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Post by mastertech on Dec 12, 2016 22:34:08 GMT -5
What is current voltage on R154?
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nashou
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Post by nashou on Dec 12, 2016 22:38:25 GMT -5
R154 -24.31
R153 ++24.33
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Post by mastertech on Dec 12, 2016 22:46:13 GMT -5
Remove TR115 and retest voltage on R154.
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nashou
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Post by nashou on Dec 12, 2016 22:49:47 GMT -5
-7.23
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Post by mastertech on Dec 12, 2016 22:53:19 GMT -5
I believe R140 is still lifted. Put it in and retest on R154
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nashou
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Post by nashou on Dec 12, 2016 22:57:39 GMT -5
I believe R140 is still lifted. Put it in and retest on R154 R154= +22.98 R153= +24.35 |
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Post by mastertech on Dec 12, 2016 23:02:40 GMT -5
Did you check the B1+/- voltages?
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nashou
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Post by nashou on Dec 12, 2016 23:04:49 GMT -5
Did you check the B1+/- voltages? they are - 24.85 and + 24.79 |
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Post by mastertech on Dec 12, 2016 23:06:30 GMT -5
Remove TR116 and test voltage on the base of tr115 and tr116.
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nashou
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Post by nashou on Dec 12, 2016 23:11:44 GMT -5
they match -23.66 .
the parts have different rankings one is an 12E the other is an 8XF , I know the last letter designates some sort of voltage ranking. Arent they suppose to be the same? TR115 is one of the new ones. I think I should replace TR116 with a similar one maybe.
one has an HFE of 169 the other 469
Nashou
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Post by mastertech on Dec 12, 2016 23:18:06 GMT -5
Yes, try just TR116 and see what the voltage is on R154. Gotta go for today. Make sure R142 is ok also.
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nashou
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Post by nashou on Dec 12, 2016 23:24:14 GMT -5
Voltage stayed the same and R142 measures fine
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nashou
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Post by nashou on Dec 13, 2016 11:15:24 GMT -5
I wonder if TR117 has something to do with it?
Nashou
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Post by mastertech on Dec 13, 2016 17:31:27 GMT -5
Something funny is surely going on especially since when you lift R139 the B1- gets pull way down however if you lift the same resistor on the other channel (R140) is does not affect the B1-.
One or more of those TR's has to be not functioning properly or of the wrong type. I am out of guesses.
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nashou
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Post by nashou on Dec 13, 2016 19:21:25 GMT -5
Something funny is surely going on especially since when you lift R139 the B1- gets pull way down however if you lift the same resistor on the other channel (R140) is does not affect the B1-. One or more of those TR's has to be not functioning properly or of the wrong type. I am out of guesses. Well I got a few I can swap out. Which reaction to lifting R139/140 is the correct one? pulling down the -B1 line or not altering it? Because TR115 was one of the ones I replaced with a new one. Basically everything on that channel I think. What If -B1 only gets pulled way down if either of R139 or R140 are lifted, not both at the same time? I do not think I had a situation where R139 was in play and R140 was lifted alone. I am at work now and need to read back to see what is in play and what is out now. 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. Nashou |
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