Will this mod work for Panasonic FS-A1WX?

Well, the new transformer is in. The transformer's pin 1 is connected to pin 1 on the board (yellow wire), pin 2 is connected to pin 2 on the board (white wire), pin 3 is connected to both pins 3 and 4 on the board (yellow and blue wires). The voltages seem to be stable: +5.02, -12.08, +12.28. The transformer is barely warm after half an hour of testing, so are the DC converter components. The sound cartridge plays without any problem - no humming. So this upgrade is complete.

The toughest part was (again) to remove the old power cable from the cable holder. It took over an hour! The rubber is very dense and to make a proper hole for the new cable without damaging the holder takes a lot of patience.

DISCLAIMER: If you are doing the same upgrade for your MSX2+, you are doing it on your own risk. I am not responsible for any possible damages resulted from this upgrade.

Thanks. No, I just changed the transformer like in TurboR ST before. Ran the computer for a few hours with demos and games - no issues. However it may be possible that the computer may have power shortages with some power-hungry hardware in one of the slots. I just don't have too much external MSX hardware to test the mod completely. But with Wozblaster and all our group's (and my own) cartridges everything worked fine.

I bought a 20mm wide and 100mm long aluminium strip in Bauhaus for 2.5 euro. So I cut the necesary piece and drilled the holes. Cheap and easy.

Done two of my four panasonics now. It took a little while to convince myself to just get going. Cuz yes, you don't want to ruin your gems. But luckily I have a test rig which is allowed to die... And it lived

I got the same transformer as described in this topic. It's just that Alexey's description confused me a bit because on the mainboard side I did not see pin numbers and on the transformer the pin numbers are different. Also the picture didn't show what happened because the 220V lead blocks it.

This is how it should be connected.

You are allowed to mirror the wires because both outer pins are the same. Just keep the blue and yellow neighboring wires grouped.

I chose to replace the mainsconnector instead of the whole cable. Saves the trouble with the rubber block which Alexey did battle with :)

You only need a 220-240v rated power cable. And of course a good soldering iron and heat schrinkable tubes to insulate the soldered inputs and outputs of the transformer.

An aluminum strip to hold the transformer in place is advised (this is an example picture, not the actual WX mod).

BUT if you never soldered electrical cables or worked with a soldering iron, do not proceed with this mod. It may be dangerous for you and your computer. 220v is not forgiving...