Power rockford bd 1000 problem

[Feryspeed]

Hello friend. where I found a problem with power rockford bd1000. the conditions are sometimes protective or not sometimes. This power makes no sound. but high noise occurs. if what needs to be fixed

 

[Perry Babin]

U21 commonly fails and causes the amp to remain in protect. There may be a point where it sometimes works normally and sometimes doesn't.

You would need to explain precisely when the noise occurs and where it's coming from.

 

[Feryspeed]

U21 commonly fails and causes the amp to remain in protect. There may be a point where it sometimes works normally and sometimes doesn't.

You would need to explain precisely when the noise occurs and where it's coming from.

 

[Feryspeed]

noise Occurred continuously since the beginning is turned on, his voice is very loud, leaves the speaker back and forth loud and sometimes hoarse.
but the led protection is off.

Is it only by replacing U21?

 

[seankane]

I would start by replacing U21.


These amp tend to whine or ring from the toroid, epoxy or silicone will fix that.


If the noise is coming from the speaker when hooked up, check pins 1 and 7 on all the op-amps (TL072C) in the input stage. There shouldn't be any dc on these pins.


Is there any DC voltage on the output terminals?

 

[Feryspeed]

when the position is turned on the output has a little voltage sometimes high sometimes low.
what is the cause?

 

[Perry Babin]

'Little' isn't very descriptive.

AC or DC?

Magnitude?

Viewed on scope or measured with multimeter?

Is the problem affected by touching any of the output filter components? Inductors can have intermittent connections and the capacitors can have broken leads.

 

[Feryspeed]

the outflow current is ac. around 5 -50 volts. I measured with a multimeter.
when touching the capacitor / inductor does not affect anything.