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Class D Switching Power Amplifiers and Power D/A conversion

UcD180 Repair
UcD180 Repair
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Old 8th November 2006, 10:05 PM   #61
ptwining is offline ptwining  United States
diyAudio Member
Join Date: Feb 2006
Location: east coast
Default I repaired two of the modules today...

I got the 63v 22uf caps from Digikey today and soldered them into two of the modules.

Digikey P/N 493-1121-ND

...if anybody needs that data.

The good news is that both of them fired up and ran perfectly - well, almost...

Both amps trigger the DC protect circuit on the power supply (ST) and shut it down if the DC protect wire is connected from output(+) to the protect lug on the power supply. With out the wires the power supply relay does not trip and the amps run fine.

The protext wires are wired correctly amp1->lug1 / amp2->lug2.

The binding posts are plastic and completely insulated from the chassis and there is no evident short between (+) and (-) on either side.

Why would this happen? Is it dangerous to run this way?

In any case the group knowledge gained here is that it is possible to repair the UcD180 in the case of popped snubbers.

Just to better focus the cause in my particular case I wired the power supply to the amp outputs which popped the caps. It was stupid but appears to be a survivable event.

A muted Yippeee escapes my smiling lips...

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