Yet another Zenith To identify

[Electronic M]

Sometimes wiring changes were made...It it takes the same power and signals in and spits the correct signals out, that is all the TV cares about.

Slider pots tend to be MUCH less reliable than rotational ones IMO. If you know the pot's resistance try subbing a rotating type and see if that helps.

[zeno]

Thinking back over CC2's there were several plug ins. They
are marked by white paper or plastic tabs on the chassis contacts.

Speakers ( 2 brown)

A cap that just killed the bass on small speaker models.
( 17 & 19" & maybe low end 23 & 25" )

Volume control (not all). The VC changed a DC level to the IC
NOT the usual coupling cap-VC-coupling cap.

Mute between channels. (? blue-white ?) also raster mute
went to the 9-88-# on these IIRC.

Sliders can get very bad. Try cleaning with WD40.
Unhook everything but SPKR & VC to narrow down.

GL
73 Zeno

[Dreamsbeard]

Originally Posted by zeno

Thinking back over CC2's there were several plug ins. They
are marked by white paper or plastic tabs on the chassis contacts.

Speakers ( 2 brown)

A cap that just killed the bass on small speaker models.
( 17 & 19" & maybe low end 23 & 25" )

Volume control (not all). The VC changed a DC level to the IC
NOT the usual coupling cap-VC-coupling cap.

Mute between channels. (? blue-white ?) also raster mute
went to the 9-88-# on these IIRC.

Sliders can get very bad. Try cleaning with WD40.
Unhook everything but SPKR & VC to narrow down.

GL
73 Zeno

I've unhook the "tone"pot from the sound module and the low rumbling and tin can sound is still there, so its not the "tone" pot. Unhooking the VC...well I get no sound (of course).

I tried with another speaker...bad sound still there.

I will get some wd40, but I juiced that sliding pot pretty good with my go to cleaner and it didn't do a thing. Will try the WD40 anyway,

That cap that killed low frequency sure does sound good because its how I would describe the sound : high frequency are there but anything that is in the low spectrum is kind of garbles and muted... I imagine that cap is on the sound module? And if it is, could it be a high enough failure part that both my sound module could be bad?

[Dreamsbeard]

Originally Posted by Electronic M

Sometimes wiring changes were made...It it takes the same power and signals in and spits the correct signals out, that is all the TV cares about.

Slider pots tend to be MUCH less reliable than rotational ones IMO. If you know the pot's resistance try subbing a rotating type and see if that helps.

I think, this might be a good idea, but I have no idea of the sliding pot resistance, can't see anything on the part itself. would anyone have this information on hand? I guess I could short the pot a few seconds just to see...

Thanks!

[zeno]

Just looked at the photo. Looks like this has wires for
the VC & probably audio mute between channels or tone.
Does it have a tone control ? Anyhows on the IF strip
it shows where some of the wires go, check the layout
chart also & be sure every things where it belongs.
Looks like it has an oval SPKR so no bass cut cap.

I will see if I got the manual but my squaw is on vacation &
I just bought her a new car so she wants to go places, not
fix TV's !!! I will get to it though........

BTW Analog meters are best for some tests & alignments.
If you got one unhook the VC & see if it gives smooth ops
across its range. The value should be printed on it. Zenith
used heavy US made sliders but they still sucked like
all others compaired to regular pots.

73 Zeno

[Dreamsbeard]

Originally Posted by zeno

Just looked at the photo. Looks like this has wires for
the VC & probably audio mute between channels or tone.
Does it have a tone control ? Anyhows on the IF strip
it shows where some of the wires go, check the layout
chart also & be sure every things where it belongs.
Looks like it has an oval SPKR so no bass cut cap.

I will see if I got the manual but my squaw is on vacation &
I just bought her a new car so she wants to go places, not
fix TV's !!! I will get to it though........

BTW Analog meters are best for some tests & alignments.
If you got one unhook the VC & see if it gives smooth ops
across its range. The value should be printed on it. Zenith
used heavy US made sliders but they still sucked like
all others compaired to regular pots.

73 Zeno

Well finally got around to spray that thing with WD40. Didn't work. I also checked if it was giving smooth operation all the way with my multimeter (unfortunately I only got an el cheapo digital one). Pot SEEMS to give smooth operation but I am unsure.

I read 0 - 75k ohms on that pot, Zeno does that sound about right to you?

If so, will try to substitute with a rotary one just to see.

Thanks!

[zeno]

75K probably OK but seems like a high value 2 me.
Try hanging a different speaker on it also, could
be the voice coil is stuck. Unplug the in set SPKR for test,
use almost any SPKR for the test.........

73 Zeno
LFOD !