IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM

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No DME output

Printed From: Avidyne
Category: Avidyne General
Forum Name: IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM
Forum Description: Topics on Avidyne's IFD 5 Series and IFD 4 Series Touch Screen GPS/NAV/COM
URL: http://forums.avidyne.com/forum_posts.asp?TID=2148
Printed Date: 21 Jan 2025 at 11:44pm
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com

Topic: No DME output

Posted By: rpostmo
Subject: No DME output
Date 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

Replies:

Posted By: dmtidler
Date 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".

Posted By: rpostmo
Date 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

Posted By: Cruiser
Date 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.

Posted By: rpostmo
Date 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.

Posted By: rpostmo
Date 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