(Topic ID: 151830)

Haunted House Switch Weirdness

By marl3y

5 years ago



Topic Stats

  • 9 posts
  • 3 Pinsiders participating
  • Latest reply 5 years ago by OzPaul
  • Topic is favorited by 1 Pinsider

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#1 5 years ago

My Haunted House can't seem to figure out where the ball is. Plays the wrong music on each of the three playfields, "drain ball" sounds when hitting targets... I suspected a switch problem, so I went through and tested each individually in the test menu. Incidentally I have a Ni-Wumpf board installed and for a couple I got a "Clean Switch" error. According to the manual this happens when more than one switch closes in a very short time frame. So with a contact cleaner I went though each and made sure the spacing was correct. This didn't solve the problem. Having recently experienced the problems bad or missing diodes can cause I decided to check each of the switch diodes. To my surprise I found three of them tested bad. They are associated with switches 00, 22 and 40, so across various rows and columns. This may sound like a crazy question, but is it plausible that all are in fact bad or could something else be causing them to test bad? Replacing them is easy, but I was surprised to find multiple testing bad. Thanks.

#2 5 years ago

Gottlieb used 1N270 diodes in the switch matrix.
They will test differently than the typical 1N4004 diodes.
Are you taking that into account?

I agree with your diagnosis. Wrong sound sets is generally caused by the game not knowing where the ball is.
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact/
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#3 5 years ago

Yeah, they all tested something like 0.270 or so in one orientation, but three of them tested 2.2 in the reverse instead of 0. Just seems weird to have so many test bad. Was gonna replace with 1N4148 unless that's a bad idea. The 1N270 germanium are not easy to find, and pricey.

#4 5 years ago
Quoted from marl3y:

The 1N270 germanium are not easy to find, and pricey.

Yes they are.
I've scrounged some from unused coin drop switches in the past.
Or, swap 1N4004s in for the coin drop diodes then use the 1N270 coin drop diodes for PF switches.
That's probably being over sensitive. I've seen 1N4004s used and the switch works perfectly.
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact/
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#5 5 years ago

Thanks Chris, I think I'll canibalize the coin door switch diodes like you suggest.

#6 5 years ago

Not so fast. Thinking I needed three 1N270 diodes for the playfield switches I replaced three of the coin door switch diodes with 1N4004s. To make it easier to get to them I disconnected and removed the lower playfield. I had two 1N270s to replace on the lower playfiled, so I decided to try to take care of those while I had it out of the machine. Of course now when I test the diodes they are all good. The other "bad" diode was on the upper playfield, it still tested bad, that is in until I disconnected it from the wiring harness. So, disconnecting A1 P/J5 from the upper playfield and A9 P/J2 from the lower playfields results in all the previously "bad" diodes all testing now as good. Any ideas what could be going on here? Thanks again.

#7 5 years ago
Quoted from marl3y:

Any ideas what could be going on here?

"In circuit" readings sometimes yield false values as the meter is really reading something other than the device thought to be tested. Sneak circuits. Generally, it's suggested that one leg of the diode be lifted for testing.
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact/
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#8 5 years ago

Got it, but there's still got to be a problem someplace, right? I shouldn't be reading voltage in the wrong orientation, even in circuit. Maybe a board problem. I'll need to see what's on the other end of those connectors. Thoughts?

1 week later
#9 5 years ago

Hi. I'm new to Pinside, just joined today. I'm currently restoring a Haunted House and a Volcano here in Australia, so currently loving system 80’s. A Spirit would really complete the line-up.

Could this be a S16 line issue? I was getting confused chasing switch/diode readings and then took a different approach and concentrated on the very confusing S16 design.

I was experiencing the exact same issue on my HH, with wrong sounds on all playfields and I recall the pop bumpers were also playing ‘drain ball’ sounds.

I followed a good S16 path from the control and driver boards, eliminating wiring and connectors along the way and found that it was my sound board at fault!

U24 on the sound board is a dual comparator IC (LM193 lamp driver interface on schematic) and following Clay’s guides, found that putting a logic probe on pin 7 of U24 I had no pulse changing from high to low, whilst dropping ‘Cellar’ drop targets for a trigger pulse.

Removed and socketed a new LM393 in place and all my ‘Haunted’ sounds are now, back to normal.

Sorry if this doesn't help resolve you’re HH problem, but might help others with Gottlieb sound/speech boards playing incorrect sounds.

U24_(resized).jpg

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