Re: KLIPSCH KSW-10 amplifier

Just so i get this right , after the bridge we have approx ±30V and they are dropping about 15V on the resistors so the input to the Transistors stage would be ~ ±15V ?

the problem i have is that the SUB doesnt output any sound at all , yet the green(?) led on the panel does turn on when i switch it on , another symptom is that the aoudissy system at my marantz does not recognize the sub-woofer when it is connected .

might you have a basic schematic of such electrical design ? i am not sure i got it all by reading your...

Re: KLIPSCH KSW-10 amplifier

adding few low res pictures of my board , as you can see there are burn signs at the input stage - however i suspect that one of the output transistors is the cause - since i found it shortened - which could explain overloading the input stage.
i will try to replace the output transistors and will update..

but still would be happy to hear any suggestions or insights.

thanks....

Re: KLIPSCH KSW-10 amplifier

how would i know which zener diodes to find (i mean what is the PN) ,
or may be it does not matter ?

Thanks for the help

Re: KLIPSCH KSW-10 amplifier

i have also tested the zener diodes while with power. found -14.8V on D4 and 15.23V on D5..

Re: KLIPSCH KSW-10 amplifier



Hi , there.
i have the same problem , and my PCB looks the same , it look like it was burnt at same place.
so i would follow your advice in order to find out where the problem is..
can you please note where should i check the bridge rectifier ? where to test it with the probes?[LIST][/LIST]i checked the diodes - with the diode test at the fluke , and one shows 0.72V on one polarity and infin on the other , while the second one shows 0.72V on one polarity and aprox. 2.1V on the other.[LIST][/LIST]the opamp IC is not...