I don't know what to do.
The amp only turns on after a few tries after being pluged in, but once it turns on it will work fine and then i can turn it off and on and it will work as intended untill i unplug it for a random amount of time, and then it goes back to not turning on.
If i remove the cover to try to find the problem, the amp turns on no problem even if left overnight, so the problem goes away
Any ideas on what could be wrong?
Attached is the power supply section of the amp
If i understand the circuit correctly
the switch turns on mains via a inducter to the main rectifier and capacitors via two inrush limiting resistors. Before the rectifier power is bypassed to transformer T101 that feeds a 7815 voltage stabilizer that powers a IR2153 half bridge driver that drives T104 so that it will provide all voltages needed by the amp and turn on the power relay to bypass the two inrush protection resistors.
The amp only turns on after a few tries after being pluged in, but once it turns on it will work fine and then i can turn it off and on and it will work as intended untill i unplug it for a random amount of time, and then it goes back to not turning on.
If i remove the cover to try to find the problem, the amp turns on no problem even if left overnight, so the problem goes away
Any ideas on what could be wrong?
Attached is the power supply section of the amp
If i understand the circuit correctly
the switch turns on mains via a inducter to the main rectifier and capacitors via two inrush limiting resistors. Before the rectifier power is bypassed to transformer T101 that feeds a 7815 voltage stabilizer that powers a IR2153 half bridge driver that drives T104 so that it will provide all voltages needed by the amp and turn on the power relay to bypass the two inrush protection resistors.
Managed to open the amp with the fault present.
Ic101 is providing the 15v to the IR2153
Pin2 RT is also close to 15V
Pin3 CT is close to 0V so Q101 is fully conducting and putting the controller on shutdown
When the amp is working voltages on pin2 an pin3 of IR2153 are around 7.5V
Now to figure out why !!!!
Ic101 is providing the 15v to the IR2153
Pin2 RT is also close to 15V
Pin3 CT is close to 0V so Q101 is fully conducting and putting the controller on shutdown
When the amp is working voltages on pin2 an pin3 of IR2153 are around 7.5V
Now to figure out why !!!!