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Markbass Little Mark III Head - Cooling Fan Revs High and Low


iPlay5
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Hey everyone,

I've got a Markbass Little Mark III and the cooling fan revs up full blast right when I power it on, then fluctuates down to low, then full blast again - it repeats that pattern the entire time it has power. The amp itself never gets hot.

I've looked inside and don't see anything obvious. I don't think the fan itself has any logic built into it, it seems the speed would be determined from some type of thermal sensor.

If anyone has any ideas, please feel free.

 

Thank you,

iPlay5

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Having replaced a fan once on a 250watt version might it be worth disconnecting the fan, use some switch cleaner and reconnecting?  I think you are right ( from memory) that the fan is just a fan, these are basically just computer fans although I never managed to source one in the UK outside of the authorised repairer.

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  • 2 weeks later...

My LMIII is quiet from start up and even at full gig performance never seems to get very noisy fan wise. It's difficult to tell though when I'm running it into a 4 ohm load at high power and things be shakin' all around. If your fan rev's up to full speed at power on, I would suggest getting it checked out just incase there is something amiss. It may be a symptom of impending doom! 

Screenshot 2022-10-03 at 02.43.41.png

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  • 1 year later...

Hey iPlay5, i have the exact same issue and just replaced with a new fan a few minutes ago....didn't work. I was hoping it was a worn out fan sleeve but problem persist with reving high and low.  Have you managed to fix yours?  Anyone got tips how i can find a schematic or point me to right direction on what might be controlling fan speed?

 

i play a 5 too most the time.

 

Cheers!

Will

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