Philips CD304 MK II - Servicing Hints; Service Aids and Tools

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