REFLECTOR: Elevator trim problem

[Michael Watson]

John,

I also have a Mac 7 stick. Last year I had a problem with an intermittent
up button.
I called Mac and they sent me two new buttons to replace the up and down
ones.
No problems since. I think your up button may be sticking. Unscrew the two
screws
under the head four or five turns, twist the head left to right while
pressing the up button
and see if it sticks. Find a position that it moves up and down smoothly
then tighten the
screws.




On Thu, Jan 12, 2012 at 10:15 AM, John Dibble <aminetech at bluefrog.com>wrote:

> While we're on this subject, I need help with an issue with my elevator
> trim.  Over the past 100 hours, infrequently it seems to trim up
> uncommanded.  I push forward on the stick to keep level and push the
> trim down button.  For a second or two nothing happens.  Then it
> responds properly.  I know if I press both buttons at once, nothing
> happens, so I'm guessing that there is still an up input in the second
> or two when nothing happens.  I have a solid state relay that failed
> once.  In that case the output voltage reduced to where the motor
> wouldn't run.  I have a Mac 7 stick.  On the ground the buttons operate
> well with no sign of sticking.  I have several questions.
>
> Where is the mechanism that prevents operation when both buttons are
> pressed?  In the stick?  In the relay?  In the motor?
>
> Can I eliminate the relay and run full current through the stick?
>
> I may wire lights to the leads going to the motor so I can confirm when
> current is being sent to the motor.
>
> Thanks,
>
> John
>
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-- 
Mike W.
1997 Velocity Elite RG
Franklin /IVO Electric CS
Dual GRT EFIS HX Synthetic Vision
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