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Post by dolivas27 on Aug 21, 2015 5:09:17 GMT -5
Ok I removed R6451 put it all back together and tried to power it on NO GO.
Then I removed R6454 tried to power on NO GO.
I tested all the pin 9's and none have any power on them?
I swapped the Video/Speaker Terminal board from the good receiver just for a test and still NO POWER.
The only two board it can be in now are the main amp board or the pre amp board?
This one is being a bitch but it will not WIN HAHAHA LOL
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Post by mastertech on Aug 21, 2015 22:41:10 GMT -5
Ok I checked to pins for you an here is what I have Pin 129 = .580v Pin 130 = 11.39 They stay the same when the power button is pushed. Check these 2 pins again. |
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Post by dolivas27 on Aug 21, 2015 23:21:30 GMT -5
Ok do you want both resistor removed or one or none?
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Post by mastertech on Aug 21, 2015 23:49:55 GMT -5
Just the way it is. Do not put anything back that I tell you to remove without me telling you to. It creates great confusion.
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Post by dolivas27 on Aug 21, 2015 23:57:25 GMT -5
Got it give me a few minutes I need to get the other 636 off the bench I was repairing the blown channel on it.
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Post by dolivas27 on Aug 22, 2015 0:23:23 GMT -5
Ok both resistor are remove R6451 & R6454
Here are the reading they stay the same when pressing the power button.
Pin 129 = .534v
Pin 130 = .534v
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Post by mastertech on Aug 22, 2015 0:55:43 GMT -5
Can you get me the DC voltage readings of pins 140 and 138 of Q7009. While you are there you might as well get the readings of pins 130 and 129 also.
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Post by dolivas27 on Aug 22, 2015 1:12:42 GMT -5
There are zero volts on Pins 138 & 140 I already gave you pins 129 & 130 they have .534v on them.
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Post by mastertech on Aug 22, 2015 10:17:35 GMT -5
I already gave you pins 129 & 130 they have .534v on them. Haha, for some reason I thought you were testing these lines at a connector and I just wanted to verify the same readings at the processor. I guess when you are involved in so many things at the same time you can't remember who was where, lol. BUT, not usually, haha. Well at this point, since these voltages look ok we need to check some other things first. On the power supply look for the 2 wire connector (P9002) that goes to the main transformer. Put your meter probes in there set on AC voltage and see if you have 120v when the relay clicks on. We know the relay clicks but we do not know if it is making a connection. |
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Post by dolivas27 on Aug 22, 2015 19:49:51 GMT -5
Ok here is what I have on the P9002 connector before pressing the power button it's at 119.5v when I press the power button it jumps to 121.8v the relay clicks and the voltage goes back to 119.5v
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Post by mastertech on Aug 22, 2015 22:55:29 GMT -5
Well not sure why you are getting a reading when it is powered off but you do appear to have the correct power when the relay is latched on.
Moving on, we know something is going on in the amp since we had a high voltage on Vprotect. However it was odd that you did not have any DC when you checked the 5) pin 9s on each board. If this were accurate then it would indicate a bad Q6452 or Q6453. But removing those 2 resistor should allow the receiver to turn on even if these 2 were bad. So they are not likely.
So I think we should now start looking at voltages. So first check the +62v and -62v. You can check at any of those 9 pin connectors that you check the pin 9's for any DC.
Use pin 8 for ground and check pin 6 for +62vdc and pin5 for -62vdc.
And you will only have these voltages when the main relay is latched on. If you need to , you may have to jump the relay with a soldered wire if it becomes to much trouble checking these voltages.
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Post by dolivas27 on Aug 23, 2015 10:38:17 GMT -5
Ok I will check the voltages this evening.
I have a question I will need to jump the relay but I tried that in the beginning and the unit still never power on?
So at this point we think it's going in to some kind of protect right?
I removed the AMP board and tested everything on it. Not sure if I missed anything but I don't see any shorts or bad components.
Is it possible that we have a bad transformer?
After I put it back together and jump the relay should I see those voltage listed above on Pins 5 & 6?
I checked the other 636 I just fixed and the P9002 does not have any power on it with unit powered off?
Something does not seem right with this what would be causing AC voltage on that connector with the unit off?
I also disconnected the connector going to the the transformer to P9002 and measured just the pins and they still show the voltage? "STRANGE"
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Post by mastertech on Aug 23, 2015 15:33:05 GMT -5
Ok I will check the voltages this evening. I have a question I will need to jump the relay but I tried that in the beginning and the unit still never power on? That's ok, we are not looking for it to power on. We just need the transformer fully powered to check voltages.So at this point we think it's going in to some kind of protect right? Possibly, or missing a voltage somewhere. The Vpro line should of been low and it was high.I removed the AMP board and tested everything on it. Not sure if I missed anything but I don't see any shorts or bad components. The is where a missing voltage would come into play.Is it possible that we have a bad transformer? It's possibleAfter I put it back together and jump the relay should I see those voltage listed above on Pins 5 & 6? Yes.I checked the other 636 I just fixed and the P9002 does not have any power on it with unit powered off? Something does not seem right with this what would be causing AC voltage on that connector with the unit off? If the contacts are fused together inside the relay or a broken spring or if cap C9012 across the relay is shorted.I also disconnected the connector going to the the transformer to P9002 and measured just the pins and they still show the voltage? "STRANGE" |
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Post by dolivas27 on Aug 24, 2015 21:50:09 GMT -5
Quick question if I have power on the transformer should I not have voltage on P6201?
I think we have a bad transformer maybe an open thermal fuse.
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Post by dolivas27 on Aug 24, 2015 21:55:17 GMT -5
The primary of the transformer is OPEN.....
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