Thanks for the reply GGG.
Yeh......I have replaced the cap with the new one, but have not tested the board to see if it is working.
You are probably right in that the original problem may have been with the top board.
I was not able to get this top board or bottom board for that matter to work in my "test mule" PS1 Rail King C.S.X . SD60M Diesel (30-2116-1).
I tried each board individually with the matching good board in this loco.....problem bottom board with good CSX top board, and then good CSX bottom board with problem top board. That is the way I was able to determine that both boards were bad and to be relegated to the "junk box".
Question: The older/original QSI reverse boards - Proto-DCRU's (I have a number of these older boards I use to transplant into conversions when I remove the broken AC armature motors in my Swiss Buco loco's, and replace them with modern Maxon DC can motors) can be bench tested to see if the reverse relays are working properly.
Can I bench test the PS1 bottom board on its own (no top board attached) to determine if the bottom board will run a DC motor, and change its direction by applying on-off-on power??
Thanks again guys......it has been a steep learning curve for this old AC armature and field coil magnet model train nut.
Peter.....Buco Australia.
