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N4ZQ(at)comcast.net
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 Posted: Tue Apr 21, 2009 4:58 pm Post subject: MX20 |
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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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bbradburry(at)bellsouth.n
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| Posted: Tue Apr 21, 2009 5:38 pm Post subject: MX20 |
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Pins or sockets may not be seated in the connectors?
B2
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bob(at)bob-white.com
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| Posted: Tue Apr 21, 2009 5:41 pm Post subject: MX20 |
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Hi Angier,
Do a visual check on the pins in the mating 'D' connector. They should
all line up and be the same depth in the socket. Crimp pins can be out
of alignment if they aren't seated correctly, and solder pins can move
around during the soldering process if the cable builder get a little
carried away heating the pins. The plastic gets soft allowing the pin
to move around.
May not be the problem, but worth a check.
Bob W.
On Tue, 21 Apr 2009 20:56:17 -0400
"Angier M. Ames" <N4ZQ(at)comcast.net> wrote:
| Quote: |
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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N93BD - Rotary Powered BD-4 - http://www.bob-white.com
3.8 Hours Total Time and holding
Cables for your rotary installation - http://roblinstores.com/
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earl_schroeder(at)juno.co
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| Posted: Tue Apr 21, 2009 6:00 pm Post subject: MX20 |
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recapen(at)earthlink.net
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| Posted: Wed Apr 22, 2009 4:25 am Post subject: MX20 |
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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.
--
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psamuelian(at)charter.net
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| Posted: Wed Apr 22, 2009 3:10 pm Post subject: MX20 |
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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:
| Quote: |
>
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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http://www.matronics.com/Navigator?AeroElectric-List |
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