I can do that.
Audio IN ground is connected to the pad IN-
I'll post a picture later today. Thanks everyone for the help!
Sorry I missed the last question. I am not sure if they were connected to the same wall outlet. Same house circuit but could have been a different outlet.
Additionally the boards are currently out of the chassis and the F6's are in place so I will need some time to swap boards for further troubleshooting.
Thanks again for the help Ill post back when I have the AJ running.
In case you maybe haven't done so already, IN- should also be connected to GND directly on the PCB.
Regards,
Claas
Strong Noise
Hello all !!
I need your experice for try to solve a problem. As you know, I build an Alepj J some months ago, and I'm very very happy with it, but yestarday, like other day, I use the power amp for about 3-4 hours without any problem.
Today when I turn on, on left chanel, sound a strong noise, not much high, not much low, where do you recommend start to revise each per each component ?? Any similiar problem.
Thanks for your help.
Hello all !!
I need your experice for try to solve a problem. As you know, I build an Alepj J some months ago, and I'm very very happy with it, but yestarday, like other day, I use the power amp for about 3-4 hours without any problem.
Today when I turn on, on left chanel, sound a strong noise, not much high, not much low, where do you recommend start to revise each per each component ?? Any similiar problem.
Thanks for your help.
first try to look for any suspicious connection - wires etc.
after that , any suspicious solder point
after that, some measurements, but only after you post some pics, so we can see how you arranged several positions with optional parts placement
after that , any suspicious solder point
after that, some measurements, but only after you post some pics, so we can see how you arranged several positions with optional parts placement
Check for wiring/soldering issues to start as ZM suggested. I had a loud buzzing channel in an F6 build
after a few months use and it was a cold solder joint at the binding post.
after a few months use and it was a cold solder joint at the binding post.
I can't tell if you're using any standoffs. Is the clearance between heatsink and pcb and all wiring and parts ok?
I can't see any goo between mosfet and mica, but if you say it's there, then OK
with inputs shorted- can you measure output DC offset , and voltage across all 4 mosfet source resistors?
with inputs shorted- can you measure output DC offset , and voltage across all 4 mosfet source resistors?
I check all weldings and seems right.
When I turn on the power amp the Offset are in 0 but start to decrease to negative polarity While warming in 1 minute go to -1.9volts when I turn off the power amp, the Offset measure change polarity and go to 0 again..... the Offset resistor seems Works well because I can adjust it to 0 again, but are continously decreasing when is warming....
R18 - 0.39V R - 19 - 0.42V R - 16 - 0.41 R - 17 - 0.41V
When I turn on the power amp the Offset are in 0 but start to decrease to negative polarity While warming in 1 minute go to -1.9volts when I turn off the power amp, the Offset measure change polarity and go to 0 again..... the Offset resistor seems Works well because I can adjust it to 0 again, but are continously decreasing when is warming....
R18 - 0.39V R - 19 - 0.42V R - 16 - 0.41 R - 17 - 0.41V
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After turn crazy, and compare both pcb's, I think the problem can be from LSJ 74, what do you think ? Because without any rca conected R18-19-16-17 in the right chanel I measure 0 volts so.it's ok but on the ring chanel left, I measure 0.4v more or less in all resistors....
I think have sense.
I think have sense.