HS-34 Non-Responsive

dodsond

New Member
Joined
Aug 9, 2006
Messages
76
I have been progressing well with my avionics installation. I have a D-100, HS-34 and D-120. The HS-34 and D-100 harnesses were provided by Approach Fast Stack. My D-120 harness came from Steinair.

3 weeks ago I connected the HS-34 harness to power, ground and the Approach hub. The EFIS provides only serial altitude and DSAB to the hub. The HS-34 interfaces with the hub for audio, DSAB, ARINC, RS232 and marker beacon.

When powered (no EFIS yet) , there were no lights on the HS-34 but a loud static hiss came over the audio until I disconnected the primary connector. I didn't think much about this since I had not yet connected the airframe ground for the audio panel and the D-100 was not powered yet.

Yesterday, I installed the harness for the D-100. I applied power and the EFIS and D-120 booted fine. There were no lights on the HS-34. I also could not get the DSAB to recognize the D-120, the remote compass, or the HS-34. I again disconnected the HS-34 primary connector, and now the DSAB will find the compass and D-120. This was repeatable.

So then, I made a temporary harness for the HS-34 with only 4 pins: power on pin 4, ground on pin 17, DSAB A & B on 3 & 16. I directly connected the DSAB wires to the second pair of DSAB wires in the D-120 harness that came from Steinair. I ran the power and ground right to my busses. Still no lights from the HS-34 and the DSAB would fail on the D-100 and D-120. I tried a DSAB configuration, and the EFIS would find nothing.

Is my HS-34 broken or am I missing something? I have never seen a single indication on the HS-34. The hiss is gone too, but I figured that was because I finished the audio panel grounds.

Doug Dodson
Glasair II-S FT
 

dynonsupport

Dynon Technical Support
Staff member
Joined
Mar 23, 2005
Messages
13,226
Solid troubleshooting job. Sounds like something is up with the HS34. If you connect just power and ground, by the way, it should light up. Call or email tech support at 425-402-0433 or support at dynonavionics dot com about an RMA.
 
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