MarkLevinson ML3 schematics ?

[Hardi]

Hello,

i have a defective ML-3 amplifier with many non-riginal parts inside. Someone used wrong resistors and semiconductors in both channels .
A successful repair seems to be impossible without a schematic diagram.
Any ideas how to get it ? Any help will be a appreciated.


Hardi

 

[Tube_Dude]

Hello,

i have a defective ML-3 amplifier with many non-riginal parts inside. Someone used wrong resistors and semiconductors in both channels .

Hi Hardi

Without a schematic, wow do you know that the resistors and the semiconductors are wrong?...

 

[Konrad]

http://home.kimo.com.tw/skychutw/index.html

 

[Hardi]

Hi Tube_Dude,

the guy that tried the repair before soldered some 2N3055 as NPN type transisrors in the output stage. And i know that this is not correct . Some resistors "visually" do not fit in their pcb position...and so on....a real disaster

@Conrad:

I can´t find the ML3 there. Only ML2 and newer 23.5 !?


Hardi

 

[Tube_Dude]

Hi Tube_Dude,

the guy that tried the repair before soldered some 2N3055 as NPN type transisrors in the output stage. And i know that this is not correct . Some resistors "visually" do not fit in their pcb position...and so on....a real disaster

Hi Hardi

Now i see...

For some information about the ML-3 see:

http://marklev.com/

2N3055 for a 200 W amplifier!!!...

 

[john curl]

BAD REPAIR! Danger!

 

[djk]

There are three different ML3 schematics, call the factory with the serial number.

They use MJ15011/12 outputs, 2N3584/2N6421 for predrivers.

 

[Konrad]

Is there a "JC-4" or symetric with/-out j-fets?

 

[JP0400]

Hi Hardi,

I have the same problem with one channel.
Have you obtain finally the schematics ?
Can you send them to me in the case of yes ?

Thanks a lot by advance

Best regards

Jean-Paul

 

[tiefbassuebertr]

BAD REPAIR! Danger!

Why ?? Maybe cause unwanted oscillation effects by certainly load conditions? Then various simulation sessions of this circuit are necessary before starting any aimless service.

http://home.kimo.com.tw/skychutw/index.html

This URL is death in the meantime.
In which case was this URL mentioned? Are there online-schematic of ML-3?
I want to have all schematic versions.

here an auction from CH (Confoederatio Helvetica/Switzerland):
http://www.ricardo.ch/kaufen/audio-...r/endstufen/mark-levinson-ml-3/v/an628135428/
and pics from inside:
http://www.diyaudio.com/forums/swap-meet/148384-mark-levinson-ml-3-excellent-condition.html

 

[R-K Rønningstad]

Did a Service Manual or "set of schematics" pop up eventually, or at least a PDF of the User's Manual?

/RK

 

[audiomagnate]

Did a Service Manual or "set of schematics" pop up eventually, or at least a PDF of the User's Manual?

/RK

Harman doesn't release ML schematics to anyone AKAIK.

 

[R-K Rønningstad]

Well, when they were Madrigal, I got a full set for my ML-2s from them. But that was maybe 1986 - 88. Stone Age!