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ITC-404SP Stereo Panel troubleshooting

CHI_Pilot

Member
I bought a plane with an ITC-404SP Stereo Panel but I don't know if it works. Internal communication is poor at best. I'm using a Bose a20 headset and my passenger is using a passive David Clark. All/Pilot switch works, but the volume doesn't seem to work well. Plus, I am not sure if the auto squelch is working as it should. Does anyone have any suggestions as to how I can troubleshoot it?

Connected radio is an XCOM 2.25 VHF radio which seems to work ok for both passenger and pilot.
 
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