Spillmagic
New Member
My dad has a Pioneer SX-424 that he bought new in the early 70's. I remember it working when I was a kid, and he always had music playing in the house.
Now he went to hook it up after some years sitting and it won't power on.
I've taken to fixing it, and have searched through the existing forum posts on the SX-424 and have not found an answer to my particular issue.
I have checked the three fuses that screw out from the back with a continuity tester, and all three fuses are good. I also checked the soldered in fuse inside the unit and it is also good.
I haven't went very far in troubleshooting, as I seem to have hit trouble very early in the circuitry.
There are two 110v plugs on the back of the unit. One always on, and one switched. The always on plug always has power, and this works. When turning the power/input selector knob to one of the 'on' positions, the switched still gets no power.
I feel like this is telling me that the on knob is not functioning correctly. Would that be correct?
I'm also thinking that this would all happen before the transformer, so my power issue seems to be isolated to just the input/switch area, because from there it goes straight into the transformer to power the boards.
Attached are a picture of the unit as a whole, the wires in question are the white ones at the top, these carry the 110vAC. The bottom picture is of the power switch/knob.
Any advice is VERY appreciated. I would love to get this working again for him, but don't want to buy a $40 replacement knob if that isn't my issue.
Now he went to hook it up after some years sitting and it won't power on.
I've taken to fixing it, and have searched through the existing forum posts on the SX-424 and have not found an answer to my particular issue.
I have checked the three fuses that screw out from the back with a continuity tester, and all three fuses are good. I also checked the soldered in fuse inside the unit and it is also good.
I haven't went very far in troubleshooting, as I seem to have hit trouble very early in the circuitry.
There are two 110v plugs on the back of the unit. One always on, and one switched. The always on plug always has power, and this works. When turning the power/input selector knob to one of the 'on' positions, the switched still gets no power.
I feel like this is telling me that the on knob is not functioning correctly. Would that be correct?
I'm also thinking that this would all happen before the transformer, so my power issue seems to be isolated to just the input/switch area, because from there it goes straight into the transformer to power the boards.
Attached are a picture of the unit as a whole, the wires in question are the white ones at the top, these carry the 110vAC. The bottom picture is of the power switch/knob.
Any advice is VERY appreciated. I would love to get this working again for him, but don't want to buy a $40 replacement knob if that isn't my issue.