(Topic ID: 229212)

Black Knight burns through batteries


By BShing

11 months ago



Topic Stats

  • 3 posts
  • 3 Pinsiders participating
  • Latest reply 11 months ago by Schwaggs
  • No one calls this topic a favorite

You

Linked Games

#1 11 months ago

I have a 1980 Black Knight that has always gone through batteries extremely fast. A good set of AA’s last about two weeks. I just recently changed the 5101 thinking the memory chip itself was doing it and no luck. The new (well replacement, I stole it from a spare Firepower board) chip didn’t solve the problem. Any ideas? I almost bought the battery replacement chip but thought that might not work until I resolve what’s doing this.

#2 11 months ago

I’m sure it’s one of the 2 diodes right by the battery back.
One of them is shorted.
Letting the power back into the battery pack making th batteries drain faster.

#3 11 months ago

According to the scematic, IC10 is also powered by the battery pack circuit. A failing chip here could also be the problem.

If you ever want to go to NVRAM, I would just replace the 5101 with an NVRAM module. Whatever is draining the batteries, is very unlikely to cause problems with the NVRAM.

Promoted items from the Pinside Marketplace
$ 117.00
Playfield - Toys/Add-ons
The MOD Couple
$ 5,799.00
Pinball Machine
Operation Pinball
2,400
Machine - For Sale
Concord, MA
$ 50.00

Hey there! Got a moment?

Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside