Philips CD304 MK II - Demounting Procedures; Fuse Replacement

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.