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Old 18th March 2013, 11:45 AM   #6941
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Quote:
Originally Posted by tonyptony View Post
Thank you Erik. I was going to pull out my old spool of lacing cord to lace up the cables going to the transport, but I just didn't feel like it when the tie wraps were so close. Right now it's playing Tibi's test CD in Repeat mode to give it a good running.

If you can provide any guidance on the grounding scheme I'd appreciate it.
Hi

In the beginning I tried out a lot of different grounding schemes...all I could say about it is that it kept introducing new errors...and on the other hand I could not detect an improvement soundwise.

Nowadays I have stopped completely with grounding (besides the safety-grounding I use a lot of copper ).
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Old 18th March 2013, 12:51 PM   #6942
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So are you simply tying the AC input safety ground to the copper baseplate you use for the transport mechanism?
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Old 18th March 2013, 12:57 PM   #6943
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Originally Posted by tonyptony View Post
So are you simply tying the AC input safety ground to the copper baseplate you use for the transport mechanism?
Yepp and furthermore the outside parts of my PiTbull are made safe to the touch....and I make use of a fuse as well (althought that can/does bring a little bit of detoriation to the sound but safety first).
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Old 18th March 2013, 03:09 PM   #6944
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Tibi, I think this mechanism is toast. The first one of the pair I got in my bundle from you works fine. This one, no matter what I do to adjust the platform height, yields nothing. I can definitely confirm again the solder blob has been correctly removed.

I even tried a third unit I have (a three ball chuck version that I bought before we got everything worked out with the puck) and it too works fine. I'm pretty sure this one is dead. It's unlikely to be an ESD problem as I've treated all three (the two I got from you and the three-ball version) the same way, using an anti-static mat and the same care in handling after the blob was removed.
Tibi, what is my course of action here? Also, based on dimkasta's reporting, is your source for the mechanism's preferred over what is available via eBay? I know you can't really answer that, but I guess I'm wondering if you're getting them from a place there's a better sense of what we're getting.
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Old 18th March 2013, 08:07 PM   #6945
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The logos on the boards where the same. The layout was kinda different. But as I said my test was pretty short
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Old 18th March 2013, 10:42 PM   #6946
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What's the odds of having 4 bad transports? Very low, so I spent a little more time on researching the specs. Here are what I found maybe helpful to others:
  1. If you haven't, download the transport specs sheet from Tibi's site. That's what I used to come to my solution.
  2. There are 4 possible motor and 2 laser pickup manufacturers, plus other parts suppliers. Looking at my transport stocks (3 from Tibi, 1 from US, 1 from UK, 2 oriignal JVS EZ31), all of them are a little different from the others. I believe the quality of them are very close.
  3. From manufacturer, there table height are actually within the specs: 19.25mm - 19.60mm. IMHO, try adjusting the table up and down increases the chance of bending th4 spindle is greater.
  4. This is the most important that got all my transport to work. When you look at the laser pickup with the 16 pin connector facing you, there is a pot at the lower right corner. It is a VR that connects the pins 11 and 12. It is used to adjust the laser. In my first try, I turned this clockwise 180 degree, and the transport started reading a pressed CD toc but not a CDR. I turned the pot 90 degress more, still no dice to the CDR. I then turned the port counter clockwise 180 degress (net effect was 90% clockwise). The CDR's toc was also displayed. If your transport has the right table height and not reading anything, give this a try.
  5. They are all made in China, just kidding to see you read this far
Now all my transports are working!!
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Old 19th March 2013, 12:12 AM   #6947
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Fred, interesting. Are the three from Tibi all the same? What was the source of the one from the US? Do any of the others look like the ones from Tibi?
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Old 19th March 2013, 01:30 AM   #6948
pchw is offline pchw  United States
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Hi Tony,

3 of the transports were from Tibi (set #1), one was from a US ebay seller (set #2), and 2 3-balls from UK seller (set #3). If I added the 2 JVC mechanism, there are a total of 6 different motors/laser pickup combos!! No kidding, even the 2 original shiga mechanisms have different motors.

From your previous post, one of yours seemed to be not working at all. So, give it a try, there is nothing to lose, but do adjust the table height back to the range. I think the lens focal length is designed for this height.

Good luck!!
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Old 19th March 2013, 09:55 AM   #6949
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Quote:
Originally Posted by tonyptony View Post
Tibi, this was difficult to do, but I think I have a picture of what happens when Track 13 palys. I had to hit the "Auto" button on my Tek 2465A in hopes that it got what you need. I also had to really play with the levels and contrast on the image to get it to show up (it's fine on the 'scope display but I had to use flash to get the image, so it's a bit washed out). I placed the probe on the chip side of C41 and the ground on the digital out "-" terminal.
Yep, this is eye pattern and looks very good.

Regards,
Tibi
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Old 19th March 2013, 10:08 AM   #6950
tvicol is online now tvicol  Romania
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Quote:
Originally Posted by tonyptony View Post
Tibi, what is my course of action here? Also, based on dimkasta's reporting, is your source for the mechanism's preferred over what is available via eBay? I know you can't really answer that, but I guess I'm wondering if you're getting them from a place there's a better sense of what we're getting.
All these mechanics are made by various Chinese manufacturers.
It is very hard to tell which one is the best.
Have a look in the mechanic datasheet and youŽll see that there are various options for optics and motors on the same manufacturer.
http://www.vicol-audio.ro/docs/DA11VZ.pdf
For spindle/sled motor you may have one of these:
MABUCHI MOTOR Co., Ltd.
RF-310TC
MABUCHI MOTOR Co., Ltd.
2418OPA
SANYO Seimitsu Co., Ltd.
KRF-310TA-11400-38L
SHENZHEN BAOAN
KAIDA MICRO-MOTOR

For laser you may have:
SANYO DL-3150-101
ROHM RLD78MYA1

For pin diodes you may have:
NEC: PH901
MITSUMI: MM1597XB
KODENSHI: PIC–6710
Capella: CM1286

and I bet there are few more options as well.


Regards,
Tibi
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