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get some 10 ohm (4.7 if its a 4 ohm output) 7 watt resistors and use them as dummy loads,check the current on each of the power supply rails  ( possible by replaceing  the psu rail fuse with a multimeter set to amps) without an input signal,replace the fuses and measure the output voltage of the psu,if there both within the desired range check for any d.c voltage at the speaker terminals,if everythings good so far replace the resistors with some speakers,perferable some that dont matter,plug in a test signal,monos better as both channels will be getting the same thing and give it a listen,let it play for an hour or 2 and recheck the above tests.

or hippys method,plug it up and turn it on  ,if it works let it play for a few minutes then have a sniff around the circuit,if you dont smell burning or see smoke check the output for any d.c if its ok put the lid on and enjoy


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