Sharp Twin Famicom Disk System Issue

[daskrabs]

I have a Turbo Twin (AN-505-BK) that I bought busted and dirty, but in decent cosmetic shape. New 3rd party PSU. The Japanese seller said "when power go in, smoke come out." I figured it had a bad main cap, correctly, which I replaced. The cartridge side now works fine, although the A and B buttons don't work, but they're probably just dirty contacts. The Disk System, on the other hand, won't light up at all. All I get is a grey screen instead of the "Set Disk Card" or whatever. No disk activity at all. Seems to be attached correctly and all. Any thoughts?

[ApolloBoy]

That doesn't sound too good, have you tried checking the 2C33 yet?

[daskrabs]

No, how should I do that?