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Finally, an affordable CD Transport: the Shigaclone story
Finally, an affordable CD Transport: the Shigaclone story
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Old 19th May 2009, 07:46 PM   #3461
Jam Today is offline Jam Today  United Kingdom
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Quote:
Originally posted by somakmaitra
I am sorry I should have mention email instead of PM .
Sorry for the trouble .
No trouble Somak, and anyway it was my fault for not setting my settings properly.

Quote:
Originally posted by lancer
Hello Jam Today,

What is your email address?
Hello Lancer,

Thanks to Kevinkr, my e-mail link should be working now. I look forward to hearing from you soon.
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Old 19th May 2009, 08:03 PM   #3462
valo is offline valo  Norway
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Quote:
Originally posted by woodturner-fran
I need some help guys!!


I have 2 shigas - one (my own) working perfectly. Second one made for a friend and it has been killing the mechanisms. Right from new I had to put in a second mechanism. Then last week I got a call to say the shiga wouldn't read the TOC (hit the toc button, disc spins slowly and after a longer than normal spin time, you get 00 in the display). This is the same behaviour as if the crystal was dead (using the citizen one).

So I replaced the mech and it worked fine for about a week or so. It died again on the guy today.


So it must be some fault thats killing the mech. The box its in is earthed (ie to safety earth). PS is the same as Peter Daniels, MUR860 diodes, BG cap-7808-BGcap and then into the board. Votlage is dead on 8V.

Anyone any ideas? I can't remember anyone ever having this type of problem here before.

Fran

I did kill an mechanism , i dident isolate the the regulator from the ground plate that did have the same potential as the mechanism..
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Old 23rd May 2009, 02:09 PM   #3463
dijke308 is offline dijke308  Netherlands
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I have the same problem: My ps out of the box is dead on 8V and the 12V outupt is about 15V. I saw Rikkert had the same problem, but how did he solve it? For now, I think I am going out to buy a spare 51....
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Old 24th May 2009, 09:46 AM   #3464
Jam Today is offline Jam Today  United Kingdom
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Quote:
Originally posted by woodturner-fran
I need some help guys!!


I have 2 shigas - one (my own) working perfectly. Second one made for a friend and it has been killing the mechanisms.[snip]
Quote:
...it must be some fault thats killing the mech. The box its in is earthed (ie to safety earth). PS is the same as Peter Daniels, MUR860 diodes, BG cap-7808-BGcap and then into the board. Votlage is dead on 8V.

Anyone any ideas?[snip]
Hi Fran

You mention that it has killed mechanisms from the beginning, do you mean before you started modify it (Which would suggest the problem is with the original board and not the PSU.) or after?

If it was the later, I would start by replacing the 7808 with a know good one before moving on to the diodes.

BTW, you mention the PSU is earthed; you could try converting the shingaclone/psu to class II (as it was originally) or try using an RCD for a while, just in case your friend's main earth bond is faulty).

Hi Dijke

Quote:
Originally posted by dijke308
I have the same problem: My ps out of the box is dead on 8V and the 12V outupt is about 15V.
15 volts! :O Where did you take your measurements, before or after the diodes?

I also wonder if these could be from a faulty batch or if it is just coincidence? Did you two buy the faulty boomboxes from a shop or from somewhere like eBay, and do you know the date of manufacture or the serial numbers? If I remember correctly the date stamped on the inside of the case of Somak's and mine were between May and September last year and both came from Argos in the UK. I don't know serial numbers.
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Old 24th May 2009, 03:19 PM   #3465
audio1st is offline audio1st  United Kingdom
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Quote:
Originally posted by dijke308
I have the same problem: My ps out of the box is dead on 8V and the 12V outupt is about 15V. I saw Rikkert had the same problem, but how did he solve it? For now, I think I am going out to buy a spare 51....

I think we have a language problem here. I think Woodturner has built a power supply and has exactly 8.V.
I think you are trying to use the original PS and that needs to be modified to give you 8V.
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Old 24th May 2009, 09:23 PM   #3466
woodturner-fran is offline woodturner-fran  Ireland
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Yeah, just to clarify, I do have 8V output.


I did wonder about the earthing and you know it might well be something worth trying out. AFAIK, I don't even need it to be earthed as the supply into it is only 12V and is through an isolation transformer.

But its only actually the case thats grounded - circuit ground doesn't connect to the case ground. But maybe theres some odd static thing going on with it.

mmmm. I might just stick in an new mechanism and remove the PS ground and just see. That would be easier than replacing the whole main board.

This is an intermittent problem. I have a hunch that this thing is AOK nearly all the time, but ocaasionally some thing happens that kills the mech. I reckon static discharge would do that right?

Fran
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Old 25th May 2009, 01:21 PM   #3467
kevinkr is offline kevinkr  United States
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Finally, an affordable CD Transport: the Shigaclone story
Mechanism and case should be grounded together - and there should be a single ground connection to the electronics as well. The laser assembly is sensitive to esd, but I would be a bit suspicious of the controller board. I'd look for intermittent connections and cold solder joints.
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Old 25th May 2009, 09:24 PM   #3468
woodturner-fran is offline woodturner-fran  Ireland
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mmmm The mech and case is grounded, but theres no connection between circuit ground and the case. How about I put a connection in there with back to back diodes//10R resistor//0.01nF cap?

Probably no harm to have it anyway.


Think thats what I'll do and see does it take out another mech before going at my spare EZ51 board.


thanks to all

Fran
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Old 29th May 2009, 05:19 AM   #3469
Pocoyo is offline Pocoyo  Indonesia
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Default Hi

I start the CD mods now
i got simple a question

"Will the internal dac works if we cuts
the 3 bypass smd bypass capacitor behind ?"
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Old 29th May 2009, 05:19 AM   #3470
Pocoyo is offline Pocoyo  Indonesia
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Default Hi

I start the CD mods now
i got simple a question

"Will the internal dac works if we cuts
the 3 bypass smd bypass capacitor behind ?"
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