• Hello MLAers! We've re-enabled auto-approval for accounts. If you are still waiting on account approval, please check this thread for more information.

Looking for a working IIsi power supply

sigtau

6502
I successfully recapped my IIsi logic board, but unfortunately it had feedback issues in the video circuit that I narrowed down to the power supply--namely, physically tapping the tops of the DC-side capacitors in the PSU would cause the banding in the picture to get better or worse.  It did successfully boot to System 7.5 just fine despite this, it just has issues on the 5V rail that feeds the video circuit.

In an effort to recap the two power supplies I had, I have ultimately

  1. blown up capacitors in one, due to a short I can't seem to find on the AC side, and
  2. blown an unknown component on the DC side on another due to being an idiot and plugging it in with the mains exposed.  Took a nasty shock from that one, luckily the grounding features did their job.
Evidently I'm better suited to DC current sources!  There was a bright blue flash from the transformer that does the high-to-low voltage coupling, and now the supply does not deliver the correct voltages, so I'm calling it a loss.

I'm wondering if anyone has a IIsi power supply, confirmed working, or a IIsi altogether they are willing to part with that I can work with to finish this restoration project.  Ideally I would like to not have to open up one of those power supplies again in the near future.

Apologies if this is better suited for the Trading Post forum.

 
Well if you don't mind buying a whole IIsi I could sell you mine...would just need to make sure it's still working first.

 
Honestly?  That would probably be the safest bet.  I have no way of knowing if I killed the motherboard doing this.  Getting a known-good one and recapping that too would probably be a better bet.

I'm usually on IRC under this handle, but I'd also PM me here if you want to leave a paper trail.

 
Back
Top