Question about Sony STR-DE475 Receiver
ALL COMPONENTS WORK FINE THROUGH THE SPEAKERS, BUT WHEN I SWITCH TO THE TUNER I GET A HUMMING NOISE AND THE RADIO STATION IS FAINT, THIS PROBLEM STARTED INSTANTLY THE RECEIVER HAD BEEN WORKING FINE UNTIL THE PROBLEM OCCURED
I had this problem last night.
To solve it, you can reset the amp by:
1) Put the receiver on stand-by
2) Hold down "MODE" button and press on button
3) "S.F. CLR" appears in the display and surround is back on.
Posted on Feb 10, 2009
SOURCE: Centre speaker stops functioning
Is the audio for the center channel driven by its own amp? No other channels on it or affected?
Assuming you're not cranking it up to "11" to rattle the walls...
I think what you're hearing is the protection relay dropping out - removing power from the output stages of the amp when the amp thinks something is amiss. If it turns on OK after being OFF for a while and repeats the loop you probably have a heat issue.
A solid click OFF that is not resettable would possibly be a short in the speaker path - shorted speaker wire or speaker.
Check the amp to see if it was hot to the touch or getting warmer up to the point it clicked off.
Is it ventilated properly with no heat-producing components below it? Clean out its vents and make sure it can breath. If it has a fan make sure it's working and has good airflow.
Posted on Apr 02, 2009
It has a dedicated sub out. you need a phono connection on one end for the amp and the other end must have a compatable connection to your sub.
You will need a phono connection to the amp from your TV. You can utilise a scart lead that has phono outputs however a TV with audio outs (the red and white leads) is the default option.
Posted on Jun 02, 2009
SOURCE: Subwoofer hum from STR-DH800
That points pretty much to a bad shield on the cable. Have you tried another one? Another thing to try is to rotate the AC power cord on the sub (if it has one). Sorry, too lazy to look it up.
Posted on Dec 29, 2009
The relay or relays that click disconnect the receiver from the speaker terminals so that no dc voltage can burn out the speakers. More than likely the power output transistor(s) are faulty. Look at the relay(s), determine the input and output connections. The inputs come from the output power transistor and emitter resistors area, the output of the relay(s) connect to the speaker terminals. Check for dc voltage on the input contacts in the range of 30-60 volts possibly. If dc voltage is found there then you have bad outputs, caps or emitter resistors. A word of caution -troubleshooting at this level requires advance knowlege of electronics, do not attempt this with out onsite help from a experience tech.
Posted on Jul 01, 2010
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