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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sat Jun 17, 2023 12:42 am Post subject: Barco C7 image jitter |
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P11
P676
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296.41 KB |
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4461 Time(s) |
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sat Jun 17, 2023 12:44 am Post subject: Barco C7 image jitter |
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P12
New P676 Potentiometer
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151.75 KB |
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4460 Time(s) |
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sat Jun 17, 2023 3:45 am Post subject: Barco C7 image jitter |
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After replacing the P676 Potentiometer, the image looks normal
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148.41 KB |
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4451 Time(s) |
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Hulio
Joined: 15 Apr 2006
Posts: 494
Location: Belgium
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| Posted: Sat Jun 17, 2023 9:15 am Post subject: |
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Well done. Yeah, those trimpots loose impedance over time. Because of age, or that red sealing varnish they put on.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sat Jun 17, 2023 9:23 am Post subject: |
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Unfortunately, the problem of image rolling was not solved after the P676 Potentiometer was replaced. I need to repeatedly adjust the P676 Potentiometer every time to obtain a stable image. It seems that there are other problems in the deflection board.
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Hulio
Joined: 15 Apr 2006
Posts: 494
Location: Belgium
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| Posted: Sat Jun 17, 2023 11:56 am Post subject: |
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If the new pot is not stable neither, replace elco C716 (10uF 35V).
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sat Jun 17, 2023 2:24 pm Post subject: Barco C7 image jitter |
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[quote="Hulio"]If the new pot is not stable neither, replace elco C716 (10uF 35V).[/quot
before, I replaced all the capacitors on the deflection board！
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sat Jun 17, 2023 2:29 pm Post subject: |
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C716 has been replaced by a new capacitor（10uf 50v）too
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sat Jun 17, 2023 2:42 pm Post subject: |
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I replaced the Electrolytic capacitor on the deflection board.
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Hulio
Joined: 15 Apr 2006
Posts: 494
Location: Belgium
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| Posted: Sat Jun 17, 2023 2:50 pm Post subject: |
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Ok. I see in the schematics that C715 can affect the V hold too (blue rectangular cap, closer to the trimpot). The value is 0,1uF 63V.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sat Jun 17, 2023 3:04 pm Post subject: |
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| Hulio wrote: | | Ok. I see in the schematics that C715 can affect the V hold too (blue rectangular cap, closer to the trimpot). The value is 0,1uF 63V. |
Okay, there's a high possibility of this
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sun Jun 18, 2023 2:58 am Post subject: Barco C7 image jitter |
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pic13
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106.17 KB |
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4396 Time(s) |
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sun Jun 18, 2023 3:02 am Post subject: |
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| Hulio wrote: | | Ok. I see in the schematics that C715 can affect the V hold too (blue rectangular cap, closer to the trimpot). The value is 0,1uF 63V. |
The C715 has been replaced, and the problem seems to have been resolved.
Thanks!
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Hulio
Joined: 15 Apr 2006
Posts: 494
Location: Belgium
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| Posted: Sun Jun 18, 2023 7:50 am Post subject: |
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Alright, well done.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sun Jun 18, 2023 10:48 am Post subject: |
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The image did not roll when turned on, but there was a slight vertical misalignment when changing the signal source. This should not be a problem, everything else is very good。
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