Trace Elliot AH350SMX dcv on output

[sweatyk]

This came to me after frying a few speakers. I measured 55 vdc at the speaker out. In the output circuit I found R13 burnt almost in half. One of the mosfets went belly up so I preceded to replace the K135's and J50's and the burnt resistor. While I had the PCB out I replaced the electrolytic caps on it for GP. I just turned it on and it's measuring 190 Mv dc at the speaker out. A lot lower than the 55 vdc it had before but is this still too much to have here?




GP12 SMX Series 350W Power Amp.pdf

[J M Fahey]

No worry.
We usually expect some 40mV or so, but 190 mV is still acceptable.
I understand it is without speakers, I bet with a real load there it will be better.

[g1]

Where did you find J50 & K135?

[sweatyk]

No worry.
We usually expect some 40mV or so, but 190 mV is still acceptable.
I understand it is without speakers, I bet with a real load there it will be better.

Thanks.....in my mind I had incorrectly figured the 190 MV as 1.9 volts instead of 0.19......

[sweatyk]

Where did you find J50 & K135?

Sorry I wasn't specific. I used the buz900 and buz905 as replacements.