John's Arcade Forum - Classic Arcade and Pinball Collecting and Restoring Discussion Forum - RETRO MAME - Nintendo Vs Forum

Tech and Marketplace => I need help with my game! - Technical Discussion => Topic started by: burningman on March 20, 2013, 12:57:05 pm



Title: RFM video amplifier video
Post by: burningman on March 20, 2013, 12:57:05 pm
hey John...great site and thanks for all the informative videos...

I am in the process of doing this mod and have ordered the amp from ultimarc but had a few questions...

After looking over the video, would you happen to know of a source that may have a molex connector for sale that is already wired that can connect to the board behind the monitor? (like the one you had to piece together using two connectors)  I have never made a molex connector and don't have the tools either.

Also, is there a way to test to see if I have 5 volts coming from the video card before installing the amp?  I would really like to find out if I need to tap the computer for that 5v before I dive into it.  And adding to the question above, if I don't have the 5v, is there a source where I could get the correct connetor to attach to the supply from the computer?

Thanks in advance for any help....I am excited to get this mod done.   ;D


Title: Re: RFM video amplifier video
Post by: John's Arcade on March 21, 2013, 10:22:53 am
hey John...great site and thanks for all the informative videos...

I am in the process of doing this mod and have ordered the amp from ultimarc but had a few questions...

After looking over the video, would you happen to know of a source that may have a molex connector for sale that is already wired that can connect to the board behind the monitor? (like the one you had to piece together using two connectors)  I have never made a molex connector and don't have the tools either.

Also, is there a way to test to see if I have 5 volts coming from the video card before installing the amp?  I would really like to find out if I need to tap the computer for that 5v before I dive into it.  And adding to the question above, if I don't have the 5v, is there a source where I could get the correct connetor to attach to the supply from the computer?

Thanks in advance for any help....I am excited to get this mod done.   ;D

You could buy a JAMMA harness on ebay for cheap and cut the monitor connector off of that. Just make sure you get one that is wide enough or is the two plug version. I heard the repro MCR monitor cable can be used for this too.

I think the easiest way to test the 5V is to plug the board into your computer and then test on the test point on the ultimarc board. I did that in my video.

5V should be present where the below arrow is. If it's not, that's where you need to jump your 5V to.

(http://www.ultimarc.com/images/vidampconn.jpg)

Otherwise, you need to get the pinout for the video card and test one of the pins at that video card vga out.

In my video I mention that I went to Radioshack and got a power plug that was already made up for a hard drive.