System 80: reset after pressing replay button

[Ralf Thelen]

Hi,
I have a problem with my Gottlieb Panthera. After switching
the game on everything seem's to be OK (Display, attrack mode, ...),
but after pressing the replay button the game immedietly makes a
reset!
I pulled A3-J4, pressed replay (no reset!) and attach A3-J4 again.
With this I noticed the reset is every time the outhole,one of the
drop target banks or a kicking rubber is energized.
I made the ground mods, swapped the orange filter cap and test the
game
with different (working) power supply, CPU and driver boards,
nothing helps :-((

BUT: If the game is on for appr. 10 minutes, everything works fine!
No resets! any hints?

thanks
Ralf

[John Robertson]

Whose ground mods did you do? Mine or the other ones? This sounds like
a ground issue to me...or a missing/open diode on a bank reset coil.

John :-#)#
www.flippers.com/got-tips.html

On 29 Oct 2004 09:17:36 -0700, ralf....@online.de (Ralf Thelen)
wrote:

(Please post followups or tech enquires to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

[MitchelWB]

My Black Hole was doing exactly what you're describing recently... Here's
the thread:
http://groups.google.com/groups?hl=en&lr=&c2coff=1&threadm=cfkvn0plmgjfopgk2
9qa8l9g1p97dco4ch%404ax.com&prev=/groups%3Fnum%3D25%26hl%3Den%26lr%3D%26grou
p%3Drec.games.pinball%26c2coff%3D1%26start%3D200

or

http://tinyurl.com/3qqtm

MitchelWB

"Ralf Thelen" <ralf....@online.de> wrote in message
news:74a91825.04102...@posting.google.com...

[CHibler]

I had the same problem with my Spiderman, even after I replaced the big cap.
It's important that the replacement cap is the same as spec'd for the game
(or at least close). Great Plains Electronics is where I got my replacement
cap.

The other problem was that a prior owner/operator had soldered the diode on
one of the drop target reset coils backwards. I should have checked those
out first, but it didn't even occur to me that someone could do that.

I reversed (replaced it too just for good measure) the diode, and all was
well.

Good luck with yours. Let us know how it turns out.
--
Chris Hibler
chibler@-NOSPAM-charter.net (munged)
Twi*light Zone, Ge*nie, Spider*man, and a bunch of EMs
http://webpages.charter.net/chibler/Pinball/index.htm

"Ralf Thelen" <ralf....@online.de> wrote in message
news:74a91825.04102...@posting.google.com...

[Ralf Thelen]

I did all sys80-ground mods on your side
(including the extry wire to the cabinet)
and checked the diodes at the coils.

I agree that it must something with the grounding:
I desoldered the five coils at A3-J4 and the problem
is still there (only ground cables left at A43-J4).
I isolated pin10 (Ground for SOL.2 ) and the game comes up
even with a plugged A3-J4, but after I solder SOL.6 again,
the game resets when fire SOL.6.

I don't know what to do next :-((

John Robertson <sp...@flippers.com> wrote in message news:<ql65o0dd36q9bnmkg...@4ax.com>...

[Ralf Thelen]

Panthera is running again :-))
Found this with my good old oscilloscope which points
me to a missing half cycle in the 12V to the power board.
Reason was one broken diode in the 12V bridge rectifier.
So the rectifier gave enough power for the power board to produce 5V,
but obviously with problems to clear the peaks produced by the coils.

thanks to all ...
Ralf

ralf....@online.de (Ralf Thelen) wrote in
news:74a91825.04102...@posting.google.com:

[John Robertson]

This problem should have shown up as AC ripple on your primary filter
capacitor. That's why the techs all recommend you check both AC and DC
voltages on the filter caps. AC is normally under 0.300VAC on +5
supply filter capacitors. I bet yours was something like 1 - 3VAC!

John :-#)#

(Please post followups or tech enquires to the newsgroup)