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Author Topic: Canít find screen POT  (Read 186 times)

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vandale

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Canít find screen POT
« on: March 20, 2018, 07:31:02 am »
Hi. I have a taito New Zealand chassis and the image is far to bright. There are no focus or screen pots on the fly back. There is a focus pot on the neck board and this works fine. I have tried adjusting the brightness and contrast but itís far to bright as I can see bright green lines in front of the image. Usually I would adjust the screen pot until it was black then introduce brightness and contrast etc however I cannot locate a screen pot. Please help. Pics of boards attached. Thanks

Ken Layton

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Re: Canít find screen POT
« Reply #1 on: March 20, 2018, 11:42:27 am »
The "G2 SET" trimpot is your screen control on the neck board. Use a well insulated screwdriver as the screen voltage is between 400 to 800 volts!

vandale

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Re: Canít find screen POT
« Reply #2 on: March 20, 2018, 03:49:51 pm »
The "G2 SET" trimpot is your screen control on the neck board. Use a well insulated screwdriver as the screen voltage is between 400 to 800 volts!

Hi, thanks however I tried that pot and it made no difference at all 😞

Maybe it needs a new pot? Or can I just spray it with contact cleaner etc?

Thanks

princess prin prin

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Re: Canít find screen POT
« Reply #3 on: March 21, 2018, 03:31:15 am »
G2 voltage is derived from focus voltage but it's not clear what's connected to the focus pot. Where does the blue wire go? Pic of the underside of the neckboard would be useful too.

  
 

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