Blue Cab 60 combo has 45 volts DC on the output!

[Mike C.]

Hello

I am working on a Blue Cab 60 combo amp that has +45 volts DC
on the speaker outputs. I have replaced the LM3886 output IC. That
did not fix the problem. Both positive and negative supplies are good
and checked clean on a O scope. I do measure a + 44 volts on pin 10
of the IC audio Vin +

Let me know if you have any ideas I should check.

Thanks
Mike C.

 

[Florin]

Hi Mike,

PM sent

 

[Mike C.]

Hello

Thanks for the info. I did email Phillip about the problem. It was just the main output IC module that was the problem. The thing that really threw me when working on the amp was that the new replacement IC module I installed was bad and had the same problem! After replacing it again with another one it works fine. Luck that part is easy to get and inexpensive!

Thanks again
Mike Caldwell

 

[Florin]

This is great, Mike