Today's Message Index:
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1. 05:25 AM - Re: Re: MX20 (Ralph E. Capen)
2. 04:10 PM - Re: Re: MX20 (Phil Samuelian)
Message 1
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I would make sure that power and ground are available to the correct pins with
the unit out of the chassis. Then verify that the unit goes in completely when
you insert and tighten the security screw....then verify that the connections
are made when the unit is fully seated-you might be able to reach behind with
a mirror or jiggle the connector to verify integrity.
-----Original Message-----
>From: "Angier M. Ames" <N4ZQ@comcast.net>
>Sent: Apr 21, 2009 8:56 PM
>To: aeroelectric-list@matronics.com
>Subject: AeroElectric-List: Re: MX20
>
>
>Interesting that the Apollo MX20 is a current subject of discussion
>here. I have a wiring problem in my Lancair avionics stack which so
>far defies a solution. 14 volts is applied to the MX20 through pins 1
>&16 and ground through pins 2 & 20 on the 37 pin Dsub connector J1.
>The only other connections on J1 are RS232 data lines. On the bench
>and with power & ground connected, the MX20 functions normally. In
>the avionics stack there is a GX60, SL30, SL70 and they all function
>and talk to each other correctly. At the back of the MX20 chassis,
>sockets 1 & 16 and 2 & 20 have correct polarity and 12.8 volts. The
>problem is simply that when the MX20 is seated normally in its chassis
>in the stack, is gets no power, nothing, zip, nada....
>
>If I remove the MX20 from the stack and set it on the wing and connect
>3' jumpers between the pins on the MX20 and the sockets at the rear of
>the chassis, the MX 20 powers up normally.
>
>For the moment, I'm completely stumped.
>
>Angier Ames
>N4ZQ
>
>
Message 2
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You might verify that the 2 nuts that hold the D-sub connector at the
back of the tray are still in service. If 1 falls off or is loose the
connector can be pushed back as the MX20 is inserted and the
connectors won't mate. The unit is designed so the connector shell
will wiggle left and right for self-alignment when mated. It should
not move forward or backward at all.
On Apr 21, 2009, at 5:56 PM, Angier M. Ames wrote:
> >
>
> Interesting that the Apollo MX20 is a current subject of discussion
> here. I have a wiring problem in my Lancair avionics stack which so
> far defies a solution. 14 volts is applied to the MX20 through pins
> 1 &16 and ground through pins 2 & 20 on the 37 pin Dsub connector
> J1. The only other connections on J1 are RS232 data lines. On the
> bench and with power & ground connected, the MX20 functions
> normally. In the avionics stack there is a GX60, SL30, SL70 and
> they all function and talk to each other correctly. At the back of
> the MX20 chassis, sockets 1 & 16 and 2 & 20 have correct polarity
> and 12.8 volts. The problem is simply that when the MX20 is seated
> normally in its chassis in the stack, is gets no power, nothing,
> zip, nada....
>
> If I remove the MX20 from the stack and set it on the wing and
> connect 3' jumpers between the pins on the MX20 and the sockets at
> the rear of the chassis, the MX 20 powers up normally.
>
> For the moment, I'm completely stumped.
>
> Angier Ames
> N4ZQ
>
>
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