Raiden 2 (II) video sync screwy?

boogiemanspud

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I got a Raiden 2 PCB recently and hooked it up in my arcade cabinet. It displays but it is like the sync is totally messed up. Any ideas what would cause this? Does Raiden II have some strange settings or such?

Thanks for the help, I am throughly confused.
 
It's a sega new astro city cab, so not sure what it was made for.

I have used an arcadevga on it and also a viper phase 1 pcb, all work.

I will dig into the horizontal and vertical holds, hopefully I can find a manual for the cabinet. Everything else I have tried just worked.

EDIT: I can't find any info on where vert and horizontal sync are on the chassis.
 
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Missing video ground can give a fault that looks like bad sync, if you really have bad sync its likely you wont be able to make out anything from the image, if you have missing video ground you will get a recognisable (in parts) screen but it will be all torn up.

Some cabs are wired with video ground connected to the board "common" ground, others don't, some boards make the assumption that vid ground is common ground, if you have a mismatch you could well be missing video ground entirely.
 
Missing video ground can give a fault that looks like bad sync, if you really have bad sync its likely you wont be able to make out anything from the image, if you have missing video ground you will get a recognisable (in parts) screen but it will be all torn up.

Some cabs are wired with video ground connected to the board "common" ground, others don't, some boards make the assumption that vid ground is common ground, if you have a mismatch you could well be missing video ground entirely.

That sounds like that may be whats going on. I tried the board in my other cab with misc. guts in it and it worked, so the board is good. With other boards the astro city cabinet is fine.

The image is discernable, but its torn like you are saying, kind of like its shaking from side to side all over the whole screen. Sometimes, like when on certain parts in attract mode it will clear up a little (still all garbled though).

So is there a logical way of telling about the video ground? Do I need to make an adapter? Is it about tracing wires? I guess I am just not sure how to proceed.
 
I got this fixed, just in case anyone has a similar issue, I'll post what worked.

It was the video ground. Apparently a Sega New Astro City cabinet uses a separate video ground.

So what I did was this:

Printed out a JAMMA pinout. Looked at the PCB. Both PCB's I referenced earlier looked like the traces from video ground and each set of grounds on the ends of the JAMMA connector met up, meaning (at least to me) the grounds should touch.

I took out my multimeter, set it on continuity, found out that the JAMMA connector in the cabinet did NOT have continuity between the video ground and the cabinet ground.

So, what I did, not sure if this is correct or if I just shortened the life of my monitor... but... I made a small jumper that went between video ground wire and cabinet/common ground. Just a short piece of wire between #27 and #14 on the Parts side of the JAMMA wiring in the cabinet. It worked.

Anyone have any thoughts if this is the correct or a good way of doing this? I could have made a fingerboard adapter, but it I needed a quick fix, no fingerboards on hand.
 
I got this fixed, just in case anyone has a similar issue, I'll post what worked.

It was the video ground. Apparently a Sega New Astro City cabinet uses a separate video ground.

So what I did was this:

Printed out a JAMMA pinout. Looked at the PCB. Both PCB's I referenced earlier looked like the traces from video ground and each set of grounds on the ends of the JAMMA connector met up, meaning (at least to me) the grounds should touch.

I took out my multimeter, set it on continuity, found out that the JAMMA connector in the cabinet did NOT have continuity between the video ground and the cabinet ground.

So, what I did, not sure if this is correct or if I just shortened the life of my monitor... but... I made a small jumper that went between video ground wire and cabinet/common ground. Just a short piece of wire between #27 and #14 on the Parts side of the JAMMA wiring in the cabinet. It worked.

Anyone have any thoughts if this is the correct or a good way of doing this? I could have made a fingerboard adapter, but it I needed a quick fix, no fingerboards on hand.

Weird issue, ive tried about 10 different game boards on your cab with no problems.
Thats fine, it wont hurt anything, and the monitor is a nanao ms9,
This is Brian, The guy who sold you the cab BTW.
 
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Cool, thanks for the info. Yeah, I had tried 2 other boards plus I tried a MAME setup using a Ipac/arcadeVGA, they worked flawlessly. Apparently it is just a quirk with Raiden II. I am going to buy a fingerboard and make the connection on it, not that it's necessary, but I just don't like the look of the jumper wire on the harness. Plus, if I ever run into any other boards with this issue, I can just use the same adapter.
 
Yes as long as they are JAMMA, glad you got it fixed. Another fault from the same cause is often certain buttons or joystick directions not working. Some boards do not join up all their ground pins as they assume the cabinet wiring will do it, but some cabinet wiring just connects the grounds to the edge connector and assumes the board will join them all up. If neither does it you will get the issue were some grounds are not connected together, video ground is often one that is forgotten.

Its a common problem even on JAMMA boards, at the low end of the connector away from the power rails, the last few grounds often not connected to the rest of the ground plain and these are often used for the controller switches.
 
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