Well, this sounds like one of those many threads about laser failure and dirty lenses.
It is not.
A Philips CD 304MKII of mine was cleaned and aligned by myself at the end of March.
All ground connections were resoldered, bearings lubricated, laser cleaned and I even
aligned the swing arm.
(BTW I think the CD-304 is almost identical to the Marantz CD-84)
But after 10 weeks of listening, over the course over three days, the Philips failed to read CDs.
First, scratched CDs startet to fail.Now it would even not read a CD with tighter tolerances, specially made for alignment, Sony YEDS-18. I used this CD for alignment in March.
.
Very strange, because the eyepatterns amplitude is still up to the norm. (But much more blurry now)
This Player uses as CDM-1 swing arm transport.
Very important:
I swapped the CDM-1 to a second one (from a Philips CD-104),
including the circuit boards for discmotor and rf-amp, but the problem persists!
Thus I am sure the failure is not transport-related, but there is something
malfunctioning on the main servo-board.
To dig in very deep:
A fine tracking signal for the radial servo seems to miss or is distorted.
But:
This is more or less a guess becausethe reading-failure starts that early, that there is hardly no time to
monitor the fine tracking signal.
It can be measured @ point 30, pin2 of IC6218 on the main servo board.
In the service manual, this signal is not mentioned, a participant in a forum pointed this out to me.
Look at this post @DiyAudio:
http://www.diyaudio.com/forums/digi...-cdm-1-swing-arm-alignment-6.html#post5093670
Maybe there is a Philips afficionado @aidiokarma and the symptom described rings a bell...?
All the best,
Salar
It is not.
A Philips CD 304MKII of mine was cleaned and aligned by myself at the end of March.
All ground connections were resoldered, bearings lubricated, laser cleaned and I even
aligned the swing arm.
(BTW I think the CD-304 is almost identical to the Marantz CD-84)
But after 10 weeks of listening, over the course over three days, the Philips failed to read CDs.
First, scratched CDs startet to fail.Now it would even not read a CD with tighter tolerances, specially made for alignment, Sony YEDS-18. I used this CD for alignment in March.
.
Very strange, because the eyepatterns amplitude is still up to the norm. (But much more blurry now)
This Player uses as CDM-1 swing arm transport.
Very important:
I swapped the CDM-1 to a second one (from a Philips CD-104),
including the circuit boards for discmotor and rf-amp, but the problem persists!
Thus I am sure the failure is not transport-related, but there is something
malfunctioning on the main servo-board.
To dig in very deep:
A fine tracking signal for the radial servo seems to miss or is distorted.
But:
This is more or less a guess becausethe reading-failure starts that early, that there is hardly no time to
monitor the fine tracking signal.
It can be measured @ point 30, pin2 of IC6218 on the main servo board.
In the service manual, this signal is not mentioned, a participant in a forum pointed this out to me.
Look at this post @DiyAudio:
http://www.diyaudio.com/forums/digi...-cdm-1-swing-arm-alignment-6.html#post5093670
Maybe there is a Philips afficionado @aidiokarma and the symptom described rings a bell...?
All the best,
Salar
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