Josh,

Try the yahoo group tekscope. As for the attenuation I believe it is a bad =
component. Try to search for it. I believe it cause by a component under st=
ress. Use a heat gun and focus the heat around. If the signal goes low chec=
k the component affected by heat.


John



--- On Fri, 1/21/11, Josh Koffman <joshybear@gmail.com> wrote:

> From: Josh Koffman <joshybear@gmail.com>
> Subject: Re: [EE] Help with malfunctioning function generator
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> Date: Friday, January 21, 2011, 9:50 AM
> On Thu, Jan 20, 2011 at 2:22 AM,
> Richard Prosser <rhprosser@gmail.com>
> wrote:
> > Look at the electrolytics. any that are at all swollen
> need to be
> > replaced. Same with any that appear to have popped
> their bases out. If
> > they all look ok then replace the ones on the 15V line
> anyway.
>=20
> That was the first thing I looked at, and to be honest, I'm
> surprised
> at how immaculate everything looks. There isn't even much
> dust inside
> (not that there are vents the dust could get sucked in).
>=20
> > Also check the 7815. If it's getting hot then
> something is drawing
> > excess current orse the 7815 itself may be faulty - or
> it's input
> > voltage is dropping.
>=20
> It's getting warm, and something is definitely drawing
> excess current.
> Thing is, it wasn't doing that until I started probing
> around. Could
> be coincidence, but I'm not convinced.
>=20
> > Also, if anything else seems to be getting hot it
> could be worth a closer look,
>=20
> I can't seem to find much else getting warm at this point.
>=20
> > A schematic would be of great assistance, but they can
> be hard to find.
> >
> > hope this helps.
>=20
> A schematic would be a lifesaver at this point. Seems
> unlikely though.
> I'll give it another couple of stabs before I give up, but
> I really
> feel like I'm working in the dark on this one.
>=20
> Thanks!
>=20
> Josh
> --=20
> A common mistake that people make when trying to design
> something
> completely foolproof is to underestimate the ingenuity of
> complete
> fools.
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>=20
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>=20


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