Hello everyone, I am struggling with eqp2000 repair, I bought it as semi-correct because I need one powerful amp and I give up from complete DIY because of the current one project.
The Behringer had several components that missed from the PCB and one working channel and the problematic second one.
In the attachment, I am enclosing a schematic with marked components. Red circles are fault components, crossed out are missed and green circles are changed or parts that I put back.
The symptoms are that channel 1 (R channel) has very distorted sound when the limiter switch is ON, when is OFF I have normal sound from the speaker but only for half a second, then LIMIT turns ON, and after half second with LIMIT ON I have again "normal" sound.
The second channel works okay, I realized that at very low power channel 2 has some small noise when Chanel 1 turns on and off the limiter. The second channel doesn't have DC component or any noise while work (limit switch off)
Somebody before me tried to repair it, but without success obviously. They put el. a capacitor between R-IN1 and NJM1300 pin 15. When I put it back, I get normal sound from that channel (ch 1, R) but with about 4VDC on the speaker.
I tried everything that I know but I am stuck here. Does anybody have some advice?
Thank you in advance.
BR
Alex
The Behringer had several components that missed from the PCB and one working channel and the problematic second one.
In the attachment, I am enclosing a schematic with marked components. Red circles are fault components, crossed out are missed and green circles are changed or parts that I put back.
The symptoms are that channel 1 (R channel) has very distorted sound when the limiter switch is ON, when is OFF I have normal sound from the speaker but only for half a second, then LIMIT turns ON, and after half second with LIMIT ON I have again "normal" sound.
The second channel works okay, I realized that at very low power channel 2 has some small noise when Chanel 1 turns on and off the limiter. The second channel doesn't have DC component or any noise while work (limit switch off)
Somebody before me tried to repair it, but without success obviously. They put el. a capacitor between R-IN1 and NJM1300 pin 15. When I put it back, I get normal sound from that channel (ch 1, R) but with about 4VDC on the speaker.
I tried everything that I know but I am stuck here. Does anybody have some advice?
Thank you in advance.
BR
Alex
