Hello,
my Boston MCS-95 no longer functions, standby LED is off, no sound. The fuse is fine, and even the post rectifier stage ~350V at the half bridge driver appears to be good. Found an old post about the 18V zener being blown, but the replacement didn't fix mine.
So I could scrap the whole thing and buy a new one, but what fun is that?
I have the full schematic, background in EE (microwaves mostly) and plenty of test tools.
Any recommendations of where to start to understand these class D amplifiers? a
Thanks in advance
my Boston MCS-95 no longer functions, standby LED is off, no sound. The fuse is fine, and even the post rectifier stage ~350V at the half bridge driver appears to be good. Found an old post about the 18V zener being blown, but the replacement didn't fix mine.
So I could scrap the whole thing and buy a new one, but what fun is that?
I have the full schematic, background in EE (microwaves mostly) and plenty of test tools.
Any recommendations of where to start to understand these class D amplifiers? a
Thanks in advance
This really sounds like you've got a power supply problem more than one with the power amp. There has to be some sort of auxiliary supply for the low-level stages and the power indicator, I would look for that.