Monday, 16 November 2015

PC Engine Core Grafx PAL RF to RGB

I recently picked up two PC Engine consoles one standard white one and this core grafx. The white one only gives a black screen at the moment so I decided to work on this one instead as it worked. Usually this would be a straight forward case of wiring up a composite cable or rewiring the connector to output RGB, but nothing is ever easy. This Core Grafx had been modded to output PAL RF using an aftermarket pcb and rf box.


What a rats nest.

 Removed the RF box and PCB.

I removed some of the solder mask with a fibreglass pen so I can solder the new connector to the pcb at an angle.

Mega Drive 2 video connector fitted.

Slightly neater than before, I used the through holes in the pcb to feed the wires through.

I should have used a larger connector but since the original was missing I decided to use this one that I had on hand. I also like the idea of being able to use a standard Mega Drive 2 scart lead and not have to make a custom cable.

I installed a THS7314 video amplifier inside the system which I have covered before so won't go over again.

After I tested that it worked as it should I put it back together and then decided to check if C162 should be populated which I should have done before I put it back together, as it turns out it should be. It was so cleanly removed it didn't occur to me that a cap should be there, but a google search told me that C162 is a 470uf 16 capacitor. 

There wasn't room to install it in it's original position so I hot glued it to the pcb where there was space and ran two wires to the two pads.