Philips AZ-7901 Service Manual
PRODUCT FAMILY DORIS1 – PB1
Technical specification ......................................................1-1
Feature overview...............................................................1-1
Connections and controls..................................................1-2
Accessories .......................................................................1-3
Safety & Warnings.............................................................1-4
Service hints
Repair positions ............................................................2-1
Dismantling CD-door.....................................................2-1
CD-drive cleaning & lubrication.....................................2-2
CD-drive lens cleaning..................................................2-2
Handling chip components............................................2-3
Service tools..................................................................2-3
Pin description of ICs ................................................3-1...3-3
Start-up procedure.............................................................3-4
Blockdiagram.....................................................................3-5
Circuit diagrams
Part1 (supply, control and servo part)...........................4-1
Part2 (signal processing and audio part) ......................4-2
Printed circuit board
Componentside view.....................................................4-3
Copperside view............................................................4-4
Exploded view ...................................................................5-1
Mechanical partslist...........................................................5-1
Electrical partslist ......................................................6-1...6-2
CS 46 638
© 3103 785 25000
Published by PW 9951 Service Audio Printed in The Netherlands Subject to modification
Portable compact disc player
CLASS 1
LASER PRODUCT
AZ7900
AZ7901
all versions
TABLE OF CONTENTS
©
Copyright 1999 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.
1-1
CS 46 639
TECHNICAL SPECIFICATION
General
Dimensions (WxHxD) : 128x28x139mm
Weight without batteries : 220g
Power supply modes
DC-in socket : 2.5-6.0V
Primary batteries (2xLR6) : 1.6-3.6V
Rechargable batteries (AY3362) : 1.6-3.6V
Battery lifetime
Primary batteries (2xLR6) : ≥11h (15h typ.)
Rechargable batteries (AY3362) : ≥6h (8h typ.)
Battery empty detection
Battery empty level : 1.8V nom. +100/-50mV
Current consumption at DC-in supply = 4.5V
PLAY mode : ≤150mA (100mA typ.)
JUMP mode : ≤300mA (220mA typ.)
Stand-by mode : ≤200µA (100µA typ.)
Current consumption at Battery supply = 2.25V
PLAY mode : ≤190mA (135mA typ.)
JUMP mode : ≤400mA (300mA typ.)
Stand-by mode : ≤200µA (100µA typ.)
Shock resistance
+X/-X direction : ≥4.0g
+Y/-Y direction : ≥4.0g
+Z/-Z direction : ≥3.0g
Headphone out (measured with 16Ω load, DBB off)
Output power (THD=10%)
/17 version only : 2x6mW (+1/-3dB)
all other versions : 2x3mW (+1/-3dB)
Frequency response (1mW) : 100Hz-20kHz within 6dB
S/N ratio (unwght) : ≥80dB (81dB typ.)
S/N ratio (A-wght) : ≥82dB (84dB typ.)
THD+N (1kHz, 1mW) : ≤1% (0.2% typ.)
Channel crosstalk (1kHz, no load): ≤-24dB (-44dB typ.)
Channel unbalance (-40dB) : ≤5dB
Volume attenuation (1kHz) : ≥60dB
Laser
Output power : <5mW (3mW typ.)
Wavelength : 780nm
Measurement setup
Use Audio Signal disc SBC429 4822 397 30184
Low pass filterDUT S/N and distortion meter
L
R
i.e. Sennheiser UPM550
with FF-filter
Level meter
i.e. Sound Technology ST1700Bi.e. 4822 395 30204
22kHz
13th order
FEATURE OVERVIEW
ELBATROP-DCFOSERUTAEF
”1BP–1SIROD“YLIMAFTCUDORP
0097ZA
)snoisrevlla(
1097ZA
)snoisrevlla(
YTILIBITAPMOCELBATIRWER-DC
●●
NOITCNUFEMUSER/DLOH
● / ●●/ ●
SEGATSBBD
11
KCABDEEFCITSUOCA
●●
YROMEMMARGORP
5151
HMiN/dCiNNOITCNUFEGRAHCER
–/––/–
DERAPERPLORTNOCETOMERDROC
––
TUPTUOLATIGID/ENIL
–/––/–
1 9 ......................stops CD play, clears a program or switches the
player off
2 DBB.................DIGITAL DYNAMIC BASS BOOST switches the
bass enhancement on and off
3 § .....................skips and searches CD tracks forwards
4 2; ....................switches the player on, starts or pauses CD play
5 ........................display
6 ∞ .....................skips and searches CD tracks backwards
7 PROGRAM......programs tracks and reviews the program
8 MODE..............selects the different playing possibilities:
SHUFFLE, SHUFFLE REPEAT ALL, REPEAT, REPEAT ALL
and SCAN
9 RESUME.........stores the last position of a CD track played
HOLD ..............locks all buttons
OFF.................switches RESUME and HOLD off
0 LINE OUT/p ....3.5mm headphone socket, socket to connect the
player to another analogue audio input of an
additional appliance
! VOL E ..........adjusts the volume
@ OPEN 2 ...........opens the CD lid
# 4.5V DC...........socket for external power supply
$ ........................typeplate
1-2
CS 46 640
CONNECTIONS AND CONTROLS
4
,
5
V
D
C
0
O
P
E
N
O
F
F
•
R
E
SU
M
E
•
H
O
L
D
L
I
N
E
O
U
T/
V
O
L
.
PROGRAM MODE
D
IG
IT
AL
D
BB
1
2
3
45
6
7
8
9
0
!
@
#
$
TROUBLESHOOTING (excerpt from the Instruction For Use)
Problem Possible cause Solution
No power, Batteries
playback does Batteries inserted incorrectly Insert the batteries
not start correctly
Batteries are empty Change the batteries
Contact pins are dirty Clean them with a cloth
Mains adapter
Loose connection Connect the adapter
securely
In-car use
Cigarette lighter is not Switch on ignition or insert
powered when ignition is off batteries
nF d1SC CD-RW (CD-R) is not Use FINALIZE on the
indication recorded properly CD Recorder to complete
the recording
no d1SC The CD is badly scratched Replace or clean the CD
indication or dirty
CD is not or incorrectly inserted Insert a CD, label upwards
The laser lens is steamed up Wait until the lens has
cleared
HoLd HOLD is activated Deactivate HOLD
indication
Electrostatic discharge Disconnect the set from
and/or
power supply or take out
no reaction
the batteries for a few
to controls
seconds
Problem Possible cause Solution
CD skips tracks The CD is damaged or dirty Replace or clean the CD
RESUME, SHUFFLE or PROGRAM Switch RESUME, SHUFFLE
is active or PROGRAM off
No sound or PAUSE is activated Press 2;
bad sound
Loose, wrong or dirty Check and clean
quality
connections connections
Volume is not adjusted Adjust the volume
Malfunctions due to vicinity Keep the player away from
of active mobile phones active mobile phones
Strong magnetic fields near Change the player’s
the player position or connections
In-car use
Cassette adapter is inserted Insert the cassette adapter
incorrectly correctly
Temperature inside the car Let the player adjust to
is too high/low the temperature
Cigarette lighter socket Clean the cigarette
is dirty lighter socket
Wrong playback direction of Change the autoreverse
the car cassette player’s direction
autoreverse feature
1-3
CS 46 641
ELBATROP-DCROFSEIROSSECCA
”1BP–1SIROD“YLIMAFTCUDORP
0097ZA1097ZA
00/z00/71/00/z00/10/50/11/31/61/81/91/
00/0713YA rotpadACD/CA716019122284XXXX
20/0713YA rotpadACD/CA676019122284XXX
50/0713YA rotpadACD/CA276019122284X
90/0713YA rotpadACD/CA976019122284 X
21/0713YA rotpadACD/CA176019122284X
31/0713YA rotpadACD/CAreilppuslacolX
71/0713YA rotpadACD/CA616019122284X
00/1053YA ettessaCrotpadAraC950017932284 OOOOOOOOOOOO
00/5453YA retrevnoCCD/CDraC330019122284 OOOOOOOOOOOO
00/7763YA )gulp-L(enohpraE400112422284 XX XXXXXXXXX
00/2863YA )gulp-L(enohpdaeH300112422284X
4643YA mm5.3(DROCIFIH → )gulp-L,hcnic188110232284 OOOOOOOOOOOO
elbaliavalanoitpo...O,tesehthtiwdeilppus...X
ACCESSORIES
1-4
CS 46 642
© WARNING
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 décharges statiques (ESD). Leur longévite
pourrait être considérablement écourtée par le fait qu´aucune
précaution nést prise à leur manipulation.
Lors de réparations, s´assurer de bien être relié au même
potentiel que la masse de l´appareil et enfileer 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.
d WARNUNG
Alle ICs und viele andere Halbleiter sind empfindlich
gegenüber elektrostatischen Entladungen (ESD).
Unsorgfältige Behandlung im Reparaturfall kann die
Lebensdauer drastisch reduzieren.
Sorgen Sie dafür, 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.
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 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 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.
©
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
i
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
ñ
Veiligheidsbepalingen vereisen, dat het apparaat in zijn
oorspronkeliijke toestand wordt teruggebracht en dat
onderdelen, identiek aan de gespecificeerde, worden toegepast.
De Veiligheidsonderdelen zijn aangeduid met het symbool
s Varning !
Osynlig laserstrålning när apparaten är öppnad och
spärren är urkopplad. Betrakta ej strålen.
∂ Advarsel !
Usynlig laserstråling ved åbning når sikkerhedsafbrydere
er ude af funktion. Undgå udsaettelse for stråling.
ß Varoitus !
Avatussa laitteessa ja suojalukituksen ohitettaessa olet alttiina
näkymättömälle laserisäteilylle. Älä katso säteeseen !
f
"Pour votre sécurite, ces documents doivent être utilisés par
des spécialistes agréés, seuls habilités à réparer votre
appareil en panne".
ESD
SAFETY
d
Bei jeder Reparatur sind die geltenden Sicherheitsvorschriften zu beachten. Der Originalzustand des Gerätes
darf nicht verändert werden. Für Reparaturen sind Originalersatzteile zu verwenden.
Sicherheitsbauteile sind durch das Symbol markiert.
f
Les normes de sécurité exigent que l`appareil soit remis
à l`état d`origine et que soient utilisées les pièces de
rechange identiques à celles spécifiées.
Les composants de sécurité sont marqués
CLASS 1
LASER PRODUCT
©
DANGER: Invisible laser radiation when open.
©
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.
AVOID DIRECT EXPOSURE TO BEAM.
©
AVAILABLE ESD PROTECTION EQUIPMENT :
anti-static table mat large 1200x650x1.25mm 4822 466 10953
small 600x650x1.25mm 4822 466 10958
anti-static wristband 4822 395 10223
connection box (3 press stud connections, 1MΩ) 4822 320 11307
extendible cable (2m, 2MΩ, to connect wristband to connection box) 4822 320 11305
connecting cable (3m, 2MΩ, to connect table mat to connection box) 4822 320 11306
earth cable (1MΩ, to connect any product to mat or to connection box) 4822 320 11308
KIT ESD3 (combining all 6 prior products - small table mat) 4822 310 10671
wristband tester 4822 344 13999
SAFETY & WARNINGS
2-1
CS 46 643
SERVICE HINTS
REPAIR POSITION COPPERSIDE
To get access to the copperside of the
printed board assembly proceed as follows:
1. Remove the bottom screws (6x)
2. Lift the bottom-cabinet
3. Supply the unit via external DC-socket
4. Take care that the door switch is closed during
measurements
To get access to the componentside of the
printed board assembly proceed as follows:
1. Remove the bottom screws (6x)
2. Open the CD-door
3. Lift the top-cabinet and put it backwards on the table
4. Supply the unit via the external DC-socket
5. Take care that the door switch is closed during
measurements
REPAIR POSITION COMPONENTSIDE
DISMANTLING THE CD-DOOR
To dismantle the CD-door proceed as follows:
1. Disconnect the membrane keyboard
(flex-foil connector on copperside of printed board)
2. Smoothly bend the bridge of the cabinet downwards as
shown in 1. Take care not to touch the lens
3. Smoothly pull out the right hinge of the CD-door as
shown in 2.
4. Lift the CD-door
Remark: Do not use screwdrivers or tools like that.
Sharp edges could damage hinge or cabinet part.
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