Game froze/Killing the Whine

ok - Just got a Guwange board (!!!!!I'm really pumped!!!!)

But - My Shooter cab has always had a bit of a "whine" when it's on. I've had three cabs and all of them did this, but I wouldn't mind eliminating it if I could. Any Suggestions.

Also - Guwange froze once when I was playing it. Turned it back on and it was fine. I'm assuming it was a fluke - should I be worried?

Hey Lashujin! I take it you're talking about the high pitched faint (usually) squeal ya get from the CRT rather than something else like a cooling fan with worn out bushes??

Sadly I really don’t know why some monitors make a high pitched squeal, but usually seems it depends in the refresh rate as to how apparent it is. Maybe Toddy can help out on that one.

On to Guwange:
1) Freakin awesome game man and one that can be hard to find particularly at a reasonable price.

2) The freeze could be related to a power issue, I would suspect too much voltage would cause that, as deficient voltage or current will usually cause a board to just randomly restart rather than lock up. Guwange is a little PCB though, and I doubt it pulls much current, but I would still make sure your voltage on the 5v rail is pretty much on the money when under load or perhaps a touch over, like 5.1v, certainly no more than that.

Good luck with that!

The whine will probably be an inductor core oscillating in the monitor’s horizontal output stage.

Maybe the width coil (if it has one) or possibly the flyback transformers former/core.
Its a good idea to make sure that the lfbt is securely mounted if it has nuts bolts to secure to the main board and H output transistor heatsink.

Sometimes loosening then retightening such screws or nuts bolts can clear this type of problem.

If its the width coil some correction fluid may help stop the core physically oscillating.

Whatever you do be aware of the dangers of monitor high voltages.

Thanks,

Will look into this tommorow

ttooddddyy said:

The whine will probably be an inductor core oscillating in the monitor’s horizontal output stage.

Maybe the width coil (if it has one) or possibly the flyback transformers former/core.
Its a good idea to make sure that the lfbt is securely mounted if it has nuts bolts to secure to the main board and H output transistor heatsink.

Sometimes loosening then retightening such screws or nuts bolts can clear this type of problem.

If its the width coil some correction fluid may help stop the core physically oscillating.

Whatever you do be aware of the dangers of monitor high voltages.

Click to expand...

Lashujin said:

ok - Just got a Guwange board (!!!!!I'm really pumped!!!!)

But - My Shooter cab has always had a bit of a "whine" when it's on. I've had three cabs and all of them did this, but I wouldn't mind eliminating it if I could. Any Suggestions.

Also - Guwange froze once when I was playing it. Turned it back on and it was fine. I'm assuming it was a fluke - should I be worried?

Click to expand...

Hello ,
I got a lot of experience with pcb`s and a frozen game means always that you have some dirty roms on your pcb , it has nothing to do with the power , whipe out your Roms one by one very carefully with a screwdriver and clean the pins with a piece of VERY fine sandpaper , inside the pins and also outside , clean also the sockets with a clean paintbrush and place them back to the correct locations , WARNING be sure that the roms will be placed exactly as they came out otherwise your game will be history :-( .

Regards Dragonfly

Considering there's only 2 EPROMs in sockets on these beautifully turned out and rather modern PCBs as opposed to the likes of say Capcom CPS with loads of socketed mask/eproms, I doubt it's gonna be a dirty pin or two. If it's not power related then maybe there’s a problematic logic chip somewhere on the board. When the PCB has been running for a while you should run the back of your hand over all the chips on the board to see if any of them are excessively hot. Warm is to be expected BTW

But then it may have simply been a fluke

John_Smith said:

Considering there's only 2 EPROMs in sockets on these beautifully turned out and rather modern PCBs as opposed to the likes of say Capcom CPS with loads of socketed mask/eproms, I doubt it's gonna be a dirty pin or two. If it's not power related then maybe there’s a problematic logic chip somewhere on the board. When the PCB has been running for a while you should run the back of your hand over all the chips on the board to see if any of them are excessively hot. Warm is to be expected BTW

But then it may have simply been a fluke

Click to expand...

Even if there was only 1 rom on this pcb : if its dirty it will frozen the game , believe me I know what I`m saying :-) .
Those modern Jamma pcb`s don`t mind to get a little more or less voltage : they can handle that , can`t say the same about bootlegs :-(

Regards Dragonfly