Closed Unplayable Twilight Zone
Description

In an attempt to address bug #312, oliver and i replaced switch 28. Upon attempting to test the new switch found all of column 2 in the matrix (which had previously working) stuck open.

  1. double checked polarity of the diode on the replaced switch - OK
  2. visually inspected the connection of the green-red wire that chains together column 2 in the matrix- connection of green-red to all the switches looked ok

I think the next step is to start looking at pins in the back-box maybe……

Column 2 in the matrix runs to j206

Media

No media.

Log Entries

Log Entry

Went through with logic probing the switch matrix circuit, on every other column points A and B both pulse (imagine they are both oppositely activated as intended but pulsing, unsure if im understanding that correctly) but for the green red issue column point B still pulses properly but point A is a constant high. If I am correct with my reasoning and the IC is broken, the replacement is a ULN-2803 as denoted on the manual.