Modifying 125V SCPH-100x PSU for 220v operation?

I recently came upon my old 1002's PSU (I should mention that the machine was opened before I got it, hence why it came with a US/JP PSU) and decided to convert it. The machine DOES have a PAL SCPH-5552 PSU installed and converted by myself.

Now, I know for a fact that it already came with the primary cap changed, and so does the transistor next to it. (cap is a Panasonic CE, 47uF 400V and the transistor is a Mitsubishi FS3TM). Other components seem to be the factory ones.

If needed, the model of the PSU is a Mitsumi SR670, and the AC plug is a US one. I do have other discarded for parts PSUs from newer models and I can try and swap transformers if needed, and fuses aren't a problem.

So, any tips I should look out for when converting it?

 

I read this recently, I know it's not the same console but maybe it might be of help.

https://assemblergames.com/threads/psx-desr-7700-power-supply-220-v-mod.68025/

 

I made a pinout to use a PAL PSU inside JPN and US PS1 systems. For me it is simpler and safer to use a unmodded official newer PSU, a 100X PSU generates much heat.

5-Pin PAL PSU to 7-PIN Mainboard(PU-7 JPN Mainboard here)

Works just fine.

 

This pinout will work but it would be better to use the second ground pin as well.
Otherwise you've got too much current flowing back through just that one pin.

Additionally, there is a second 3.5V pin on the mainboard side that isn't connected here.
I don't know what exactly it does, but it is something on the audio output buffer. Maybe "pop" prevention.

 

Yes, prevents pop sound on startup. Keeps audio DAC on standby maybe. But a PIN-5 PSU dont have standby 3.5V afaik.