Zenith 10S690 Volume Control Issues

[old_coot88]

Originally Posted by vortalexfan

... can having the chassis not being completely tightened down to the cabinet cause reception issues?

Can't think of any reason how/why it should. Question- is there any way the cabinet can be laid on its side, and the chassis slid back far enough to take voltage readings in the RF and IF areas? Or is this a large floor-standing console?

(Back in the day, this was a common accessability practice in TV service, even with console sets. It was usually done with the heavy end of the chassis down.)

[vortalexfan]

Originally Posted by old_coot88

Can't think of any reason how/why it should. Question- is there any way the cabinet can be laid on its side, and the chassis slid back far enough to take voltage readings in the RF and IF areas? Or is this a large floor-standing console?

(Back in the day, this was a common accessability practice in TV service, even with console sets. It was usually done with the heavy end of the chassis down.)

This is a large Phono/Radio Console it's kind of hard to tip it on its side.

[old_coot88]

This is a long shot, but.... in post# 10, fourth photo, near the center of the shot, there is a 330K (orange-orange-yellow) resistor. To its left is a yellow capacitor labeled 333K 630V. A bare lead from the resistor looks to be lying directly across a bare lead from the capacitor when you blow up the image 300%. It may just be the camera angle, but would be worth checking.

[vortalexfan]

Originally Posted by old_coot88

This is a long shot, but.... in post# 10, fourth photo, near the center of the shot, there is a 330K (orange-orange-yellow) resistor. To its left is a yellow capacitor labeled 333K 630V. A bare lead from the resistor looks to be lying directly across a bare lead from the capacitor when you blow up the image 300%. It may just be the camera angle, but would be worth checking.

I think that's an illusion, because the resistor you're referring to isn't actually touching that capacitor because it's about a 1/4" higher than the capacitor.

Well. I'll try and take the chassis out of the cabinet again and attempt to get the speaker out of the cabinet to put it on my bench and see if I can get some voltage measurements, the only reason why I didn't want to monkey around with taking it out of the cabinet is because with my cut on my knuckle it's hard to unscrew the screws without hitting my knuckle against the cabinet.

[vortalexfan]

OK. so question, what is this coil for?
See picture attached below.

I'm asking because when I was cleaning out my volume control pot earlier with the contact cleaner I accidentally got a bunch of contact cleaner on this coil assembly and I'm wondering if me getting contact cleaner on this coil assembly might of messed something up with the radio's reception.

This is the only other thing I could think of that might of been messing things up.

Thoughts?

[vortalexfan]

OK, so I don't know what I did to it, but now the tuner is working again.

[vortalexfan]

OK well, I tried it out again now that I got the tuner working again, and the volume control quit working again and it started working like a tone control knob again.

I double checked EVERYTHING and there isn't anything wired up wrong and the volume control pot isn't open, so it seems like I'm chasing down some sort of weird electrical phantom in this radio...

Any other ideas as to what could be causing my volume control issues?