The output uses all N channel fets. All 4 are irfp264n's two on the low side and two on the high side.
Ohhh I'm so sorry Perry I just got what you meant and yes i did get the high side reversed the fets are mounted upside down on board so it confused me but the high side fets reads.
G.5.43
D.64.25
S.0.011
G.5.43
D.64.25
S.0.011
Those voltage with the low side you posted earlier seem about right in a generic class D amp. I'm assuming that the low side were reversed as well.
So is it okay that there is 5.43 volts on the gate pads of the high side fets or should I track down where the 5 volts is coming from
The high and low side FETs are being driven by a square wave with a 50% duty cycle. The amplitude is about 10v generally which makes a meter read about 1/2 of that amplitude. That's about 5v. Placing the black probe on the source leg and the red on the gate leg will give you about 5v for high and low side.
Could the lm219 Ic on the driver module cause problems i got a bunch of spares i thought about changing it anyways.
I was hoping that someone with a diagram would help. I'm working from generic knowledge so I can't be of much help.
The DC on the op-amps in the preamp section is odd. The output of IC4 seems to agree with the input so the op-amp looks OK. The high voltage on IC5 is odd. I'd expect it to be near 0v on all inputs and outputs (not referring to thew PS pins).
The DC on the op-amps in the preamp section is odd. The output of IC4 seems to agree with the input so the op-amp looks OK. The high voltage on IC5 is odd. I'd expect it to be near 0v on all inputs and outputs (not referring to thew PS pins).
Ok Perry I appreciate you trying to help me. Maybe Ppalli
Will chime in from other audison post I've read he seems to know quite a bit about these amps. But if anything changes I will post it ASAP thanks again Perry..
Will chime in from other audison post I've read he seems to know quite a bit about these amps. But if anything changes I will post it ASAP thanks again Perry..
Hi,
about IC4 and IC5, as you can see from the diagram, IC5 is a buffer (pin6 and 7 together), so it is impossible that pin7 has a voltage other than pin6
Regarding IC4, if the problem is IC5 or 'before' IC5, the defect propagates to all opamps, including IC4.
My advice is to check the indicated resistors, close to RCA J3 and then remove IC10 and IC6 (input opamp) and check again the voltages on IC5 and IC4
about IC4 and IC5, as you can see from the diagram, IC5 is a buffer (pin6 and 7 together), so it is impossible that pin7 has a voltage other than pin6
Regarding IC4, if the problem is IC5 or 'before' IC5, the defect propagates to all opamps, including IC4.
My advice is to check the indicated resistors, close to RCA J3 and then remove IC10 and IC6 (input opamp) and check again the voltages on IC5 and IC4
Ppalli thanks so much for the feed back and diagram. But the amp seems to be up and running fine I changed all the op amps and the hissing was because I had a 6×9 on the output but after switching to a subwoofer there's no hissing at all and sounds clear as can be. So I think the 6x9 was picking up on switching noise but it's been fine on my sub clean and strong! But I will check those resistors suggested to be on safe side.
Hi, By any chance, does anyone has a schematic of the power supply section of the amplifier SR1DK? I am having power problems and the square wave is not being generated by the IC. Thanks
Please don't post in a repair thread that was started by someone else unless you are trying to help them.
Start a new thread if you need help with a repair of your own.
http://www.bcae1.com/temp/newthreaddiy01.png
Start a new thread if you need help with a repair of your own.
http://www.bcae1.com/temp/newthreaddiy01.png