New! Dark mode!

Browsing Pinside at night? Getting tired of all the white? Switch to dark mode using the button in the top right (or CTRL-B)!

(Topic ID: 272079)

Missing 20v - Creature From The Black Lagoon


By at1105

5 months ago



Topic Stats

  • 8 posts
  • 3 Pinsiders participating
  • Latest reply 5 months ago by Ronkz650
  • No one calls this topic a favorite

You

Linked Games

You're currently viewing posts by Pinsider at1105.
Click here to go back to viewing the entire thread.

#1 5 months ago

I recently got a CFTBL and noticed the flashers weren’t working. It has a Rotten dog driver board and cpu board. Opened the head and noticed the 20v LED isn’t lit. I have checked the fuses and they are all good. The interlock switch is good but strangely doesn’t have any effect when opened. The voltages at J102 connector are

When plugged in
Pins 1&2 - <1 VAC
Pins 3&4 - 16.6 VAC

When NOT plugged in
Pins 1&2 - 11 VAC
Pins 3&4 - 5 VAC

Not sure where to go from here. Any ideas?

#3 5 months ago
Quoted from ChrisHibler:

Plug J102 back in.
Power on.
Measure AC voltage between J102 pins 1 and 4.
It should be about 18VAC.
Report back.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact ... for board repairs
http://www.PinWiki.com - The Place to go for Pinball Repair Info

Between pins 1 & 4 measures 17 VAC

#5 5 months ago
Quoted from ChrisHibler:

That's good. That is what it should be.
Remove and "buzz" F111 to ensure that fuse is good.
After that, next step is to test BR4.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact ... for board repairs
http://www.PinWiki.com - The Place to go for Pinball Repair Info

Fuse tested good. I couldn’t locate BR4. This Rottendog board doesn’t seem to have one.

#7 5 months ago
Quoted from ChrisHibler:

Oh. Forgot it was a RD.
Follow the trace from F111 to a pair of large diodes. Those two diodes will also connect to two other diodes. Test all four of those diodes.

Chris Hibler - CARGPB #31
Http://chrishiblerpinball.com/contact
http://www.PinWiki.com/ - The new place for pinball repair info

It’s fixed! I checked those diodes and they tested good so I went back and pulled the fuse again and it tested bad this time! Strangely it tested good the first time. Not sure how. So I replaced the fuse and the 20v is back.

Thanks for your help!

Promoted items from the Pinside Marketplace
$ 499.95
Lighting - Led
Pin Stadium Pinball Mods

You're currently viewing posts by Pinsider at1105.
Click here to go back to viewing the entire thread.

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