adjusts the hours and minutes

7 Source selector (CD/ TAPE/TUNER/AUX)

TAPE/ TUNER/AUX.

– selects the respective sound source for CD/

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

for CD/MP3 ..... (press and hold) fast searches

for clock/timer adjusts the hours and minutes

for clock/timer functions.

≤ í/ë

for Tuner ............. selects waveband: MW or FM.

for AUX ..............selects the AUX mode.

– sets the clock or timer function.

8 CLOCK/TIMER

9 Mode selector (MW/FM/AUX)

– open/close the CD door.

0 OPEN/CLOSE

! STOP 9

for MP3 ............... selects an album.

∞ ALBUM-/+ 5 /6

CD program.

for CD/MP3 ..... stops CD playback or erases a

for MP3 ............... selects an album upward.

§ ALBUM+

– tunes to a radio station.

@ TUNING

# DISPLAY

– display the current time.

– enhances the bass.

$ DBB (Dynamic Bass Boost)

– adjusts the volume level.

% VOLUME 3/4

2&(™)¡%

38$!£

0@5

6!§87

Controls

412

DISASSEMBLY DIADRAMS

4 - 1

A. Remove CD Door

a.Power on the unit and open the CD door.

b.Remove the CD door cover.

B. Remove Top Cabinet B1: Remove screws MP 3x12 - 6 pcs. B2: Remove screws MP 3x12 - 4 pcs. B3: Remove screws MP 3x12 - 4 pcs.

C. Remove CD Loader C1: Remove screws SP 3x8 - 2 pcs. C2: Remove screws SP 3x15 - 2 pcs. C3: Remove screws SP 3x10 - 1 pcs.

+ 20 hidden pages