Finally, an affordable CD Transport: the Shigaclone story

[russcollinson]

Originally Posted by russcollinson

Hello all.
im hoping someone can help- i was given a part finished shigaclone by one of my customers early this year and im just now looking at it and trying to get my head around it.
it has a 24v transformer and a PS which appears to be deisgned following the schematic on this thread- The CD Transport with the exception of the regulator being LM317. they are housed in a wooden cigar box, and i did find out through some googling that this may mean the original maker possibly wasnt competent!

the PS does work and gives up to 24v output by adjusting the trimmer, however with the votage set correctly and connected to the transport the display just flashes "00" once and nothing else happens.
checking the voltage shows that it drops down around 2-3v with the load, even setting the PS output to 18v only gives 4v under load. the transformer outputs read 24v ac regardless.

the transport its self has also been modified as shown in the above thread, but in addition to the 5 components being removed also has c942 removed, as well as 2 cmt components which are next to it.

if anyone has any ideas id appreciate it.
Many thanks,
Russ.

PS- here is a photo showing te smt components that have been removed.
heres a stupid question- it will fire up without being connected to a dac right? i dont have dac yet so can connect one but sure it makes no difference?

Thanks again.
Russ.

[j baldam]

Hi Russ, I'm still on a learning curve with my naked shig but I have sorted it a little.
Please make sure it's only getting 8v dc otherwise something may fry.
It will power up and spin the disc and go through the motions of playing.
The red and black wire have to be joined together on power up to read the toc.
Pressing play will then play the tracks either using the remote or the buttons.

So put on a disc, join red and black together and power it. Display should read number of tracks, press play.

[apoopoo999]

I got everything working again on my shigaclone, currently I am testing out the KG 8v power supply as advised by jugi63. other mods are: 5v bobken regulator, hagclock and I got the vref reg to work.

[syklab]

Originally Posted by apoopoo999

I got everything working again on my shigaclone, currently I am testing out the KG 8v power supply as advised by jugi63. other mods are: 5v bobken regulator, hagclock and I got the vref reg to work.

That's looks great! I still have had a chance to try the vref yet, not quite understand to it works and how to connect it.

[uncle_leon]

Originally Posted by apoopoo999

I got everything working again on my shigaclone, currently I am testing out the KG 8v power supply as advised by jugi63. other mods are: 5v bobken regulator, hagclock and I got the vref reg to work.

Looks really cool... Is it intentional that one of the screws is different?

[apoopoo999]

Originally Posted by syklab

That's looks great! I still have had a chance to try the vref yet, not quite understand to it works and how to connect it.

Thanks, just follow the schematic in post #5022

Originally Posted by uncle_leon

Looks really cool... Is it intentional that one of the screws is different?

Thanks for helping me revive my shigaclone. I will eventually change the other 3 screws

[j baldam]

Hi
after reading the experiments concerning the magnetic puck, I sent for some 9mm magnettic stuff off ebay, fridge magnet backing.
I removed the heavy magnet and substituted a circle of the new stuff.
The disc seems to start more readily and smoothly but when it stops it takes a time and the puck stops before the disc.
I'm not sure if there is any attraction with the new magnet but I think there may be a minimal amount as without a magnet at all things are looser.
When my shig is complete I'll experiment further as there may be some mileage in this idea.

[j baldam]

for those like myself only doing the minimum of changes to the mainboard, I have just found that he biggest improvement is a good quality film cap in place of c960.
Early this morning at 2am I put a 0.22 630v Obligato cap in place of c960 electrolytic.
I could only test it at low volume at 2am but it sounded promising.
Tonight though I listened properly.
Not going to go into a great deal of detail but a vast improvement. So much so that that is it.
No more soldering to the board, all improvements from here on will be mechanical, fitting everything into a massy chassis.

Other changes are removing the two elecrolytic caps 916,912 and their ceramic bypasses and substituting 916. with a 470 50v Nichion Muse.

Oh I haven't got round to the digi out resistors yet so perhaps there may be another improvement to come.

[Turbon]

Hehe... I believe we should follow the shoe ;-)

[j baldam]

Originally Posted by Turbon

Hehe... I believe we should follow the shoe ;-)

sorry?

NEXT to Jesus on that first Christmas night, and spent the rest of his life trying to shed the residual aura that apparently fell upon him--running away from people who think he's the Messiah. One of his "followers" picks up a gourd that's been dropped during the fracas and holds it up to the rest, pronouncing it a sign. "Follow the gourd!" Then a would-be member of these sects in the city notices a sandal that Brian had lost during his escape, picks it up, and says, "No, follow the shoe!"

I see it's a quote from Pythons Life of Brian, very droll