Today's Message Index:
----------------------
1. 06:01 AM - Re: Re: Low Voltage Warning (mike gamble)
2. 08:01 AM - Re: MX20 vertical stripes (Phil Samuelian)
3. 08:19 AM - 757 mic bias voltage (Greg Young)
4. 10:11 AM - Re: 757 mic bias voltage (Robert L. Nuckolls, III)
5. 04:03 PM - Re: WIRE Strippers are back . . . (Jim McBurney)
6. 05:58 PM - Re: MX20 (Angier M. Ames)
7. 06:38 PM - Re: Re: MX20 (Bill Bradburry)
8. 06:41 PM - Re: Re: MX20 (Bob White)
9. 07:00 PM - Re: Re: MX20 (earl_schroeder@juno.com)
Message 1
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Subject: | Re: Low Voltage Warning |
Yes please Eric. I'll take you up on your offer. Would you send me a copy of
the LV light schematic?
Thanks
Mike Gamble
UK Europa builder
Message 2
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Subject: | Re: MX20 vertical stripes |
I too, experienced the vertical stripe problem a few years ago, but
was fortunate that the MX20 was under warranty. I was told by UPS/
Garmin that it was caused by moisture contamination. I am guessing
that on battery power (on the ground) your MX20 is operating at a
lower voltage, and the stripes are not showing up due to reduced
backlighting of the LCD. I am almost 100% sure that the cause is
unrelated to the alternator or other external factors. LCDs have
hundreds of connections surrounding the edge of the glass substrate,
and the behavior of the LCD suggests that there are 1 or more
intermittent connections. As Greg from the 480 group on Yahoo
discovered, smacking the LCD around a bit can fix or at least change
the problem (for better or worse). Smacking it around is not
recommended, because the LCD is a delicate component and can be
permanently damaged. For those that want to attempt a repair and are
willing to accept the possible consequences... There is usually a
rectangular sandwich of alternating metal strips and elastomeric
material that is used to form the connection between the glass and
driver PCB. The ability of this sandwich to connect depends on
cleanliness and pressure. Both must be maintained for proper
operation. Good luck.
On a side note, there are at least 2 versions of the MX20 display. The
original, and an improved version that has faster rendering. If you
send it in for repair, you might get back a better product.
Phil
RV7, C177
On Apr 20, 2009, at 5:42 AM, Ralph E. Capen wrote:
> >
>
> 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 @ N06 10.7hrs in to the fly-off period
Message 3
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Subject: | 757 mic bias voltage |
I've got a friend that flys 757's using a Bose headset and has the mic get
hot (warm) during the course of a flight, not burn-your-lips-hot, but too
hot. Talked to the Bose service mgr here at Sun n Fun and he wants to know
what the mic bias voltage is since a replacement mic didn't fix it. FWIW,
the mic is live continuously because of the CVR. I thought there might be
someone in the brain trust here that might know the answer or have any other
ideas. It's not a problem in GA aircraft - he flew with me to SnF in my
Navion for 5 hrs and had no problem. Likewise none in his GA airplanes.
Regards,
Greg Young
Message 4
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Subject: | Re: 757 mic bias voltage |
At 10:13 AM 4/21/2009, you wrote:
>I've got a friend that flys 757's using a Bose headset and has the
>mic get hot (warm) during the course of a flight, not
>burn-your-lips-hot, but too hot. Talked to the Bose service mgr here
>at Sun n Fun and he wants to know what the mic bias voltage is since
>a replacement mic didn't fix it. FWIW, the mic is live continuously
>because of the CVR. I thought there might be someone in the brain
>trust here that might know the answer or have any other ideas. It's
>not a problem in GA aircraft - he flew with me to SnF in my Navion
>for 5 hrs and had no problem. Likewise none in his GA airplanes.
Don't know what the Bose "ratings" are but in
situations where I've had occasion to put a voltmeter
across an active mic in a TC aircraft, measurement
were always in the 3-5 volt range.
A simple check of his mic while plugged into the
ship's audio system may show a lot more.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 5
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Subject: | Re: WIRE Strippers are back . . . |
Bob,
Don't feel old. I was assisting in a class of young A&P's, in the
electrical unit. I made the comment, "Dikes are good strippers"! You might
guess the looks and comments I got!
Blue skies and tailwinds
Jim
CH-801
DeltaHawk diesel
Augusta GA
90% done, 90% left
Message 6
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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
Message 7
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Pins or sockets may not be seated in the connectors?
B2
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Angier M.
Ames
Sent: Tuesday, April 21, 2009 8:56 PM
Subject: AeroElectric-List: Re: MX20
--> <N4ZQ@comcast.net>
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 8
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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@comcast.net> 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
>
>
>
>
--
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/
Message 9
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---------- Original Message ----------
From: "Angier M. Ames" <N4ZQ@comcast.net>
>in the stack, is gets no power, nothing, zip, nada....
In school we would discretely put a piece of scotch tape in the connector as a
test and baffle our 'buddies'...
Probably not your problem but might be worth checking.. Earl
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