I had the same problem, but it is not the tuner module! An
exchange of capacitor C899(100μF/35V) on the standby board has resolved
the problem. Under a dollar from an electrical store and you are all
sorted. 10 minute fix for those with a soldering iron.
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it's obviously getting interferance fronm that whole house broadcast unit (not abnormal!) best and only thing you can do is to move the stereo to a place where you can get the MOST am stations the loop ant. is exactly what it says it is a loop of wire with two ends..both ends connect to the ant. input on the back of the unit..however if that whole house broadcast unit is the devil then an ant. no matter what or how it's made will only recieve more static not built to reject static! so you've got to move it unfortunately ..fm is a totally different band obviously fm isn't being affected by that whole home broadcast unit..you're lucky! on that count
This is probably a 60 cycle hum and the problem is more likely confined to the am/fm board, there is a bad ground due to poor solder joints, broken ground wire, an open capacitor, this may not be easy to find, but it is a start.
If I understand your setup, you've connected the receiver antenna terminal to the output of the antenna amplifier. If this is true, I'd suggest trying the receiver using a plain old FM dipole antenna (available at Radio Shack and other stores) or even just a piece of wire hooked to the antenna terminal. You should be able to pick up some local FM stations then.
What might be happening is that the FM is being filtered out by the amplifier. Some amps made mainly as a TV signal booster have an FM trap designed to block the FM broadcast band. In the analog broadcast days, the FM band was right near the sound part of a TV signal, and the trap was there to prevent interference. It may be filtering out your FM band.It may also be possible that you're just overloading the FM antenna input with the amplified signal. Sometimes a signal can be too strong. Using a simple wire antenna will let you test the receiver by itself.
Other than connecting an antenna you shouldn't have to do any setup for FM reception. If you still get no stations at all when using a simple antenna, then the receiver may need service. But I doubt Circuit City would have sold a floor model that was defective, even at the very end, unless it was clearly marked as such and sold "as-is". I'm pretty sure you'll find that the receiver works with an antenna made for FM.
I'm thinking you have an open shield ground on the RCA input side. Connecting speaker inputs possibly restores the ground. Try connecting the high level inputs then disconnect the remote end of the cables (floating the grounds).
Then get out an ohmmeter and find that open circuitor or bad solder joint between RCA ground and real ground in the speaker's amplifier. Or.... if speaker ground kills the hum and you want to use RCA Line Level input to the sub, just connect one minus speaker output on your source amp to one minus on the sub's amp.
Hmm, sounds similar to my problem. Analog input and FM seems to work
but all coax/opto input are dead ( for me there isn't a buzz).
Have you, fredrik648, solved your problem?
Anyone with ideas what to do?
The "buzz" you hear is a power hum made by the power supply transformer. It's technically called "Lamination hum" caused by the revering of electrical current through the power supply transformer. In some cases the hum can vibrate the chassis causing other loose material to vibrate. If you can, go to your dealer and check to see if other units of this same type typically make a hum this loud, and if not, see if he can solve the problem for you.
have you tried to input another audio source into the audio inputs on the reciever that the cable box outputs are going into on the reciever ?
you may also need to ground the recievers frame and cable box frame to earth ground.
you also may have a bad connection in the wires or jacks for the audio connections
or the cable box audio out circuit needs repair