When trying to power up the amp it draws excessive current .
I checked all outputs and power supply fets they all test fine .
Only thing I noticed is on the power supply fets between gate and source legs I get 47 ohms I think that’s normal for this amp .
Any ideas since I can’t seems to find anything shorted
I checked all outputs and power supply fets they all test fine .
Only thing I noticed is on the power supply fets between gate and source legs I get 47 ohms I think that’s normal for this amp .
Any ideas since I can’t seems to find anything shorted
Does the current draw start IMMEDIATELY after remote is applied or does it take 2-3 seconds for the excessive current draw?
Yes. You should read the gate resistor value.
Yes. You should read the gate resistor value.
I will have to get back to you on that .
Testing a large amp and my power supply broke again .
Blew the transistors that I just replaced
Testing a large amp and my power supply broke again .
Blew the transistors that I just replaced
Did you replace all of them?
Did you confirm that all of the series resistors were within tolerance?
Did you confirm that all of the series resistors were within tolerance?
I replaced them all . And I checked the source resistors . I replaced them again and now my supply is up and running .
Back to the amp .
It takes 2 to 3 secs when applying the remote for the amp to draw current
Back to the amp .
It takes 2 to 3 secs when applying the remote for the amp to draw current
Confirm that the FET that's driving the low-voltage transformer has oscillation on it's tab before the current draw begins.
That would seem to indicate that the problem is in the rail supply.
Check the rectifier
The 4 diodes near the 5w resistor R871
Twist the transformer to see if that makes a difference.
Check the rectifier
The 4 diodes near the 5w resistor R871
Twist the transformer to see if that makes a difference.
The diodes check fine . Tried pulling /twisting the transformer no change .
I pulled the rectifiers and the current draw stopped .
I checked the rectifiers in diode check but they test fine
I pulled the rectifiers and the current draw stopped .
I checked the rectifiers in diode check but they test fine
Shorted secondary PS inductor?
Possible output driver board faults?
Did you check the output FETs carefully?
Possible output driver board faults?
Did you check the output FETs carefully?