RE: Monitor Problem

You can't swap a 2N3716 with a 2N3792 and vise-versa. One is a pnp
transistor and the other is an npn. Whats important is what wires are going
to the transistor, regardless of where they are physically located on the
chassis (they can be easily be moved).

From Gregg's FAQ:
An easy way to remember which kind of transistor goes where is to know
that each connector has one of each kind; the 2N3716s are on pins 1, 3,
and 4 (key at pin 2) and the 2N3792s are on pins 5, 6, and 7. If the
wiring has not been altered, all 2N3716s are connected to the yellow,
green, and red wires and all 2N3792s are connected to the purple, blue,
and white wires.

-jeff

-----Original Message-----
From: David Rudich [mailto:redolphn@tidalwave.net]
Sent: Wednesday, August 04, 1999 2:01 PM
To: vectorlist@lists.cc.utexas.edu
Subject: Monitor Problem

A few days ago I was playing my Star Wars with the Wells Gardner 6100
monitor in it and the monitor shut off. I decided to install the LV2000
that I had bought and still no monitor but R920 on the HC board blew. I
replaced R920 then I realized as I was checking over everything that P101
was off one to the left(or one up). So then, I read the Gregg Woodcock
document and in there it said I now had to change Q703, D702 and R711. I
changed all of these and still no picture. After talking to Jeff (thanks
for your help!!) we found out that I needed to change the chassis
transistors that went with P100. I changed those two and the screen finally
came on. The only problem was that all the lines were shaking up and down.
Then I changed the two on the side of the chassis and I still got the same
thing. So now I decided to just change the rest of them and see what
happens. Well I noticed that on the monitor chasis the transistor that is
in the middle bottom (I think Q102) was a 2N3792 and I thought it was
supposed to be a 2N3716 from what I have read. Also I think Q706 which
should have been a SN3792 orignally had a 2N3716 in there. So I changed the
2N3792(Q102) to a new 2N3716 that came with my cap kit. Now when I turned
it on everything was crystal clear and all the lines were great, but the
whole screen was squished up to the top part of the screen and the bottom
was just all black. So now I decided to change Q706(With the correct one
that it says should be in the manual) and Q705 now with new ones and I got
the same thing just picture on the top. This next thing I regret doing
since there was a 2N3792 in Q102 originally and and a 2N3716 in Q706
originally and tried going back to that. Well I turned in on and I got a
spark which looked like it came over from the deflection area. I turned it
off immediately and went back to the way it says in the manual and now when
I turned it on in the middle left of the screen there are about 3 short
lines and it looks like the whole screen is squished into these couple of
short lines. The short lines don't even go half way to the screen. I am
sorry for this being so long, but if someone could please help me out that
would be great. Thank you very much.

David Rudich
reddolphin@home
410-356-4441
Received on Wed Aug 4 15:25:42 1999