It never boots up. You get the two shark fins, and that's it.
I've tracked it back to:
Main Relay Signal: 0.07vdc ON to 4.88vdc OFF (CN3-7 @PRCB, CN009-6 @PS)
Driver Relay2 Signal: 0vdc ON to 5.21vdc OFF (CN3-5 @PRCB, CN009-8 @PS)
It loses all the 24.2vdc supply voltages for 5 second intervals. Removing all the 24 volt loads doesn't make any difference, so I do not suspect a dead short.
The 5.1vdc supply voltages stay steady.
I came to the conclusion that the PRCB circuitry that controls the relays has failed. Can anybody confirm my theory? =^..^=
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