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Old 19th November 2009, 04:31 PM   #1
cmkc is offline cmkc  Hong Kong
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Default Mark Levinson 336 adjustment problem

wanted ml 336 adjustment manual, due to replace some parts in the driver board, need to fine tune the dirver board trimmer, anyone know?
is the 336 like a 23.5 circuit? or someone know how to adjust 23.5?
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File Type: jpg 336.jpg (136.2 KB, 147 views)
File Type: jpg 23.jpg (58.8 KB, 140 views)
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Old 19th November 2009, 04:42 PM   #2
Mooly is online now Mooly  United Kingdom
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Looking at your circuit I would assume it's used to trim the offset to zero volts DC at the output.

The other obscure alternative is that it's used to minimise distortion by monitoring the output on a distortion analyser... whether that gives an offset error or not.
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Old 19th November 2009, 04:52 PM   #3
cmkc is offline cmkc  Hong Kong
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Hi Mooly,

Thanks for reply, i assume too, it's for dc offset, but the problem is i cannot measure dc in the speaker output, because 336 have a dc servo circuit, so i don't konw its normal or not, anyone know where is the test piont on the dirver board?
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Old 19th November 2009, 05:24 PM   #4
Mooly is online now Mooly  United Kingdom
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Measure here, the circuit as you posted has no servo

Make sure you use the correct ground as we are talking millivolts... use one that the feedback or input components go too.
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File Type: jpg DC Offset.JPG (75.4 KB, 130 views)

Last edited by Mooly; 19th November 2009 at 05:33 PM.
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Old 19th November 2009, 05:51 PM   #5
cmkc is offline cmkc  Hong Kong
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Thanks Mooly, i haven't 336 circuit, this is just 23.5 circuit for compare, i can't find the test piont in 336 ,
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Old 23rd November 2009, 08:24 PM   #6
cmkc is offline cmkc  Hong Kong
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Find out by myself already!
Thanks
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