Mark Bass Little Mark III Blowing Fuse

[x-pro]

Praise the Gods

[misterc57]

So good to say the issue is due to bad T22 T23?

[x-pro]

The probability of this is high. It is necessary to check their correctness on the device.
Then check the operation of the PWM generator. How to do it, I pointed to the link earlier.

[misterc57]

New T22 T23 arriving next week.

[misterc57]

Installed new T22 T23 and problem is still there. Going to give back to my friend as I have exhausted my efforts on this. Thank you all!

[x-pro]

You should have read the thread at the link. It describes how to check the PWM generator on IC5. Replacing transistors T22 and T23 does not always give a positive result in repair.