Gottlieb Sys 80 transistor question

[Steve Schukei]

Going through my first Gottlieb system 80 game, Counterforce; and I am
enjoying it. I have done the marvin3m.com upgrades and the pin is now back
to life with one exception. Both drop target reset solenoids are stuck on.
I checked the switches and they are OK. I am assuming there is a bad driver
transitor. Clay's site says, and on my game there are three 2N3055
transitors. But on my driver board one was replaced with a Motorola 464R01
8052, or so the transistor is identified, and that is one of the transitors
that triggers one of the reset solenoids. This motorola transistor is not
listed on Clay's site as a substitue and I have not yet checked the
transitors with a DMM. Any comments.
Thanks in advance
Steve Schukei CARGBP 24

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

[Rockola]

Those are also predriven by an mps U45. Check all transistors involved
with the solenoids that are locked on, also check the diode and the
solenoid itself. If either of those are shorted the coil will lock on
as well. You can get a 3055 at radio shack, if you need a mps U45 you
can move Q54, 55, or 56 to the location needed (their not used in that
game at that location). There are alot of different substitutes for a
3055.

zTim

zTim

[Ray Johnson - Action Pinball]

Can't hurt to do a quick check to see if the transistor looks shorted.
And/or pop it off the board and test out of circuit if it's not obviously
bad in-circuit.

You can use NTE130 as a substitute if you have a NTE/EKG dealer locally.

Here are some other compatible crosses from my handy dandy transistor
substitution book (copyright 1970 Hayden press):

2N1556, 2N1560A, 2N1560, 2N459A, 2N677B, 2N677C, 2N6788, 2N678C

Fortunately the 2N3055 is one of the few parts Gottlieb used that is easy to
find a replacement for... ;)

Good luck!

Ray J.
--
Action Pinball & Amusement, LLC
Salt Lake City, Utah USA
Web: www.actionpinball.com

We're serious about pinball. Anything else is just for fun!

"Steve Schukei" <Iapi...@hotmail.com> wrote in message
news:42c09990$1...@spool9-east.superfeed.net...