New Astro City MS9 Problem

[cabsR4pimps]

Hi Everyone,
What causes a monitor to do this?
Thanks,

[gray117]

[horizontal] pin cushion ... typically could be down to a capacitor just about to go/gone, however it *might* be an issue with the monitor board.

Got schematics for the monitor? That will probably help narrow down the area to examine...

erk! just noticed black bit... 8 times out of 10 it'll be capacitors just getting old; but maybe just check that something hasn't caused this to suddenly happen - problems with power / a loose wire etc...

[neorichieb1971]

That cab used to live in a North Korean bunker damn

If by using the stretch, shrink, vertical and horiztonal controls you can't get it full screen its the capacitors. The electric buzzing effect looks like a degauss but I suspect its grounded somewhere. Look at the caps around the monitors PCB board and see if there is any leakage.

[jonny5]

Contrast is too high. It could also be the screen volts(on the flyback) too, especially if you are getting a high-pitched whine.

Try turning down the contrast pot on the remote board before you mess with the screen volts; if that doesn't work then look at adjusting the screen volts and see if that helps.

You should be able to sort the shape with pincushion adjustment on the chassis.

It looks like you may have convergence issues too, which is not as easily fixed. It could just be the photo though.

Aside from that, use the size adjustment pots on the remote board to fill the screen.

If you dont have a manual you can get a copy off the arcade otaku wiki, and it will detail where all the pots and stuff I mentioned are located on the chassis/remote board.

[cabsR4pimps]

What voltage should the B+ be set at? How do you test and adjust it?
Thanks for the help everyone.

[Dave_K.]

You really shouldn't be messing with the monitor/chassis unless you know a lot about electronics safety. There is enough voltage there to kill a person if you don't know what you're doing!

Although some tweaking of the adjustment pots and screen voltage might make the picture a little better, I'd agree with gray117 in that it looks to me like it needs to be re-capped.

Anyway, I'd suggest you post a message for help on the KLOV forms, to find someone local to you that has been in the hobby awhile, and knows their way around a monitor before diving in yourself.

[cabsR4pimps]

I'm just really at a loss with the cabs I bought from the neo-geo.com group buy. They were all junk.
They would not work at all, so I sent the chassis to Chad @ arcadecup.com and this was the response I got.
____________________________________________
"Hello, Thank you for sending in your monitor boards for repair.

However, the nanao ms9 I had hit a dead end.

The problem is, some of the surface mounted transistors on the belly side have absolutely no data code!

So I have no idea what the component is. So I hit the schematics, NO DATA!. Just the transistor location with no name..

Sorry I could not go further with it.. however I will be able to tell you that it is missing drive in the power supply section to provide the chassis with b+..

The mosfet is missing gate drive.

As of now though nothing I can do."
____________________________________________
So anyways I started buying up Chassis from members on this site to fix the machines but so far no luck on a good chassis.

[Dave_K.]

The response you got pretty much says it all, and no amount of adjusting is going to fix it. Sorry but its a goner. I'd look into getting a drop-in replacement chassis like the Wei-ya or similar.

[drunkninja24]

Oh, did you get cabs from that shit-tastic group buy on Neo-Geo? Feel for ya, man. I have no idea how that dude got away with selling shit like that.

Sorry I can't offer any real help, though.

[cabsR4pimps]

Yeah, I just still can't believe what a nightmare it has been. Once again, Thanks for the Ibara PCB.

[oxtsu]

MS9 chassis on ebay

http://cgi.ebay.com/NANO-DUAL-RES-27-MO ... 255e7ae9f1

Thankfully they were used on a lot of 'deluxe' sega cabinets here in the US. You may have to change the input connectors, but the chassis itself is the same.