MCDU Electrical interference (ground loop)

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OmniAtlas
Posts: 124
Joined: Fri Jul 06, 2012 5:07 am
Location: Australia

MCDU Electrical interference (ground loop)

Post by OmniAtlas »

Hello,

Looks like I may have a ground loop somewhere -- electrical interference on the MCDU.

When I remove one of the 5v supplying one of my pedestal panels the fuzzy lines go away. When I remove the MCDU from the pedestal the fuzzy lines also go away.

Does anyone know how to isolate / eliminate the electrical interference?

Image

Thank you.

Jetcos
Posts: 1273
Joined: Fri Sep 30, 2005 2:42 pm
Location: Newmarket,Ontario
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Post by Jetcos »

You can try and ground the MIP to the Computer. Could be back feeding thru the cables.

Also make sure that any of the VGA and USB cables are not near any electrical wires.
Steve Cos
Vice President and Tech Support
Flightdeck Solutions (FDS)

OmniAtlas
Posts: 124
Joined: Fri Jul 06, 2012 5:07 am
Location: Australia

Post by OmniAtlas »

Jetcos wrote:You can try and ground the MIP to the Computer. Could be back feeding thru the cables.

Also make sure that any of the VGA and USB cables are not near any electrical wires.
Will try and get back to you Steve....I think I may have to rewire the whole backlighting in the pedestal -- right now the VGA and USB cables sit right on top of the FDS backlight distribution board!

Is that usually ok, or do you guys put the backlight board in the A320 MIP?

Cheers.

OmniAtlas
Posts: 124
Joined: Fri Jul 06, 2012 5:07 am
Location: Australia

Post by OmniAtlas »

Update --- well sorted it out, looks like the DZUS rails were all charged up, so grounded it to the computer and all sorted out now.

Thanks, cheers!

OmniAtlas
Posts: 124
Joined: Fri Jul 06, 2012 5:07 am
Location: Australia

Post by OmniAtlas »

Hello -- looks like grounding from the pedestal didn't work as planned because this was shorting out the backlight to the pedestal.

I have determined that when the IBL-DIM slave link is attached from the MIP dimmer board to the pedestal dimmer board I get the flicking of the MCDU, and noisy throttle lever pots.

Removing the slave link (pot control) eliminates the noise.

Does anyone know how to 'ground' this wire, or any suggestions how it can be fixed? Thank you.

1st picture is the MCDU, pedestal and MIP backlight all functioning after removal of the slave pot link.

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