Jump Bug Restoration gone AWRY

[randywhatson]

Hey guys...

I am restoring a Jump bug that was converted to Mr. Do!

Everything was finished, except I didn't have a Jump Bug PCB.

Well, I finally bought one. It came with an edge connector that also connected to a Jamma Harness.

So I had two options.

Re-wire the Cabinet to OG jump bug... or re-wire with a Jamma harness.

I opted for Jamma. It seemed easier.

So I took a jamma harness, wired up the essentials (+5, ground, +12, -5) and re-wired the control panel.

Sent the wires to the monitor.

There were a few connectors that didn't go to anything.

I turned it on and have a super-blurry... and very unstable looking picture on the screen.

I can see the twinkling "stars" of the background, but the main image is severly distorted.

It looks like a sync. issue, only its not scrolling.

Is there something I should have hooked up, but didn't?

I thought it was a monitor/picture image... so I tweaked a bit with the red, green, blue and sync wires. Nothing. Also, the cabinet I stole the jamma harness from had the same monitor. A k6100.

What could I be missing? What needs to be wired in to make a Jamma harness work?

Like I said, there were some connections that I didn't hook up. Seemed like coin door stuff... nothing important.

What should I try next?

[John's Arcade]

Where did you get the Jump Bug pinout?

[randywhatson]

Didn't need one. The pcb came with an edge connector... and then it connected to jamma ( I bought it from Eldorado games and it was something he created).

I hooked it up in my Jamma cabinet and it played.

I removed the whole Jamma harness from that cabinet... hooked up the red/black/orange to the +5. +12 and ground of the switcher... plugged in the connectors to the monitor (both k4600... not k6100) and plugged in the molex for the controls.

And I got weird, wavy, distorted image on the monitor.

Some dude mentioned pin 14... a ground... that I didn't hook up.

I'll try that when I get home.

[John's Arcade]

Make sure the JAMMA adapter is wired correctly. The pinout that is floating around is WRONG.

https://forums.arcade-museum.com/showpost.php?p=2732673&postcount=11

[randywhatson]

see the thread about the k4600.

I was confused because it worked just fine running Mr. Do!.

But not Jump bug.

Here is what Bob Roberts said: "The screen has horizontal bans of color like a barber pole or maybe almost straightened up, but not quite, so that the picture is slanted. Some pcbs may work fine, while others don't."

[Tighe]

Phetishboy had me make an adapter for his jump bug and his had a similar issue, he sent it out for repair, I forget who he sent it to i believe he mentioned it in the podcast

https://youtu.be/sFaK0N_7y3M

[randywhatson]

It's fixed. It was the horozontal adjustment know (or was it vertical??).

Anyway, it was the k4600 not the PCB or my hack wiring job.