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Post by tibimakai on Dec 2, 2014 12:08:32 GMT -5
Yes, that is correct. It's much easier to reach there, then at the power board connector.
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Post by mastertech on Dec 2, 2014 12:24:17 GMT -5
Next you will need to test at the connector at the front board (or other end of harness if more accessible. Just be sure of pins id). As you can see in the picture, pin 34-37 are gnd. Connect your neg probe to 1 of those pins. Set DMM to DC voltage, plug in receiver but do not attempt to turn on. Using pos probe test the following pins: 2: 3: 4: 6: 7: 8: 9: 10: 11: 14: 15: 17: 18: 19: 24: 25: 26: 27: 28: 31: 33: 39: After you get these voltages force it on like you have been holding the power button and when "power on" is lit recheck these pin voltages again and see if any changed. Post the voltages.  |
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Post by tibimakai on Dec 2, 2014 15:31:12 GMT -5
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Post by tibimakai on Dec 5, 2014 1:49:42 GMT -5
Sorry for not taking the measurements, but I was busy with other things and I'm repairing an Onkyo TX-NR626, with check sp wire fault.
Blown finals, 0.22 Ohm resistor, two capacitors(10uF, 220uF), two resistors and a FR SMD transistor.
In the next two-three days, I will have the measurements.
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Post by mastertech on Dec 5, 2014 10:53:30 GMT -5
No problem. Did you find the correct part number for that FR transistor?
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Post by tibimakai on Dec 5, 2014 12:05:13 GMT -5
Somebody helped me on badcapsforum(I'm mostly there). He said that is a 2SA1037. R means hFE 180 and bigger(don't remember the upper limit).
How do you find out about these markings?
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Post by mastertech on Dec 5, 2014 18:17:10 GMT -5
Although the FR translates into a basic part the exact part number is based on the actual size of the component.
The FR can translate to:
2SA2029
2SA1774
2SA1576A
2SA1037
2SA1037AK
2SA1576UB
2SA1774EB
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Post by tibimakai on Dec 6, 2014 15:15:18 GMT -5
I'm looking at the board and the schematic and something is not clear to me.
It's like, it doesn't match the schematic with the board, or I'm not looking at it right.
I'm taking a picture in a few, but my camera battery needs charging first.
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Post by tibimakai on Dec 6, 2014 16:32:15 GMT -5
OK, here it is the picture. I don't see the 34-37 grounds.  |
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Post by mastertech on Dec 6, 2014 17:28:12 GMT -5
That is because that is the connector on the digital board. Looks like it is numbered diferently. Here is that connector. You will use 1 of pins 3 to 6 for ground and then test the following pins: 1:____ 7:____ 8:____ 9:____ 12:____ 13:____ 14:____ 15:____ 21:____ 22:____ 23:____ 24:____ 25:____ 26:____ 32:____ 33:____ 34:____ 38:____ 39:____  |
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Post by tibimakai on Dec 8, 2014 21:36:28 GMT -5
Onkyo TX-NR626 it's working great.
To me, it seems like these are failing, because the final transistors are not properly tightened.
On some, I had to tighten a half a tun(!).
Now I need to check those pins on the Pioneer.
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Post by tibimakai on Dec 8, 2014 22:16:38 GMT -5
OK, here they are:
---OFF---ON
1: 5.58V 5.57V
7: 4.76V 4.74V
8: 0V-----0V
9: 0V ----0V
12:4.84V 4.82V
13:4.79V 4.76V
14:0V ----0V
15:0V ----0V
21:5.02V 5.01V
22:4.21V 4.21V
23:dropping toward 0v
24:0V ----0V
25:3.45V 3.34V
26:0V ----0V
32:4.82V 4.79V
33:4.86V 4.86V
34:4.86V 4.80V
38:0V --+2.08V
39:-2.54V -23.27V(This is DC or AC?)
#23 keeps dropping toward 0V, on or off.
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Post by mastertech on Dec 9, 2014 20:37:08 GMT -5
In looking at these numbers I can see that your problem is not straight forward. Give me some time since I need to trace though some schematics to determine where you need to start testing.
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Post by tibimakai on Dec 10, 2014 4:00:23 GMT -5
Take your time.
I kind of gave up, on this receiver anyway.
So any help, that I can get, is very much appreciated.
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Post by tibimakai on Dec 12, 2014 22:44:48 GMT -5
It seems, like these measurements look OK?
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