Air-4 FAQ
A. The mute function and the on-air tally function cannot be separated in the Air-4 console.
A. The IC sockets are for the mic preamp ICs and for the balanced line driver output ICs. The CONA4-4 connector board has two SSM2019 mic preamps (p/n 320003) for Mic Inputs 3 and 4. The Master panel has two SSM2019 mic preamp ICs for Mic Inputs 1 and 2 near the rear of the board, plus five SSM2142 line drivers (p/n 320004), for the left and right channels on the two PGM buses and for the caller outputs, that are in a row near the side of the board.
A. First, eliminate any external reason for this issue by swapping the input signal cable on the "bad channel" with a known good input signal to see if the issue follows the incoming signal or stays with that fader channel. If the input cable is firmly latched into the RJ45 jack, but the "bad channel" continues to have the same issue, the next step is to swap faders.
Note: Any time you work on the Air-4, power the console off by unplugging the AC cord on the power supply.
The Air-4 has faders with plug-in cables. To access the faders, or to swap out an Input panel, remove the four mounting screws from around the 6-channel Input panel with the "bad channel." Lift the panel up from the front just enough to access the fader cables. Unplug the "bad channel" fader cable and the adjacent channel fader cable and swap the cables so the adjacent fader now controls the "bad channel."
Note that the Input panel has two ribbon cables that connect it to the rear panel connector board and to the Master panel. Use care not to unplug these cables or dislodge their connectors. Always verify both ribbon cable plugs are properly seated prior to setting the panel back onto the chassis.
Power up the Air-4 and see if the intermittent or missing channel problem is now occuring on the adjacent channel. If it is, that means the fader on the "bad channel" needs to be replaced. An Air-4 fader assembly is p/n 059737. They can be purchased on our on-line Wheatstone Store.
If, with swapped faders, the problem remains with the original "bad channel," that means either the rear panel connector board or that fader channel's components on the Input panel are at fault. Since the two Air-4 Input panels are identical, swap the two Input panels (after powering the console off) to see if the issue stays with the original channel--which would indicate an issue with the rear panel connector board or with the ribbon cable between that board and the Input panel. If the issue follows the Input panel, that says there's a fault on that Input panel. Since there are no user-servicable parts on the Input panel, beyond the plug-in faders, contact Technical Support to get a Return Authorization number so you send that Input panel in for repair.