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Most have an internal buss fuse, usually located on the back panel. Some are mounted on the main circuit board. Check to see if the fuse is blown, and replace it if its bad. Be aware that fuses are designed to prevent more serious damage to the unit, and that there may be other underlying reasons for it to blow, such as other component failures.
are short in the audio output transistors may have been short since a channel 2 or maybe 4, also open resistance check carefully and change them after you put a 75w bulb in series 100w or where is the fuse clearly, you have to remove the fuse when you put the focus if all is well will turn on only a small incandescent and amplifier work well you put audio speakers and there will, if everything is well put the fuse back and ready.
The likely cause of this is a dead short in the power supply. I don't receal the specifics of this unit, but there should be a set of four(4) diodes or a single bridge rectifier in the main power supply area. Check this/these for a direct short using a diode checker. Other than that, the output transistors being shorted can cause hte same symptom. Without seeing the actual unit, I can not tell for sure. If you know how, check the output transistors as well. Report your results here.
Dissconnect ALL speakers from back of unit then try to turn on.
If it works you have a speaker short.
If not, you have a more serious problem.
DO NOT replace the fuse with anything else but what was specified, as it can cause a fire!
This condition, may be produced by defective components (Q506, Q507). you can remove those transistor, replace the fuses, power-on and wait for relays click. if the fuses not blown again, them replace both transistor.
blowing fuse only indicates that there is power surges in your area. in order to avoid blowing your fuse again. you may need to a have a surge supressor and auto voltage regulator used for your receiver and any appliance that may need it.