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Post by dolivas27 on Oct 22, 2015 6:30:17 GMT -5
Ok I am working on my First Onkyo TX-NR646.
The receiver is in protect mode when I power it on it comes up NG:LCRSLSRBLBR If I press the Enter key to display the protection cause it shows that the unit has a DET. PROTECT : I
So with that information I can see that the unit is in current detection.
Looking over page 40 in the service manual it looks like it could be one or all the channels causing the fault?
I have tested all the output transistor and they test good.
I have also tested all the IPROTECT Resistors on the channels. Example tested from C6050 to Pin 1 of P6080 = 24.2k (R6150 2.2k + R6130 22k) This is on the L Channel the other were tested the same way.
I have tested Pin 129 of Q7009 and it does have .5v on it so it is receiving a IPROTECT shut down from one of the channels.
Before I pull the amp board out to test all the components in the the protect circuit is there a easy way to narrow down the offending channel or channels.
If you could explain how the IPROCTECT circuit works that would help. You can use the Left channel as an example.
Thanks
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Post by mastertech on Oct 22, 2015 15:21:44 GMT -5
What do you think you should have at pin 129 of Q7009?
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Post by dolivas27 on Oct 22, 2015 15:27:42 GMT -5
Well I thought it should be Zero but after looking over everything I think the .5v is probably OK as it is still pulled low. I am really trying to understand how the protect circuit works.
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Post by mastertech on Oct 22, 2015 15:54:57 GMT -5
I will get to that in a minute. Did you try to clear the NG info?
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Post by dolivas27 on Oct 22, 2015 16:10:55 GMT -5
No I have not I did not want to blow anything else up.
I will try to clear it now and see what happens.
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Post by dolivas27 on Oct 22, 2015 16:29:20 GMT -5
Well That worked the unit seems to be working fine now?
After I cleared the NG Info the unit went through a Amp test and then came back with a CHECK SPEAKER WIRE.
I powered the unit off and then back on and it power up fine. Playing music on it right now.
So the Million Dollar question it looks Onkyo added extra protection in these new units (The 626/636 Line would have blown the channel if shorted.)
This unit went in to protection and once cleared and I am assuming the speaker short removed the AMP passed the turn on test.
Does that make sense to you or should I be looking for another problem?
I am wondering if I should still pull the Amp board and look at it if the solder work is anything like the 626/636 I have been working on I wonder if there was a loose solder ball causing the short?
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Post by mastertech on Oct 22, 2015 19:29:38 GMT -5
Some receivers go into a protect mode if the speaker wires are bumped together and do not come out unless they are reset. I would check all the speaker outputs for any DC just to see if there are any borderline.
You may want to check the idle current also even though it does not look like it is adjustable.
Also, do you want to recheck the reading of pin 129 or don't you want to mess with it since it is working?
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Post by dolivas27 on Oct 24, 2015 2:02:41 GMT -5
Ok I updated the Firmware from 1010-0010-0101 to the current firmware 1040-2030-0102
I have been using the unit for the last 48 hours and it has performed excellent and I have pushed it hard at times.
Question on checking for the DC voltage one the speaker outputs. I am assuming that the unit should be on and I use a VOM should there be any DC at all?
Here is what I get with the Receiver on and the volume set to zero. Why would I be seeing a negative voltage? So the voltage is extremely low does this look Ok or should it be zero?
Speaker Terminal DC Voltage
Center -0.008
Front Left -0.005
Front Right 0.020
Surround Left -0.033
Surround Right 0.002
Back Left 0.006
Back Right 0.002
Zone 2 Left 0.006
Zone 2 Right 0.002
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Post by mastertech on Oct 25, 2015 9:39:20 GMT -5
Yes, unit on and meter on DC, just like you did.
You are seeing some neg numbers cause the amp circuit uses both pos and neg voltages to operate. Your numbers look fine. Interesting that the RF and SL are a tad more then the rest but that is very common. I have never seen a problem with those 2 higher readings and some even run higher across all channels. It could be that the idle current is a tad off which is why I said to check that also but it does not appear to have an adjustment. And unless you have an idle current that was off by quite a bit I would not bother with it.
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Post by jimkarl on Nov 16, 2015 3:10:08 GMT -5
How do you actually clear the NG:LCRSLSRBLBR message/state?
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Post by mastertech on Nov 16, 2015 17:52:49 GMT -5
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Post by tibimakai on Apr 5, 2016 20:34:26 GMT -5
I have "repaired" a 545, with the same error, just by resetting the receiver.
Now I have just received a 646 with NG: L R and by redoing the amp test, now I'm getting L RSL.
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