VINTAGE sTIX st-305 DRUM MACHINE ISSUE

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wahee
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VINTAGE sTIX st-305 DRUM MACHINE ISSUE

Post by wahee » Sat Feb 01, 2020 8:20 pm

Hi all

just wondering if anyone would have a schematic or service manual for this machine.

I have one in bad shape. It is now working but the audio out is incredibly low.

The individual outs are ok level just the mix.

I have checked the 7555 IC and associated caps and they check out. Volume pot has been cleaned and eliminated.

I suspect a component in the mix circuit maybe bringing the output down.

The circuit is a bit busy so was hoping a schematic was available
cheers
Crystalline Stricture now on
tonnrecordings.com

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MacroDX
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Re: VINTAGE sTIX st-305 DRUM MACHINE ISSUE

Post by MacroDX » Mon Feb 03, 2020 8:30 am

I don´t have those schematics, but would also be interested because mine is completely dead currently.
My Modular Music is just Bleeps and Bloops!

soundcloud: http://www.soundcloud.com/macrodx
bandcamp: http://macrodx.bandcamp.com
vimeo: http://vimeo.com/macrodx

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wahee
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Re: VINTAGE sTIX st-305 DRUM MACHINE ISSUE

Post by wahee » Mon Feb 03, 2020 11:17 am

hi

I'm working on a YouTube video detailing my experiences with this machine. So I have managed to get somewhere with it but it's very hard with just the PCB and no schematic. Plus the board is full of bodges and mods, makes life difficult. I may put the video up as a part1 then a pt2 conclusion if I manage to get it fixed
Crystalline Stricture now on
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MacroDX
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Re: VINTAGE sTIX st-305 DRUM MACHINE ISSUE

Post by MacroDX » Mon Feb 03, 2020 1:28 pm

That´s good :tu: Anything that helps... After all not much info around about this item.
My Modular Music is just Bleeps and Bloops!

soundcloud: http://www.soundcloud.com/macrodx
bandcamp: http://macrodx.bandcamp.com
vimeo: http://vimeo.com/macrodx

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wahee
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Location: Belfast

Re: VINTAGE sTIX st-305 DRUM MACHINE ISSUE

Post by wahee » Thu Feb 06, 2020 5:59 am

yes just finishing it off and will post a link.

Turns out the TA75558 dual op amp is dead - hence the low volume.It's still too low though and noisey

It's tricky finding out where the voices all sum to go to the op amp with all the bodges on the PCB. All pat of the fun :party:
Crystalline Stricture now on
tonnrecordings.com

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