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Mark Levinson 38 Preamp Schematic
Mark Levinson 38 Preamp Schematic
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Old 5th September 2014, 09:10 AM   #11
willcycle is online now willcycle  United States
diyAudio Member
Join Date: Oct 2003
Location: MD
Thanks for the info. I'll try replacing them.
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Old 11th October 2014, 02:39 PM   #12
willcycle is online now willcycle  United States
diyAudio Member
Join Date: Oct 2003
Location: MD
I completely recapped the unit and it's behaving as I would expect a 380s would with no firmware installed - i.e. all display cells are illuminated and the preamp is non responsive. The 18CV8 PEEL device that has the programming on it has a little burn mark on the center of the sticker (was there before) so it needs replacing. Any ideas where I can get a programmed chip?
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Old 21st September 2021, 07:59 AM   #13
dray177 is offline dray177  France
diyAudio Member
Join Date: Apr 2008
Originally Posted by highviewvideo View Post
I have in the workshop a Mark Levinson 38 preamp with odd fault. There is NO volume control even though the 'numbers in the display' change with rotation of the volume control or with the remote control. The output remains at a fixed level (high).
It does work when 1st turned on so I guess it is out with the freezer spray on the processor/surrounding caps etc.
Anyone experienced this problem?

Alas, my answer comes much too late !!
I think you have to change the ic U2101 : an ILQ2 ( a quad channel optocoupler )
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