Question about Audio & Video Receivers
Sounds like its going to square wave clipping and poking a dc offset at your speakers. Happens when the amp reaches power supply ceilings. Pink noise such as "rain sound" will push the output stages and power supply to limits. If its on all channels, check power supply caps and check for dry solder joints. also look for that crappy brown hold down glue that goes conductive/corrosive. check all output stages particularly about discrete output devices that are attached to heat-sinks. They have a bad habit of dry jointing also. Good Luck
looked for a free manual on line for you
http://www.nodevice.com/manual/Sony/page139.html got heaps... but not your exact model. You may be able to cross reference one
Posted on Feb 03, 2008
SOURCE: blinking standby mode light
With the unit unplugged, remove the top cover and use an ohmeter to check the 10 power transistors on the large heat sink; Q6050 thru 54 and Q6060 thru 64. If you find blown transistors (R<1 ohm from E to C) you'll need to replace them. Also check the large ceramic current sharing resistors, R6100 thru 04 next to the output transistors. These are dual 0.22 ohm, 2W resistors that typically fail open if overstressed. These are both common failures resulting from overloading the speaker outputs that will cause the proctection circuit to shut down the power supply at turn on. Good luck.
Posted on May 03, 2009
SOURCE: center channel is not working
First make sure the centre speaker is not shorted, try a different speaker and new fuses. If this fails and you have electronics knowledge here is the link to the service manual...
The driver or power output device (FET or Transistor) is probably shorted if the speaker is not shorted.
Posted on Jun 10, 2009
SOURCE: volume control blew out
i hade the same problem with the same unit and fixed it my self.
turns out the chip that is screwed to the heat sink was blown, and the resister that controles the fan burnt as well.all i did is ,get a datasheet of the unit and toke if apart went to the parts store and bought what was needed. the chip that is screwed to the heat sink has a part number on it whitch if you cant find the same can be switched with equivilant chip (find a datasheet of chip).
then my fan would not run ,i notesed that the risister was shot , the resister is color code witch means the resisters values. its a prety big job since the reciever has to be almost completely taken apart but very worth while .its ben workin like new for about 4 years since the repair with no problems or isues. hope this helps ad good luke.
Posted on Oct 28, 2010
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