Finally, an affordable CD Transport: the Shigaclone story - Page 632 - diyAudio
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Old 1st October 2012, 07:46 PM   #6311
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Hi everyone, I managed to find some time to put together the shigaclone.

But I cant get it to work snif ...
Click the image to open in full size.

power supply is fine 8v dc.
Click the image to open in full size.

All the V1 thru V4 are 5v.
All IC are oriented according to the silk screen and solder joints have been inspected several times with 10X jewelers loupe.

I know I screwed up 3 things.

1. powered up with mechanism laser short in place.

2. powered up with inverted motor spindle/sled/limit switch connector.

3. powered up with inverted lcd connector (18pin thing).

What does it do?

when powered up the disk spins and searches the disk the lcd display shows "--"
once complete the lcd display shows "00" but will accept no more inputs only the TOC button works repeating the read cycle.

I will post some pictures soon.

Last edited by blueworm; 1st October 2012 at 07:59 PM. Reason: bad link
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Old 2nd October 2012, 12:12 AM   #6312
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First up - I can't see your pics...

I've seen this problem a couple of times with some of the shigas I've built. It has always been a problem with the crystal (or reclock circuit). In one case I replaced the citizen crystal with another one, another I had to clean up the pad a little better to solder it on, and in the 3rd case my own clumsiness killed one of the 74ACT14/74AS74 chips in the reclock circuit.

Based on that and my poor understanding of how it all works I can only suggest looking at the crystal, its power supply, connections etc etc.

Maybe tibi can supply more/better suggestions...

Fingers crossed for you.

Fran

Last edited by woodturner-fran; 2nd October 2012 at 12:14 AM.
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Old 2nd October 2012, 02:54 AM   #6313
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Click the image to open in full size. Uploaded with ImageShack.us Thanks woodturner-fran, will try the crystal since I have one laying about, I'm inclined to believe at present that I fryed the LC78601 by inverting its cable. Click the image to open in full size. Uploaded with ImageShack.us Click the image to open in full size. Uploaded with ImageShack.us Click the image to open in full size. Uploaded with ImageShack.us Click the image to open in full size. Uploaded with ImageShack.us
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Old 2nd October 2012, 07:23 AM   #6314
tvicol is offline tvicol  Romania
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blueworm,

If you are not using Citizen cristal, load your cristal up to datasheet specifications.
In our full kit we provide Citizen CSA-309, therefore C57 and C58 are 8 pF.

The transport will not take any further commands until the TOC is read.

Regards,
Tibi
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Old 2nd October 2012, 07:40 AM   #6315
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Tibi,
My crystal is the Mouser BOM one not the recomender CSA-309.
Ok will play around with the crystal and loading will report back ASAP.
Thank you.
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Old 2nd October 2012, 07:43 AM   #6316
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I seem to remember Peter Daniels acheived the loading using some twisted pair wire ... if its only a few pF that might do for testing purposes.
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Old 2nd October 2012, 07:44 AM   #6317
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If is Mouser part than C57 and C58 are 18pF.
See also crystal datasheet.

Mouser Part #: 695-HC49US-169-U
Manufacturer Part #: HC49US-16.9344MABJ-UB
Manufacturer: Citizen
Description: Crystals 16.9344MHz 18pF

Over each cap add one more 10pF or at least one more 8pF.
Also have a look with a camera or phone on the laser (not direct eye) to see if is working.

Regards,
Tibi
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Last edited by tvicol; 2nd October 2012 at 07:58 AM.
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Old 2nd October 2012, 09:09 AM   #6318
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Tibi,
I recall one of your test videos the laser can be seen quite clearly.
Here is a video I shot yesterday: shiga laser test - YouTube

and another: shiga laser test 2 - YouTube
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Old 2nd October 2012, 11:08 AM   #6319
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Quote:
Originally Posted by blueworm View Post
Tibi,
I recall one of your test videos the laser can be seen quite clearly.
Here is a video I shot yesterday: shiga laser test - YouTube

and another: shiga laser test 2 - YouTube
Looks like your laser is not working.
Check also Q1 and measure collector current while operation.

Regards,
Tibi
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Old 2nd October 2012, 01:43 PM   #6320
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Just got done testing Q1 collector 42.1 mA with disk spinning and 2.5mA at idle.
Measured voltages also: whilst spinning. E. 4.58v C. 1.83v B. 3.84v
Click the image to open in full size. Uploaded with ImageShack.us Just stacked the 10pFcaps on C57 C58 at least that should be ok now. Click the image to open in full size. Uploaded with ImageShack.us Laser still does not seem to work.

Last edited by blueworm; 2nd October 2012 at 01:59 PM.
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