Blown sony reciever fuses - Sony Audio Players & Recorders

Check the main fuse if it is open (blown) it will probably need output transistors MP1620 MN2488, if not it may need the main power transformer.

DO NOT use a slow-blow fuse this will cause more damage to the receiver!

the fuse rating should be printed at the back near the fuse holder itself. If it opens the fuse again and again probably you have a circuit loading problem in the receiver...either one of the amps is failing.

blue two legged varacter on power supply board needs to be replaced

You might be trying to push it too hard, or you might have a short somewhere. Disconnect everything from the reciever except its power cord and turn it on. If it still goes into protect mode, then try to find a reset switch (not sure if this is on the Sony, some recievers have them). If it's NOT in protect mode, then you had a speaker wire shorting out on the back. Make sure that you don't have any stray wires when you connect the cables on the back of your receiver. It only takes one strand of copper to short out the amp section. If that doesn't work then pull the top cover off and chech the fuses out. One of them might be blown.

Tom

If the problem was blown "output transistors" expect a cost of about $6-$8 per transistor (there are 4 total in the receiver) plus a few bucks for an emitter resistor and perhaps $2 each for the driver transistors (4 max per receiver). Also add in the local labor rate.
Please note that these are estimates and that additional parts may be required depending upon how smoked the output section actually is.
Dan

Are all the speakers GOOD and all connected right?
If so then you have at least one blown output amplifier module.

Your are running out of power !!

Your speakers or the wiring to the speakers shorted out, and a fuse inside of your receiver is blown. You can purchase a new unit or attempt to replace the fuse yourself.

Hey Yoo,

 

Go to Radio shack and get you an adapter that will take an earphone jack and convert it to RCA male.  You use this to simulate the signal coming from the reciever.  Hook up to a Cd player or Walkman, anything with an earphone output jack. Test that the device actually puts out music or anything worth listening to.  Connect the device to the input of your amp, with the car running, and the reciever turned on.. This will tell yo if the signal is getting from the reciever to the amp. You may not be getting signal from the head unit. 

If you still get no sound to the woofers, dsisconnect the woofers and try a different speaker.  If that speaker dont work,  Change setting and switches., and if you still get no sound, then your amp is toast.

I has the exact same problem with the same reciever. It was the neg and positive wires getting too close. Don't join wires together to get the length you want. Make sure you use atleast 16ga wire with NO interconnections. My short went right through electical tape when turned up. ng