02.12.2005, 19:55
Der marantz-cd73 basiert auf dem philips-cd300,der wie unten zu lesen ist, die ähnliche "crackle" Probleme hat .(1983)Philips hat
Ich habe auch mehrere Philips mit ähnlichen Temperaturproblemen
zb der 104 und der 204:
Obwohl sie völlig unterschiedlich aufgebaut sind,(einer konventionell,einer in smd-Technik-jedoch mit gleichem Schaltplan!)haben beide einentemperaturabhängigen Fehler gehabt.Nach langem Suchen mit Lupe und "Delta T-Versuchen" ,fand ich kalte Lötstellen.Nachlöten behob die Geschichte.
Die Fertigung der Platinen scheint vor 23Jahren bei diesen baureihen noch nicht so perfekt gewesen zu sein.
Aus dem US Service forum:
Philips CD300 1983 CD player not bad for daily use for 20 years
CD carrier problem and intermittent crackle/static noise on both channels.
Carrier first seemed to be belt problem. Mark the position of the 3 cord passes
on the "dial cord" drum as there is a locus cam under this pulley that activates
the CD top clamp . Disconnect the chassis fixing of this cord and put a knot in it
at that end to take up some of the stretch as at end of adjustment range.
Remove the motor sub-assembly
and 2 circlips retaining the final 2 drive cogs to replace belt. Problem was
actually initiating front panel switch problems due to poor soldering/design on the pcb.
Remove the right hand chassis panel. Change of switch spec but using original
pcb design the switch thru-board pins were too small for the holes and disc of
solder rather than cones of solder and over time with creep or thermal /vibration
had broken in rings over gaps. Also resoldered other large pins on this board.
Especially as mains carried on this board increased the size of the screw holding
to chassis (too fine thread for the thin sheet).
Crackle / static and high frequency whine seemed to be associated with the LM337T
-ve regulator as again broken soldering in this area. But with 0V (contact break) on the output no static
and -7V o/p return of crackle. Probably due to bad seating of SAA7030 in socket.
Data on these old Mullard /Philips CD SAA7000 series ICs (probably manufactured
in Southampton) in Signetics 1984 Linear LSI manual.
Philips CD300
All control functions and output but flickering track indicator LED display.
I could not activate this fault and had to rely on the fault as reported by
the owner. There are 3 ribbon cables to the sliding carriage. Disconnecting
the ribbon nearest the CD platten the Unit would function fine but no LED
display. As this ribbon touched the corner of the frame of the mains
transformer whenever the carriage retracted to play position I assumed
problem was in the ribbon but could not find it. Disconnected and
refixed swapping ends and tied back all 3 ribbons so no longer could
touch the transformer. Unit did not come bouncing back from the owner.
Ich habe auch mehrere Philips mit ähnlichen Temperaturproblemen
zb der 104 und der 204:
Obwohl sie völlig unterschiedlich aufgebaut sind,(einer konventionell,einer in smd-Technik-jedoch mit gleichem Schaltplan!)haben beide einentemperaturabhängigen Fehler gehabt.Nach langem Suchen mit Lupe und "Delta T-Versuchen" ,fand ich kalte Lötstellen.Nachlöten behob die Geschichte.
Die Fertigung der Platinen scheint vor 23Jahren bei diesen baureihen noch nicht so perfekt gewesen zu sein.
Aus dem US Service forum:
Philips CD300 1983 CD player not bad for daily use for 20 years
CD carrier problem and intermittent crackle/static noise on both channels.
Carrier first seemed to be belt problem. Mark the position of the 3 cord passes
on the "dial cord" drum as there is a locus cam under this pulley that activates
the CD top clamp . Disconnect the chassis fixing of this cord and put a knot in it
at that end to take up some of the stretch as at end of adjustment range.
Remove the motor sub-assembly
and 2 circlips retaining the final 2 drive cogs to replace belt. Problem was
actually initiating front panel switch problems due to poor soldering/design on the pcb.
Remove the right hand chassis panel. Change of switch spec but using original
pcb design the switch thru-board pins were too small for the holes and disc of
solder rather than cones of solder and over time with creep or thermal /vibration
had broken in rings over gaps. Also resoldered other large pins on this board.
Especially as mains carried on this board increased the size of the screw holding
to chassis (too fine thread for the thin sheet).
Crackle / static and high frequency whine seemed to be associated with the LM337T
-ve regulator as again broken soldering in this area. But with 0V (contact break) on the output no static
and -7V o/p return of crackle. Probably due to bad seating of SAA7030 in socket.
Data on these old Mullard /Philips CD SAA7000 series ICs (probably manufactured
in Southampton) in Signetics 1984 Linear LSI manual.
Philips CD300
All control functions and output but flickering track indicator LED display.
I could not activate this fault and had to rely on the fault as reported by
the owner. There are 3 ribbon cables to the sliding carriage. Disconnecting
the ribbon nearest the CD platten the Unit would function fine but no LED
display. As this ribbon touched the corner of the frame of the mains
transformer whenever the carriage retracted to play position I assumed
problem was in the ribbon but could not find it. Disconnected and
refixed swapping ends and tied back all 3 ribbons so no longer could
touch the transformer. Unit did not come bouncing back from the owner.