Hi guys.
I pulled my Adcom GFA-555 out to play with and noticed a funny smell when it was on. I popped the cover and noticed the PCB on top of one of the caps looks burnt. I measured the temp from the top of the board at 160f. All the others were around 105f. Specifically it is the resistor running to the power LED that is running hot. If I disconnect it the temperature is normal. I swapped in another LED of questionable pedigree and the temp went back up.
Voltage at the main caps is 82v. Bias is 13.3mv cold. DC offset is .005v. It sounds fine.
Is it normal for this resistor to run hot or do I have a problem?
Thanks.
Ashley...
I pulled my Adcom GFA-555 out to play with and noticed a funny smell when it was on. I popped the cover and noticed the PCB on top of one of the caps looks burnt. I measured the temp from the top of the board at 160f. All the others were around 105f. Specifically it is the resistor running to the power LED that is running hot. If I disconnect it the temperature is normal. I swapped in another LED of questionable pedigree and the temp went back up.
Voltage at the main caps is 82v. Bias is 13.3mv cold. DC offset is .005v. It sounds fine.
Is it normal for this resistor to run hot or do I have a problem?
Thanks.
Ashley...