Mark Levinson 336 adjustment problem

cmkc · 19th November 2009, 04:31 PM

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?

Mooly · 19th November 2009, 04:42 PM

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.

cmkc · 19th November 2009, 04:52 PM

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?

Mooly · 05:33 PM

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.

cmkc · 19th November 2009, 05:51 PM

Thanks Mooly, i haven't 336 circuit, this is just 23.5 circuit for compare, i can't find the test piont in 336 ,

cmkc · 23rd November 2009, 08:24 PM

Find out by myself already!
Thanks

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19th November 2009, 04:42 PM	#2
Mooly diyAudio Moderator Join Date: Sep 2007	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.

19th November 2009, 04:52 PM	#3
cmkc diyAudio Member Join Date: Jan 2009	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?

19th November 2009, 05:51 PM	#5
cmkc diyAudio Member Join Date: Jan 2009	Thanks Mooly, i haven't 336 circuit, this is just 23.5 circuit for compare, i can't find the test piont in 336 ,

23rd November 2009, 08:24 PM	#6
cmkc diyAudio Member Join Date: Jan 2009	Find out by myself already! Thanks