Here are the instructions for the PU-23 board.

 900X


Step 1:

Turn  the playstation upside down and remove the 6 screws from the base.
Turn the playstation back over and remove the top cover.

Step 2:

Removal of the cables and laser housing unit:

  1. Remove the connectors there are five of them in total.
  2. Remove the copper coloured cable.
  3. After the connectors have been moved. Remove the laser housing unit.

 

Step 3:

Removal of the Metal Bracket

Remove the four screws from the metal bracket. Now remove the metal bracket this will expose the circuit board.

 

Step 4:

You don't need to remove the 4 screws as the modchip goes on the top of the board.
However you'll need to bend back the metal cover slightly.

NOTE: Pin 7 of MULTIMODE 1.5 Modchip connects to the memory card/joypad connector.
NOTE: With MULTIMODE 1.5 you don't need to connect two wires from PIN 5 or solder a link wire.
Just connect the chip as shown in the diagram with one wire coming from PIN5. If for any reason this method does not work on your machine then revert back to the old method and connect a link wire from the point marked "
5" to the point marked "X"

Solder to the locations indicated below :-

 

 

Additional:

If you are an expert you may like to try and also do a colour correction modification.
This involves lifting PIN 157 and connecting the link wire to where PIN 157 once connected.
This little mod enables you to play your imported games in colour without using a scart lead.
I recommend that only an expert attempts this particular type of modification.
The diagram below shows you how to colour mod your PU23 board.

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