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Post by mastertech on Mar 24, 2016 19:40:36 GMT -5
Well some of these you should be able to test at the connectors.
In service manual page 101, bottom of page see CN2104. Test for the v+12_a, v-12_a and v+5AD. If all good then you will need to test regulator, ic2181 for v+3R3_DA output. If you cannot access this regulator assembled then solder a wire to the output, put it back together and then test on the wire.
If all this test fine then go to connector cn2101 (page 98) and test for v+5D and v+3D. If these test fine then on the board locate R2051 and R2052 and test both for zero ohms.
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Post by hemirick on Mar 24, 2016 20:22:58 GMT -5
  Rather ask a stupid question than mess up some more....On the right side appears to be the PCB connector to do the 1st test. Which of the many grds do I use? Are the pins numbered 1 thru 7 and then 8 thru 14 ? I see (2) pins 5 and 6, v+12_a use the grdA0 next to it pin 7-8? I see (2) pins 1 and 2, v-12_a use the grdA next to it pin 3-4? I see (2) pins 9 and 10, v+5AD use the grd5i next to it pin 11? Thanks |
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Post by mastertech on Mar 24, 2016 20:34:39 GMT -5
Use GNDA for + and - 12_A Use GNDAD for V+5_AD  |
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Post by mastertech on Mar 24, 2016 20:39:52 GMT -5
Here is the dac bridge for the other connector test.  |
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Post by hemirick on Mar 24, 2016 23:13:10 GMT -5
+12 is 11.83V and -12 is -11.83, but 5V is 9.03V ??!?
On page 160 of manual I found pin outs.
I see no Dac bridge in the above post?
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Post by mastertech on Mar 25, 2016 10:13:23 GMT -5
According to the SM the 9v could be normal for your model.
Do you mean you cannot see the image in the post? I can see it.
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Post by hemirick on Mar 25, 2016 12:02:32 GMT -5
I could not see the image in Chrome, in Firefox it showed just fine thanks....I'll continue testing
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Post by hemirick on Mar 26, 2016 19:33:50 GMT -5
 Here's a photo of the topside of the board, I can get to these solder points to test....the connector at the top left is CN2104, in the middle of the photo are the 2 regulators. The 5v to the left, and the 3 volt....Can you tell me which solder point would be the output of the 3V? Thanks again Rick |
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Post by mastertech on Mar 26, 2016 20:26:01 GMT -5
You should be able to test at the circled point which should be the + side of C2181. You could also use the - leg for your neg probe if you want.  |
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Post by hemirick on Mar 30, 2016 15:33:40 GMT -5
I've acquired a fully working Onkyo tx-nr905 for cheap, since this receiver cost 4x's what the Pioneer did new, I'm going to be preoccupied with it for the next week or 2. But I will get back to this Pioneer. If you can help me upgrade the firmware on the onkyo from 1.07 to 1.09, thats my current project.
thanks
Rick
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Post by mastertech on Mar 30, 2016 22:12:54 GMT -5
I do not get involved in firmware updating.
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