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Post by mastertech on Sept 5, 2013 12:29:39 GMT -5
Repair looks ok. And I guess your sure the transistor and/or diode are not in backwards.
When you get the parts for the amp and have the board removed I want you to retest each output transistor and compare it's reading to the other output transistors. Meaning, test all the 2sc's and see if the readings are the same on all of them on each leg test. Then test all the 2sa's while comparing readings. This will include the replaced ones. Test and compare legs like you did when testing Q301. And I want you to do this with them installed, not removed.
Pins 1 and 2=
Pins 1 and 3=
Pins 2 and 3=
Reverse probes:
Pins 1 and 2=
Pins 1 and 3=
Pins 2 and 3=
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Post by Michael on Sept 5, 2013 13:02:27 GMT -5
Can you explain what do you mean by "2sc's" and "2sa's"?
Do you want me to install the nee output transistors after I tested the other transistors?
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Post by Michael on Sept 5, 2013 14:26:09 GMT -5
Can you explain what do you mean by "2sc's" and "2sa's"? Do you want me to install the nee output transistors after I tested the other transistors? I guess you are referring to the part numbers of the toutput transistors! I should be getting them shortly and will perform the test.. As far as D301 and Q301 I will email a picture to you from the other side of the board. |
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Post by mastertech on Sept 5, 2013 16:40:01 GMT -5
Yes, I was referring to the output transistors part numbers. They are in groups of 2, 5 of 2sa's and 5 of 2sc's.
After you remove the amp board and the new transistors are soldered in but before you put the board back in, do the testing and comparing.
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Post by Michael on Sept 6, 2013 8:45:08 GMT -5
Ok. Here where we are now;
Got the parts.tested them before and after installation. All the test results are consistent with all other output transistors. I'm not sure if you want me to post them or not but I can. I recorded them on the paper. Put all the boards back in their place(have not secured them with the screws yet). Plugged the unit to the power.I get all of my voltages where I should get them. When I press the power button, the display comes on and stays on longer (about 3 seconds) and goes out. I don't hear the relay click but the jumper for the relay is still in place.
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Post by mastertech on Sept 6, 2013 8:57:11 GMT -5
No need to post them if they were all comparable with each other. I would only need to know if there was 1 or more transistors with different readings then a comparable part.
As to the next step, well when it comes to audio equipment, ALL screws must be installed in order to test. There are only a few occasions where you can test a unit with less then all screws installed and only when the service manual indicates so. So start there and then we can continue. But don't worry about the cover. That is not needed.
When you say you have all the correct voltages does this mean S12 and PRY?
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Post by mastertech on Sept 6, 2013 8:58:35 GMT -5
Oh, you do have the red and blue wires connected that you previously cut, right?
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Post by Michael on Sept 6, 2013 9:14:33 GMT -5
Ok. Here where we are now; Got the parts.tested them before and after installation. All the test results are consistent with all other output transistors. I'm not sure if you want me to post them or not but I can. I recorded them on the paper. Put all the boards back in their place(have not secured them with the screws yet). Plugged the unit to the power.I get all of my voltages where I should get them. When I press the power button, the display comes on and stays on longer (about 3 seconds) and goes out. I don't hear the relay click but the jumper for the relay is still in place. I removed one leg of the jumper from the relay, plugged the unit, display does not come on at all. I still didn't hear any click from the relay when I hit the power button. |
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Post by Michael on Sept 6, 2013 9:21:33 GMT -5
Oh, you do have the red and blue wires connected that you previously cut, right? Yes, red and blue are connected. MG to S12 17.1 V. PRY has 0.7 mv. I'm going to put all screws in place now. |
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Post by Michael on Sept 6, 2013 9:37:01 GMT -5
Oh, you do have the red and blue wires connected that you previously cut, right? Yes, red and blue are connected. MG to S12 17.1 V. PRY has 0.7 mv. I'm going to put all screws in place now. BTW, I do get 17 V on S12 both on power board and CB510 (3rd pin on top ). |
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Post by Michael on Sept 6, 2013 10:04:10 GMT -5
All the components are secured to their place now. Display still stays on for 2-3 seconds. I sent you am email earlier with the picture of Q301 and D301. Did you have a chance to see that?
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Post by mastertech on Sept 6, 2013 12:07:54 GMT -5
Yes i got the pic and it looks fine.
I need you to unplug the receiver, set Your DMM to diode scale and test across PRY and MG and give me the reading. Reverse probes and check again.
Also test across MG and chassis ground.
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Post by Michael on Sept 6, 2013 14:47:39 GMT -5
On CB510, PRY to MG 0.020 V both ways and MG to chassis ground 0.000.
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Post by mastertech on Sept 6, 2013 14:57:37 GMT -5
Remove R301 on the fuse board and check PRY to MG again. Lifting 1 leg on R301 is fine of you don't want to remove the whole thing.
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Post by Michael on Sept 6, 2013 15:09:36 GMT -5
R301 with one leg removed, 0.020 V both ways.
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