#46
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Don't test capacitors, just cut or unsolder one end and solder tack a new one in if you do not want to replace it right away. I'll have to dig out a schematic of your set to let you know which ones might be causing your problem.
Steve |
#47
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I have the schematics of my set as a jpg file.
Its a TS-4D If you want me to post them, or email them to you, I will do so. |
#48
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I sent you a PM.
Steve |
#49
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you also have a PM
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#50
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Pictures are worth a 1000 words! See for yourself what my problem was.
The sync issue was a bad 25mmf cap. I noticed most of the MMF caps are wax/plastic caps. Last edited by Eric H; 07-06-2004 at 10:40 PM. |
Audiokarma |
#51
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and #2
Last edited by Eric H; 07-06-2004 at 10:41 PM. |
#52
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and last but not least, picture #3.
That is the actual picture you see. Actual focus. The picture looks almost exactly the same on the face of the CRT, but its not to scale the two 4.7megohms on the plates of the vertical circuit have been replaced, but they didnt make a difference. all the high megohm resistors are well within tolerance. couple of them read exactly 10megohms. Last edited by Eric H; 07-06-2004 at 10:41 PM. |
#53
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Did you use Ceramic disc caps to replace the 6000v in the vertical circuit? That will cause this type of problem in these sets. They seem to work OK in the horiz position tho.
Check the vertical pots for continuity from end to end also, not sure how they are used in this set but I had a Hallicrafters with that problem and it was an open pot. |
#54
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Steve K told me that the reason I dont have a vertical linerity control, because each plate has the exact same waveform, but its inverse from each other, and for some reason its not the same on mine.
No, I dont have ceramic caps on the vertical stage. just the horizontal stage. I have big brown caps on the vertical stage. There old, they were already in the set, and they test fine with no leakage. So, I used them. I dont have the money to purchase anything from allied, and they can shove that minimum fee up thier a**. First, I thought one of those are bad, but I removed each one from circuit, and left the other in. Vice Versa, they both affected the picture when either one was removed. If i remove them both, there isnt any sweep. So the caps are good, and I did a capacitor check on them through my DMM, and they test alright. There isnt any leakage. Last edited by mbates14; 07-07-2004 at 11:34 AM. |
#55
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I'm still suspicious of those caps, they could be breaking down under high voltage.
PM me with your address and I'll send you a couple new ones. Eric Quote:
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Audiokarma |
#56
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Look at the waveforms on the two grids of the 6SL7. Do they look the same, but inverted (same amplitude, slope)?
The second half of the 6SL7 gets its signal from the plate of the first half, through C57, C142, R117, R58, C58 and R57. If any of these parts is bad it will result in an improper waveform on the grid of the second section, and therefore bad linearity. Last edited by Steve McVoy; 07-07-2004 at 07:38 PM. |
#57
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you do have a point there.
ill get right on it. Eric also mentioned that the HV caps could be breaking down under load. He probably is right. These are NOS caps. |
#58
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OK. I took pictures of the Oscilloscope.
The first picture here is the probe clipped to grid on pin 1: |
#59
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This is the Oscilloscope picture of the probe clipped to grid pin 4.
I dont know if its my eyes, but the P-P isnt too great as the first one. The first one looks mighty strong and healthy. The second one, its hard to tell. |
#60
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Dont ask about my oscilloscope, and why it looks that way.
I took the faceplate and scale off, because the CRT is weak, and you can hardly see the trace through it. |
Audiokarma |
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