Hi, I am Tech Michael an expert in this field and I will be assisting you today. I am a Master Technician that's dedicated to giving you the best Answer possible.
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How old is your Simplex 4004 ?
Do you have the user manual fo rthis system?
The CITY/DACT TROUBLE is just an error usually with the signaling end of things, I will go further into that when you reply;-)