PU-22 MM3 modchip installation diagram

This is my favorite version of the PlayStation 1. It’s in newer systems, so the lasers are more likely to still be in good condition, but the system still has both the serial and parallel ports on the back. This board was used primarily with the SCPH-7500 series of systems.

For more information about MM3 chips click here, for more information about PS1 modchips click here.

PU-22 MM3 modchip installation diagram

MM3 chip pinout

PU-22 MM3 modchip installation diagram

Above is the diagram for the PU-22. Pin four is located towards the top left side of the board. Only seven wires are needed for this board, just leave pin two disconnected.

This diagram is fairly straightforward. There aren’t really any tricky points, or surface mount components you need to solder to.

Installation tips

Here are some tips I have for you when you are soldering your chip into the PU-22.

  • Watch out for solder splatter when you are desoldering the metal shield on top of the board.
  • Placing the chip where the pin seven circle is seems to be the ideal location.

Diagram success rate

Here’s a list of people who have successfully modded their console with this diagram. Leave a comment and I’ll add you to the list.

  1. William Quade (me) (I’ve used this diagram many times and haven’t had any problems with it)

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