• Now just solder the wires to the points according to the pictures below, make sure you match up each Pin Number with the appropriate Numbered Solder Point by looking at the numbers in the arrows.
  
  A good soldering method is to very lightly coat the wire with solder, then let your soldering iron heat up, hold the wire to the spot to solder, and then touch the wire with your iron.  It should fuse with the spot immediately. Remove the iron and let it cool, and your connection is done.

SCPH 100x (Newer Version):
(The chip is soldered to the bottom of the playstation circuit board)

SCPH 100x (Old Version):
(Notice the extra solder points around #6)
(The chip is soldered to the bottom of the playstation circuit board)

The numbers on the arrows represent which pins on the MOD Chip that point needs to be soldered to.

Once you have soldered all the points, make sure all your connections are good and that you have not accidentally connected any adjacent points.

Cover the Mod Chip and any visible pins and wire with electrical tape.  Also put tape over the solder points just to isolate it from the bottom of the PSX and cut down the chances of a short.

You can tape the chip to the board using electrical tape, or if you like double sided tape.

Reassemble your PSX and make sure the mod chip and wires do not get caught or crimped.

Also make sure that all connections to the laser unit and circuit board are replaced correctly.

YOUR DONE!

As long as you've followed the instructions carefully, you will have no problems.