I have a Sony STR-DE535 amplifier and sound system. Whenever it is powered on, in the display window is the legend "Protected." I turned all the speakers off position and when I powered on again, had still the same problem. The same "Protected" alert displays whatever program I request from the amplifier, be it radio stations or TV or whatever, and the system does not function. No sound at all, not even static. I checked the troubleshooting guide in the back of the Users Manual; no help. Any help in finding a solution to this "Protected" problem will be sincerely appreciated.
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If the output transistors are shorted they cause burns on the resistors and even even blow the AC fuse and your receiver will not come ON. I used to enjoy fixing, these AMPs this was many years ago. Any how, repairing this unit will be more than a $100.00 my advice to you is BUY a NEW 1.
I beleive it is a 6.3amp gma. It will be printed on the circuit board next to the fuse holder and on the fuse itself. If it is open(blown) you probably will need to replace a set of the output transisters (mp1620 and mn2488). DO NOT use a slow-blow fuse this will cause more damage to your receiver.
If the power of the Receiver is ON, press Power to turn OFF the power. Then, hold down the MODE + button and press the Power button together.
S.F Intialize appears in the display and all sound fields are reset at once.