Sony PS1 Konami Guitar Freaks Microswitch Kit Guide

First you'll need to disassemble the guitar controller- remove all the screws in the back and flip it over to access the guts.

Then you'll want to unscrew all of the circuit boards inside, pull out the rubber conductive membranes, and the gray plastic piece that sits between the main controller board and the pick rocker. Set all this stuff aside.

This is the main controller board which you'll be tapping into with new wiring to connect the kit's 3D printed plastic harnesses and their respective switches. Pin 8 of the 24-pin chip is the pick signal, but it's much easier to simply scratch away some phenolic from the large trace extending from it to solder to than the pin of the chip itself. Lower below, four solder points lead to the fret board that was located in the neck of the guitar. Note that ground is marked #4 on this side of the board...

2: Green
3: Blue (or Purple)

Here is the main controller board with the original cable removed.

Solder 4 new wires of 14 to 15 inch lengths to the respective common (C) and normally open (N/O) pins of the switches on the new fret harness included in the kit. I suggest wiring ground to the common pins via daisy chaining them with short wire lengths so you only have to run one single dedicated ground wire through the neck down to the main controller board.

Remember that gray plastic piece that sat over the pick rocker?

You'll want to unscrew the metal tines and transplant them to the new pick harness. This metal piece helps return the pick rocker to center position- you may have to bend them closer together a bit with pliers to make them return to center better if they've been stretched out a bit from time/use. You can also now wire in the common and normally open pins of the pick harness switches as shown above, give yourself plenty of length to work with later.

Solder the normally open pin of the pick harness switches to pin 8 of the 24 pin chip located on the main controller board. As mentioned before you can scrape away some green coating of the trace that leads out from it and solder there. It's easy to identify this trace as it goes to those two carbon contacts that the rubber conductive pads originally used.

Now slip the pick harness into place as shown, you may have to gently spread the metal tines with a screwdriver so it will go over the purple rocker's center post, while its actuating levers clear the switches going to either side of it. Test the rocker now to verify that both switches can be triggered and reset when the rocker is at rest.

Pretty simple step here, place the fret button shims into position, they have a ridge at the bottom so the frets now have a rolling/rocking action similar to how a computer mouse button works.