My VRDS-7 doesn't read the TOC

[no@spam.please]

Hi everybody,
I'm trying to repair an old cd player, based on a VRDS-7 TEAC mechanic.
The problem is: when I put the disk (both original or cdr), the drawer
closes, the clamp loads the cd, the laser moves towards the center of
the disk and the disk starts spinning. After 4-5 sec, the disk stops and
the laser goes back to the home position (out of the disk area).
The track display shows '0'.

I cleaned the lens with iso-propylic alcohol and I can see the laser red
spot if I side-watch at the lens in the dark.
I marked the original position of the focus and track gain trimmers and
tried to move them, with poor results: the player makes some different
noises and seems to work a bit harder looking for the toc, but with no
different result :-(
I haven't looked at the laser eye diagram yet as I have no scope @home.
I don't know if it is a focus or track problem, or is a laser fault...
Does anybody have any idea? Any help will be highly appreciated.

Tony

 

[no@spam.please]

Arfa Daily ha scritto:

no@spam.please> wrote in message
news:48987cad$0$18150$4fafbaef@reader3.news.tin.it...

The problem is: when I put the disk (both original or cdr), the drawer
closes, the clamp loads the cd, the laser moves towards the center of the
disk and the disk starts spinning. After 4-5 sec, the disk stops and the
laser goes back to the home position (out of the disk area).

I don't know if it is a focus or track problem, or is a laser fault...

Those symptoms are pretty typical of a worn laser. Looking at the eye
pattern may help with diagnosis. If you can find a marked test point for it,
most manufacturers have the level there pretty much 'standardised' at about
1v p-p.

Arfa

Thanks Arfa, I'll bring the player @work and scope it. I don't know how
the TP1 test point pinout, but found the RFO pin on the Sony ICX1367
This transport uses Sony KSS-240a laser pickup. I've read on the net
that Sony made 3 different versions of it and that not all fit the
VRDS-7. Do you know how to avoid buying the wrong spare part?
Regards,
Tony

 

[no@spam.please]

Mark D. Zacharias ha scritto:

no@spam.please> wrote in message
news:48996d59$0$40316$4fafbaef@reader5.news.tin.it...

The KSS-240A is readily available - I get them from East Coast Transistor
Parts. 1-800-645-3516. They run about 35.00 plus freight. They're a little
more expensive because the 240 includes the RF amp, laser power, tracking
adjustments, RF balance etc all together as part of the pickup assembly,
unlike cheaper pickups like the KSS-213.

Mark Z.

Thank you Mark! Do you know anything more about the 3 different Sony
versions of the KSS-240A and how to recognize the correct one?
I found it on some german/uk spare part sellers too (I live in Italy and
shipping is likely faster), even at lower prices, but I'm wary of them.

Tony

 

[no@spam.please]

Mark D. Zacharias ha scritto:

What he said. Should be a pretty standard KSS-240A.

mz

Thank you all! I'll buy a new original laser and let you know.
Tony