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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Start with the process of elimination...disconnect speaker wires and (obviously) speakers. Does the amp still enter the protection mode? If not then check wires and speakers for issues. If the results are unchanged, look for protection circuit problems or "overlooked" power supply issues. Good luck...
Ok I'm going to be honest and tell u the truth, this exact thing happened to me. There is a 4 part pigtail relay plug connecting to a transister, the high only works because it bypasses the transiter and go directly into the fan power, but setings 1,2,3 eventualy and no longer usuable due to the transister input to the specific speed burning out, u can lose differnt speeds and differnt times depending on which speed u prefer the most. If u prolong the repaire even longer it will cause a short and u will burn fuses or even the main fuse in your fuse box. How to fix. I didn't perform the repair but I read that the relay and the pigtail are both located next to the fire wall. It cost me a few hundred dollers, and only 35 dollers for labor, the rest was the transister and the pigtail being the most. Sapposidly it was vary easy to get to, and if you look in a haynes repair manual it will give you the electrical scymatics of the wireing for the fan blower control.
It sounds like the power transister for the amplifier has blown. Inside, it is usually the largest transister connected directly to a heat sink. It will require the ability to solder (and unsolder) in order to affect the repair. Look up the transister from its code inscribed on the case to find a replacement. Power transisters are usually not very expensive. You can go to this link to see what a typical power transistor looks like. http://innovision-group.net/catalog/index.php?cPath=1_37
First you need to determine if the amp is defective or if something else is causing it to go into protection, most often a short in the sub or amp wiring.
Disconnect the sub(s) from the speaker output terminals and the RCA inputs from the head unit, and test if the amp powers up OK. If it does, the problem is in the sub(s) wiring or voice coils, or in the RCA inputs to the amp. Reconnect each one-at-a-time to determine exactly where the short is and repair or replace the defective wiring or unit. If it doesn't power up with the inputs and sub(s) disconnected, the amp itself is most likely defective.