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Post by mastertech on Sept 2, 2016 19:15:11 GMT -5
What is, "barely any voltage"?
Did you also test R551 and Q417?
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Post by fuxtor on Sept 2, 2016 19:46:16 GMT -5
Sorry for vagueness.... Approx. 0.01 dcv.
I will double check what you have suggested....
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Post by fuxtor on Sept 2, 2016 20:28:57 GMT -5
What is, "barely any voltage"? Did you also test R551 and Q417? R551 is measuring 975 ohms Q417 is reading good with diode setting... Been checking all transistors in this area and they are all coming up reading good... |
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Post by mastertech on Sept 2, 2016 20:43:20 GMT -5
R551 should be reading 100 ohms. Remove it and then recheck Q417. It should not be testing ok while R551 is in circuit.
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Post by fuxtor on Sept 2, 2016 21:50:29 GMT -5
R551 should be reading 100 ohms. Remove it and then recheck Q417. It should not be testing ok while R551 is in circuit. My mistake, it is 97.5 ohms.... And yes it measures good after removing R551.... |
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Post by mastertech on Sept 2, 2016 22:10:39 GMT -5
ok, that should be fine then. Put it back in.
On that amp board locate connector CN404 and with it plugged in and after attempted turn on, test for DC voltage on all lines on that connector and let me know what you get.
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Post by fuxtor on Sept 2, 2016 22:59:55 GMT -5
Pin 1 reads 0 dcv
Pin 2 reads 0 dcv
Pin 3 reads 0 dcv
Pin 4 reads 0.615 dcv
Pin 5 reads 0.615 dcv...
Pin 5 being thermal det.
Voltages remained the same powered on as off.
During this power up, R486 burnt up!
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Post by mastertech on Sept 3, 2016 10:55:16 GMT -5
What size resistor was in R486? Schematic calls for a jumper.
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Post by fuxtor on Sept 3, 2016 12:08:09 GMT -5
I believe that R487 was a 47 ohm..
I see no jumper???
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Post by fuxtor on Sept 3, 2016 12:10:07 GMT -5
I just noticed I previously wrote R 486 ?? It's actually R487.... My apologies!
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Post by mastertech on Sept 3, 2016 14:46:53 GMT -5
If R487 is smoking then something is bad in the RF channel, most likely something in this box.  |
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Post by fuxtor on Sept 4, 2016 14:26:09 GMT -5
I will go over these components! Thank you
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Post by fuxtor on Sept 5, 2016 13:14:15 GMT -5
Ok, replaced all the outputs in RF channel and discovered a bad diode and replaced.
Reassembled and R487 burnt again as well as R482 and R782..... Make anything of the other resistors frying this time?
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Post by mastertech on Sept 5, 2016 19:11:02 GMT -5
I am not seeing R782 in the schematic. Where is it located?
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Post by fuxtor on Sept 5, 2016 20:00:11 GMT -5
Ok, dyslexia is setting in I guess....so sorry, it is R 718, and could be possible it is charred because it it mounted beside R 487...
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