Martin Logan Aerius i HT Board Transformer Kaputt !? - Page 2 - diyAudio
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Old 26th September 2013, 11:47 PM   #11
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The original transformer supplies both 260VAC to the bias supply and ~11VAC to the music sensor turn-on circuit, and is soldered to the pcb, so finding an exact replacement is unlikely. But I expect if push came to shove, the separate voltages could be obtained from other suitable transformers mounted off-board. I would want the L and R speakers to have the same 'update' for my own sanity.
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Old 26th September 2013, 11:55 PM   #12
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Alan, definitely take bolserst up on his offer to order transformers from ML. (Get two, as the other side is the same age.)
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Old 27th September 2013, 04:25 PM   #13
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thanks for all the help guys, a couple of pm's sent :->
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Old 28th September 2013, 11:13 AM   #14
diceman is offline diceman  United Kingdom
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If the transformer has 2 windings and one being for the auto power up the regular aerius boards I have are unlikely to be suited as they did not feature the auto power up at all.
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Old 28th September 2013, 02:05 PM   #15
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Quote:
Originally Posted by diceman View Post
If the transformer has 2 windings and one being for the auto power up the regular aerius boards I have are unlikely to be suited as they did not feature the auto power up at all.
Not sure about the question - will check later.
I am note sure if my speakers have auto on ?

What is the part no of the boards you have ?

Maybe someone here can advise on Aerius v Aerius i ?
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Old 28th September 2013, 02:42 PM   #16
diceman is offline diceman  United Kingdom
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Board no. MLPS-102

Pic :- Click the image to open in full size.
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Old 29th September 2013, 10:16 PM   #17
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Quote:
Originally Posted by diceman View Post
If the transformer has 2 windings and one being for the auto power up the regular aerius boards I have are unlikely to be suited as they did not feature the auto power up at all.
Your board does appear to have the auto on-off circuit.
Schematic and board pic was posted here for the SL3 which looks very similar to yours.

ML SL3 intermittent bias supply problem
Attached Images
File Type: jpg MLPS-102.jpg (157.9 KB, 70 views)
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Old 30th September 2013, 10:04 PM   #18
diceman is offline diceman  United Kingdom
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Hmm,
Interesting - These were just badged as Aerius and not "I" although they are a late pair of Aerius.
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Old 7th October 2013, 08:28 PM   #19
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UPDATE:

Now have an older MLPS-102 from an Aerius and have connected it in place of the MLPS103 rev h on my Aerius i

Problem is the connections to the X-OVER transformer are not the same on both.
On the 103 there are 4 wires to 4 different PCB terminals, on the 102 there are only 2 wires and only 2 terminals to connect to.

On the 103 3 of the 4 are actually connected together via PCB track which is not connected to anything else on the PCB and the other is connected to a series of 15Mohm resistors.
On the 102 one wire also connects to the 15M resistors but the other is connected via a 15M resistor and then ground.

My first instinct was to simply connect the 3 wires from the 103 together into the one terminal that goes to the 15M resistor but I am worried I might damage the board.

Will post pics soon to be clearer.

Any initial thoughts ?

PS
The transformer has exactly the same readings on both 103 and 102 boards so don't think that's my problem any more that's why I switched the whole board.

Last edited by alaneglinton; 7th October 2013 at 08:57 PM.
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Old 7th October 2013, 09:21 PM   #20
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The other difference of note is that on the 102 the mains power has a ground cable connected but on the 103 it does not
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