Re: Good source for 2S* transistors

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Hi guys,

Thanks for the info. My NTE $4 comment is because I just tried to buy some
TL081 equivalents the other day. $0.45 from Jameco - $4.08 as an NTE part
from my only local electronics shop. Ouch!

It turns out the vertical hold pot was bad on my almost-working XY
board. I switched that over with another one this morning and could dial
in a vertically synchronized picture. I still had the horizontal waviness
(a hula as Randy Fromm puts it) and my 127v was up at 144v. I have a ton
of glue on the 127v pot adjustment that I haven't chiselled off yet. I
took the power board off and TR501 and TR502 tested out fine. Somehow in
the process of checking them (taking them off and putting them back), the
horizontal problem has gone away. It's a steady picture now. I haven't
checked the 127v since then though.

The only other problem I'm having is there's only the faintest bit of green
on the screen. I swapped in several interface boards without any change
and checked TR402 on the neckboard (in circuit). TR402 looks fine but I'll
probably swap it out and see if it's the culprit. There was no effect from
adjusting the green cutoff.

How can I tell if the green gun is dead? Can I measure resistances on the
neck board socket somehow?

Thanks again for your help.

-Werner

At 07:27 AM 9/27/2001 -0700, you wrote:
>Werner,
>
>What makes you think it's a 2SXXX? Did you ever use this monitor in this
>game? If not, the game may use a different sync hookup (+, - or
>composite). If it worked on this game before and you're sure it's wired
>correctly, and you're having trouble locking the sync you can adjust the
>choke on the XY pcb. It should act like a course sync adjustment. The
>+144 is too high. You should adjust the b+ closer to +130V. Let us know
>how you make out.
>
>-t-
>
>--- Werner Sharp <sharpw@bellsouth.net> wrote:
> > Hi everyone,
> >
> > I'm working on the WG4600 monitor and need to order a bunch of 2S*
> > transistors. Is there a particularly good source for these? I'm
> > hoping
> > to avoid the NTE equivalents at $4 a chip and instead get them at
> > something
> > more reasonable.
> >
> > The monitor I'm working had only 1/3 of the screen visible when I
> > started. I replaced both vertical deflection transistors on the XY
> > board
> > and I now have a full screen image. It rolls vertically though and has
> > a
> > slightly horizontal wave to it. It's not the sync signal or the
> > vertical
> > hold pot but something else going on. The 127v voltage is up at 144v or
> > so
> > but I don't know if that is a big problem. It has a new cap kit in it
> > so
> > all the caps should be go. I'm been through the troubleshooting
> > flowchart
> > and started going through the transistors one by one. If anyone has
> > any
> > good suggestions, I'd love to hear them. I think the problem is on the
> > XY
> > card but I'm not sure. I have four of them and this one worked the
> > best
> > of the bunch. I've also swapped in 4 different video interface cards
> > with
> > no effect.
> >
> > Thanks for any info.
> >
> > Werner Sharp
> > sharpw@bellsouth.net
> >
> >
> >
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Received on Thu Sep 27 10:38:13 2001