First things first....Determine if it is in the PF or on the board.

See the J connector #'s listed in the row and column? Pull those connectors (looks like J206 and J209). Put the machine in switch edge test. Using some alligator clips or a short wire, jumper each pin on the board of the columns to each pin on the board of the rows. 64 possible combos. Each jumper should match the intersection shown in the matrix. So, column 1, row 1 would be 11 (not used). Column 1, row 3 would be 13 (start button) and so on.

If you see the same problem, then the issue is in the board. If you don't see the problem and all the switches check out, then the problem is likely with a diode in the PF.

Do the above test, and report back to see where the issue lies....

Can't go by physical orientation, as the switch could be 180 degrees....Look at your posted switch matrix diagram. You'll see the symbol for the diode and the way it should be connected. See the triangle connected to the row? That's the diode. See the arrow pointing toward the switch with the line across it....That represents the band on the diode. So, the NON-banded end of the diode according to that diagram is connected to the row, then to the switch...Other side of switch to column. Look at the wire colors for the rows...They all White-X in common, whereas the Columns are all Green-X. So, look at other switches as an example and you should see a White-X wire on the non-banded end of the diode and a Green-X wire on the switch not on the diode. The banded end of the diode should be on a switch leg by itself. Compare it to switches in your PF and you should get a sense of how it should be.

As for your question, yes just skip the pin that's not there on the matrix test. You'll see the matrix rows do the same as it goes -1, -2, -3, -4, -5, -7, -8, -9 (skipping pin 6).

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Okay...MM Catapult...Same deal, tho....White wire on non-band, band by itself, green wire by itself.

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