Here are the instructions for the PU-20 board.
Playstation 700X Modification
Here are the instructions
for the PU-20 board.
Step 1:
Turn over the playstation and remove the 6 screws from the base turn the system back over and remove the top cover.
Step 2:
Removal the cables and 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 circuit board as the chip goes on the top of the board.
There are 7 points to solder your wires.
NOTE: Pin 7 of Stealth Modchip connects to
the memory card/joypad connector.
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 cutting a track on the board and connecting a link wire.
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.
To Colour Mod the 700x, first remove the RFI shield from the top of the
board by heating the solder points and lifting the shield legs up as the solder melts.
Next, locate the circuit trace that runs from pin 157 of the GPU chip (IC 203) to pin 13
of the H7240A video encoder. The easiest approach is to cut the track on the top layer,
just after pin 157 (if looking at the PU-20 board from the front of the PSX as it normally
sits, this line is vertical and has plenty of clearance around it) with an x-acto knife.
Having done that, there's a pad following that track and that's where you solder a little
piece of wire on and the other end to either GND (anywhere on the groundplane obviously)
for PAL or a +3.5V supply line for NTSC.
Here is a close up of where you should cut the track.
