What are these pots on my neck board? (pictures)

[Pyronious]

Hey,

I have an old Hitachi GMK-29FS2, which is a 29" (27" viewable) arcade monitor switchable between 15kHz and 25kHz modes.

I don't have the manual for it, and am attempting to determine what the 5 pots on the neck board are.  Does anyone know, or have the manual for this monitor?

By the way, how should I go about cleaning this thing?  It's disgusting.

P.

[OSCAR]

I don't have any specific info for this monitor, but my 25" switchable pentranic monitor has 5 pots in a similar location on the neckboard.

http://www.oscarcontrols.com/pentranic/pen1425-neckboard.jpg

In my pic, they are (left to right):

Blue bias, Green bias, Red bias, Red drive, Green drive

That's not to say they are the same as your monitor, but I would guess they are the color drive and cutoff pots, as well.  Basically, don't mess with them unless you are having color issues with your monitor.


Here's a general monitor/pcb cleaning FAQ complied by Clay Cowgill (www.multigame.com):

[Pyronious]

Cool, thanks for the cleaning tips.

So now, what is the difference between:

R/G/B Bias (neckboard)
R/G/B Gain  (front-panel)
R/G Drive (neckboard)

How exactly do these affect the image?  The monitor *does* lack the ability to display dark values, as explained in the following thread:

http://www.arcadecontrols.org/yabbse/index.php?board=4;action=display;threadid=7934

Thanks,

P.

[Impostor]

My 29" monitor in my Japanese cabinet have the same controls.  The 2 pots are the Red and Blue drives.  The 3 are the RGB BKG pots.  

I've only messed with the R/B.  Never with the RGB BKG pots.

Impostor