My repair man has determined a few transisters to be defective, has replaced them, and when he fired it up, they blew out again. So he has asked me for a manual or schematic for it, but do not have either. So my question is a acquire them somewhere to help aid him with the repair. Can you help me, please?
Have you resolved this issue wit with M80 Amp? This amp has a unique DC path and if it is several years old, some caps and diodes go bad. In most case the power transistors are not bad when the protection light comes on. I bought my M80 in Germany back in the mid eighties and had to do some repairs in the last 5 years but it still works hard.
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The protection mode has activated. Reset the protection mode as follows and see what happens.
Connect power cord to mains and wait 5 seconds or so. While holding down "info" and "tone control" buttons, press "main zone" power button briefly and release, but keep "info" and "tone control" buttons pressed for at least 3 more seconds. The unit should power up. Assuming the reason for the protection has passed or been fixed, the unit can now be turned off and then back on with the "main zone" power button to restore normal operation mode. If the protector activates again, the fault is still present and the unit needs to be repaired, ideally by a Yamaha authorised repairer. There are dangerous voltages present in high power amps and a lot of grunt in terms of stored energy - best left to trained technicians.
If there is no audible physical click from the speaker output relay, after about 10 to 20 seconds, there is an electronic fault in one or both amplifier circuits, which will require repair. If you like the sound of this unit enough to pay maybe $50 give or take, get it repaired. Otherwise, you can pick a similar unit up at a thrift shop for a few dollars.
First - make sure it is not a defective cable by reversing the leads/colors on the inputs if problem then goes to the right channel then you know it is a bad cable/RCA, etc., connector. I would try that first.
is it pl;uged direct in wall must nbe on a nice hi end break surge proably got zapped transisters in it best to try to replace it u can try to un plug it from that outlet few min then back in anther one