MCS 3850 left channel

[moon_pie]

Hello,

I've got an MCS 3850 with a dead left channel.
I've replaced the fuse, which was blown, and cleaned the pots, switches and jacks according to the idots guide. Still no left channel sound or illumination on the left channel meter.
The left channel meter is capable of illumination, as I've seen it illuminate slightly as I turn on the unit.
What are my next steps?

Thanks!
-nate

 

[cademan]

What is your level of expertise?

 

[moon_pie]

@cademan I've got a voltage meter, a soldering iron, and lots of time

 

[cademan]

Did you notice if the old fuse was black? If it was, this would usually indicate a shorted output transistor and sometimes other things down the line. Test the output transistors, driver(s) and pre drivers for that channel for shorts including open emitter resistors.

 

[MCS Guy]

This might help. It has STK 1050 outputs.

 

[moon_pie]

Testing the STK 1050 pins. I am all across the board with the readings, and they are different for both outputs. I am getting some shorts (prolonged beeps) with both outputs. I will write down exactly what I am getting and send, but if anyone has a tip on where I might find what the readings should be, would be great!
I am also having a hard time determining which output transistor is for what channel. I see it on the schematic (IC 201, and IC 202), but when I follow the path backward, I get lost.

@cademan The fuse was indeed black.

Thanks in advance