I purchased a VIC 1 intercom system and having problems with the AM-1780 AMP. I have 24V coming out of the CX-4720 cable prior to the 1780; however, the power light does not come on. Bulb tested good with ohm tester.

System is not working at this point. Is there anything else to check? What other troubleshooting steps may there be when testing this intercom setup. I have the following:

CX-4720
AM-1780
C-10456
CX-4723
Two man setup with headsets

Thanks

 

there is a lot of use full info on the AM-1780 here https://radionerds.com/index.php/AM-1780~VRC