Should have noted that when first replaced i kept getting ring back tone over speaker in control unit, I removed speaker plugs one by one untilll ringing stopped on number one intercom plug. Also the power lights normal,peak and overload do not light.Should also say that this was a cold call customer who purchased replacement eq. on amazon.Talked to Bogen Tech and he wanted me to remove all speaker plugs and hook 1 speaker on 2 foot cable directly to unit to test.As i did not have speaker in van and did not want to remove a class room speaker to test. I left for other jobs. Will return Monday to test.
Jacktel