I received two Mackie d8b's that were once part of a TV broadcast operation. They were taken out of service about 10 years ago and have been sitting in storage. I have been able to fire them up, but when I feed them audio, either from mics, tone generators, line sources... I get nothing on any given input channel. No levels on the meters. The system is running v3 of the software.
What should I start checking on, step by step, to figure out what is going on?
Are the CPU's mated to a particular control surface? Could I possibly have them switched?
Is this a CPU problem or a control surface problem?
Any help would be appreciated.