mr.muddles
Super Member
It's got something shorted or failed... I was trying to poke around using a dim bulb tester but keep getting smoke even with the limiter... it seems to have gotten worse... for awhile it wasn't smoking at all?
Thanks clinic-audio... I have the right values in there now but I don't think that's my issue currently. That might have been the original issue. But I have done something, or something has changed, and now it's messed up to the point of not knowing how to get it back on safely...
Great, I will start working on this!Easy to get back safely
Replace all burned components
Take of all the 4 transistors you touch
Check what voltage you have on both channel at collector TR521 ,522 (2SA912Q) = +0,8V and collector TR525 ,526 (2SC1885Q) = -0,6V
Easy to get back safely
Replace all burned components
Take of all the 4 transistors you touch
Check what voltage you have on both channel at collector TR521 ,522 (2SA912Q) = +0,8V and collector TR525 ,526 (2SC1885Q) = -0,6V
Now measure the base pads for voltage.I took your instructions:
With the black/negative lead on the chassis... and the red/positive on the center pin (the collector) of each transistor I got the following results:
TR521 = + 36.47V
TR522 = + 38.6V
TR525 = + 35V
TR526 = + 37.85V
No more smoke with the four transistors out... I assume you meant for me to take them out. they were left out to take the measurements.
GMTA..and about the base ?
the voltages aren't stable...and about the base ?
Yes.is TP2 ground? can I just clip on to that?
Yes, they are still removed!Do you still have the transistors removed? you should have near zero volts on the emitters, With the transistors removed.
Another thing. Your polarity on the collectors can not be correct.TR525
C = +35v
B = -36.8v
E = -37.3v
TR526
C = +37.9v
B = -40.5v
E = -40v
I just double checked the readings on two different meters and the collector is positive...Another thing. Your polarity on the collectors can not be correct.