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The squeal was probably from the horizontal (around 15.75 KHz). That smoke came from something - hopefully just a resistor. The HOT might have been getting too much drive and smoked one. Is your set fused ? If so, did the fuse blow ?
Generally, you could swap a wire from one end of a pot to the other, unused end. Of course, the control would work backwards then. Could you scan or take a picture of that area of the schematic and post it ? |
Thats what I thought with the pot. It will work backwards though. Thanx.
I have checked most of the set out and I did find a few resistors that I know were fine before, that I had to replace. I took apart the tuner cleaned everything up, replaced resistors and left the clicker ball alone. Yes it is the same as Pielocks (same problem too) but I figured that I wanted to get the set up and going first. Besides as long as channel 3 works I'll be happy for a while until the cabinet is complete. I have one problem I have been fighting since before I powered up. I'm sure its just a good old fashion short somewhere materializing in the Vertical output tube. I'm pretty sure this is what caused the smoke. If I get too frustrated I will download everything needed for help but for now I am going to keep going it alone sort of speak. Thank you for the offers of help and I'm sure I will need them sooner or later but as long as I am still enjoying myself and not so frustrated I want to put my head through a wall, I'll be fine. |
Also, yes the set is fused and the fuse did not blow. 1/4 amp I believe.
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Found my problem. The vertical Blocking Osc. Transformer (T2) is showing infinite resistance. It wasn't completely infinite until I started wiggling wires and saw how irratic my resistances throughout were. The wires were all crumbly and basically gone and I hoped the problem may be just outside the transformer and I thought maybe I could just pull it out and resolder exterior wires if I was lucky. I'm actually even luckier than that though! I found a NOS transformer. Inexpensive too! Done working on this until I get the part or I find out I can't get it. (Waiting for confirmation now). Out of time now but I will post the schematic along with what I figured happened in the next day or so.
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Transformer is on its way!
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1 Attachment(s)
I finally have part of a schematic in this post. What a pain. Adobe is what makes it difficult. I printed out a PDF and rescanned it and attached it as a JPEG.
Attachment 167588 Here is the area around the transformer. If someone else has something else they think might cause eratic resistance and eratic voltage on pins 1 and 5 on V 15 and V 18(only) respectitively, I'm all ears. |
1 Attachment(s)
In regards to the previous problem several days ago where I referred to the Horizontal output I'm still thinking somethings not quite right. This tube is V20 just to the left of the Flyback which is just to the left of the Rectifier & Damper tubes. The resistance on pin 1 is 200K it should be Infinite. R121 is mounted to pin 1 and per the notes R121 is a 220k Resistor not 470K in this application. Also Pin 5 is low about that same 200K. Whats making it difficult is the Optional width relay as shown in the second attachment. I replaced the 560 MMF cap C94 and the 47 ohm R120 tests fine. I don't think R121 should be there but where should it go? Whats making it difficult for me is the Variable capacitor shown as the Horiz Drive. Resistance readings are different on each side by close to that same 200K. Please also take a look at the Optional width Adjustment on the next attachment too it does take precedence when the two conflict. This circuit just starts to intermix with this in that area. Any suggestions would be helpful.
Attachment 167590 I'm sorry the width adjustment is above in the previous post. Thanx |
You know the resolution sucks on these. If interested I can email the whole Sams PDF. Its only about 8 MB. I couldn't figure out how to download it here.
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