Philips CD304 MK II User manual

Compact disc player CD304 MK Il/coryesr
Service
Service
Service
35493 A12,
For servicing hints for the CD mechanism see
Service Manual C.D.M.-1.
ervice Manual
DIGITAL AUDIO
CONTENTS
1. Elucidation on the lay-out and table of contents per
page.
. Control buttons and technical specification.
. Servicing hints.
. Measurements and adjustments.
. Exploded views and parts lists of mechanical parts.
. Block diagram, circuit diagrams, data on PCBs, parts
lists of electrical parts and wiring diagram.
. Faultfinding method.
Remote control.
Onh WP
On
CLASS 1
Safety regulations require that the set be restored to its original 3127 10 aa
condition and that parts which are identical with those specified be
used.
Documentation Technique Service Dokumentation Documentazione di Servizio Huolte-Ohje Manual de Servicio Manual de Servicio
Subject to modification PH | LI PS Published bysesrvice
4822 725 21058 Consumer Elictronics ,
Printed in The Netherlands
© Copyright reserved CS 5 188 GB

UGE
1. ELUCIDATION ON THE LAYOUT OF THE DOCU-
MENTATION
The documentation consists of chapters.
The number ofthe chapter is indicated by the first digit of
the page number.
The second digit of the page number is the sequence
numbering.
If modifications or supplements require new supple-
mentary or replacement pages, the page number is
extended with a third part:
A digit behind the page number indicates that it concerns
a supplementary page.
A replacement page is indicated by a letter behind the
page number.
CS 5 189 6B
1-1
Example
3-6 is page 6 of chapter 3
3-6-1 is a supplementary page behind page 3-6
3-6-a is the replacement page of page 3-6 (so page 3-6
can be removed from the documentation).
All pages are provided with a date of issue.

TABLE OF CONTENTS PER PAGE
Chapter Page Contents Chapter
1 1-1 Elucidation on the lay-out of the 6
documentation
1-2 Table of contents per page
2-1 Control buttons
2-2 Technical specification
3-1 Servicing hints
3-2 List of service aids
Initiating the service loops
Demounting the top cover
Demounting the bottom plate
Replacing glass fuse 1451
Replacing the transformer fuse
Servicing the front
Demounting the control
and display PCB
Demounting the headphone
amplifier PCB
3-3 Servicing the supply PCB
Servicing the servo and decoder
PCB
Servicing the IR receiver
3-4 Servicing the tray mechanism
4-1 Mechanical measurements
and adjustments to be
performed on the CDM
Mechanical adjustments of the
tray mechanism
4-2 Specification measurement
Changing the transformer
connections
Laser power supply 7
(POS. VOLT. SH.)
Checking and adjusting
Adjusting the focus bandwidth
Check of the AGC and offset
circuits
5 5-1 Parts list
Exploded view tray
5-2 Exploded view cabinet
Parts list
6 6-1 Block diagram
6-2 Circuit diagram of the
power supply 8
6-3 Power supply PCBs
Parts list
Mains filter circuit
6-4 Circuit diagram of the
control and
display circuit
6-5 Control and display
PCBs
Parts list
6-6 Circuit diagram servo
Circuit (part 1)
Page
6-7
6-9
6-10
6-14
6-12
6-13
6-16
6-17
6-18
WP PPT NO ODM
ONNNNN ~o14 i wood
p-o
se i)
Contents ~
Servo PCB
Parts list
Servo PCB
Parts list
Circuit diagram servo
Circuit (part 2)
Circuit diagram
Decoding circuit (part 1)
Decoding PCB
Parts list
Decoding PCB
Parts list
Circuit diagram
Decoding circuit
(part 2)
Circuit diagram
Tray control PCB
Parts list
Circuit diagram of
headphone amplifier
Headphone amplifier PCB
Parts list
Circuit diagram of the
IR receiver
PCB drawing of the IR
receiver
Wiring diagram for
CD304/60R/65R
List of standard symbols
List of chip components
Faultfinding method
Faultfinding method
Faultfinding method
Faultfinding method
Faultfinding method
Faultfinding method
* Faultfinding method
Faultfinding method
Faultfinding method
Faultfinding method
Faultfinding method
Faultfinding method
Exploded view of the
remote control
Parts list
Circuit diagram of the
remote control
PCB drawings of the
remote control
CS 5 199.GB

DIGITAL AUDIO
2. CONTROLS
22
OMAN Oak WN =
— «a —_— ©
ON/OFF
OPEN/CLOSE
TIME
TRACK
SCAN
SELECT down
SELECT up
STORE
CANCEL
Headphone socket
Headphone level potentiometer
SK1
SK15
SK12
SK5
SK13
SK6
SK14
SK7
SK11
BU1
3751
2 3456789 11 10 12 13 1415
12
13
14
15
16
17
18
19
20
21
22
21 20
PREVIOUS
NEXT
REPEAT
PAUSE
SEARCH REVERSE
SEARCH FORWARD
START/REPLAY
STOP/Clear Memory
DIGITAL OUTPUT
FTD DISPLAY
INPUT IR REMOTE CONTROL
SK4
SK10
SK18
SK9
SK19
SK8
SK17
SK16
BU3
1051
6851
2-1
18
19
16
17
CS 5 191GB

-2
ECHNICAL SPECIFICATION
System
Mains voltages
Mains
frequencies
Power
consumption
Frequency range
‘Output voltage
‘Output
impedance
‘S/N ratio
: Compact Disc Digital
Audio System
:110 V, 127 V, 220 V, 240 V
+ 10% (to be changed
by changing the
transformer connections)
: 50 Hz, 60 Hz (no conver-
sion required)
:< 25W
:2 Hz + 20 kHz + 0.05 dB
: O-max. 2 Vrms
: 200 Q
: = 96 dB
® Headphone
~ output voltage
— output
impedance
e Channel
separation
® Channel
difference
© Overall harmonic
distortion
@ Intermodulation-
distortion
© De-emphasis
e Dimensions
(wxhxd)
© Weight
The above specifications apply within a frequency range of 20 Hz + 20 kHz
CS § 192 GB
: 0-max. 5.6 Vrms
>= 15002
: = 93 dB
:< 0.6 dB
> <= 0.003%
: <= 0.003%
: 50 ps or 15 ps (switched
by the subcode on the disc)
: 420x92x300 mm
(tray closed)
: 420x92x450 mm
(tray opened)
> approx. 7 kg

DIGITAL AUDIO
3. SERVICING HINTS
In order to prevent loose metal objects from getting in
the CD mechanism it will be necessary to see to a
clear repair station.
Before the player is being used or serviced, the
transportation screws should be removed.
These screws have to be reapplied after servicing.
The objective can be cleaned with a blow brush.
For servicing hints for the CD mechanism refer to
Service Manual CDM-0 and CDN-1.
Do not loosen any screws other than those mentioned
in the hints.
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.
GENERAL
CHIP
COMPONENT
SOLDER SOLDER
COPPER TRACK
Sic PCB
GLUE
SOLDERING
fe}
SOLDERING
IRON
SERVICE PACKAGE
DISMOUNTING
VACUUM PISTON
SOLDERING 4822 395 10082
IRON ™~ Xi
e.g WELLER
SOLDER TIP PT-H7
SOLDERING
IRON
SOLDER WICK
4822 321 40042
e.g. A PAIR OF TWEEZERS
HEATING
x
SOLDERING IRON
SOLDER WICK =
CHIP
COMPONENT
Fig. 2
PRECAUTIONS
3-1
The disc should always bed down well on the
turntable.
For this purpose a disc hold-down has been mounted
in a bracket of the drawer mechanism.
When the drawer mechanism has to be demounted for
repair, a loose hold-down should be employed.
The set can then function normally.
Code number of the disc hold-down is 4822 532 60906.
SERVICE AIDS
Service supports
Audio performance test disc
Disc without local defects,
Disc with DO failures, black spots
and finger-prints
4822 395 30202
4822 397 30085
4822 397 30096
Screwdriver set TORX
Set straight 4822 395 50145
Set square 4822 395 50132
Disc hold down 4822 532 60906
7 th order filter 4822 395 30204
IR receiver 4822 212 21449
MOUNTING
e.g. A PAIR OF TWEEZERS
Wy
SOLDER
@0.5 - 0.8 mm
SOLDERING
IRON ;
OR
PRESSURE
+
SOLDER
@0.5 - 0.8mm
SOLDERING TIME
<3 sec/side
B
PRESSURE
/
SOLDERING
t +
IRON
/_ HEATING
“
CLEANING EXAMPLES
27 012C12
CS § 193 GB

3-2
The servo uP can beset to the servicing mode to check the
switch and display PCB and to separately test the servo
systems.
INITIATING SERVICE LOOP A
-—— Put a disc on the turntable.
— Simultaneously depress the CANCEL, PREVIOUS
and STOP keys.
Keep these three keys depressed while switching on
the mains voltage. In this situation the laser and focus
contro! are operative and the turntable motor is
running.
The light pen remains situated under the lead-in
tracks. The radial servo system is switched off.
In this service loop the display can be checked as
follows:
— The display will indicate 01.02, then 02.04, 03.06 and
continue in this way up to 20.40. 20.40 is followed
again by 00.00, 01.02, etc.
The indicators SCAN, PAUSE, REPEAT and DISC
ERROR will light up and will remain switched on.
At indication 01.02, bar 1 of the track bar is also driven
and at 02.04 bar 2, etc.
— If now the CANCEL key is depressed, the TRACK
indication will light up after 2 clock strokes of the
display and the DISC ERROR indication will go off.
The player stays in service loop A.
INITIATING SERVICE LOOP B
The player can be brought from service loop A into service
loop B by depressing the STORE key. Now the radial
servo system has been switched on independently of the
P-bit and the sub-code.
The display makes clear that the set is in service loop B by
means of ABS, REL and TOT.
The player can be brought from service loop B in the
PLAY mode by depressing the START/REPLAY key.
For adjustments that have to be performed on the lower
side for which the unit should be in the position of normal
end use, servicing supports are supplied.
Code number is 4822 395 30202.
These supports can be mounted in the four holes of the
frame.
DEMOUNTING THE TOP COVER
— Remove the 4 screws in the sides.
— Remove the cover from the set by pulling it backwards.
Attention
When mounting the top cover; care should be taken that
the top cover is placed correctly in the guidings of the
front before mounting the four screws.
CS 5 194¢6R
DEMOUNTING THE BOTTOM PLATE
— Remove the 4 screws in the bottom plate.
— Pick up the bottom plate at the rear of the set and pull it
from the 3 fixing bosses at the front of the set.
REPLACING GLASS FUSE 1451
— Remove the top cover.
— The fuse on the mains filter PCB can now be reached
at the left-hand side of the set via a hole in the mains
filter housing.
REPLACING THE TRANSFORMER FUSE
— Remove the bottom plate.
— Remove the plastic cap covering the underside of the
transformer.
— The transformer fuse is now accessible.
— Replace the screening cap once the fuse has been
replaced.
SERVICING THE FRONT
Demounting the front.
— Remove the top cover.
— Remove the 3 fixing screws at the upper side and the3
screws at the lower side of the front.
— The front can now be removed from the set by pulling
it forwards.
— After loosening various connections and connectors,
the front of the set can be removed.
Demounting the control and display PCB
— Remove the 9 screws on the control and display PCB.
— The PCB can now be taken away with the headphone
PCB still in place.
Demounting the headphone PCB
Once the control and display PCB has been taken away,
the headphone PCB can be removed.

SERVICING THE SUPPLY PCB
— Remove the 2 screws B (see Fig. 3a).
— When the connectors have been loosened, the supply
PCB can be taken out of the set from the rear.
Attention
The Audio cable is soldered to the decoder PCB.
When mounting the supply PCB care should be taken that
the PCB falls in the guiding on the frame.
SERVICING THE SERVO PCB AND THE DECODER PCB
(see Fig. 3a)
— Remove the top cover.
— Remove the 2 screws A on the PCB holder.
— When the PCB holder is placed in the service position
(see Fig. 4) measurement can be performed on both
the servo PCB and the decoder PCB.
SERVICING THE IR RECEIVER
For practical reasons, it is best to service the IR receiver
by means of the trial and error method, with which
defects, if any, are traced.
Code number of IR receiver: 4822 212 21449.
After removing the bottom plate, this receiver can be con-
nected via plug 91.
Demounting the IR receiver:
— Remove the top cover.
— Remove the loading mechanism
— When clamping spring 555 has been removed, the
receiver can be demounted.
Before mounting the new receiver, be sure to first adapt it
according to the originally mounted version.
as
SERVO PC.B
==
Qe HEAOPHONE PC.B.
CONTROL AND.
DISPLAY PC.By
CONTROL +DISPLAY PCB.
Fig. 3b 36 SOTAT
36 600 87
Fig. 3a:
3G 59987
Fig. 4
CS 5195GB

3-4
SERVICING THE TRAY MECHANISM
Demounting the tray mechanism
— Remove the top cover.
— Remove the front.
~— Remove the 4 screws C (see Fig. 3a).
— Loosenconnectors 61 and 64 on the tray control PCB.
— The tray mechanism can now be taken out of the set.
— For repairs the tray mechanism can be made operative
outside the set by fixing again connectors 61 and 64
on the drawer control PCB.
— Involtageless condition the drawer can be opened by
moving the drawer forward by means of a non-
scratching sharp device (for example finger nails) that
is placed between front and drawer.
Attention
If, during arepair, the tray mechanism or the tray control
PCB has been demounted, the set will not function.
To avoid this the contacts of the tray in-end switch SK2 on
the tray control PCB should be interconnected.
Replacing the disc hold-down
— See: Exploded View Tray.
— Place the disc hold-down (item 107) in its highest
position (drawer opened as far as possible).
— The disc hold-down can be loosened by bending the 2
lugs on bracket item 508 apart and taking out the disc
hold-down.
CS 5 196 GB
Replacing the tray motor
— See: Exploded View Tray.
— Demount the tray mechanism.
— Remove the belt (item 129) from the motor pulley.
— Remove the 2 screws with item no. 119.
— The motor can now be loosened.
Demounting the drawer (item 127) and lifting piate (item
513) assy
See: Exploded View Tray.
— Demount the tray mechanism.
— Remove motor bracket item 509 by undoing the 3
screws on bracket item 509.
— Remove roller item 108 by loosening the spring ring.
— Slide the tray forward and remove it.