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#1
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Vert hold/control ?
Restored the picture and sound, vertical is off on the bottom however. Adjusted to no avail, any thoughts? Control might be bad?
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#2
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There is usually an electrolytic cap in the cathode of the vertical
output ( 13DR7 ?). Probably part of a can. Common fail for years on many B&W and color sets. Start with that. Looks like this set will come out nice ! Very brite & sharp pix. They dont make em like that anymore ! 73 Zeno LFOD ! |
#3
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Something like this?
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#4
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Yup.
On a similar age 17" Zenith its the triangle marked section of C2. 100 mfd 50V. You can just hang another across it to test. BTW do you have the schematic ? 73 Zeno LFOD ! |
#5
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BTW this is the second or third question thread relating to this TV you've posted. It is best to make one topic for the set and ask your questions there so all the info is in one place and we don't have to search to help you.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
Audiokarma |
#6
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Quote:
Wind157: Especially since you are new to restoring these, you will have a lot of questions. If you keep all your posts of the same set in the same thread, we can all follow along easily to help you. BTW, welcome to the forum. Lots of good guys here to help. Also, if you fill in your profile with at least your location, you may find one or more of us may live nearby and be able to mentor you face-to-face. . |
#7
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Understood. Thanks for the help.
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#8
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There are only two cans like that, one is labeled as C2on the schematic but with a circle of that makes a difference? I have no idea how to check if this is good or not let alone get it off
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#9
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No need to pull old can.
Cans are one to four sections, each a separate cap. All the negative leads go to the can part. Each cap is marked on the bottom with a square, triangle, half moon & slash. You see that stamped into the can also. And it matches the manual. To test hang one in parallel thats of similar value in mfd & the same or higher in voltage. Use clip leads to do it. Match + to + - to - If that fixes it you can cut the wires off the bad section & put the right value in. 73 Zeno LFOD ! |
#10
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Bear in mind that if the original failed electrically leaky or shorted putting a new cap in parallel will have no effect on the symptoms.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
Audiokarma |
#11
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You don't need to open the can. The terminals to the silver can are on the CRT screen side of the chassis near the cardboard wrapped can. If they are hard to get at with the CRT installed then remove the CRT...To do that disconnect the side CRT HV lead, the CRT socket connector, and loosten the bolt on the yoke clamp then slide the CRT forward through the yoke...If it hangs up on the yoke back it up 2" and slip a card between the CRT and yoke...Push the CRT through the yoke primarily with the end of the bakelite CRT base to prevent ripping the base off if it hangs up in the yoke.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#12
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I haven't tried replacing a capacitor from the can yet but I wonder if it could be something else. I can adjust it to get a full picture on most of the screen but still solid black on the bottom 2ish inches. Could the picture tube just not be alligned some how? No matter how I change the vert/hort it still doesn't display anything on the bottom.
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#13
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CRT/yoke alignment cannot do this. It's a case of very bad vertical non-linearity, almost surely due to a bad component and very likely a bad capacitor.
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#14
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Thanks. The SAMS I found lists that a tube could be causing that issue or the rectifiers. I did order replacement tubes and the a capacitor to replace the on in the can. I assume the rectifiers are not likely the issue?
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#15
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I'll get to those caps later. I'm taking care of the lytic caps first. Two replaced but on the third, which does have some damage, the image gets worse with the new cap. Reclip the old and it's fine again. The values match so I am not sure the problem.
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Audiokarma |
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