Does anyone know of variations in the MR74 Mpx board? I have two. One recapped by Mr. Dewick that works great, and one that is kind of a wreck that I’m trying to fixed. One board has an extra transistor not shown on the schematic, that is found on HiFi Engine. It is attached to the Q405 transistor and diode D404 is not present. This is the area of the board where I’m having trouble getting the negative 2.5 base voltage. If anyone could point to a different schematic, I appreciate it. Thanks in advance.
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Thanks. That looks right. There’s even a note on it. I had checked MX114 and it’s the same as the MR74. Thanks again.
clinic-audio
all on YAMAHA untill 1990
Hello
This is not the first time we said it , but you have to work on your unit with the right service manual matching his serial number
Many members seems to think that download a schematic on the web is the best
We see today again , that this is not true
This is not the first time we said it , but you have to work on your unit with the right service manual matching his serial number
Many members seems to think that download a schematic on the web is the best
We see today again , that this is not true