(Topic ID: 277366)

Bally Knockout - Questions of Double Bonus

By MattV

4 days ago

Topic Stats

  • 3 posts
  • 2 Pinsiders participating
  • Latest reply 2 days ago by MattV
  • Topic is favorited by 1 Pinsider


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1975 Knockout After 4 (resized).jpg
1975 Knockout After 3 (resized).jpg
1975 Knockout Before1 (resized).jpg
1975 Knockout Before (resized).jpg

#1 4 days ago

There is a lot of great data on these forums and I've been a "lurker" for a couple of years. I recently refinished a Bally Knockout (see before and after pictures below) that was pretty beat up. It required total painting on the outside and playfield as well as other internal repairs - but it's 100% working. It took a lot of time and effort and it was my first Bally (I've refinished a Williams Big Ben from scratch also).

But I have a question for fellow Knockout Owners.

When the double bonus is engaged and the ball lands in the advance bonus 3 hole, does the double bonus stay engaged throughout the ball cycle? On my machine it can easily disengage anytime that it goes through the twirly diamonds (not sure what they are called) or the center alley.


1975 Knockout Before (resized).jpg1975 Knockout Before1 (resized).jpg1975 Knockout After 3 (resized).jpg1975 Knockout After 4 (resized).jpg
#2 3 days ago

Hi Matt
welcome to pinside. Are the pictures in Your post-1 "before" and "after" ? If Yes: You did a great job.
The problem with "Double Bonus" - Unfortunatel ipdb does not have the schematics to Knockout - https://www.ipdb.org/machine.cgi?id=1392
I did a search here in pinside and found topics showing parts of the schematics
- here a good part from the beginning: https://pinside.com/pinball/forum/topic/bally-knockout-will-not-start#post-4218165 (readable to 13,14,15). Here https://pinside.com/pinball/forum/topic/1975-bally-knockout-relay-acting-like-stuck-switch-switch-not-stuck#post-5572298 the third picture is interesting - the guy encircled orange the "coil of Double Bonus Relay" - when the relay gets activated it pulls in and closes its Self-Hold-Switch (in the schematics called "Double Bonus Relay (switch)" AND switch on Bonus-Zero-Relay (closed when this relay is non-pulling) helps staying pulled-in. I take from this: "Double-Bonus-Relay stays pulling until the Bonus is counted down reaching Zero (which makes the Bonus-Zero-Relay to pull-in).
So You should inspect these two switches (Self-Hold-Switch*** on the Double-Bonus-Relay --- Switch on Bonus-Zero-Relay) (((and also check "Does the Bonus-Zero-Relay faulty pull-in))).
Self-Hold-Switch*** - such switches are easy to be found - a short wire runs from "solderlug on coil on relay" to "(Normally Open) Switch on the relay".

Well, other topics / posts I found (having snippets of the schematics):
https://pinside.com/pinball/forum/topic/bally-knockout-startup-#post-5093884 and https://pinside.com/pinball/forum/topic/bally-knockout-coin-door-help#post-616097 . Greetings Rolf

#3 2 days ago

Thanks Rolf - yes those are before and after pics of the Bally Knockout. A lot of cleaning, painting and fixing but the back glass was good and after much effort I got all of the mechanics working. I'm retired now and slowing gaining experience.

Taking a look to the Bonus 0 Relay and checking switches this AM. Will let you know what I find.

Thanks for your assistance.


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