Re: BU409

Well, first off - Boxing Bugs now works completely. I replaced the transistor
and up it came. No jiggly vectors or anything like that. It's almost like
saving a soul. Yeah, I'm not sure why they *all* were getting 24v. May have
been something internally shorted.

By the way, it sure would be nice to have a little get together (at least the
southern californians) and discuss techniques on fixing cinematronics cpu
boards. I have the Kurz Kasch exersizor and it even works fine with the HP sig.
analyzer - I still have problems finding the bad chips though. Anyone up for
that? anyone anyone? ...poke poke... Zonn? Paul O.? ...poke poke.

Matt

Rodger Boots wrote:

> Ignore that, it was a stupid question. (emitter doesn't GO to ground, does
> it?)
>
> Matt Rossiter wrote:
>
> > This should be a simple question. I'm fixing a monitor out of a boxing
> > bugs which uses the WG 19K6100 series monitor. I got the deflection
> > board working, but the HV is dead. My suspicion is that the BU409
> > transistor blew (as did some other components). Right now the
> > collector, base and emitter is reading 24 volts. Normally, only the
> > collector should be getting that reading the others should be getting
> > about 5-8 volts right?
> >
> > Anyway - the real question is, BU409 transistors are hard to come by and
> >
> > expensive. $5 a piece from Bob Roberts. However mouser sells the BU407
> >
> > transistors for super cheap and they've got plenty of them. I don't
> > have the specs, but I believe these are compatible - is that true?
> >
> > Thanks!
> >
> > Matt
> >
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> --
> Rodger Boots
> 400 Lindale Drive, Lot #34
> Marion, IA 52302-3084
> rlboots@cedar-rapids.net
>
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Received on Tue Nov 28 16:29:01 2000