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Flex 6400M issues

I recently bought a used 6400M to use while my 6600M is at Flex for repairs.

  1. This 6400 HDMI display port does not have video. Monitor works elsewhere.
  2. using the Flex hand mic and working fine, but my 781 does not work connected to the 1/8” mic connector.
  3. Do I have to use a pre-amp?
  4. This 6400 M has the latest software. My 6600 does not, so maybe that the difference in the next question. When I turn the radio off, the on/off button stays lite solid. My 6600 does not. Any ideas? Thank you Gary KG5CW


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