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recapen(at)earthlink.net
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 Posted: Mon Apr 20, 2009 4:43 am Post subject: MX20 vertical stripes |
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Folks,
I am about 11 hours in to my flyoff hours for my RV6A and have found what I think is an alternator-based electrical anomaly.
When I operate my radio stack from battery power (on the ground) - everythings fine.
When I operate my radio stack from alternator power, I get single pixel wide vertical colored stripes on my MX20 display. The stripes don't change with RPM - they just show up when I turn the unit on and annoy me.
I still need to determine if it is the B&C 60 or the B&C SD20 making the stripes appear. I'm guessing that it's the 60 since the 20 is a backup that doesn't kick in while the 60 is running. This should be an easy test though as I have individual control of each alternator.....
I'll verify good grounds and bonds next weekend. I did not install any additional grounds/bonds/shielding other than what was specified in the install manual and wiring diagrams.
I'll be sending this to the Garmin tech support folks to see what they say too - but I'm fairly certain that I can get good scoop here.
Thanks,
Ralph
RV6A N822AR (at) N06 10.7hrs in to the fly-off period
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cjensen(at)dts9000.com
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| Posted: Mon Apr 20, 2009 5:08 am Post subject: MX20 vertical stripes |
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Ralph,
I have the same thing with an MX20. I figured it was a connector problem on the side of the display and totally unrelated to anything else. Mine had gotten progressively worse...more stripes, to the point that I was contemplating upgrading to the MX200...then it went away for a couple week, then a couple stripes came back. I still believe it is a side connector issue, but then I don't know much of anything about it, so don't take my advice to the bank and try to cash it.
I'm just living with it until it gets worse. Curious. What is you hypothesis how the stripes could be related to the regulator or other electrical component?
Chuck Jensen
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recapen(at)earthlink.net
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| Posted: Mon Apr 20, 2009 6:40 am Post subject: MX20 vertical stripes |
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Here's where some of that 'education and recreation' comes in....
What is meant by "across the alternator output"?
Would one leg of the capacitor be attached to the "B" lead (fat output wire) and the other leg to ground for each of the two alternators?
Where would "another one inside the panel" go? Power lead to the affected device and ground?
Thanks,
Ralph
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recapen(at)earthlink.net
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| Posted: Mon Apr 20, 2009 6:41 am Post subject: MX20 vertical stripes |
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Chuck,
No hypothesis on how the effect comes in - I have only seen it with the alternator running and then turning the unit on.
I probably need to try and check it out with either or no alternators producing output - as it could still be generated by ignition.....
Honestly - I don't know....
But I'll let folks know how it ends - when it ends......
Ralph
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