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Post by brokendenon on Jul 21, 2018 12:42:49 GMT -5
Strange. I'm now getting .765v and .755v on those 2. Would cutting the ASO DET wire in half cause the different readings?
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Post by mastertech on Jul 21, 2018 13:56:24 GMT -5
It should not make a difference but you can try connecting it back together and retest. You seem to have enough voltage on there now to cause protect.
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Post by brokendenon on Jul 21, 2018 15:12:51 GMT -5
So, I wonder why it changed all of a sudden? Makes me want to go back and recheck everything!
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Post by mastertech on Jul 21, 2018 15:38:52 GMT -5
Strange. I'm now getting .765v and .755v on those 2. Would cutting the ASO DET wire in half cause the different readings? You definitely had your DMM on DC voltage and the receiver was powered on, correct? |
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Post by brokendenon on Jul 21, 2018 15:42:29 GMT -5
Definitely. Powered on, in Protection Pass mode. Everything plugged in like it should be.
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Post by brokendenon on Jul 21, 2018 15:51:46 GMT -5
I've checked it 4 or 5 times, plugging and unlpugging things... trying to replicate the first readings. No luck.
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Post by mastertech on Jul 21, 2018 20:19:55 GMT -5
I am surprised this did not show up in the idle current test.
Set your DMM to DC voltage and go to page 70 in the service manual and do the idle current test as indicated in the manual and let me know what you get. Don't do the adjustment just get the voltages.
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Post by brokendenon on Jul 23, 2018 20:59:08 GMT -5
They all start out at a couple mv and quickly go down to 0.
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Post by mastertech on Jul 23, 2018 22:19:02 GMT -5
They all start out at a couple mv and quickly go down to 0. That's odd. They should read about 6mv to 8mv. And you should not have .7v on those 2 resistors. Ok, next test. DMM on DC voltage. On that amp board I need you to take 3 voltage readings at each of the following connectors. Leave the harnesses connected and hopefully you can do the testing with everything connected properly. Fill in the voltages in the following sections. Use pin 7 in each connector for ground (neg probe) and test with pos probe at pins 1,3 and 5 of each connector with receiver powered on. CN55B - pin 1 ___, pin 3 ___, pin 5 ___. CN54B - pin 1 ___, pin 3 ___, pin 5 ___. CN53B - pin 1 ___, pin 3 ___, pin 5 ___. CN52B - pin 1 ___, pin 3 ___, pin 5 ___. CN51B - pin 1 ___, pin 3 ___, pin 5 ___. CN57B - pin 1 ___, pin 3 ___, pin 5 ___. CN56B - pin 1 ___, pin 3 ___, pin 5 ___. |
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Post by brokendenon on Jul 25, 2018 13:07:21 GMT -5
It was impossible to take measurements from the connector side with all connectors connected, so I took them from the back side where they are soldered in. And I accidentally smoked something small.... appeared to be coming from the HDMI board... I can't see where it came from... just a faint bit of smoke and smell.
Across the board, the readings are 22.6v, -.450v, 23.2v
Except for CN56B pin 3... it is -5.2mv
I only got to barely make a connection before I let the smoke out, but it appeared that pin 3 was also gonna be around 22-23v when I first started checking things. Or maybe I'm wrong.(Maybe I slipped and that's what made it smoke!)
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Post by mastertech on Jul 25, 2018 13:32:00 GMT -5
Well aside from your little slip looks like we are on to the problem. It looks like you are missing the "pre_-B" voltage. And this is putting app +22v on all speaker output lines and sending it into protect.
Unplug receiver and on same board look for and test the following with your DMM.
R5819 = 100 ohm DMM on ohm scale.
R5820 = 33 ohm DMM on ohm scale.
Q5807 look for shorted legs with DMM on diode scale.
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Post by brokendenon on Jul 25, 2018 13:37:30 GMT -5
I've been curious for a while now why everything has 22-23 volts on it lol
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Post by brokendenon on Jul 25, 2018 14:02:49 GMT -5
R5819 = 97.3 ohms
R5820 = 10.59 kilo ohms
Q5807 = .054, .052, .002
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Post by mastertech on Jul 25, 2018 14:17:14 GMT -5
Looks like R5820 is no good. That one reading on Q5807 would generally not be good but you are most likely reading through the 100 ohm resistor since it is in circuit. I would just try replacing R5820 and see what happens. If you have to buy that resistor get a couple just in case.
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Post by brokendenon on Jul 25, 2018 14:20:42 GMT -5
Yeah, I'll need to buy it. What exactly do I need? Will all 33 ohm 1W resistors be the same? And same size?
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