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Post by mastertech on Dec 13, 2016 19:29:09 GMT -5
I feel like we are getting closer by trying different scenarios and measuring voltages. Just hard to keep track going back and forth in the thread. I agree. Just finding something different indicates a smaller location. I was just not happy that you good channel still showed a negative voltage (-7.xxv something) with the other TR and resistor removed.. I would of been happier if it had gone to zero on the good channel. But at least it did something, going from -24v to -7v by manipulating the opposite channel. |
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Post by nashou on Dec 13, 2016 20:34:13 GMT -5
I feel like we are getting closer by trying different scenarios and measuring voltages. Just hard to keep track going back and forth in the thread. I agree. Just finding something different indicates a smaller location. I was just not happy that you good channel still showed a negative voltage (-7.xxv something) with the other TR and resistor removed.. I would of been happier if it had gone to zero on the good channel. But at least it did something, going from -24v to -7v by manipulating the opposite channel. Right but back a bunch of pages when we lifted a resistor and it screwed up the good channel set us back. Because now both channels are wonky. I think it was lifting R139. That is why I think the circuit in that area acts a certain way way with either one resistor in than with both out. I think that both halves need either both in or both out, when one is in it doesnt act as we think it should.....umm does that make sense? |
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Post by nashou on Dec 13, 2016 21:11:28 GMT -5
headed home now. Im going to try to instal R139 and remove R 140 to see if we get the same result as with just R 139 lifted.
Nashou
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Post by nashou on Dec 13, 2016 21:54:00 GMT -5
Ok looked back through the last couple pages and now at the board. What maybe we forgot to look aat when we also lifted R140 was we also have R 151 lifted but not R152 on the right channel.
maybe that is why what you expected to happen didnt . Because R151 was out, and lifting R151 brought back -B1
So should I also lift R152 and R140 to match the left channel even though TR 116 is in place.
Aslo the -22.66 voltage was with both TR 115 and 116 out and R 151 but not R 152, not sure if that would alter anything.
So now this is what is out or lifted R137 and 138 , R151 and R139 and TR 115
nashou
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Post by mastertech on Dec 13, 2016 22:02:53 GMT -5
If you pull R139 to test, also test voltage on R154 on the other channel just to see if it affects it. Ok, R154 was -10 and R153 is -7.xx -B1 -10.53 and +B1 is 24.52 TR109 B +23.85 C + 23.62 E + 24.46 TR111 B +23.10 C -4,32 E +23.62 TR110 B +24.50 C +11.59 E +24.54 TR112 B +23.21 C -10.52 E +11.61 This was where your B1- went down. The only thing removed was R139 (well besides the 2 resistors for 107 and 108 for safety). |
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Post by nashou on Dec 13, 2016 22:03:07 GMT -5
Ok While waiting for the above questions to be answered I went ahead with my original Plan.
I installed R139 and removed R140 TR 116 is in and TR 115 is out as well as R151 still.
Here is what happened ,
-B1 dropped to -10.54
R154 -7.10
R153 starts at .8xx and is dropping, I stopped reading at .490 Each time I power it up it begins at last reading then continues to drop.
I feel if I lift R152 to match what we did to get the -B1 line back up it will work. Going to do that now
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Post by nashou on Dec 13, 2016 22:08:03 GMT -5
Ok Before removing R152 I have the 11.98 voltage back at TR109 and 111 where they normaly are at the emitter and collector .
R153 is now in the Milivolts 265 still dropping.
Now I will remove R152 to see if -B1 comes up
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Post by mastertech on Dec 13, 2016 22:09:00 GMT -5
Lets start over. From this point on we will consider R137 and R138 removed so no need to mention them. Put everything back in and recheck B1- to be sure it is back to -26v. Then lift R140 and recheck B1-.
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Post by nashou on Dec 13, 2016 22:13:22 GMT -5
Ok With R151, R152 and TR115 out I now have -B1 - 25.17 +b1 +25.11R153 in the 200mV range R154 + 24.38  Nashou |
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Post by nashou on Dec 13, 2016 22:16:58 GMT -5
oops R140 is also out ok Ok Ok  |
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Post by nashou on Dec 13, 2016 22:24:51 GMT -5
Lets start over. From this point on we will consider R137 and R138 removed so no need to mention them. Put everything back in and recheck B1- to be sure it is back to -26v. Then lift R140 and recheck B1-. Ok -B1 fine but after R140 lifted its down to -10.38 |
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Post by mastertech on Dec 13, 2016 22:28:39 GMT -5
Ok, so both sides do exactly the same thing. I am back to no idea.
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Post by nashou on Dec 13, 2016 22:32:35 GMT -5
Crap!!!
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Post by nashou on Dec 13, 2016 22:44:47 GMT -5
They do, I tried lifting R151 and the -B1 stayed the same. But it back in and
lifted R152 and -B1 came back.
Nashou
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Post by nashou on Dec 13, 2016 22:50:30 GMT -5
So I decided to Put R152 back in and try R150 lifted. That also brought back -B1.
Hmm.
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