Philips AJ-3950 Service manual

CD Clock Radio

AJ3950

all versions

TABLE OF CONTENTS

chapter

Handling chip components and safety 1 - 1 Technical Specification & Service Tools 2 - 1 Service Measurement 2 - 2 Connections & Controls Instructions for use Disassembly Diagram 4 - 1 CD Service Test Program 4 - 2 to 4 - 3

Block Diagram Wiring Diagram 6 - 1

MAIN BOARD (Part 1)

circuit diagram layout diagram

MAIN BOARD (Part 2)

circuit diagram layout diagram

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3 - 1

3 - 2 to 3 - 4

5 - 1

7 - 1 7 - 2

8 - 1 8 - 2

TUNER BOARD

circuit diagram layout diagram

CD MODULE

layout diagram circuit diagram

EXPLODED VIEWS DIAGRAM

cabinet

Mechanical partslist Electrical partslist

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chapter

9 - 1 9 - 2

10 - 1 10 - 2

11 - 1 11 - 1

12 - 1 to 12 - 5

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

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.

Printed in The Netherlands Copyright reserved Subject to modification

PCS 107 248

CLASS 1

LASER PRODUCT

3140 785 22570Published by SS 0109 Service Audio

HANDLING CHIP COMPONENTS

1-1

All ICs and many other semiconductors 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 wristband with resistance. Keep components and tools at this potential.

f ATTENTION

Tous les IC et beaucoup d ´autres semi-conducteurs sont sensibles aux d écharges statiques (ESD). Leur long évite pourrait être consid érablement écourt ée par le fait qu ´aucune précaution n ést prise à leur manipulation. Lors de r éparations, s ´assurer de bien être reli é au m ême potentiel que la masse de l ´appareil et enfileer le bracelet serti d ´une r ésistance de s écurit é. Veiller à ce que les composants ainsi que les outils que l ´on utilise soient également à ce potentiel.

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

Les normes de s écurit é exigent que l`appareil soit remis à l`état d`origine et que soient utilis ées les pi èces de rechange identiques à celles sp écifiées. Les composants de s écurit é sont marqu és

d WARNUNG

Alle ICs und viele andere Halbleiter sind empfindlich gegen über elektrostatischen Entladungen (ESD). Unsorgf ältige Behandlung im Reparaturfall kann die Lebensdauer drastisch reduzieren. Sorgen Sie daf ür, daß Sie im Reparaturfall über ein Pulsarmband mit Widerstand mit dem Massepotential des Gerätes verbunden sind. Halten Sie Bauteile und Hilfsmittel ebenfalls auf diesem Potential.

Bei jeder Reparatur sind die geltenden Sicherheitsvorschriften zu beachten. Der Originalzustand des Ger ätes darf nicht ver ändert werden. F ür Reparaturen sind Originalersatzteile zu verwenden. Sicherheitsbauteile sind durch das Symbol markiert.

ESD

SAFETY

ñ WAARSCHUWING

Alle IC ´s en vele andere halfgeleiders zijn gevoelig voor electrostatische ontladingen (ESD). Onzorgvuldig behandelen tijdens reparatie kan de levensduur drastisch doen vermindern. Zorg ervoor dat u tijdens reparat ie 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 scar iche statiche (ESD). La loro longevit à potrebbe essere fortemente ridatta in caso di non osservazione della pi ù grande cauzione alla loro manipolazione. Durante le riparationi occorre quindi essere collegato allo stesso potenziale che quello della massa delápparecchio tramite un braccialetto a resistenza. Assicurarsi che i componenti e anche gli utensili con quali si lavora siano anche a questo potenziale.

Veiligheidsbepalingen vereisen, dat het apparaat in zijn oorspronkeliijke toestand wordt teruggebracht en dat onderdelen, identiek aan de gespecificeerde, worden toegepas t. De Veiligheidsonderdelen zijn aangeduid met het symbool

Le norme di sicurezza estigono che l ´apparecchio venga rimesso nelle condizioni originali e che siano utilizzati i pezzi di ricambiago identici a quelli specificati. Componenty di sicurezza sono marcati con

DANGER : Invisible laser radiation when open. AVOID DIRECT EXPOSURE TO BEAM.

s Varning !

Osynlig laserstr ålning n är apparaten är öppnad och spärren är urkopplad. Betrakta ej str ålen.

∂ Advarsel !

Usynlig laserstr åling ved åbning n år sikkerhedsafbrydere er ude af funktion. Undg å udsaettelse for str åling.

PCS 104 437

CLASS 1

LASER PRODUCT

ß Varoitus !

Avatussa laitteessa ja suojalukituksen ohitettaessa olet alt tiina näkymättömälle laseris äteilylle. Älä katso s äteeseen !

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

"Pour votre s écurite, ces documents doivent être utilis és par des sp écialistes agr éés, seuls habilit és à réparer votre appareil en panne".

TECHNICAL SPECIFICATIONS

2-1

GENERAL

Mains voltage -/00 : 220 - 230 V

-/17 : 120v

Mains frequency -/00 : 50 Hz

-/17 : 60 Hz Battery mains : 4.5 V Power consumption max. : 17 W

standby : 3.4 W Dimension (W x H x D) : 170 x 190 x 190 mm Weight : 2.1 Kg

AMPLIFIER

Output power mains : 2 x 0.8 W Speaker impedance : 2 x 8 ohm Frequency response : 100 Hz - 10 kHz (±4dB)

TUNER - FM SECTION

Tuning range : 87.5 - 108 MHz IF frequency : 10.7 MHz ± 0.3 MHz Sensitivity : 3 µV at 26dB S/N Selectivity : 24 dB at 300kHz IF rejection : 55 dB Image rejection : 26 dB

TUNER - AM SECTION

Tuning range MW : 526.5 – 1606.5 kHz

-/17 : 520 - 1722 kHz IF frequency : 468 kHz ± 3 kHz Sensitivity MW : 69 dBµV/m at 26dB S/N Selectivity M W : 20 dB IF rejection MW : 28 dB Image rejection MW : 32 dB

COMPACT DISC

Frequency response : 125 Hz - 10 kHz S/N ratio : 60 dB Channel difference 1 kHz : 2 dB Channel crosstalk 1 kHz : 40 dB Laser wavelength : 780 ± 20 nm Laser light power : < 0.5 mW

SERVICE TOOLS

Audio signal disc SBC 429.......................................................................4822 397 30184

Playability test disc SBC 444 Test disc 5 (disc without errors ) + Test disc 5A (disc with dropout errors, black spots and fingerprints)

SBC 426/426A.....................................................................4822 397 30096

Burn in test disc (65 min. 1kHz signal at -30 dB level without “pause”)

Universal test cassette Fe SBC 420........................................................4822 397 30071

...................................................................4822 397 30245

.....4822 397 30155

PCS 107 249

CONNECTIONS AND CONTROLS

3-1

24 hours.

- sets the day for weekend sleeper activation.

- stops the active buzzer, radio or CD alarms for

- opens/ closes CD door.

- tunes to a radio station.

%SET DAY

^24 HR RESET

CONTROLS

•CD PLAYER

1STOP 9

&LIFT TO OPEN

*TUNING

- stops CD playback;

- stops sleep function in CD mode;

- stops the active CD alarm for 24 hours.

2PLAY/ PAUSE 2;

- aerial to improve FM reception.

(Pigtail

)Mains lead

- starts/ pauses CD playback.

passage.

- skips CD tracks/ searches for a particular

3SEARCH ∞, §

- for AC mains supply.

INSTALLATION

The type plate is located on the bottom of the

set.

CAUTION

Use of controls or adjustments or performance of

procedures other than herein may result in hazardous

radiation exposure or other unsafe operation.

BRIGHTNESS CONTROL

illumination;

- changes the brightness of the display

- switches off the alarm for a 9 minute period;

- activates and adjusts the sleep time.

•GENERAL

4SLEEP

5REPEAT ALARM/

- stops sleep function in CD, buzzer or radio mode.

6WEEKEND-SLEEPER

MODE/OFF

T SE

Mains Supply and Demo mode

set.

- deactivates alarm 1 and/ or 2 for the weekend.

- shows the clock/ alarm time and status of the

7Display

E M

U L O

plate on the bottom of the set, corresponds to your

local mains supply. If it does not, consult your

1 Check if the power voltage, shown on the type

dealer or service centre.

2 Connect the mains plug into the wall socket. The

- sets/ reviews/ switches off alarm 1 or 2.

8ALARM 1 MODE/ OFF or ALARM 2 MODE/ OFF

- switches the radio on/ off;

•RADIO

9ON/ OFF

#$@

continuously.

mains supply is now switched on and the display

will show the PHILIPS demo mode.

™ PH..IL..IPSscrolls across the display

• Press any control (with the exception of

- stops sleep function in radio mode;

- stops the active radio alarm for 24 hours.

- selects the radio waveband.

0FM/ AM (MW)

to exit the demo mode.

supply, withdraw the mains plug from the wall

REPEAT ALARM/ BRIGHTNESS CONTROL on the set)

•SETTING TIMES

!ALARM 1, ALARM 2, TIME

socket.

3 To disconnect the set completely from the mains

- sets the respective alarm or clock time

Standby power consumption (clock mode)......3 W

volume level for alarm 1 or 2;

- adjusts clock/ alarm times;

- adjusts the gentle wake minimum and maximum

- selects a CD wake up track for alarm 1 or 2.

@7, 8

- adjusts the sound level.

#VOLUME $, 3

$Frequency indicator

waveband

- shows the radio frequency of your selected

3 2 1

()*&&

RADIO

•

OFF

CONT

A T

BRIGHTNESS

USE

A P

/ Y

I D

K RA C O

CL C IS

D T

MP O C

95 J3 A

PLA

H C R A E S

SLEEPER

WEEKEND-

P EE

L S

IOIIOIOO

547

MODE/OFF

ALARM 1

I D A R

P E E L S

PCS 107 250

INSTRUCTIONS FOR USE

SETTING THE ALARM OPTIONS

General

Two different alarm times, ALARM 1or 2 can be set

in the CD, radio or buzzer modes. This can be useful

time functions correctly!

when for example you need to be woken up at a

different time during the week and at the weekend.

- Remember to first set the DAY, clock and alarm

- Make sure your selected alarm symbol is shown.

Viewing the Alarm Mode Options

1 Select your choice of alarm mode by pressing

gentle wake alarm

CD mode with CD and a track number

(buzzer) k AL, or

(radio) m tu, or

– Followed by the 3 different alarms:

ALARM 1 or ALARM 2 MODE/ OFF once or more

to find your respective mode.

– H1:16 – default maximum volume level for

™ The alarm mode display sequence is shown:

– Lo:00 – default volume level for start of

3-2

1-99.

respective modes.

2 Read the following chapters to adjust or select the

Adjusting the Gentle Wake Volume

A sure way of getting up in the mornings, the gentle

wake volume for the alarm begins from gentle

volume e.g Lo:00 (low) and gradually increases to a

higher volume e.g. H1:11.

The default volume range is Lo:00 and H1:16. If

or ALARM 2 MODE/ OFF once.

you wish to change the default volume for the buzzer,

radio or CD alarm:

1 In the standby mode, press ALARM 1 MODE/ OFF

more to adjust the starting volume of your alarm.

ALARM 1 MODE/ OFF or ALARM 2 MODE/ OFF

again to change to the H1:16 display.

2 As soon as Lo:00appears, press 7or 8once or

3 To set the maximum volume for your alarm, press

reach the desired volume level (10-32).

4 As soon as H1:16appears, press 7or 8until you

Notes:

• The H1 volume is always greater or equal to the

track(s).

previous tracks.

Selecting a different track during playback

the beginning of the current track.

The track number appears briefly in the display when

you press SEARCH ∞ or § to skip tracks.

• Press SEARCH § once or more to skip to the next

• Press SEARCH ∞ more than once to skip to

• Press SEARCH ∞ once and playback will return to

SETTING THE DAY

Setting the day enables you to set the WEEKEND-

SLEEPER function. If you attempt to use the

WEEKEND-SLEEPER prior to setting the day

(Monday to Sunday, 1-7) will show briefly in

the display to remind you to set the day first.

1 Press SET DAY.

2 While the day display is shown, pressSET DAY

SEARCH ∞ or §.

™ The CD is played at high speed and low volume;

Finding a passage within a track

1 During playback, press and hold down

again once or more to select the day numbered

from dAY 1-7 (Monday-Sunday):

™ The display will revert to show the clock time.

CD PLAYBACK

RADIO

the display will show Cd: and your current

track number.

LIFT TO OPEN.

1 To open the CD door, lift at the edge marked

resumes.

the passage you want.

™ Normal CD playback and standby clock time

2 Release SEARCH ∞ or § when you recognize

close the door.

2 Insert a CD with the printed side facing up, and

RADIO

number of tracks are shown, followed by the

™ The CD indicator , Cd:-- and the total

3 Press PLAY/ PAUSE 2;to start playback.

time , and the last selected

™ tuis displayed briefly followed by the clock

1 Press ON/ OFF to switch on the radio.

first track number before returning to clock time.

door/ open the CD door during playback.

– door is shown if you have not closed the CD

waveband.

inserted incorrectly.

– noCd is shown if no CD has been inserted/

station.

3 Adjust the sound using VOLUME $or 3.

4 Adjust the TUNING wheel to tune to a radio

To improve reception:

FM: Extend pigtail at the back of the set fully for

optimum reception.

2 Press FM/ AM if you wish to change waveband.

the set.

– nFCd is shown if the CD-R(W) is non-finalized

– Err indicates a general error in operation of

™ The display returns to clock time.

4 Adjust the sound with VOLUME $or 3.

AM (MW): uses a built-in aerial. Direct the antenna

returning to clock time. flashes during

5 To interrupt, press PLAY/ PAUSE 2;.

• The current track number shows briefly before

RADIO

the display.

™ and the waveband disappear from

by adjusting the position of your set.

5 Press ON/ OFF to switch off the radio.

playback.

pause.

™ The display returns to clock time.

7 Press STOP 9to stop playback.

6 Press PLAY/ PAUSE 2; again to resume

MEMORY BACKUP

The memory backup conveniently allows your day,

PCS 107 251

will show the PHILIPS demo mode and you will

alarm and clock time settings to be stored for up to 3

need to re-enter the day, alarm and clock times.

minutes when there is a mains interruption e.g.

AC mains failure.

The complete CD clock radio and illumination will be

switched off. As soon as the mains supply returns, the

display will indicate the correct time.

• If mains supply returns after 3 minutes, the display

BASIC FEATURES

or more.

Illumination brightness

™ The brightness of the display will change in this

• Press REPEAT ALARM/ BRIGHTNES CONTROL once

sequence:

LOW ? MEDIUM ? BRIGHT ? LOW...

Volume

Press VOLUME $ or 3to adjust the volume level.

SETTING THE CLOCK AND ALARM TIMES

0-32.

The volume level UO: is indicated as a number from

the respective clock or alarm time display flashes.

and minutes.

decreases rapidly and continuously from minutes to

hours. Release 7or 8when you have reached the

correct setting.

minute, press 7or 8briefly and repeatedly.

The time is displayed using the 24 hour clock.

1 PressTIME, ALARM 1 or ALARM 2 briefly until

2 Press and hold down 7, 8to adjust both the hours

• By pressing 7or 8respectively, the time increases/

• If you need to adjust the time slowly, minute by

3 Press TIME, ALARM 1 orALARM 2 to confirm

your respective time setting.

INSTRUCTIONS FOR USE

long time, withdraw the power plug from the wall

outlet.

sand or excessive heat caused by heating

equipment or direct sunlight.

chamois leather. Do not use any cleaning agents

containing alcohol, ammonia, benzene or abrasives

MAINTENANCE

General (See figure 6)

• If you do not intend to use the CD clock radio for a

• Do not expose the set or CDs to humidity, rain,

as these may harm the housing.

• To clean the set, use a soft, slightly dampened

3-3

can cause condensation to form and the lens of

your CD player to cloud over. Playing a CD is then

not possible. Do not attempt to clean the lens but

leave the set in a warm environment until the

moisture evaporates.

compartment dust-free. To clean, dust the

compartment with a soft dry cloth.

spindle while lifting the CD. Always pick up the CD

CD player and CD handling

• The lens of the CD player should never be touched!

• Sudden changes in the surrounding temperature

• Always shut the CD door to keep the CD

by the edge and replace the CD in its box after use

• To take a CD out of its box, press the centre

to avoid scratching and dust.

centre towards the edge using a soft, lint-free

cloth. Do not use cleaning agents as they may

• To clean the CD, wipe in a straight line from the

damage the disc.

• Never write on a CD or attach any stickers to it.

Environmental information

All unnecessary packaging material has been omitted

to make the packaging easy to separate into three

materials: cardboard (box), expandable polystyrene

(buffer), polyethylene (bags, protective foam).

SLEEP

Your set consists of materials which can be recycled if

disassembled by a specialized company. Please

observe local regulations on the disposal of packing

materials and old equipment.

disappears from the display.

appears for one or both alarms.

step 1 until Z

WEEKEND-SLEEPER

This feature deactivates the alarm every Saturday and

Sunday and resumes the alarm function Monday to

Friday. Make sure, however, that you have set the day

first.

• See chapter on SETTING THE DAY.

1 Press WEEKEND-SLEEPER once or more until Z

– inserted a CD incorrectly;

– inserted a damaged CD;

– forgotten to insert any CD;

– not closed the CD door properly.

SWITCHING OFF THE ALARM

There are three ways of switching off the alarm.

Unless you cancel the alarm completely, the

See figure 4.

2 To cancel the weekend-sleeper function repeat

24 HOUR ALARM RESET will be automatically

SLEEP

24 HOUR ALARM RESET

selected after 59 minutes, from the time your alarm

time first goes off.

If you want the alarm mode to be stopped

switch on the respective mode.

About Sleep

The CD clock radio has a built-in sleep timer which

enables the set to be automatically switched off

during radio or CD playback after a set period of time.

There are four sleep times before the set turns itself

off:

10, 30, 60, 90 minutes and off.

The sleep function does not affect the operation of

your alarm settings.

Setting Sleep

1 Press PLAY/ PAUSE2; (CD) or ON/ OFF (radio) to

CD alarms

selected alarm:

immediately but also wish to retain the same alarm

a 24 HR RESET to switch off the buzzer, radio or

setting for the following day:

• Press from 3 possible options according to your

reset activation.

b STOP 9 CD alarm only

c ON/ OFF radio alarm only.

™ You will hear a beep tone confirming 24 hour

disc first.

• For the CD mode, make sure you have inserted a

CANCELING THE ALARM COMPLETELY

To cancel the set alarm time before it goes off, or

during the alarm call:

• Press ALARM 1 MODE/ OFF or ALARM 2 MODE/

more until the desired sleep time is shown.

2 Select your sleep time by pressing SLEEP once or

OFF once or more until the selected alarm indicator

disappears from the display.

disappears from the display

See figure 5

3 To cancel the sleep function you can either:

– press SLEEP once or more untily

will also hear a beep tone confirming the alarm

™ If you cancel the alarm during the alarm call, you

– press STOP 9 (CD only)

– press REPEAT ALARM/ BRIGHTNESS CONTROL

– press ON/ OFF (radio only).

has been cancelled.

press REPEAT ALARM/ BRIGHTNESS CONTROL.

REPEAT ALARM

This will repeat your alarm call at 9-minute intervals.

• During the alarm call,

• Repeat if desired up to an hour.

Notes:

• The selected alarm mode k, m , or indicators will

flash throughout the repeat alarm duration.

resumes at the point interrupted by the repeat alarm.

to an hour unless you cancel/ reset the alarm.

• If you are using the CD alarm mode, CD playback

• During the CD alarm, CD playback continues for up

e.g.ii. Lo:12, H1:12

Lo volume: e.g.i. Lo:15, H1:19

• The starting volume is Lo:00, with a possible

low volume range 00-32, and the maximum

volume is H1:32, with a possible high volume

range10-32.

normal CD and radio playback volume level.

• The gentle wake volume settings do not affect

cancels the alarm completely.

range during the active alarm call as pressing

ALARM 1 MODE/ OFF or ALARM 2 MODE/ OFF

• It is not possible to review the gentle wake volume

• During the alarm call, if you press 7or 8the high

volume stops increasing immediately.

OFF repeatedly until the (buzzer) k AL or

(radio) m tu display is shown.

Selecting Buzzer or Radio Alarm

• Press ALARM 1 MODE/ OFF or ALARM 2 MODE/

Note:

If you have selected the radio alarm m tu, make sure

you have tuned properly to a station.

ALARM 2 MODE/ OFF repeatedly until the CD and

track number display is shown.

CD Alarm Mode: Selecting a CD track

You can program and select a CD track number

between 1-99, when the set is in the standby or radio

playback mode.

However, if the track number programmed does not

exist on your CD, the CD will start playback from the

first track during the alarm call.

1 Insert a CD into the CD compartment.

See figure 3.

2 Press ALARM 1 MODE/ OFF or

3 As soon as the CD alarm display appears,

press 7or 8until the desired track number is

shown.

™ The display returns to standby clock time.

again repeatedly until the CD alarm display is

shown.

ALARM 1 MODE/ OFF or ALARM 2 MODE/ OFF

4 To review your programmed track number, press

the CD alarm if you have:

Note:

• The buzzer alarm option will automatically replace

PCS 107 252

INSTRUCTIONS FOR USE

3-4

TROUBLESHOOTING

If a fault occurs, first check the points listed below before taking the set for repair.

PCS 107 253

•RADIO

Occasional crackling sound during

FM broadcast

Weak signal

- Extend pigtail fully

Continuous crackling/

hiss disturbance during AM (MW) broadcast

Electrical interference from TVs, computers,

fluorescent lamps, etc.

- Move set away from other electrical equipment

•ALARM

The alarm does not function

Problem

Possible Cause

- Remedy

No sound

Volume not adjusted

- Adjust the volume

If you are unable to remedy a problem by following these hints, consult your dealer or service centre

WARNING:

Do not open the set as there is a risk of electric shock!

Under no circumstances should you try to repair the set yourself, as this will invalidate the guarantee.

No reaction to any operation of the buttons

reconnect the set after 5 minutes

Electrostatic discharge

- Disconnect the set from the power supply and

•CD PLAYER

TIMES

Alarm time not set

- See chapter on SETTING THE CLOCK AND ALARM

Alarm mode not selected

- See chapter on SETTING THE ALARM OPTIONS

CD playback does not work

CD badly scratched or dirty

- Replace/ clean CD

Laser lens steamed up

- Wait until lens has acclimatized

Volume too low for radio/ CD/ buzzer alarm mode.

- See chapter on Adjusting the Gentle wake volume

•WEEKEND-SLEEPER

WEEKEND-SLEEPER does not function

Day selection not set/ incorrect

- See chapter on SETTING THE DAY

WEEKEND-SLEEPER not set

- Set WEEKEND-SLEEPER

This product complies with the radio interference

requirements of the European Union.

Laser lens dirty

- Clean lens by playing a CD lens cleaning disc

CD-R(W) is non-finalized

- Use a finalized CD-R(W)

DISASSEMBLY DIAGRAM

A. To remove Rear Cabinet B. To remove Speaker Frame C. To remove CD Tray and Middle Bracket D. To remove Middle Bracket E. To remove Main Board F. To remove Repeat Alarm Key

4-1 4-1

PCS 107 254

+ 18 hidden pages