Re: Quest QA3004 - suspected blown output stage

You could try using a hair dryer and get rid of the moisture before powering up.

Re: Marantz 1030: Extreme Bias Voltage and Distortion on Left Channel

I would disconnect the speakers (to be safe) and turn down the volume control and start comparing voltages with the working channel. There are just a handful of components to check and it should be quite easy to do that. Pay attention to the transistors H 501-506 and the nearby parts. Also, if you can lift those transistors and check them individually, you should be able to narrow down easily.

Re: Technics SL-3 Turntable

May be you can coat the inside surfaces of the platter with a felt pen (which is easily cleaned) and spin it. If anything is catching, it will leave a mark and you can trace it back.

Re: Infinity PS-12 Powered Subwoofer Fired Amplifier

That is correct. You can Google and there is a ton of info on this. Make sure you are careful to take precautions so that you do not get electrocuted as this involves 110VAC household mains supply. If you are not sure, get it checked out by a qualified person.

Re: NAD C320BEE - Bad capacitors?

This amp is very old and if the caps are the originals, they must have gone over the useful life. That cap on the first image looks bloated which is a bad sign. You may want to replace them altogether. Here is a link to the service manual. You have to make a free account on this site:
[url]https://www.hifiengine.com/manual_library/nad/c320bee.shtml[/url]Re: NAD C320BEE - Bad capacitors?<br... looks bloated

Re: Onkyo SKW-591 subwoofer is dead

Great to hear that the sub is working now. As for the HDMI issue, I think you are more experienced than me. I am yet to try re-flowing the 609 board I discussed on the other forum!

Re: Onkyo SKW-591 subwoofer is dead

If you have a scope, you can take Q502 out of the circuit and compare the output wave forms on Q501 pins 11/14. They should be opposite in phase. If there is any DC across D515 or D516, that is what you will see on the speaker terminals. You will then know which half (LO or HO) of the IC is causing the DC voltage on the speaker terminals.

Re: InterM MA-930 One channel faulty

Try replacing the Zener diode D 116 and see what happens.

Re: Crown Amp DC300A - One channel distirted, other good.

If you say that you may have further damaged by blowing the working channel, do a no load check. By that I mean disconnect the speakers, replace the blown fuses with the correctly rated fuses, switch on the amp and see if you get any DC voltage on the speaker terminals of that channel. If there is DC present (I think it will be!) it means that you have blown output transistors. You could also have the driver transistors blown as well.
You could always check each transistor out of circuit. If you find even 1 of them...