(Topic ID: 120799)

DE Simpsons display issue - segment stuck on

By bestofthebunch

9 years ago


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  • 11 posts
  • 3 Pinsiders participating
  • Latest reply 9 years ago by barakandl
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#2 9 years ago

Could be a few things.
Connector
Resistor SIP
6821 at position 9B

Which segment is it?
Do you have a logic probe?

DE display segment lettersDE display segment letters
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#4 9 years ago

Strange...since the G segment is driven by separate logic on each tube, which would seem to require two separate failures.

http://www.pinwiki.com/wiki/index.php?title=Data_East/Sega#Alphanumeric_Issues

--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#8 9 years ago

Well...with a RD board in there...I'm out of the game.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://ww.PinWiki.com - The Place to go for Pinball Repair Info

#10 9 years ago

I had considered that, but the circuitry on the board =should= have separate enables for that segment. i.e...there are different ICs responsible for segment G on the upper glass and on the lower glass.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

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