#### Yoake10

##### New Member

Here is a power circuit board mystery to solve!

For 3 months now I have been trying to repair and error search Harman Kardon 220 sub power circuit board without any luck at all. Therefore I need some more electric minds and brains to solve this problem. I will attach the schematic below with the replaced components and voltage measurements.

Anyone have any idea whats going on?

The problem started with R23 burning out and recitifer bridge BR1 broken. It should be 35 VDC at DN4 and 3,3V DC at CN2.

For 3 months now I have been trying to repair and error search Harman Kardon 220 sub power circuit board without any luck at all. Therefore I need some more electric minds and brains to solve this problem. I will attach the schematic below with the replaced components and voltage measurements.

Anyone have any idea whats going on?

The problem started with R23 burning out and recitifer bridge BR1 broken. It should be 35 VDC at DN4 and 3,3V DC at CN2.

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