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Post by robin36mac on Mar 6, 2019 8:47:01 GMT -5
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Post by whiterabb1t on Mar 6, 2019 8:49:26 GMT -5
Unfortunatly i don’t have other controller, i only have the other 3 board  |
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Post by Decibel on Mar 6, 2019 11:32:36 GMT -5
If the issue is in the convergence's board we should look for it in a common element because it occurs on all colors.
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Post by whiterabb1t on Mar 7, 2019 14:28:06 GMT -5
Hi guys! I have done other test, i have replace the focus/astigmatism/convergence board and the result is the same... i don’t have an other controller board for test... but i suspect is this the problem... what test can i do for confirm it?
For now, i follow the bulletin and change the resistor of the convergence, for blue oscillation problem
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Post by Decibel on Mar 8, 2019 4:00:43 GMT -5
It seems that there is a modify to be made on the controller. I found on my controller two strange changes. I do not think they are interventions done by Barco.   |
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Post by whiterabb1t on Mar 8, 2019 7:33:20 GMT -5
Hi, i already have the modify on the controller   |
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Post by Decibel on Mar 10, 2019 10:26:17 GMT -5
Curt said that's a issue of the controller. He has no doubts and he has a lot of experience. But I do not understand why if we detach the convergence's board the defect disappears.
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Post by robin36mac on Mar 10, 2019 11:35:12 GMT -5
Because it is the controller that generates the convergence waveforms, and the convergence board is "just" an power amplifier of the convergence signals, sending them to the convergence coils.
If we remove the convergence board, or detach the convergence coils, they are not driven anymore so the defect disapear.
But the issue seems well to be in the generation of the convergence signal, which is done by the controller.
Robin
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Post by whiterabb1t on Mar 10, 2019 12:45:30 GMT -5
And how can i find the exactly problem?
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Post by hulio on Mar 10, 2019 13:36:08 GMT -5
You can't, without trying another controller. Swap it with the one from the spare 909.
From the pictures of your controller it seems that those trimpots lost their sealing (red varnish) and drift. Even with a very good oscilloscope and the service manual, is not an easy task to tweak them back.
Try another controller.
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Post by Decibel on Mar 10, 2019 14:15:46 GMT -5
You can't, without trying another controller. Swap it with the one from the spare 909. From the pictures of your controller it seems that those trimpots lost their sealing (red varnish) and drift. Even with a very good oscilloscope and the service manual, is not an easy task to tweak them back. Try another controller. So that controller will be unusable forever? |
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Post by mastertech on Mar 10, 2019 15:03:25 GMT -5
I think at this point it is to soon to say unusable for ever. As a few here have already said it would be best to verify it is definitely the controller first. And then if it is verified to be the controller I would not condemn it right away. There are to many things in the convergence circuits on the controller that can cause the problem without it being tied to those pots. In fact they would be way near the end of my thoughts of possibility.
At this point and it has already been asked but not answered, have you neutraled out "ALL" adjustments and deleted "ALL" memories and inputs?
INCLUDING, E/W and N/S corrections since these are used for references in the convergence circuits.
Too many times I have seen convergence anomalies fixed by just removing all previous memories and adjustments or a reset.
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Post by whiterabb1t on Mar 11, 2019 8:24:20 GMT -5
I think at this point it is to soon to say unusable for ever. As a few here have already said it would be best to verify it is definitely the controller first. And then if it is verified to be the controller I would not condemn it right away. There are to many things in the convergence circuits on the controller that can cause the problem without it being tied to those pots. In fact they would be way near the end of my thoughts of possibility. At this point and it has already been asked but not answered, have you neutraled out "ALL" adjustments and deleted "ALL" memories and inputs? INCLUDING, E/W and N/S corrections since these are used for references in the convergence circuits. Too many times I have seen convergence anomalies fixed by just removing all previous memories and adjustments or a reset. i have reset all memories and set all to midpoint, unfortunatly i don't have other controller for test... |
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Post by whiterabb1t on Mar 13, 2019 14:12:08 GMT -5
Hey guys! do you have any ideas?
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Post by hulio on Mar 13, 2019 19:04:53 GMT -5
Hello Setefano, I can borrow you a good working controller if you wish, just to see if yours is at fault. You'll have to pay only the shipping costs. I really can't miss him (is my spare controller), so you'll have to send him back.
Send me a PM with your address, in case you agree.
Cheers, Stan.
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