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Mark Levinson 380s PreAmp Schematic needed
Mark Levinson 380s PreAmp Schematic needed
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Old 21st May 2016, 11:01 PM   #11
ammel68 is offline ammel68  United States
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Mark Levinson 380s PreAmp Schematic needed
Quote:
Originally Posted by Hans Polak View Post
Here it is

Hans
Thank you! Since the MAT01 and 02 are still available, I may try to layout a board and see how this buffer circuit sounds.
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Old 22nd May 2016, 05:46 AM   #12
analog_sa is offline analog_sa  Europe
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Mark Levinson 380s PreAmp Schematic needed
Quote:
Originally Posted by mgkman View Post
seemingly random rapid relay clicks and varying odd characters on the display

There is a pretty good chance the processor/rom are cooked and only ML can fix that. Instead of having random technicians poke inside why don't you send it to the factory?

A good technician can reach a diagnosis quickly but a poor one can do plenty of damage. Worth taking the risk?
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Old 22nd May 2016, 10:19 AM   #13
Hans Polak is offline Hans Polak  Netherlands
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Quote:
Originally Posted by analog_sa View Post
There is a pretty good chance the processor/rom are cooked and only ML can fix that. Instead of having random technicians poke inside why don't you send it to the factory?

A good technician can reach a diagnosis quickly but a poor one can do plenty of damage. Worth taking the risk?
A good advice, thatīs the only thing to do that makes sense.

Hans
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Old 22nd May 2016, 12:28 PM   #14
mgkman is offline mgkman  United States
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Thanks for the reply. ML no longer services in house. The three authorized shops in the US all get mixed reviews. So I'm torn on where to send it.
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Old 28th August 2016, 09:03 AM   #15
Hans Polak is offline Hans Polak  Netherlands
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Unfortunately, there was a 15K resistor missing between the two darlingtons.
I have put the model in LTSpice, and here are the results, Bode diagram and distortion figures at 1k, 3k, 10k and 20 kHz.

Bode.jpg

Distortion.jpg

Notice that the 100pF in the previous diagram was adjusted here to 860pF for the best results.
However, components differ a bit, but in the final build version, you will have to twiddle with this cap with the help of a 10kHz square wave to get the best results.

Hans
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Old 8th October 2016, 11:01 AM   #16
jonstanza is offline jonstanza  Portugal
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Quote:
Originally Posted by mgkman View Post
Hello, I am trying to troubleshoot a startup problem on my ML 380s Preamp. Can anyone provide a service manual and/or schematic?
Mgkman...
What is the part of the manual you need?
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Old 27th March 2018, 07:48 AM   #17
sunil_1972 is offline sunil_1972
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could you confirm which series resistor replace in 380s to upgrade
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Old 16th April 2018, 01:41 PM   #18
E300d is offline E300d
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Default Mark Levinson 380 NO audio on the left channel

Hi, I am a new member and I need any one can help me out. I had a Mark Levinson 380 and no audio on the left channel. Please any one out there have the schematic 380, 380s or any ideas can help me out. I really appreciated.

Thanks,
Bruce
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Old 17th April 2018, 02:35 AM   #19
Lbud4 is offline Lbud4  United States
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Default Mark Levinson 380s PreAmp Schematic needed

The schematic for the 38 is easily available. Just search google and you will find it. The 380 is built on the same circuit board. There are a few parts changes — some documented above. I have heard of a similar problem with a 38. In that case one of the 74HC4094 shift registers that control the dac volume control had failed and thus no signal through the dac. I would first verify rail voltage. Have the electrolytic caps been replaced? Next I would follow the signal path from input to output and see where it stops.
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Old 19th April 2018, 10:25 PM   #20
E300d is offline E300d
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Thanks for the information ML38 schematic.
Bruce
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