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Post by tibimakai on Feb 2, 2015 1:18:32 GMT -5
Interesting, I did not get notification about your post.
I will measure these, tomorrow.
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Post by tibimakai on Feb 2, 2015 21:28:55 GMT -5
Can't do it today, my back it's hurting.
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Post by mastertech on Feb 2, 2015 22:04:00 GMT -5
Can't do it today, my back it's hurting. No problem. Take your time. I've been dragging my ass lately also. |
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Post by tibimakai on Feb 4, 2015 0:20:43 GMT -5
OK, here they are:
Pin # 2= 4.823V, #3= 4.822V, #8= 4.844V, #9= 4.801V, #14= 4.844V, #17= 4.843V, #18= 4.843V, #19= 4.843V, #20= 4.843V, #21= 0.001V, #40= 4.845V, #45= 0V, $55= 4.845V, #58= 4.825V, #64= 4.743V, #70= 4.825V, #71= 4.872V, #72= 4.219V, #78= 0.001V, #80= 4.864V, #81= 5.018V, #82= 4.802V, #83= 4.825V, #84= 0.001V, #85= 0.001V, #86= 4.826V, #87= 4.846V, #89= 4.846V
I have slipped only once, it turned off. I have restarted and continued.
I had to work, under magnifying lamp and very small tip probes.
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Post by mastertech on Feb 4, 2015 10:03:11 GMT -5
Recheck pin 84.
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Post by tibimakai on Feb 5, 2015 1:27:14 GMT -5
You were right, it was my mistake there. It is 4.819V.
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Post by mastertech on Feb 5, 2015 10:43:39 GMT -5
Ok. Pin 45 also looks funny so recheck that. And while you are right there also test 41,42,43 and 44.
Then go to pin 58 again and while holding your probe on there press the power button and let me know what voltage it drops down to. I want you to also turn the unit off but leave it plugged in and test the voltage on this same pin (58) and tell me what you have there with it off.
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Post by tibimakai on Feb 8, 2015 14:56:48 GMT -5
Sorry about the late response, but I had other more important things to do.
Here are the measurements from those pins:
Pin #41: 4.761V, #42: 0.001V, #43: 0.002V, #44: 0V, #45: 0V.
At pin #58, when it is on, I measure 4.814V.
When it is off, I measure 4.869V(?!).
I have picked up an Onkyo TX-NR636, with chk sp wire, issue. Blown final transistors. 5W resistor and some other components on the pre-amp section.
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Post by mastertech on Feb 8, 2015 19:20:43 GMT -5
At pin #58, when it is on, I measure 4.814V. When it is off, I measure 4.869V(?!). what I also needed was, when you have your probe on pin 58, press and hold the power on button and tell me what this voltage drops down to while hold the button. |
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Post by tibimakai on Feb 9, 2015 23:33:23 GMT -5
It drops to 0.024V.
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Post by tibimakai on Feb 10, 2015 0:38:21 GMT -5
Off topic, I have found some bad transistors in the Obkyo and I can't find them anywhere.
They are TTA004B(A004B), INA6006AP1(BF81W) and INC6006AP1(BE96W).
Do you know by any chance, where can I find these, or with what else I could replace them?
Thank you, Tibor.
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Post by tibimakai on Feb 10, 2015 1:05:08 GMT -5
The 2SA1507 would work in place of the TTA004B? The other question it would be, which Hfe should I have, there are two versions, one with 100 and the other is 200.
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Post by tibimakai on Feb 10, 2015 1:10:23 GMT -5
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Post by mastertech on Feb 10, 2015 18:16:37 GMT -5
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Post by tibimakai on Feb 10, 2015 21:33:39 GMT -5
Thank you, for that. I will study them.
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