Anyone know Simplex 2120 a little or a lot?

Does anyone know anything about 2120 voice evac systems? I’m trying to figure out why I have a trouble on my message audio player. Mic module click relays on ocilator board control switches do nothing that plays tones and has osc stop. Also where does the speakers and visuals hook up to in the panel for the field? Where do I terminate my MAPnet devices?

Thanks guys!

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