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Old 8th November 2006, 02:02 PM   #11
anatech is offline anatech  Canada
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Hi Salar,
There are two types of test disc. The first has a guarantied pitch and HF quality (signal strength) with few to no defects. The second type will have manufactured defects such as defective pit shape (and RF level), eccentricity and interruptions in data (simulated scratches of varying severity). Those discs are not possible to copy. The other discs ("standards") may be simulated by using good normal discs. The focus and tracking gain values will be different for a copy or another disc.

I hope that helps. I have many and know the differences between them. They cost me a fortune way back when.

-Chris
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Old 8th November 2006, 04:28 PM   #12
Salar is offline Salar  Germany
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Hi Chris!
As you said, a disc with a good RF pattern will as well help...
But I would like to use the YEDS as stated in the service manual, just to narrow down the possibility of faults I do in measuring.
The disc named in the service manual is "YEDS-18 Type 3 and 4"
The YEDS I found at a german seller is "only" called YEDS-18, so I have no Idea, if there is serveral issues of them.
Of coure it should be one with a garanteed pitch and HF quality
Copying is a no go, I know.

Another possibility for adjustment might the test disc "CD-Check" from Digital Recordings, because the Pierre Verany discs do not seem to be available anymore (But Old Colony Sound has no catalogue online)
The "CD-Check" only costs about 35$, containing defects in 5 levels, from no defects to level 5. I emailed them about the production quality, (pitch and HF quality), and got the following answer:

CD-CHECK is mainly designed for error correction and
tracking purposes. Other parameters of CD-CHECK disc
meet the standards of audio discs. Many companies are
using our product in manufacturing, adjustments and
repairs.

So i guess not good pitch and HF as a main goal?

But I tried a test signal of CD-Check uses, of course only playabe from a CD-ROM:
A 200hz sine with a 20050hz sine mixed at a level of -1dB. (Don´t know the level on CD-Check)
On the Nak, I heard audible clicks, in average about 2-3 in 90 seconds, one almost always audible about 2-3 Seconds after the beginning of the track (skipping to the beginning of the track within this time frame produced no clicks - something caused by the balance between laser motors and lens coils I guess)
My CDP-X5000 plays the tones perfectly. Should also be useful for judging the heads of a DAT-machine.

All the best,
Salar
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Old 8th November 2006, 04:57 PM   #13
anatech is offline anatech  Canada
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Hi Salar,
What you are after are specific defects in the CD tracks to test and adjust the servos. The PV disca use a 500 Hz tone to allow you to hear the defect's effects. I generally am watching the scope with teh sound a little audible.

So look for a test disc that tests a CD players tracking ability.

-Chris
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Old 8th November 2006, 06:59 PM   #14
Salar is offline Salar  Germany
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Hum,
I always thought, it should be the other way round?
A "reference" disc with no tolerances, perfect pit shape and refelectivity to reduce servo noise while adjusting?
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Old 8th November 2006, 07:04 PM   #15
anatech is offline anatech  Canada
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Hi Salar,
Yes, we need those. Then there are specific defects that we use to adjust the servos. Recovery from an error for instance. E-F balance will allow the beam to enter the proper track after going through an area of no data (scratch). So I adjust with a perfect disc and optimize with a defect disc. Customers do notice the difference.

-Chris
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Old 31st October 2007, 09:44 AM   #16
DMJ3000 is offline DMJ3000  Italy
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Hi, please someone can tell me what is the 2nd track of the Sony YEDS-18 CD?
Thank you.
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Old 31st October 2007, 10:17 PM   #17
Salar is offline Salar  Germany
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Hi DMJ3000
the 2nd track is 1kHz at 0dB (max.Level)
Ananatech, do you remember at which error level the Nak OMS5II/OMS7II show audible clicks?
I have a CD-Check test CD with error markings, as far as I remember, the test tone on this cd is a 400hz sine wave mixed together with a sinewave of about 18-20khz)
With an error of 0.375mm, my Nak already clicks...
Rrrors are printed on in five levels, from 0.375mm to 1.5mm.
All the best, Salar
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Old 1st November 2007, 02:15 AM   #18
anatech is offline anatech  Canada
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Hi Salar,
The type II didn't track as well as the original one. The original would track fine all the way through Pierre Verany except the horrible last double drop out tracks... After setting up the originals, I was disappointed by the II's. They are closer to an OMS-3/4 mechanism than anything. I believe it was the same head as well.

Still, much better than the Sony KSS-210A and KSS-240 types. I'm sorry I can't remember what was normal for them. Do watch for sticky center post for the lens assy. That will cause trouble that is hard to find when troubleshooting.

Also, keep in mind that different heads and servos react to defects totally differently. A single beam radial (Philips) will not react the same way as a single beam linear (NEC design) or a triple beam linear (most machines - Sony). So one will not track where another will and the other way around.

-Chris
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Old 1st November 2007, 10:26 AM   #19
DMJ3000 is offline DMJ3000  Italy
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Quote:
Originally posted by Salar
Hi DMJ3000
the 2nd track is 1kHz at 0dB (max.Level)
Great!
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Old 2nd November 2007, 07:03 PM   #20
Ghianni is offline Ghianni  Greece
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Please, anybody inform me if I can use the YEDS-18 CD for the adjustment of focus offset ? Thanks.
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