Chosen Solution
I am dealing with a Technics SA-EX100 stereo receiver. My issue is that the right input for phono is super low. This is what I’ve tested so far using my headphones: -Swapped left and right phono in, made the left side quiet and the right side normal volume -Plugged the phono into CD and tape inputs. They were very quiet since it lacks the pre-amp, but they were at an equal volume for both left and right -Playing something else like the radio give equal volume in both left and right I have been able to hear the phono right side at a low level by turning the balance almost all the way to the right and then turning the volume up to max. What I’m looking for is where I should be focusing on when I open this up. Does it seem like a dry solder joint situation or bad caps? Are there electronic components I’m not thinking about like resisters that would cause this? Is this a rabbit hole that I don’t want to go down? I have this specifically for playing records, and this is really bumming me out ATM.
Hi @sparklepimp , Here’s the phono section of the service manual for the receiver, showing the input circuit. I’m at a bit of a loss to understand why the volume would change when swapping the L & R inputs because if the right phono input in the receiver was faulty then it would always be faulty whether the left output or right output from the turntable was connected to it and not change to the left input.
Hey Michael, Its been a while since i worked on audio amps but you could be looking at anyting from poor connections to faulty components. getting your hands on a circuit diagram for the model and tracing the line back from the output would be a good place to start, check the components for discolouration and if you have a multimeter on hand and know how to use it, check for open circuits where they shouldnt be.
