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 Buck
Posts: 127
Joined: Sun Feb 26, 2017 10:59 pm
Location: Saguenay city, Quebec

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

Post by Laterreur »

Life is a big shcool in wich we are all sit and learn averyday :)
My games : Tales of the arabian nights, Monster Bash, Medieval Madness, Attack from Mars, Scared Stiff, Theatre of Magic
My EM Games: Sound Stage, Fire Queen, Jungle Queen, Fandango, Counterforce not EM but a junk.
Wanted games : Champion Pub, Junk Yard, Congo, No good Goofer, Monster Bash original restored.

User avatar
cap
MAACA Half-ling
Posts: 998
Joined: Wed Apr 05, 2017 8:19 pm
Location: Laval

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

Post by cap »

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 OG
Posts: 8597
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

Post by necro_nemesis »

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
Pins: Scared Stiff - Getaway - Funhouse - Twilightzone - No Fear - Attack from Mars - Indiana Jones - Cirqus Voltaire (prototype) - Medieval Madness - Tales of Arabian Nights. Arcades: Robotron (cocktail) - Stargate - Midway Haunted House. Jukes: Seeburg 100c - Seeburg 222.
Rumors of my demise have been greatly exaggerated.

Post Reply

Return to “Pinball and Videogame Tech”