I was thinking this could be an easy fix. I knew one channel was out. I cleaned the pots and switches, and then hooked up the test speakers to see what would happen. As soon as the woofer sucked in I knew I had DC on that channel. What do you recommend for a better testing method?
Yup, fraid so.I assume if I replace the outputs on one channel I should replace the other channel too.
No.Its not necessary.I assume if I replace the outputs on one channel I should replace the other channel too.
You are right, you'll measure a voltage drop of around 0.6V from base to emitter and from base to collector, only in one sense, and no continuity in the opposite way, and no continuity between emitter and collector.. Usually, a shorted transistor measures a short from collector to emitter, or to base. A good transistor won't have continuity from collector to emitter or from emitter to collector.I pulled the outputs. I have 4 different ones. This unit must have been worked on in the past. They are
Sanyo B507D
Sanyo B507
Sanyo D313D
No make D313
So they are the correct number according to the schematic.
If I remember how to test transistors correctly, i use my meter in diode mode, and go from base to collector, and then base to emitter. Depending on what type of transistor it is, it will read correctly with the positive lead on base, or the negative if its the other type