I have a nad c320bee that’s very poorly,left channel is heavily distorted,right channel has no audio out just breaking up when the volume is up high.
Headphone and pre out both have the distortion,so opened up and one of the 15000uf 50v caps is domed on top but checked out ok on a esr meter.
All power out from the power supply board seem to ok but on the schematic I have should be +-37 but getting +-31
The two sub boards ( CB41-42 i think ,haven’t got the amp or schematics to hand) which I think are protection and pins indicating +-18 but have only +18.
Any one can give me a heads up,I’m usually only deal with guitar amps
Headphone and pre out both have the distortion,so opened up and one of the 15000uf 50v caps is domed on top but checked out ok on a esr meter.
All power out from the power supply board seem to ok but on the schematic I have should be +-37 but getting +-31
The two sub boards ( CB41-42 i think ,haven’t got the amp or schematics to hand) which I think are protection and pins indicating +-18 but have only +18.
Any one can give me a heads up,I’m usually only deal with guitar amps
ESR is usually used to judge the standard of a capacitor in hi-fi but that doesn't always work out other factors have to be taken into consideration and a bulging capacitor is physically telling you something .
Capacitor Lab - Visual Signs of Capacitor Failure - Bulging and Leaking
When you do fault location , I at least work in a logical fashion -if it looks faulty -- I change it , if a resistor had overheated but indicated around the correct ohms would you just leave it or replace it ?
If you just say to yourself --well I will just leave it as that is easier to do then you might be a long time finding the fault.
Capacitor Lab - Visual Signs of Capacitor Failure - Bulging and Leaking
When you do fault location , I at least work in a logical fashion -if it looks faulty -- I change it , if a resistor had overheated but indicated around the correct ohms would you just leave it or replace it ?
If you just say to yourself --well I will just leave it as that is easier to do then you might be a long time finding the fault.
Thanks,normally I would change out suspect caps but these are quite expensive and I don’t want to sink a pile of cash into this without knowing I can repair it under budget
I think you will have to post the power supply section with indicated voltages as the schematics online don't show voltages out from the power supply.
The schematic I have is one I got elsewhere on here
Can’t zoom in enough to read it
https://3.bp.blogspot.com/-SShCymnr...i_-NfJ7H-7wztc_LJm2YACLcB/s1600/power+amp.jpg
Can’t zoom in enough to read it
https://3.bp.blogspot.com/-SShCymnr...i_-NfJ7H-7wztc_LJm2YACLcB/s1600/power+amp.jpg
I can zoom in a bit with a built in Linux app.
Main power supply = 46Volts+/-
Second power supply = 37Volts+/-
I remember this circuit now the last guy I remember found the power switch relay was faulty.
I think it was bad contacts ?
Main power supply = 46Volts+/-
Second power supply = 37Volts+/-
I remember this circuit now the last guy I remember found the power switch relay was faulty.
I think it was bad contacts ?
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Schematics available on Hifiengine
Can´'t upload.
NAD C320BEE Stereo Integrated Amplifier Manual | HiFi Engine
If the -18V rail is missing, that explains a lot.
Can´'t upload.
NAD C320BEE Stereo Integrated Amplifier Manual | HiFi Engine
If the -18V rail is missing, that explains a lot.
I've replaced about 10 pairs of those smoothing caps on the C320 BEE and C320.
They have actual buldged cans, not just a plastic cap flexing. I've had the plastic top off. They usually measure well yet heat up quickly.
I have lots of top quality 15,000uF 50v caps. I can send you them cheaper than suppliers like RS etc. Message me if you're interested. I'm not after earning money from them.
They have actual buldged cans, not just a plastic cap flexing. I've had the plastic top off. They usually measure well yet heat up quickly.
I have lots of top quality 15,000uF 50v caps. I can send you them cheaper than suppliers like RS etc. Message me if you're interested. I'm not after earning money from them.
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