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No DME output

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rpostmo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rpostmo Quote  Post ReplyReply Direct Link To This Post Topic: No DME output
    Posted: 02 Feb 2021 at 10:09am
After doing the swap from a GNS 430W  to the IFD440,
there is no output to my KN64 DME.  It is on a toggle switch with
my IFD540 which works normally.  Every possible configuration change
I could come up with made no difference.   My avionics shop is now 
working on it.  They replaced the IFD with another GNS430W which
outputs DME normally.  They then plugged the IFD440 into the IFD540
rack and no DME output.   I had previously sent the logs to Avidyne
which showed normal DME function.   After some phone consultation
with Avidyne tech support, my avionics shop sent in the IFD440 to 
Avidyne and it came back with a report "no defects found".   They 
reinstalled it and still no DME output to the KN64.   Any and all 
help is greatly appreciated.
Bob
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dmtidler View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dmtidler Quote  Post ReplyReply Direct Link To This Post Posted: 02 Feb 2021 at 1:51pm
I assume it has been verified (probably several times) that the DME Channel Mode on the VOR / LOC / GS CDI maintenance page is set to "King Serial".



Edited by dmtidler - 02 Feb 2021 at 1:52pm
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rpostmo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rpostmo Quote  Post ReplyReply Direct Link To This Post Posted: 02 Feb 2021 at 2:11pm
Yes, tried that on more than one occasion.  
I tried many different configurations on the IFD440, including
exactly matching the IFD540 configuration (which works with the KN64).
It was a bit tedious as I don't have a VOR on the field, so after
every configuration change I had to fly to a field with a VOR/DME  to test.
That's one of the reasons I turned it over to my avionics shop.  I'm 
wondering if there could be a pin missing in the connector....I'm guessing
that Avidyne did a software/hardware check on it, not necessarily plugging
it into an actual DME unit.
Bob
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Cruiser Quote  Post ReplyReply Direct Link To This Post Posted: 02 Feb 2021 at 2:54pm
if you plug a Garmin 430W back in the tray does it work?
Does the IFD 440 work in a different airplane ? 

Is the NAV1 - NAV2 selector switch working? Pin 22 on both IFDs should go through the switch to pin C on the KN64. Check the continuity of the wiring. 


Edited by Cruiser - 02 Feb 2021 at 3:05pm
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rpostmo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rpostmo Quote  Post ReplyReply Direct Link To This Post Posted: 02 Feb 2021 at 7:11pm
yes,  the avionics shop plugged another 430W back in and it worked normally, 
verifying the wiring from the tray to the KN64 to be all intact and functioning.
I'd like to be able to swap another IFD440 in place, but know of no other ones 
around here.  My shop plugged the 440 into the 540 tray (which provides normal
functioning DME to the KN64) and it did not work (dme function)  otherwise the 
440 works just fine.
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rpostmo View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote rpostmo Quote  Post ReplyReply Direct Link To This Post Posted: 23 Feb 2021 at 10:27am
After extensive bench testing on the oscilloscope, FargoJet found the 
IFD440 wasn't putting out the correct pulses to drive the KN64.  Avidyne 
sent me a new unit and it  worked perfectly when installed.
Bob

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