Build Your Own Arcade Controls Forum

Arcade Collecting => Miscellaneous Arcade Talk => Topic started by: Groovyg on January 21, 2011, 03:02:41 pm

Title: GT Complete w/ Nanao Monitor Issues
Post by: Groovyg on January 21, 2011, 03:02:41 pm

I just finished rebuilding a GT Complete, and have it connected to a Nanao MS9-29 Monitor. The problem is the screen keeps spinning vertically, and I cannot locate a "Vertical Hold"  :-[. I have a Sega City Manual with specifications on the Nanao MS9-29, but no mention in the four pages dedicated to the monitor for V-Hold.
Any suggestions out there?

Is this a Cap problem?
Did I miss a ground?
Are the Jamma Sync and Grounds reversed?

The GT-Board jumper and Monitor are both set to Medium resolution. Picture looks great, just keeps on spinning.

Thanks.

Title: Re: GT Complete w/ Nanao Monitor Issues
Post by: grantspain on January 21, 2011, 06:54:29 pm

got a pic of how you wired up the video input?

Title: Re: GT Complete w/ Nanao Monitor Issues
Post by: Groovyg on January 21, 2011, 07:19:43 pm

I am actually going to re-do the wiring.  But will send pictures when I get it done.  Should be tonight.

Title: Re: GT Complete w/ Nanao Monitor Issues
Post by: Groovyg on January 21, 2011, 11:29:01 pm

(http://img28.imageshack.us/img28/8665/img1367y.th.jpg) (http://img28.imageshack.us/i/img1367y.jpg/)
Spinning Screen

Title: Re: GT Complete w/ Nanao Monitor Issues
Post by: Groovyg on January 21, 2011, 11:32:09 pm

(http://img193.imageshack.us/img193/9941/img1368rp.th.jpg) (http://img193.imageshack.us/i/img1368rp.jpg/)
I think I have adjusted all of these pots, but nothing improves the spinning image

Title: Re: GT Complete w/ Nanao Monitor Issues
Post by: grantspain on January 22, 2011, 06:38:28 pm

everything looks ok from the pics set up wise
try connecting a 2k resistor from vertical sync to video ground at the video input plug
otherwise i would say that there is a faulty cap somewhere

Title: Re: GT Complete w/ Nanao Monitor Issues
Post by: Groovyg on January 22, 2011, 10:07:12 pm

Thanks grantspain.  I will try that, and if not, remove the monitor and change some caps.

Title: Re: GT Complete w/ Nanao Monitor Issues
Post by: grantspain on January 23, 2011, 02:49:37 pm

i worked on gt fore yesterday and the vertical sync is linked to the horizontal sync on the video input plug
try linking a wire over\(jam a bit of solder in) to see if that cures it