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Post by Michael on Aug 31, 2013 17:05:17 GMT -5
R357 and R358 close to +9.9 V on all ends.
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Post by Michael on Aug 31, 2013 17:10:08 GMT -5
Could this possibly have anything to do with the 7 wire harness that I removed and resoldered on the regulator board? I had a hard time with this and the copper strips on the board could have been damaged. It just does not look ver good ;-)
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Post by mastertech on Aug 31, 2013 17:12:31 GMT -5
Ok, you either have a bad connection on that harness that you soldered back in or the rectifier is blown.
I need you to check continuity from R355 to D351 on the board that the soldered harness comes from. Look at the board right in front of the main transformer where that soldered harness comes from. There are 2 bridge rectifiers on it. Do you remember what a bridge rectifier looks like? I posted a picture of one. The second 1 in from the edge of the receiver is D351. You can see the id on the board. The top pin of that rectifier should be a direct connect to R355. Receiver unplugged, set DMM to continuity or diode, which ever you are more comfortable with. test between that top pin and R355 and it should show a dead short. If it does not then there is a problem with the harness or the solder connection. If it does show short then post back.
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Post by mastertech on Aug 31, 2013 17:14:24 GMT -5
Could this possibly have anything to do with the 7 wire harness that I removed and resoldered on the regulator board? I had a hard time with this and the copper strips on the board could have been damaged. It just does not look ver good ;-) I was writing my other post when you posted this. Yes, it could be it was not properly connected. |
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Post by Michael on Aug 31, 2013 17:26:09 GMT -5
No short btwn top pin of D351 and either end of R355. However, when I test the D351 top pin with the first pin on the harness (+b4) I get a short reading!! That is the one that looks worst!! Any suggestion on how to repair that strip on the board?
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Post by Michael on Aug 31, 2013 17:31:40 GMT -5
I think I have to buy another iron!! I think my iron is too hot for this type of work (140W). Any suggestion on wattage of an iron? This might have actually caused the damage to the board itself!!
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Post by Michael on Aug 31, 2013 17:34:48 GMT -5
What is your work schedule for the next two days? I have to leave for a dinner party pretty soon and may not be able to complete this for tonight!
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Post by mastertech on Aug 31, 2013 18:08:07 GMT -5
1 of my irons is a 40 watt radio shack. Then I have a 30 watt for smaller work. I will probably be around, just post when your back. But your first task is to repair whatever to get continuity from d351 to R355.
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Post by Michael on Aug 31, 2013 19:27:28 GMT -5
Will do...
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Post by Michael Jani on Sept 1, 2013 14:55:13 GMT -5
Regulator board repaired. I get 19 V on either side of R355. Still when I hit the power button, display comes on and goes out.
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Post by mastertech on Sept 1, 2013 17:06:25 GMT -5
Ok, here is the pin and voltage list. Any pin number I don't give means it's a ground so don't bother testing it. Pin 1= +12v Pin 3= -12v Pin 4= +1.3v Pin 5,6,7= +5v Pin 9= -5v Do you have the +12v on pin 1? Recheck all these pins voltages. |
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Post by Michael on Sept 1, 2013 19:05:00 GMT -5
Here is my readings after the board was repaired;
Pin 1= +12.16 V
Pin 3= -11.96 V
Pin 4= +1.66 V
Pin 5,6,7 = +5.06 V
Pin 9 = -4.90 V
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Post by mastertech on Sept 1, 2013 20:45:02 GMT -5
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Post by mastertech on Sept 1, 2013 20:49:16 GMT -5
For some reason that last link is not working directly. Just copy and paste it into the address bar and it works.
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Post by Michael on Sept 1, 2013 20:57:01 GMT -5
On Tuesday, I will try a local supplier first to see if I can get them. They are not that expensive and I will prefer to get them and put them in so we can continue. Will post back once I have the parts installed.
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