(Topic ID: 74617)

Tech: Williams Sys 7 Displays

By drscottsmith

10 years ago



Topic Stats

  • 4 posts
  • 4 Pinsiders participating
  • Latest reply 10 years ago by j_m_
  • No one calls this topic a favorite

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#1 10 years ago

Ok guys -

I have read and searched and have TMI overload right now...let me describe the issues. Game is Black Knight.

Player 1, Player 2 and the credit/match display are fine.

For Player Three: The last digit is out completely , and segments 'a' and 'b' are out on every other character.

For Player Four: The first digit is out completely, and segments 'f' and 'g' are out on every other digit.

So...I think I am right in assuming all of the resistors on the master driver are good, since in some combination, for players 3 and 4 all of the segments are accounted for.

Also, I think I am good in assuming that the data lines from the MPU are good, or I would see nothing.

So If I am right, then I am stuck and can't find what to troubleshoot next...any ideas?

Thanks -

-scott

#2 10 years ago

Easy first step is to swap p3/p4 and see what happens

#3 10 years ago

After that, if problem does not move swap the cables.

#4 10 years ago

if you do what GListOverflow and Patofnaud suggest and it turns out that your display driver board is the culprit and you have no way to fix it, pinballpcb.com offers a discrete component version of the board which work well for $75. they also sell the cables individually and in a complete set

http://pinballpcb.com/System7DisplayDriver.html

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