PSU shutdown

[Bulla]

Is it normal for the Ground to be connected to FG on a switching PSU ?

I’ve got a weird issue on a cab I’m trying to get going where as soon as I connect the Amp n Lock on the Goliath PSU to the Jamma harness the Switcher powers off. If I leave the Jamma unconnected, monitor and marquee light and switcher seem fine.

 

[big10p]

Not sure I understand. Is it a Hantarex PSU?

 

[Bulla]

Sorry bit garbled ! Suzo happ switching psu inside the Goliath PSU frame.

Everything appears to be fine until I connect the Goliath PSU frame to the Jamma harness. Once connected if I power on the switcher powers off after a second, assume some type of protection ? If I disconnect the Jamma harness then it doesn’t trip off. Only thing I noticed was the frame ground is looped to the ground on the psu and I wasn’t sure if this was part of the problem or not

 

[pooman2084]

Is there load on the loom? I had a pSu which would trip out if no board was plugged in.

 

[big10p]

Yeah, I was going to say it sounds like a shutdown due to no load, but it's odd it doesn't do it when you disconnect the loom. FG and ground on the switcher are sometimes tied together to eliminate video interference.

 

[pooman2084]

Mine would also trip if there was no 12v connected. I connected a small light bulb which solved it.

 

[Bulla]

Yep it’s got load, tried a different psu now too and same thing. I’m starting to think I may just rip out the old unigame/jamma wiring and start fresh.

 

[Bulla]

Cracked it ! Coin door wiring unplugged and first straight up !

 

[pooman2084]

Awesome!