What's new
Pinball info

Register a free account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!

WPC switch column issue

Banzaipinabll

Site Supporter
Joined
Aug 16, 2011
Messages
854
Location
Aberdeen
Alias
Mike
Being a bit lazy, hope someone can help without me doing to much digging.

WPC CPU, one switch column is out, checked and know its a cpu issue. Changed U20 IC and same issue remains.

Idea quick idea's before I dig into fault finding
 
Got a column of switches not working, pin 6 on J207. Have confirmed issue is on the board.
Changed U20 and U14, no change
Logic probe all the areas as detailed on pinball wiki.
When logic probe I get a high reading on all the pins including pin 6. However pin 6 gives a solid tone, the other give the same tone, but the tone is pulsing. Is the difference an issue, I get the same tone difference at U20

Any help please
 
Have you tried pushing in the asic?

Reseated the socketed ROM chips?

Have you other chips to try in U20, U14? it is possible that the replacements are duff...
 
Back
Top Bottom