Jailtime
Standin' on a corner
I restored my 4400 a while back, worked great as you would expect from a restored receiver. I recently moved, and the 4400 was packed well enough that it wasn't visibly damaged. I put it in my system for the first time since the move, and it's broke. Here's the deal, all inputs sound weak in all channels, volume and balance controls have no effect. So at zero volume, any input sounds like it's just bleeding through.
Power amps are good, I checked them with the main in. Tuner section is good, I used the tape monitor out into another receiver to check that. Power supply voltages are good. I checked around with my scope and a 1KHz signal, there's good signal at the JE01-JE04 inputs to the buffer/preamplifier board. No signal on the JE17-JE20 outputs though. I checked around some of the transistors too, HE13-16 didn't seem to have signal, so I replaced them. Didn't solve the issue though. I should mention the transistors on the board are original.
Start shotgunning transistors? I really should replace the other row of "shithaus" C1345s (HE01-04), but they seemed to be passing signal fine. I'm out of ideas.
Power amps are good, I checked them with the main in. Tuner section is good, I used the tape monitor out into another receiver to check that. Power supply voltages are good. I checked around with my scope and a 1KHz signal, there's good signal at the JE01-JE04 inputs to the buffer/preamplifier board. No signal on the JE17-JE20 outputs though. I checked around some of the transistors too, HE13-16 didn't seem to have signal, so I replaced them. Didn't solve the issue though. I should mention the transistors on the board are original.
Start shotgunning transistors? I really should replace the other row of "shithaus" C1345s (HE01-04), but they seemed to be passing signal fine. I'm out of ideas.