V-Hold control problem on Nanao MS8-26SU FIXED

[mightychump]

Hello I recently got a 2nd hand Arcade/mame cabinet with a arcade monitor and a arcadevga video card yet no matter what I do I cannot get the image to display properly.

After installing the arcadevga drivers (www.ultimarc.com/avgadrivers.html) and restarting the computer I get huge vertical sync problems.
http://img89.imageshack.us/img89/4364/1000401cd1.jpg

Here is a picture of the insides of the cabinet

http://img143.imageshack.us/img143/4504/1000404sr5.jpg

The arcade monitor is a Nanao MS8-26SU and has a Mitsubishi A63JHF81X tube.

I had tried many times to get the monitor to use a 15 Khz refresh rate but I can never choose it when I try to change it. After installing the ArcadeVGA drivers and restating the computer should I be able to choose "15khz" from the "list all modes" options in the

Does anyone know what could be the problem with the V-Hold control on this monitor?

If anyone can help me that would be great. Thanks

[Ken Layton]

Please read this first:

http://forum.arcadecontrols.com/index.php?topic=62016.0

[Kevin Mullins]

You appear to have a Nanao MS8-26A / SU monitor which is a dual resolution type. (15K and 25K)

First thing you need to know is what setting is the monitor itself set at before you can feed it a compatible signal.
There is a large connector on the main chassis with a red, black, blue and white wire going to it. There are two plugs that this could be plugged into, one for 15K and one for 25K. Which slot is that in? (looks like it's in the right hand slot) The board should be marked as to which is which. (I don't have a manual handy)

Start there and I'm sure one of us can dig up a manual on that monitor to point out the other onboard controls.

[mightychump]

Thanks ken I found out that my monitor is a Nanao MS8-26SU.
http://www.homearcade.org/BBBB/mon75.jpg

I kind of managed to fix the V-Hold control issue with the monitor. The best I have been able to do is slow down the vertical scrolling of the image. The V-hold control knob on the monitor is very touchy, if I move the knob a fraction of a degree the scrolling changes pace significantly and I can't get the picture to stay exactly in the same place. The best I have been able to manage is to keep the screen in the one spot for about a minute but then the V-Hold  problem starts reappearing.

However I now have another problem with the monitor, I think it might be related to the V-hold issue but I am not sure. I constantly get almost horizontal lines (on a slight angle) I also get artifacts scrolling down the screen when I am playing. It's a bit hard to explain so I made a movie showing whats happening

http://www.mediafire.com/?0yigj1g1dyn

[grantspain]

the lines are because you have the screen volts on the flyback adjusted too high
the reason you cannot lock the pic is because you are not giving the monitor a composite sync,if you have seperate horizontal and vertical syncs then you can strap a 5k resistor from the chassis ground to the vertical sync wire to lock it down
you should contact andy at ultimarc as he will know the exact set up for a nanao ms8 monitor

[mightychump]

You appear to have a Nanao MS8-26A / SU monitor which is a dual resolution type. (15K and 25K)

First thing you need to know is what setting is the monitor itself set at before you can feed it a compatible signal.
There is a large connector on the main chassis with a red, black, blue and white wire going to it. There are two plugs that this could be plugged into, one for 15K and one for 25K. Which slot is that in? (looks like it's in the right hand slot) The board should be marked as to which is which. (I don't have a manual handy)

Start there and I'm sure one of us can dig up a manual on that monitor to point out the other onboard controls.

I just had a look at the large connector that you mentioned and it is currently set to "low" so it is in 15k mode.



I edited my first post to show the current arcadevga settings in windows can anyone else with a arcadevga card tell me if those settings are correct for a 15k monitor? Thanks

[AndyWarne]

The ArcadeVGA card always sends 15Khz (except if you have run the Tri-Sync utility which is inappropriate for this monitor).
Going into "list all modes" presents an opportunity for messing everything up completely so avoid this screen.
If there is no V-sync then this is a connection problem with the V-Sync not connected from the card to the monitor, or composite sync not being used (ie both syncs connected together and connected to the composite sync input on the monitor).
I think in your original post you are confusing H sync (ie 15Khz) with Vertical refresh rate which is shown on that screen.
I can probably help further with the connection problem from the card to the monitor by email. Especially if you have a manual.
Andy

[northerngames]

as greatspain stated if your H and V are not connected together as composite and are actually seperated it will not lock in I have the same monitor and tried for hours only to twist them back and it worked great once again.

if you try what was suggested and it works let me know becuase I did not try that and just settled for the composite but if I can seperate them and lock it in that way that would be even better yet.

[mightychump]

the lines are because you have the screen volts on the flyback adjusted too high
the reason you cannot lock the pic is because you are not giving the monitor a composite sync,if you have seperate horizontal and vertical syncs then you can strap a 5k resistor from the chassis ground to the vertical sync wire to lock it down
you should contact andy at ultimarc as he will know the exact set up for a nanao ms8 monitor

Thanks for the information grantspain. I am just wondering if that should be necessary because the person who I bought the mame arcade machine off said he had the machine working for years with the current setup. The reason he sold the machine was because the psu in the PC died and he doesn't really know anything about computers so he couldn't fix it. So he sold the machine to me.

I had a spare PC so I hooked that up to the arcade machine instead of replacing the psu on the old one. The only thing I used out of the old PC was the arcadevga card. The arcadevga card was the only thing that plugged into the arcade monitor on the old pc and it is now the same in the new PC so it should still work correctly right (it is connected via the j-pac, looks very similar to the setup on this page- http://home.planet.nl/~knol0401/mamecab/connecting.html)?

I tried putting the hard drive from the old PC into the new one but the computer locks up when it is booting up (at the mameex boot screen).

I was thinking that because I now have a setup that was basically the same as before that it must be a software issue and not a hardware one? Thanks

[mightychump]

as greatspain stated if your H and V are not connected together as composite and are actually seperated it will not lock in I have the same monitor and tried for hours only to twist them back and it worked great once again.

if you try what was suggested and it works let me know becuase I did not try that and just settled for the composite but if I can seperate them and lock it in that way that would be even better yet.

Could this happen accidentally, because of a loose wire or something like that? Because as I said in my last post, this monitor was working in the exact same setup for years (except for the new PC). Also could you please tell me exactly what I have to do to fix it. This is my first time working with a arcade monitor and I really havn't got a clue how to do what you said. Where exactly is the Horizontal and vertical sync? Thanks

[northerngames]

looking from the rear of the monitor look toward the front right on the side of the chassis there should be 5 wire a red,green,blue,blue with white stripe and a white wire is there 5 or 6 wires on yours?

[mightychump]

looking from the rear of the monitor look toward the front right on the side of the chassis there should be 5 wire a red,green,blue,blue with white stripe and a white wire is there 5 or 6 wires on yours?

Hello I think I have found the wires you mean. There are-red, green, blue, white and "blue with white" on it. There are only 5 wires attached to the plug. Is that correct or not? Thanks

[grantspain]

red,green and blue are the colour inputs
white is composite sync
blue/white is video ground

[mightychump]

red,green and blue are the colour inputs
white is composite sync
blue/white is video ground

So it should be getting composite sync now and that is what I should be giving it?

Could a damaged monitor cable going to the arcadevga be doing this? Cheers

[grantspain]

if you had a damaged cable i.e no sync signal your picture would be a real mess not just rolling
sounds like you are only feeding horizontal sync to the monitor

[northerngames]

the harness pictured above is to swap from 15k to 25k the wire's I meant would be located more toward the top right corner of your picture.

they are the wires that go to your monitor from wahtever game set-up your trying to hook it up to.

mine are soldered wire right onlt the chassis but whatever is outputting the signal to your monitor trae the wire's from it to where it goes into your chassis and see if there is 5 or 6 wires running to it.

the wires are around the same size as your control panel wiring.

[mightychump]

OMG you guys are not going to believe how stupid I am. Guess what the problem was the whole time... a loose PS/2 cable on the J-PAC >.<

When I was checking the vga cable I seen that the PS/2 cable was not connected properly. Once I plugged it in firmly the screen was perfect. Can't believe that I was stumped for so long such an easy solution. Sorry for wasting everyones time.

But I am sooo happy that I finally got the monitor working correctly. I was almost ready to throw the nanao out the window.

Thanks to everyone who tried to help. Once I get it all setup I will post some pictures of the cabinet, it looks brillant. It's much better than I ever could have made and I got it at a great price. Thanks again.