Black Knight
Williams, 1980My Black Knight (system 7) just started freaking out. Whenever any one of the ball trough switches is closed, it registers its proper switch number, but also 5 other switch numbers. Each ball trough switch registers 5 different switch numbers from the other 2 switches. If I test one of the “erroneous” switch numbers individually, they register just their own switch number.
Is this a driver board issue or a bad switch or diode issue?
Could be a diode but I would look for a ground first. Did it start right after you raised/lowered the play field? Since it is the ball trough area, something may have bent when you lifted /closed the play field. I would look for where a metal switch /connection is touching metal.
I would also look at the switch matrix in the manual at the row/column that is actuating. follow those wires and you can find the problem also
I disconnected the switch column and row connectors from the driver board and jumped individually from column to row pin and I still get multiple switch closures in test mode on column 3, so I know the issue is somewhere in the driver board. Credit to Pinwiki procedure below.
BK Switch matrix test (resized).png
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Chicago, IL