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08-23-2016, 07:22 PM
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Join Date: Jan 2005
Location: Martinsville, IN
Posts: 2,326
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Electrical failure trim circuit
While doing my run up, I detected the faint smell of escaping electrons for a brief moment. My first thought was the regulator again. A quick check of the gauges didn't reveal any anomalies so I departed. Once airborne I quickly discovered that the trim wouldn't work. As luck would have it, guess which fuse is the only one that doesn't light up when blown? Yep the 2amp trim circuit.
The fact that I could smell electrons leads me to think there's a short behind the panel. I'll tear into it tomorrow. Anyone else experience a similar problem?
__________________
Randy Pflanzer
Greenwood, IN
www.pflanzer-aviation.com
Paid through 2043!
Lund fishing Boat, 2017, GONE FISHING
RV-12 - Completed 2014, Sold
427 Shelby Cobra - Completed 2012, Sold
F1 EVO - partially completed, Sold
F1 Rocket - Completed 2005, Sold
RV-7A - Partially completed, Sold
RV-6 - Completed 2000, Sold
Long-EZ - Completed 1987, Sold
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08-23-2016, 08:35 PM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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It sounds like an electronic component on Van's control board went up in smoke. Do you have the D-180 or SkyView?
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Joe Gores
RV-12 Flying
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08-24-2016, 05:43 AM
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Join Date: Jan 2005
Location: Martinsville, IN
Posts: 2,326
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I have the Skyview.
I suspect the switch module as well. It is very difficult to get out I discovered this morning. Basically it has to come out the front of the panel because it sits in front of the panel braces. Unfortunately that means removing the throttle and other cables as well. This is turning into a big deal now.
I guess it's a good time to swap out the old throttle for the vernier one.
__________________
Randy Pflanzer
Greenwood, IN
www.pflanzer-aviation.com
Paid through 2043!
Lund fishing Boat, 2017, GONE FISHING
RV-12 - Completed 2014, Sold
427 Shelby Cobra - Completed 2012, Sold
F1 EVO - partially completed, Sold
F1 Rocket - Completed 2005, Sold
RV-7A - Partially completed, Sold
RV-6 - Completed 2000, Sold
Long-EZ - Completed 1987, Sold
Last edited by f1rocket : 08-24-2016 at 08:15 AM.
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08-24-2016, 07:08 PM
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Join Date: Apr 2010
Location: Tucson, AZ
Posts: 461
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Quote:
Originally Posted by f1rocket
I have the Skyview.
I suspect the switch module as well. It is very difficult to get out I discovered this morning. Basically it has to come out the front of the panel because it sits in front of the panel braces. Unfortunately that means removing the throttle and other cables as well. This is turning into a big deal now.
I guess it's a good time to swap out the old throttle for the vernier one.
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I don't think it's on the switch panel. There is really only heavy duty stuff on that doesn't just burn up without blowing a fuse. My guess is that the black box which contains the electronic to convert your switch input for trim up/down into PWM pulses burnt out. That's where I would look first, probably by looking at the trim lines and see if there are any pulses and if they change pattern when the trim switch is actuated.
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08-25-2016, 06:13 AM
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Join Date: Jan 2005
Location: Martinsville, IN
Posts: 2,326
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I'm confused. The fuse is blown and shorts immediately. I'm not sure what you are suggesting I check. Can you explain a little more? Thanks Torsten.
__________________
Randy Pflanzer
Greenwood, IN
www.pflanzer-aviation.com
Paid through 2043!
Lund fishing Boat, 2017, GONE FISHING
RV-12 - Completed 2014, Sold
427 Shelby Cobra - Completed 2012, Sold
F1 EVO - partially completed, Sold
F1 Rocket - Completed 2005, Sold
RV-7A - Partially completed, Sold
RV-6 - Completed 2000, Sold
Long-EZ - Completed 1987, Sold
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08-25-2016, 07:18 AM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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It is highly unlikely that the problem is within the AV-50001 SWITCH & FUSE MODULE. Just to make sure, disconnect the SWITCH D-Sub connector from the AV-50000A CONTROL MODULE, then see if the fuse blows. If not, reconnect the D-Sub connector.
It is more likely that the problem is within the AV-50000A CONTROL MODULE or the wires that go to the trim servo or the servo itself. To rule out the trim servo or its supply wires, disconnect the FUSELAGE D-Sub connector from the AV-50000A CONTROL MODULE. Now see if the fuse blows. If it does, the problem is within the AV-50000A CONTROL MODULE.
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Joe Gores
RV-12 Flying
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08-25-2016, 07:22 AM
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Join Date: Jan 2005
Location: Martinsville, IN
Posts: 2,326
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Thank you so much. In the hangar right now. I'll give it a go and report back in a few.
I pulled the switch d-sub but not sure it tested anything since there is no power going thru it so obviously, the fuse didn't blow. I reconnected it and pulled the fuselage d-sub and the fuse blew immediately.
So I can conclude its not the trim motor or fuselage wiring. What wires can I check going to the switch d- sub to determine if the control box is bad or some other component?
__________________
Randy Pflanzer
Greenwood, IN
www.pflanzer-aviation.com
Paid through 2043!
Lund fishing Boat, 2017, GONE FISHING
RV-12 - Completed 2014, Sold
427 Shelby Cobra - Completed 2012, Sold
F1 EVO - partially completed, Sold
F1 Rocket - Completed 2005, Sold
RV-7A - Partially completed, Sold
RV-6 - Completed 2000, Sold
Long-EZ - Completed 1987, Sold
Last edited by f1rocket : 08-25-2016 at 07:38 AM.
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08-25-2016, 08:04 AM
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Join Date: Jan 2005
Location: Martinsville, IN
Posts: 2,326
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The wiring diagram shows a trim speed controller. I assume it's built into the AV-50000A Control Module? Is that something that can be replaced without replacing the whole box? Have others had to replace the entire box before?
__________________
Randy Pflanzer
Greenwood, IN
www.pflanzer-aviation.com
Paid through 2043!
Lund fishing Boat, 2017, GONE FISHING
RV-12 - Completed 2014, Sold
427 Shelby Cobra - Completed 2012, Sold
F1 EVO - partially completed, Sold
F1 Rocket - Completed 2005, Sold
RV-7A - Partially completed, Sold
RV-6 - Completed 2000, Sold
Long-EZ - Completed 1987, Sold
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08-25-2016, 08:18 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Do another check with the harness D-sub connected at the AV-50001 switch module but disconnected at the AV-50000 end (the switches D-sub connector).
If the fuse still blows then you have isolated it to a problem in that harness.
If it does not blow, then the problem is likely in the AV-50000.
It can be repaired.
If that looks like the problem, contact someone in tech. support and refer them to this thread to confirm what troubleshooting you have done, and then they will give you details regarding how to send it in for repair.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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08-25-2016, 09:00 AM
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Join Date: Jan 2005
Location: Martinsville, IN
Posts: 2,326
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Thanks Scott. Will do.
__________________
Randy Pflanzer
Greenwood, IN
www.pflanzer-aviation.com
Paid through 2043!
Lund fishing Boat, 2017, GONE FISHING
RV-12 - Completed 2014, Sold
427 Shelby Cobra - Completed 2012, Sold
F1 EVO - partially completed, Sold
F1 Rocket - Completed 2005, Sold
RV-7A - Partially completed, Sold
RV-6 - Completed 2000, Sold
Long-EZ - Completed 1987, Sold
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