Re: fixing a newer g-05

 On the question of transistors, I am unsure what everyone means when they
say they "test" them. I am guessing that (like myself) this is simply a
check with a digital meter to make sure some the BE and BC junctions are
ok.... that it conducts when the right bias is applied to it.

 In the case of these big transistors for the monitors, simple tests like
this may not do the trick (as you guys have seen). Similarly
some power supplies test ok without load, but then when you hook them
up... nada (I'm sure you guys have seen regulator circuits like this).
The transistor's characteristics may have changed over time and from heavy
usage, spikes, etc.

 I don't think it would be too hard to set up a decent test circuit for
these... with the correct bias, a load, etc... but the quickest method is
to just swap in new parts... if there is interest I could come up with
something for testing...

                                        mitch
 

On Wed, 28 Jan 1998, Mit Matelske wrote:

> At 05:10 PM 1/28/98 GMT, you wrote:
> >I had some asteroids machines that had simular problems and all the
> >transistors tested OK, but when I replaced them, it fixed the problem.
> >
> >-jeff
> >
>
> This brings to mind a question I've been meaning to bring up for awhile.
> I've come across quite a few transistors that tested OK, but just would
> not work in my Wells. I believe I have the same problem in one of my
> G-08's right now and was wondering if someone could explain to me how
> exactly to be sure that a transistor is good enough to use.
>
> Thanks,
>
> Mit
>
Received on Wed Jan 28 16:09:58 1998