HELP GND short row 1 is stuck closed Road Show

Have questions on how to fix your machine or what products to use? This is the place to ask for help.
Laterreur
MAACA Collaborator
Posts: 110
Joined: Sun Feb 26, 2017 10:59 pm
Location: Saguenay city, Quebec

Re: HELP GND short row 1 is stuck closed Road Show

Postby Laterreur » Thu Dec 28, 2017 3:31 pm

Life is a big shcool in wich we are all sit and learn averyday :)
My games : Tales of the arabian nights, Adams family, Fish Tale, Getaway, Road Show, The Shadow, Gorgar
Wanted games : White Water, Open to offers if its Williams/Bally DMD.

User avatar
cap
MAACA Barbarian
Posts: 700
Joined: Wed Apr 05, 2017 8:19 pm
Location: Laval

Re: HELP GND short row 1 is stuck closed Road Show

Postby cap » Thu Dec 28, 2017 3:42 pm

Baptism by fire is the fastest way to learn because you really need that knowledge to get the job done.
I cursed at all the problems I got with my Stargate but I learned a lot and it actually plays nice now after all the time I put into it.
Road Show, Last Action Hero, Rocky & Bullwinkle, Stargate, F14 Tomcat (in restoration)

User avatar
necro_nemesis
MAACA Immortal
Posts: 8545
Joined: Wed Nov 18, 2009 10:32 pm
Location: Within mechanism_8 or simply Newmarket

Re: HELP GND short row 1 is stuck closed Road Show

Postby necro_nemesis » Wed Jan 17, 2018 10:05 pm

If a particular row does not display as closed, or is closed without any test lead connection, replace its corresponding LM339 chip on the CPU board. Here are the switch rows and which LM339 controls them:

Rows 1,2,3,4 = U18
Rows 5,6,7,8 = U19
Rumors of my demise have been greatly exaggerated.



Return to “Pinball and Videogame Tech”

Who is online

Users browsing this forum: No registered users and 1 guest