nashou
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Tech in Training.....
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Post by nashou on Nov 16, 2016 20:59:47 GMT -5
No change
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Post by mastertech on Nov 16, 2016 21:08:09 GMT -5
R153 and retest.
If still no change then remove R111,R105,C103 and retest.
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nashou
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Tech in Training.....
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Post by nashou on Nov 16, 2016 21:10:12 GMT -5
Ok, the Jfet's were still good.
Nashou
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nashou
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Tech in Training.....
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Post by nashou on Nov 16, 2016 21:21:51 GMT -5
No change
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Post by mastertech on Nov 16, 2016 21:41:43 GMT -5
Just for fun pull R117. I think it will come up but lets see.
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Post by mastertech on Nov 16, 2016 21:43:38 GMT -5
Wait!
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Post by mastertech on Nov 16, 2016 21:44:47 GMT -5
Pull R113 also when you pull R117. Both out at the same time.
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nashou
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Tech in Training.....
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Post by nashou on Nov 16, 2016 21:46:58 GMT -5
K
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nashou
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Tech in Training.....
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Post by nashou on Nov 16, 2016 21:53:46 GMT -5
Ok, up to -23.9 but it blew that half of the TR107 that goes to TR105
Ugh
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Post by mastertech on Nov 16, 2016 22:03:01 GMT -5
Damn, we have it narrowed down to the 2 areas in red but the circuit needs to be active for the problem to be there. I guess before replacing that blown FET you are going to have to test the parts in the red squares individually, transistors with your tester in case it is only when active, resistors for value and caps for shorts.  |
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nashou
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Tech in Training.....
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Post by nashou on Nov 16, 2016 22:07:20 GMT -5
I can leave the resters in right? I did test many there but not all. I'll have to remove the transistros and Caps . Got it. I'm taking a break but will do some in an hour or so.
Thanks Mac. !!!
Nashou
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nashou
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Tech in Training.....
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Post by nashou on Nov 16, 2016 22:15:48 GMT -5
I guess I'll remove all transistors first, then caps then check resistors.
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Post by mastertech on Nov 16, 2016 22:23:44 GMT -5
When the transistors are out you should be able to test the resistors in circuit.
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nashou
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Tech in Training.....
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Post by nashou on Nov 17, 2016 0:01:15 GMT -5
Everything seems fine!!!! Ugh !!!!!
Except one strange thing R147 in circuit with all the transistors removed from the red area( the other transistors are still in place) measured 28k not 56k but after I pulled it it measured ok.
Nashou
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nashou
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Tech in Training.....
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Post by nashou on Nov 17, 2016 0:07:06 GMT -5
Oh, I also found that R145 is not marked on the Layout Drawing .
It should be to the right of the lettering TR111 running parallel to them. You can see the one trace with a hole empty .
Nashou
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