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Post by mastertech on Dec 12, 2016 20:00:38 GMT -5
So am I to assume the B1+/- increased to 48v with that section disconnected?
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nashou
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Post by nashou on Dec 12, 2016 20:03:29 GMT -5
So am I to assume the B1+/- increased to 48v with that section disconnected? Your assumption is correct . Nashou |
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nashou
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Post by nashou on Dec 12, 2016 20:20:37 GMT -5
Looks like I might be able to put the zenner diodes back in the servo amp section and it might bring the voltage down
to the 25 we need and leave everything else out. am I correct?
EDIT: wait we need the resitors back in too i guess.
Nashou
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Post by mastertech on Dec 12, 2016 20:31:46 GMT -5
Just watch for smoke.  |
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nashou
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Post by nashou on Dec 12, 2016 20:44:38 GMT -5
Just watch for smoke. umm, umm, I think I'll pass then. I'll put the Servo section back together then, i dont think it is the issue now after I fixed the main voltage to the EQ board. Was it when I pulled R139 that it messed up the right channel? I wonder if I pull it and see what the voltage is at the E and C of TR 109 and 111 . I see where your saying it should be + to offset the - from TR115 . If I do that will it mess anything else up then? Nashou |
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Post by mastertech on Dec 12, 2016 20:49:39 GMT -5
If you pull R139 to test, also test voltage on R154 on the other channel just to see if it affects it.
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nashou
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Post by nashou on Dec 12, 2016 21:25:58 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 |
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Post by mastertech on Dec 12, 2016 21:43:07 GMT -5
What do you mean the -B1 is -10.53? Where?
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nashou
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Post by nashou on Dec 12, 2016 21:46:13 GMT -5
What do you mean the -B1 is -10.53? Where? At the main in , the connector . nashou |
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Post by mastertech on Dec 12, 2016 21:56:33 GMT -5
Pull r151 and see if that B1- returns to normal.
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nashou
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Post by nashou on Dec 12, 2016 22:08:43 GMT -5
Pull r151 and see if that B1- returns to normal. yep its up again. Nashou |
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Post by mastertech on Dec 12, 2016 22:16:25 GMT -5
Remove R140 and see if the B1- drops again.
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nashou
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Post by nashou on Dec 12, 2016 22:23:54 GMT -5
Remove R140 and see if the B1- drops again. R140 leg lifted and no difference , voltage is still correct. |
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Post by mastertech on Dec 12, 2016 22:31:57 GMT -5
Is Tr107 and TR108 still populated?
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nashou
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Post by nashou on Dec 12, 2016 22:32:32 GMT -5
Is Tr107 and TR108 still populated? yes, and I diode test them after each change and they are ok. |
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