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MAC 3 LED Trim Indicator...

 
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Matt Dralle
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Joined: 08 Nov 2005
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Location: Livermore CA USA

PostPosted: Sat Feb 16, 2019 4:29 pm    Post subject: MAC 3 LED Trim Indicator... Reply with quote

Hello,

A fellow homebuilder friend of mine has a old-style three-LED (Red|Green|Red) MAC Trim Position Indicator. The Green LED was burned out, and the wires were cut off too short.

I told him I would try to replace the LED and lead wires. I got it apart without completely destroying it. But the internal wiring and polarity of the LEDs isn't that clear to me, nor is the actuation of it through a servo electronically. I'm not sure how to activate three LEDs with only three wires? (Or did there used to be four wires?)

Does anyone have a PDF schematic of the 3-LED MAC Trim Indicator that you could email to me?

Or better yet, does anyone have a spare or unused one of these they would like to sell me?

Thank you,

Matt Dralle




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PostPosted: Sat Feb 16, 2019 5:00 pm    Post subject: MAC 3 LED Trim Indicator... Reply with quote

On 2/16/2019 6:27 PM, Matt Dralle wrote:

Quote:

Hello,

A fellow homebuilder friend of mine has a old-style three-LED (Red|Green|Red) MAC Trim Position Indicator.  The Green LED was burned out, and the wires were cut off too short.

I told him I would try to replace the LED and lead wires.  I got it apart without completely destroying it.  But the internal wiring and polarity of the LEDs isn't that clear to me, nor is the actuation of it through a servo electronically. I'm not sure how to activate three LEDs with only three wires? (Or did there used to be four wires?)

Does anyone have a PDF schematic of the 3-LED MAC Trim Indicator that you could email to me?

Or better yet, does anyone have a spare or unused one of these they would like to sell me?

Thank you,

Matt Dralle
Is it accessible enough to clip-lead the LED in for testing? If so, just pick a direction. If it works, you're done. If it doesn't, reverse the leads. Assuming that the current limiting is done external to the LED itself, it won't matter if you insert it backward; it just won't light up.

Charlie
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PostPosted: Sun Feb 17, 2019 6:45 am    Post subject: MAC 3 LED Trim Indicator... Reply with quote

Matt, why not supply us with a close up photo or two? Often, the LED polarity can be identified by a difference in the legs of the LED. If the leads are to short to extend, could you de-solder them [one at a time] from the board and solder in new leads?

Charlie

On Sunday, February 17, 2019, 1:15:39 AM UTC, Charlie England <ceengland7(at)gmail.com> wrote:




On 2/16/2019 6:27 PM, Matt Dralle wrote:

Quote:

Hello,

A fellow homebuilder friend of mine has a old-style three-LED (Red|Green|Red) MAC Trim Position Indicator. The Green LED was burned out, and the wires were cut off too short.

I told him I would try to replace the LED and lead wires. I got it apart without completely destroying it.  But the internal wiring and polarity of the LEDs isn't that clear to me, nor is the actuation of it through a servo electronically. I'm not sure how to activate three LEDs with only three wires? (Or did there used to be four wires?)

Does anyone have a PDF schematic of the 3-LED MAC Trim Indicator that you could email to me?

Or better yet, does anyone have a spare or unused one of these they would like to sell me?

Thank you,

Matt Dralle
Is it accessible enough to clip-lead the LED in for testing? If so, just pick a direction. If it works, you're done. If it doesn't, reverse the leads. Assuming that the current limiting is done external to the LED itself, it won't matter if you insert it backward; it just won't light up.

Charlie

Virus-free. www.avast.com [url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2] [/url]


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