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The inputs may be assignable on the Harman Kardon. Make sure you have selected the proper analog or digital input type for the cable you are using. For more information, or should you have further questions, please visit my website at audioserviceclinic.com. You may contact me directly through the website. Thank you.
Usually Humming noises come from frequency interferance. In this case it is being caused by your input sources. A smiply solution is to replace the cables and or seperate the source cables away from any electircal cords or sources.
I got the answer for No-1.
The balance was turned on the Right Channel. That is why Left Channel was not working during the Channel test.
For Channel test the Balance should be in the middle so that both Right and Left Would be heard.
I am working on my Subwoofer Isuue.
I opened the Back Panel and Yet I could ot figure out any issues.
I will open the front panel and see if any connection is loose.
Try hooking up a yellow video wire from the back of the AVR 225 Monitor out. Should be at the end of the 7 or 8 yellow video ports on the back of the stereo. Next plug the other end into a yellow video in on a t.v. Get your remote, (Harmon/Kardon) and make sure the t.v. is on the correct video input and hit the OSD(on screen display) button on your harmon remote. There should be a setting in there that says VFD under ADVANCED menu option that allows for turning the front of your stereo lights on and off and dimming them half way also. OFF/HALF/FULL are the 3 options I believe.
If this doesnt solve it your display may have crapped out on you.