MARKBASS Nano Mark 300 - schematics request

[chrissss1111]

Hi eveybody

Could you have MARKBASS Nano Mark 300 schematics or service manual ?
It's impossible to find it on the web

thx in advance
Chris

[glebert]

Chrissss, I don't have it, and know that Markbass controls their schematics somewhat, but I've worked on a couple and found that they reuse quite of bit of circuit design across models. The circuit designators will be different, but often the mechanisms are the same or similar. On the ones I've worked on the failures tended to be very small things, like a cap that leaked DC or a op amp that just died with no real reason why it would happen.

[chrissss1111]

Chrissss, I don't have it, and know that Markbass controls their schematics somewhat, but I've worked on a couple and found that they reuse quite of bit of circuit design across models. The circuit designators will be different, but often the mechanisms are the same or similar. On the ones I've worked on the failures tended to be very small things, like a cap that leaked DC or a op amp that just died with no real reason why it would happen.

But this is a Class D power amp,
All versions of Little Mark are equipped with a classic Class AB power amp

[glebert]

But this is a Class D power amp,
All versions of Little Mark are equipped with a classic Class AB power amp

Well, do you have the right schematic to share? Or other suggestions?

[Jazz P Bass]

What is wrong with the amp?
If it is an output issue, find the class d chip and look up the datasheet.
Most manufacturers follow the sheet to a T.

[chrissss1111]

What is wrong with the amp?
If it is an output issue, find the class d chip and look up the datasheet.
Most manufacturers follow the sheet to a T.

it is a strange behavior
volume is too low with distortion, sometimes after turn off and on it's ok
it happens accidentally
mostly amp works properly but you'll never know when it might happen
it's a little annoying

[chrissss1111]

Well, do you have the right schematic to share? Or other suggestions?

the problem is that I dont have right schemattics

here are all schematics I found:
https://elektrotanya.com/showresult?...a=All&kat2=All

unfortunately all of them are class AB

[chrissss1111]

it is a strange behavior
volume is too low with distortion, sometimes after turn off and on it's ok
it happens accidentally
mostly amp works properly but you'll never know when it might happen
it's a little annoying

one important thing
the problem occurs only whent I turn on amp,
when amp starts normally is ok, it can work for hours with no problem

[glebert]

Does your bass cab have a piezo tweeter? Class D amps sometimes have stability issues when driving capacitive loads, which is what a piezo will look like IIRC.

[chrissss1111]

Does your bass cab have a piezo tweeter? Class D amps sometimes have stability issues when driving capacitive loads, which is what a piezo will look like IIRC.

Nano Mark 300 is loaded with Markbass New York 122 (2x12", 1" voice coil tweeter, Impedance: 4 Ohms)

http://www.markbass.it/product-detail/new-york-122/