Picked up a QX949A that was worked over badly, an abandoned project. But it was practically free so I could not resist.
I worked through all of the shoddy repairs, broken traces, poor soldering, masking tape, and bad jumpers. It sounds really nice and got the scope working, which is a cool feature.
I was not getting phono or AUX on the SQ setting (though it did work on CD4) so I recapped that board to get rid of all of the troublesome little blue Sanyo caps and fix some bad soldering and jumpers.
Then I was able to confirm that I had a good clean signal coming into and out of the SQ board.
I was not able to understand the schematic and the path that the signal takes after that switch (S2).... looks like it goes to the mode switch. I cleaned that switch a couple times but same result. I don't know enough to chalk it up to a bad switch.
I've got a lot to learn and this quad unit wiring is challenging me greatly.
I worked through all of the shoddy repairs, broken traces, poor soldering, masking tape, and bad jumpers. It sounds really nice and got the scope working, which is a cool feature.
I was not getting phono or AUX on the SQ setting (though it did work on CD4) so I recapped that board to get rid of all of the troublesome little blue Sanyo caps and fix some bad soldering and jumpers.
Then I was able to confirm that I had a good clean signal coming into and out of the SQ board.
I was not able to understand the schematic and the path that the signal takes after that switch (S2).... looks like it goes to the mode switch. I cleaned that switch a couple times but same result. I don't know enough to chalk it up to a bad switch.
I've got a lot to learn and this quad unit wiring is challenging me greatly.