I don't know if this is applicable or not--but---
1) Do you have anything connected to pin 1 of the ACC socket?
Keep in mind that if the audio level on pin 1 is "too high" the PTT doesn't work. This is readily evident when using a TNC where the audio level is too high; the TNC tries to PTT, but the rig won't key.
2) A different thought---maybe the microphone audio is muted when the rear ACC socket is keyed. That is common so as to keep from having a "hot mic" when transmitting via a TNC.
73,
Mark N8MH
At 07:17 AM 1/24/2010 +1100, Tim Tuck wrote:
Hi Bob,
Pin 3 can not be set to only tx on a specific mode BUT it can be set to only tx for a specific band. ( Page 58 of the manual ) I've been right throught the service manual and I cant see any way that your rig would do what it does. My suspicion is that the CPU has tied itself in knots for some reason, thus you might like to do a factory reset of your rig. ( page 18 or page 77 of the user manual )
If you do a reset you will loose all your memories and settings.
I know pin 3 works for all modes since I use it with a buxxcom interface for FSK441 for meteor scatter on 2m USB
regards
Tim
--
VK2XTT :: QF56if :: BMARC :: WIA :: AMSAT-VK :: AMSAT
Hello
I am trying to set up my 910/sequencer/amp. Checking things out before hard wiring everything I discovered when grounding pin 3 of the acc socket the radio does go to xmit, and will do cw,  however to send ssb the ptt on the mic has to be pushed. At times I use a Heil head set that has no PTT and I simply push the xmit on the radio. Do I have to pick off the PTT at the mic connector?  I am probably overlooking something obvious. What do you 910 experts have to say.
As always, thankyou
73 Bob W7LRD
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Mark L. Hammond [N8MH]