528RE: [stationpro] Sudden Loss of Amp Keying
- Jan 4, 2014
Yes, you should be showing zero ohms across your N8LP SteppIR protector, so if you're getting 7.76K, then your N8LP box isn't working properly. That would certainly explain (partly) your amp keying problem. I don't remember if the N8LP unit requires a separate 12V power supply, but if it does, then one possibility is a 12V power supply problem. More likely, however, is that a fault in the L7 somehow zapped the N8LP unit and also the solid state keying relay in the StationPro controller. If the latter, then it's an easy job to swap out the solid state relay. The relay is opto-isolated from the other StationPro circuitry, so there's unlikely to be any collateral damage to other StationPro components.
If you've blown the HV use in your L7, then that means you had a short in the HV line to ground. An internal arc in one of the 3-500Zs is the most likely cause, though a failed component in the L7 power supply could also be the cause, though that is unlikely because the fuse resistor in the circuit is downstream from the diode bank and power supply capacitors (if I recall correctly). A short to ground can cause damage to other components, because the short circuit to ground has to work its way back into the power supply B- lead. That can damage meters and also cause other problems, including the amp keying circuit in the N8LP box and the StationPro solid state relay.For now, though, I'd disconnect the L7 completely from your station and focus on the N8LP unit, including its power supply.
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