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Post by tokejo on Jan 26, 2014 18:13:20 GMT -5
Ok, everything back together, plugged it in and it powered right up. Connected an AM antenna and a single speaker to the left front channel and was able to get the Hawks game.
Now to fix the front right channel?
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Post by mastertech on Jan 26, 2014 18:13:40 GMT -5
If all 3 legs of both those shorted transistors are cut, sure, try it.
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Post by mastertech on Jan 26, 2014 18:15:37 GMT -5
Oooops, missed your post. If you want to test the amp out of the other receiver just make sure to do the diode test on all the outputs first.
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Post by tokejo on Jan 26, 2014 18:37:16 GMT -5
What's the next step on this one? I couldn't figure out how to complete decouple the heatsink/board from the rest of the boards because of all the ribbon cables, but I got it loose enough that I could check out the underside of the board. I should be able to desolder those six snipped leads tomorrow.
Hold off on ordering replacement transistors until we determine if any other parts are faulty?
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Post by mastertech on Jan 26, 2014 18:56:37 GMT -5
Yes, the next step would be to test some parts in that local circuit to make sure nothing else needs to be replaced. I will look over the schematics and give you a small list of what needs to be checked. give me 15 minutes.
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Post by mastertech on Jan 26, 2014 19:09:57 GMT -5
R6101 - 0.22 ohm between center and 2 outer legs.
Q6111, Q6101, Q6031, Q6041, Q6011, Q6001, Q6071
D6001
R6301 and R6291 - 2.2ohm
R6261 and R6251 - 120ohm
R6271 and R6281 - 18ohm
R6071 - 82ohm
R6311 - 10ohm
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Post by tokejo on Jan 26, 2014 22:18:30 GMT -5
I'll get back to this after work tomorrow (and measure the transistor values on the other AVR).
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Post by tokejo on Jan 26, 2014 23:10:36 GMT -5
I can't see any markings on the transistors that I pulled. Does your paperwork list what they are?
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Post by mastertech on Jan 27, 2014 10:02:22 GMT -5
I can't see any markings on the transistors that I pulled. Does your paperwork list what they are? Yes. I'll look up the numbers when we are ready after you check the other parts and other amp. |
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Post by tokejo on Jan 27, 2014 13:11:36 GMT -5
The last box arrived this morning. I'll take a look at it, and the contents, this afternoon.
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Post by mastertech on Jan 27, 2014 13:24:23 GMT -5
OK
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Post by tokejo on Jan 27, 2014 18:02:13 GMT -5
None of the transistors on the 2nd AVR appear to be blown, values are similar to the first AVR.
Starting on those resistors/transistors for the first AVR.
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Post by tokejo on Jan 27, 2014 18:55:19 GMT -5
R6101 -OL Q6111 - OL Q6101 - 784 (2-1), 755 (2-3) Q6031 - OL Q6041 - 784, 755 Q6011 - 7.3, 14.3, 13.9 (1-3) (maybe I was measuring this on on the Ohm scale and not diode?) Q6001 - Couldn't get to it Q6071 - OL D6001 - Couldn't Find R6301 - 2.4 and R6291 - 2.4 R6261 - 118.0 and R6251 - 118.5 R6271 - OL and R6281 - 21.9 R6071 - OL R6311 -10.2 I had reassembled everything to power it back on, I will disassemble as much as possible to get to Q6001 if necessary. |
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Post by mastertech on Jan 27, 2014 19:28:41 GMT -5
Ok, first just a clarification. All Q's (transistors) and D's (diodes) get tested with DMM on diode scale.
All R's (resistors) get tested on ohm scale.
Second: lets not worry about Q6001 for now. I would guess it is ok based on some of these other readings.
Third: Based or your readings this is what I see:
R6101 = bad
R6271 = bad
R6071 = bad
I am curious about Q6011 if you could re-verify.
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Post by tokejo on Jan 27, 2014 19:39:58 GMT -5
Q6011
1-2 - 11
2-3 - 22
1-3 - 23
Tested with DMM on diode scale.
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