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#1
07-13-2010, 10:45 PM
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Zenith 19L25 Chassis ( Service Info )
I've been thinking that when I get done with my Admiral, I want to take a crack at recapping that Zenith television set. It's a 1953 model L1846R with the 19L25 chassis. There's a member here at VK that posted a long time back that he had some service manuals, including this one that he'd be scanning into PDF format but I haven't been able to get ahold of him. I was wondering if anyone might have a copy somewhere I could get a look at because I haven't found any on the web and I can't exactly afford to order a set right now...
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#2
07-17-2010, 05:01 PM
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Update: I did find that I can get the schematic from Sam's with a subscription. Might be worth looking into, since I may be working on more things like this over time.
I also found out what type of CRT I've got here. It's a 17LP4. I'd like to remove it from the chassis because it weighs the thing down horrendously and I don't think I'm gonna be able to do much work on it until I do. There's a bunch of wires running to terminals which then run to the yoke which is held within a metal bracket. It's held down with about 4 screws, but it looks like I'm supposed to desolder the wires to free everything up. Don't ask me why I included a picture of the 1B3GT. I thought it was purty. Last edited by RitchieMars; 07-17-2010 at 05:39 PM.
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#4
07-17-2010, 05:56 PM
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Ohhh yeah... so all I should really worry about is taking off is those magnet rings in the back and that ion trap and slide it out from the front?
Wow, I just got it out in no time. That was a lot more simple than it looked... thanks! Last edited by RitchieMars; 07-17-2010 at 06:03 PM.
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#5
07-17-2010, 09:38 PM
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Do you have service info yet? I just picked up a stack of Rider's manuals today, and the complete service info on your set is here...
FWIW, I have a 10" tube with even bigger cracks on the neck. I put it into my dad's tv and he has been playing it nonstop for the last month or so-still runs good. I would at least use the old crt to set up your tv during restoration. Maybe hunt down a brightener if the picture is still dim after a recap...
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#6
07-17-2010, 10:19 PM
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Yeah, I'm pretty sure this CRT will do well-enough for me to check for improvement after I replace the capacitors. If there's hope for it, even with the cracks, then I might not count it out just yet. It had a dim picture that whole time and when I saw the crack around the neck, I'd feared the worst.
Oh, and I haven't gotten ANY kind of service info, yet! The whole reason I was taking out my CRT today was to get into the chassis and make a lame attempt to find the values on the capacitors themselves. The cap's don't look melted like the one's in my radios, but all the same. But yeah, if you were able to get that service information to me somehow or another, I would definitely appreciate it!
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#7
07-23-2010, 06:59 PM
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odd. It looks like another number off to the left? I wonder if it's just set for 25 on 13 or if it is the whole uhf band that displays thru the center. If so there must be some way of rotating the uhf display.
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#8
07-23-2010, 07:41 PM
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What does the rest of the tuner look like?
Phil
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#9
07-24-2010, 04:27 AM
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After looking through the service info that leadlike kindly put together for me, I'm pretty sure there's no UHF on my Zenith. It looks like there's supposed to be a separate tuner assembly mounted in front of the regular one which I obviously don't have in my tv. The knob itself should have UHF channel numbers listed around the outer circumference of the knob, which I don't have either.
Here's what the whole thing looked like the first time I removed it from it's cabinet. Oh, and that other number was bleeding over in the picture because I was holding an LED to light it just for that photo. Properly mounted in the tv, it shouldn't show but one channel number at a time. 13 is the only instance where it projects a number other than what is shown on the gold bezel, in this case 25. Last edited by RitchieMars; 07-24-2010 at 04:32 AM.
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#10
07-24-2010, 07:10 PM
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Greetings from FixitLand!
Quote:
Take care, -- J. E. Knox 'The Victor Freak'
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| Audiokarma |
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#11
07-25-2010, 02:11 AM
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My tuner seems to lift straight out the top as a whole unit, but sure enough, I did find this:
 So what's the functionality of having the one UHF channel?
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#12
08-03-2010, 02:12 AM
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I have a Zenith with similar chassis. Notice that some of the terminal strip lugs were left blank at the factory. I found that to be very considerate of them when I got around to replacing the old electrolytics.
And yes, that's your flyback, presumably a healthy one.
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#13
08-03-2010, 02:31 AM
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Oh, I didn't think about that, but it'll definitely be handy having those extra lugs. I have to admit, when I saw this circuitry for the first time, it was pretty intimidating. But, based on what I've worked on so far, I seem to work pretty slow and double-check everything as I go. It took me all day the first time I recapped a radio chassis, so I'd imagine it'll take me a few long nights to do this one.
I'm going to have to get a rebuilt CRT sent to me for this television, so the flyback had sure better hold up!
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#14
08-03-2010, 06:03 AM
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The coating on my fly was falling off so I coated it with non-acidic silicone. I bought it at the auto parts store (sensor safe). For the simulated gold you could try mohawk laquer. They have a clear with an amber tone that might work.
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