Ok, I will try that this afternoon (I know it is already afternoon where you are!)q4 seems to be having problems .. say if you lifted q4 collector the voltage has to rise .
AWM 027 AWhat is your board part number?
Not in wrong. I double checked schematic and what is printed on the board. The 1845 is ECB from face.q4 is leaky or is in wrong way . well that is how it looks from here .
The schematics for the A version is in the service manual that can be downloaded at HiFi Engine. Do you have access to that? There is another document on there that is just the schematics, but that one has the revision D board.i have looked for an A revision diagram but haven't found it as yet . i see the board layout is different from pics . no idea if circuit is different though . if it is we might be missing something .
Yes, you have revision D, you can see it printed on the board after the board number.I've uploaded some pictures of the protection board in my SA-8100. I think it is the same... AWM-027.... EDIT: Seemingly mine is the D revision?
You could be right.... I think I have had problems sometimes when replacing 945's with 1845's...
Not sure if you checked yet... but Pin 6 should have -13V on it?
I have looked at the A and D board board images, and it seems to me the circuits are different. I don't have the circuit diagram for revision D to clearly see it, so I was just going off the image in the schematics document I mentioned that showed revision D.i have looked for an A revision diagram but haven't found it as yet . i see the board layout is different from pics . no idea if circuit is different though . if it is we might be missing something .
All three are good.just in case did we cover r15 r16 r17 ? i suspect they are fine . but something is not correct .
Out of curiosity, what function does d6 and q4 serve in the overall "protection" function?