Sony PSIO Installation Manual page 5

Switch board, playstation mainboard
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The next stage is to cut a trace on the Parallel Port. It is known as Pin 5, and it is a Ground pin, but it must
be used instead for the Switch Boards "EN" (Enable) line.
Cut through the marked point in red to isolate Pin 5.
Solder Pin 5 to the "EN" line on the Switch Board.
5
PSIOSB08052016-PU7

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