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badgerblog - how to remove a Martin Logan Aerius i back plate
August 20th, 2008
07:54 pm

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how to remove a Martin Logan Aerius i back plate


The nice person at Martin Logan suggested I swap the back plate of the two speakers to determine if I need new electrostatic panels or new back plate/transformer/motherboards.

Summary: I swapped the back plate from the L "bad" speaker to the R"good" speaker", and the electrostatic panel on the R speaker functioned normally with the back plate from the L speaker. So the electrostatic panel on the L speaker is indeed, as previously assumed, bad. New pair of panels ordered.

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PROCEDURE FOR AERIUS i CROSSOVER/POWER SUPPLY MODULES OR REMOVAL FOR SERVICE

REQUIRED TOOLS:
PHILLIPS SCREW DRIVER
SMALL SLOT SCREW DRIVER (1/8th " or less)


PROCEDURE:

1. Un-plug A.C. Power cord from speaker. Turn off amplifier. Disconnect speaker cables from the rear of the speaker. In order to discharge the HV power supply before opening the speaker, simply leave the speaker unplugged for 4 or 5 hours. It will discharge any remaining static charge in that period of time.





2. Remove the 10 Phillips screws securing the back-plate of the speaker. Gently tug at the binding post to remove the back-plate from the rear of the woofer cabinet.




3. Note the location and colors of the few various wires which are still attached to the speaker for later reference. Make a sketch if necessary to remember how to hook everything up later.






4. Using the slot screw driver, loosen the screws securing the braided 3 or 4 wires (red, blue, blue, black). The wires should easily release.




5. Locate the ends of the RED and BLACK woofer wires on the woofer itself. They are a push-on type connector. Note the marking directly on the woofer indicating the positive (+) terminal for later reference. Pull the push-on connectors free.





6. If your speaker has an indicator light on the front, there will also be two very small wires that go to a screw terminal on the circuit board. Loosen the two screws to release.

The back-plate should now be free to swap for diagnostics or to ship for service.

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The screw holding the red wire on the R "good" speaker was stuck and I had to clip the wire, but barring the now-disconnected status light on the R speaker, everything is working just as it was before I started dismantling the speakers this evening.

Current Music: something I wasn't paying attention to
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[User Picture]
From:penelopesque
Date:August 21st, 2008 12:29 am (UTC)
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I miss the days when it was all about the red and blue wires.
[User Picture]
From:badger
Date:August 21st, 2008 12:47 am (UTC)
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Given the phrase "red and blue wires" evokes the context of "bombs" for me, I honestly don't. But I thought the pictures were pretty :).
[User Picture]
From:shadowsandice
Date:August 21st, 2008 08:39 am (UTC)
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I find circuit boards fascinating. They're little cities that I can't get into.
[User Picture]
From:badger
Date:August 21st, 2008 12:44 pm (UTC)
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That analogy works for me.
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