Where is fuse in Yamaha A-520 amplifier? - Yamaha Audio Players & Recorders

check fuse

Your power suply is defective and needs repair.
Or the power amp is shorted will blow inside fuse power line
distribution.

you need to check the power supply input of your amplifier using a multimeter set your tester into a dc voltage reading.then measure the power input you must have a DC voltage supply reading..open the cover check the fuse an open fuse will turn the unit to no power.there are causes of blown fuse a shorted power transistor at the circuit will blown the fuse you need to replace faulty transistors before putting up a new fuse...check also the diode at the power supply section ,faulty diode could lead to the same problem..

• Bridged Max Power: 520 Watts
• RMS Mono: 170
• Variable Low Pass 40Hz-120Hz
• Variable Hi Pass 150Hz-1.5Khz
• THD: 0.02%
• Die-Cast Aluminum Heat Sinks

Check fuses in back. If not fuses the power supply is dead. Buy a new one. They do weae OUT EVENTUALLy

does it have sound if not it may be on a protect or themal mode try taking our=t your main fuse when the system is in and put it back in

Hello, it is worth checking that there is adequate ventillation around the unit, especially if it is in a cabinet. Also check that there is no dust clogging the vents on the unit. Another cause for overheating is using speakers that require far more power than your receiver can provide, or speakers with an ohm rating that is lower than the amplifier provides. Also, check to see if any wires to the speakers are crossing over as shorting will cause the amplifier to overheat and cut out. Hope this helps.

Hi..
It will need service.
I would call the music store closest to you that sells PA gear and ask who fixes theirs.

Product Details and Features PLX-520
Key Features
Amplifier Type Dual Channel Bridgable Bridgable RMS Power at 2 Ohms 400 W x 2
Performance
Frequency Response 10 Hz - 50000 Hz Signal to Noise Ratio 102 dB THD at Rated RMS Power 0.01 %
Crossover / Equalizer
Bass Boost With Bass Boost Low - Pass Frequency 50 Hz - 120 Hz High - Pass Frequency 80 Hz - 800 Hz
Other Features
MOSFET Circuitry Yes 3 Way Ready Yes
Dimensions
Width 10.4 in. Depth 17.7 in. Height 2 in. ..This is what I found for logic soundlab PLX-520 Amplifier, hope its what you were looking for. Don't forget to rate answers.

Check that you are replacing the fuse with the correct type first. Fuses marked with a T following the rating are "slo blo" fuses and if a fast blow is used instead, it will fail again at turn on. Otherwise, the amp will have a fault occurring, probably in the output stages. You should refer this type of fault to a repair guy that knows HiFi. as this sort of repair needs an experienced touch.