(Topic ID: 212361)

Dracula driver board issues

By busa32927

2 years ago

Topic Stats

  • 12 posts
  • 4 Pinsiders participating
  • Latest reply 2 years ago by busa32927
  • Topic is favorited by 1 Pinsider


Linked Games

#1 2 years ago

The power driver board test point for the 50 volts test results is 75 volts. I assume there is something wrong but i have no idea on where to look.


#2 2 years ago

That's normal.

#3 2 years ago
Quoted from terryb:

That's normal.

As terryb said, it is normal. It's not under load when you test it.

LTG : )

#4 2 years ago

thanks guys. just trying to trace down probable causes for some switch issues. more post to come.

#5 2 years ago
Quoted from busa32927:

just trying to trace down probable causes for some switch issues.

Describe the switch issues you are having.

#6 2 years ago

at first it was a weird row 1 and row 2 error. I tested the main board and everything was good there. I narrowed it down to the 10 switch opto board. i pulled the cap and saw that it was leaking. Cap juice was also under the lm339. replaced both of those. row switch issues are gone. now i have 2 switch errors. Switch 51 and 71. I replaced the optos because i had them on hand. checked the voltages on the optos and they are correct and respond when an object is in its path. so i have no clue as to why the game isnt seeing those 2 switches as being closed. i am taking the 10 switch opto board to test on a friends dracula to see if its the board or if its something else in the game.

i already looked over the board for cold solder joints on header pins and other places.

#7 2 years ago

Sounds like you're taking the correct steps. What are the switch errors?

#8 2 years ago

switch 51 amd 71. i tried the 10 switch opto board in another dracula and it works perfectly. i have tested the cpu board with the row and column touching with the lead. all rows and columns light up as i touch them. i am at a total loss now.

#9 2 years ago

Does your BSD have a -1 Power/Driver Board with the flipper power relay?

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

#10 2 years ago

it has a rotten dog board

#11 2 years ago
Quoted from busa32927:

now i have 2 switch errors. Switch 51 and 71.

Are you getting error messages or they just don't work?

If you're getting an error message then do a factory reset. If they just don't work you've got a break in the row 1 chain. Check continuity from another switch on row 1 to the opto board.

#12 2 years ago

yep there was a bad hack job wire repair by previous owner. pulled out the repair and resoldered it and works now.

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