Wanted: NEC Turbo Duo repair help

[Kaze]

I'm not sure if anyone here works on video game systems but I'm hoping to find some repair information for the NEC Turbo Duo, also called the PC Engine Duo in Japan.

I've been working on repairing them for a few months now and can get some of the units to function just fine, but others are beyond me at the moment.

If anyone is familiar with these systems please let me know! Info is very difficult to find on the web. I'm a member over at www.pcenginefx.com and that seems to be the best resource so far.

Thanks for any help!