Wire for Jamma - no video

jonathan1138

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Hello all. Recently obtained a cabaret that was a good candidate for JAMMA.

Bought an AC Wiring kit, DC wiring kit from Bob Roberts (great products / excellent resource) and a 465 in 1 babystar board (vertical monitor cab).

Took out all the wiring (it had seen better days), Wired up the AC / DC - before hitting the JAMMA connections. Monitor powers on, Marquee lights up, Power is there, lED on power switcher (holds 5v and 12v) activates. Good first step.

Next, wire up for JAMMA. Run all the pipes, and connect only Video and the Babystar 465 in 1 board. Want to verify that i get a picture. Leave Coin door / speaker / control panel for later.

Fire it all up... Babystar whirs, seems like its working. Monitor activates, but no picture. Kept it running for ten minutes, still nothing.

More details - the monitor is an Orion - made in 2002 (i can get model number if it helps).

The monitor is on (i adjust pots for brightness, see grey screen) but no video from the multi board.

Check the Red / Green / White / Black (ground) / Blue connections (needed to connect these up to the JAMMA) - seems tight / connected (used the crimp on connectors to join these).

12 volts is hooked up at the power block (switcher - Happ / Sanwa model - black) to the JAMMA harness which connects to Multi board.
Also, something i find strange - but i did it anyway - JAMMA harness has 4 wires (keys) for 5 volts (that is the JAMMA standare). Yet the power switcher has one slot for 5 volts. Connected the 4 JAMMA connections over to the slot for 5v. Felt like i was cramming them in, but they fit under that tiny screw.

For this newbie, who is eager to get DK and the other folks up and running, what is a good start for troubleshooting? I guess to summarize - no video at all from multi JAMMA board on new cab wire up. Unfortunately, i have no other Jamma boards for now to test against...

Thanks in advance for help on this....
 
Well, if you have another game to connect to the monitor for testing, then you can be sure the monitor isn't the problem.

As for the video - I would guess the problem is with the video grounding. You would normally connect the video ground to the JAMMA video ground wire on pin 14. Some people make the mistake of hooking it up to one of the normal ground wires, and sometimes that works and sometimes it doesn't. Also, I've seen boards and JAMMA adapters that don't connect Pin 14 to ground on the board, and you have to jumper it to the normal ground to get the video to work....
 
You put me on a good lead here - Checking the mfrs. pinout, Pin 14 is NC... I will cut that connection and hook that up to "Normal Ground".

Will let you know if this changes anything. Thanks.
 
ok - Connected Both ground from monitor and ground from JAMMA harness to the leg of AC Filter (Ground). They were wired together before.

Now, I get Green colors only, wavy green lines, constantly flailing (top to bottom). I tried monitor adjustments but this does not affect the picture. Also, if i put my hand on the monitor screen the picture goes away. I can barely make out text - so i know some signal is being received.

Hmmm.....wonder if its in some kind of VGA mode (is VGA that old looking green colors - cuz thats what it looks like)
 
RetroHacker,

Meaning that I shouldnt be connecting the Monitor Ground leg (coming off the monitor) to the AC filter leg - ok......

I disconnected that and put it into the Switching Power supply Ground. I left the JAMMA Ground at 14 disconnected.

Still same issue. Green only and rapidly wavy lines....

Any other leads please!
 
Clarity - Monitor has a ground that goes to the chasis / connected to AC Filter leg.

Monitor also has Molex with Red, Green, Blue, Yellow, BLack and White. Yellow is disconnected. Red, Green, Blue and White are all connected to Jamma harness. Black is now connected to the Power Switch block.


Is that correct?
 
Monitor ground needs to be connected to AC ground at the distribution block (i.e. the metal frame of the monitor goes to the AC ground).

The *signal* ground on the video connector needs to go to Jamma DC ground. So the black wire from your video connector should not be connected to the AC distribution block - hook it up to the Jamma ground.

-Ian
 
Got it. Good progress - I have green / No more waves!

I will now put back the other colors to make sure all is working.

As expected though, darned image is upside down. I hear this is a problem with these 465 in 1 board - now i have to mess with the Yoke i guess. More to follow and thanks (one problem down, more to go).
 
Ok - Closure.

Ground is now connected and getting all colors / monitor works. The babystar needs to have the Yokes reversed on the monitor (the darned game displays upside down). Completed that. Everything works now.

Thanks KLOV!
 
woa hold up make shure that there isnot a setting somewhere to flip the monitor on that multi board before you flip the yoke almost every multi i have dealt with and even most newer jamma boards have a option to flip the screen
 
woa hold up make shure that there isnot a setting somewhere to flip the monitor on that multi board before you flip the yoke almost every multi i have dealt with and even most newer jamma boards have a option to flip the screen

i checked the manual for this when he first mentioned it being upside down, and while there is a way to go into the soft dips for a SINGLE GAME and choose FLIP SCREEN, not all games may have it. Didn't see any universal settings that will do it...
 
I looked in the manual myself and from what. I can tell it really is just mame in a box if entering the setup brings him to the black box for mame setings he can just go t vid settings and there should be a option t set output

Also if not should h not just flip the yoke wires and not rotate the whole yoke. What a pain n the ass lol now I know why I'd rather build my own mame machine than screw with these cheap jap k ockoffs

srry typing this on my cell can't get net in my workshop
 
Hi - No way to flip it. Needed to change the Yoke (and did). Simple - clip the connector and reverse the plugs (according to the Venerable Bob Roberts tutorial). Took me about ten minutes (less).

Everything works now. The 465 in 1 is ok - some games, like DK and DK JR are missing sound samples and the audio volume is VERY flaky (the pot to control volume is flimsy and annoying).

Its for the kids, they are loving it. All of my other games stay dedicated.

Thanks.
 
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