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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Jul 02, 2013 3:14 pm Post subject: |
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Hold on bucky. What is pulling the amp going to accomplish?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Jul 02, 2013 3:22 pm Post subject: |
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When it goes into shut down what led on the front is blinking?
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Tue Jul 02, 2013 3:47 pm Post subject: |
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Its usually the MCACC LED, I can press zone on/off and tune down buttons together and bring it back out of protection, but it will just shut down into protection again
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Jul 02, 2013 4:11 pm Post subject: |
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The flashing MCACC led is DC detection. 4.0mv on that FL is to much. It should be 2.0mv. You can try turning VR404 and see if it will stay on and see if it will adjust to 2.0mv. If not then you can try removing R549 and that should disable DC detection on the FL. Of course that's providing only the FL has a problem. You haven't gotten that far yet. That also depends on if you slipped while testing and took something else out..... 
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Tue Jul 02, 2013 4:39 pm Post subject: |
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lol, no I was quite careful, mainly since I didn't want to get electrocuted or have sparks flying in my face
I'll turn the pot down a bit and see if it will stay on, I'll report back with my findings
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Tue Jul 02, 2013 4:45 pm Post subject: |
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That isn't having any effect on the unit mac, I bring it out of protection, and everything comes up as it should, but right before you are supposed to hear the relay click for the amp the unit shuts back down. But I'm not getting the amp overheat or amp err messages anymore
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Tue Jul 02, 2013 4:54 pm Post subject: |
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And yes, I'm sure I'm on the right pot, it says FL ADJ 
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Jul 02, 2013 5:02 pm Post subject: |
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Even if you don't get the error message if the MCACC led is blinking it is DC detect.
You are probably going to have to disable protection to continue. Just don't hook up any speakers.
Do you want to just disable that FL first or all at once?
Oh, can you post a picture of the receiver with the cover off. I want to see if it's the same as the manual i have.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Tue Jul 02, 2013 5:11 pm Post subject: |
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We can do just the front left for now, I'm pretty sure that's the problem channel since that's the side of the amp that gets hot, and when I had the speaker unplugged from it it was cool, only when I had it plugged into the front left would it get hot.
I'll give you a couple of pictures, so you have a decent view, give me a few
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Tue Jul 02, 2013 5:16 pm Post subject: |
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Okay here's the pics mac
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Jul 02, 2013 8:12 pm Post subject: |
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You can try removing that resistor i posted above and see if that stops the shut down. I'll be back in a hour or so.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Tue Jul 02, 2013 11:04 pm Post subject: |
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Okay mac, I know it took a while longer than it should have, I am also messing with an AVR-3808CI that has a tone control issue
Anyway, on the pioneer, I pulled one of R549s leads and the receiver clicked on and stayed on. So that reconfirms the left channel is the problem.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Tue Jul 02, 2013 11:13 pm Post subject: |
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And at least I can enjoy the internet radio coming off of it again while we do this
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Jul 02, 2013 11:27 pm Post subject: |
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Can you put your meter on that TP again and see if the adjustment will bring it to 2.0mv? Check the others also since it's on now.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Tue Jul 02, 2013 11:39 pm Post subject: |
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Mac, I'm trying to adjust the pot to 2.0mv, the test point is reading like it should, it reads 3.3mv, but I can't adjust it, it wont go up or down at all.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Jul 02, 2013 11:41 pm Post subject: |
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Then there is a problem in that circuit. You will have to do some individual component tests. let me look up what parts.
How did the other channels test?
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Tue Jul 02, 2013 11:44 pm Post subject: |
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Hold on mac, I was checking the wrong test point, dammit, give me a minute... for the record the 3.3mv is coming off the front right channel (and I double triple checked)
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Tue Jul 02, 2013 11:55 pm Post subject: |
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okay, to clarify all that confusion above,
The 3.3mv was coming off the SL channel on the amp, I set that down to 2.0mv, the L channel (problem channel) read 2.3mv, I set that to 2.0mv, and so far the rest of them, including the front right reads 2.3 to 2.7 mv, I've set them all to 2.0mv, so whats next?
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jul 03, 2013 12:14 am Post subject: |
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Well, first thing I want to do is apologize for running you all over the schematic due to my confusion, sorry about that.
Second, I THINK its fixed mac, adjusting the bias cooled it right down, its played through 2 songs at a loud volume and the heatsinks are nice and cool like they should be.
I would assume I should just put the resistor back in circuit and give it a go afterwards to make sure it stays working?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jul 03, 2013 12:19 am Post subject: |
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| Jeremy112 wrote: |
I would assume I should just put the resistor back in circuit and give it a go afterwards to make sure it stays working? |
Yep... Also, after running it for about an hour or so, recheck the voltage on all those TP's and make sure they didn't drift off. If any are off just reset. Procedure calls for a half hour warmup before adjusting.
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