Synth-DIY Yahoo! Groups Archives

Thread

Replacement transistors for Q1 and Q3

2010-02-16 by scituate_mass

Hello,

I'm new to the group here, as I just bought an EX-800. All was working well until my power supply decided to start outputting -15 V instead of -9V. Of course, I discovered this after the unit stopped turning on.

I think that I may have blown out Q1 and/or Q3... not really sure. If anyone knows of suitable replacements for these two transistors, please do let me know.

Otherwise... I'm very happy to be a part of this group!

Thanks - DT

Re:Replacement transistors for Q1 and Q3

2010-02-17 by Marcus Wilson

Hi There!

I have posted about suitable replacements for these two diodes, so the info is in the archives here,

it was about 2-3 years ago, so you will need to do some digging to find it, or use site search

if you ahve major hassles, i'll look for my records, but my friend.. the info is in them there archives!

JBFromOZ

Hello,

I'm new to the group here, as I just bought an EX-800. All was working well until my power supply decided to start outputting -15 V instead of -9V. Of course, I discovered this after the unit stopped turning on.

I think that I may have blown out Q1 and/or Q3... not really sure. If anyone knows of suitable replacements for these two transistors, please do let me know.

Otherwise... I'm very happy to be a part of this group!

Thanks - DT

Re:Replacement transistors for Q1 and Q3

2010-02-18 by Marcus Wilson

Here is the specific info on Q1 Q3 and Q18

> > > --- In korgpolyex@yahoogroups.com, Marcus Wilson <JB@> wrote:
> > > >
> > > > Q1 and Q3 can be replaced by:
> > > > BD140
> > > >
> > > > http://www.dse.com.au/cgi-bin/dse.storefront/
> > > > 4735dc390a33bb062740c0a87f9c06b4/Product/View/Z1444
> > > > .85c ea
> > > >
> > > > Q18 can be replaced by:
> > > > BD139
> > > >
> > > > http://www.dse.com.au/cgi-bin/dse.storefront/
> > > > 4735dc390a33bb062740c0a87f9c06b4/Product/View/Z1443
> > > > .85c ea
> > > >
> > > > just be sure to ensure they are in the right way around!
> > > >
> > > > I have had 3 polys with no powerup, and dirty looking transistors.
> > > >
> > > > By replacing these 3 transistors I have been able to resurrect 3
> > > > polys so far!
> > > >
> > > > this secret is now out, and good luck to all who wish to try to
> > > > repair a dead poly using this replacement method.
> > > >
> > > > Once these are replaced you should be able to see 11 P on the
> > display
> > > > of the poly, and re-load your patches.
> > > >
> > > > Best Regards,
> > > >
> > > > Marcus Wilson
> > > >

Re:Replacement transistors for Q1 and Q3

2010-12-25 by n8

What about something from radio shack? Like the 7805?

Sorry if this is a silly question...just curious.

I cant get +5V on ping 6 like i need.

seems like my measurements stop at the collector of Q1

Cheers,

Nate