National rear projection

[moreday]

I am repairing a National rear projection TV from the 80's and need some info.
The voltages to the screen grid pots which i assume to be 1000 and 200 on both sides are a bit low ... 700 and 170v respedctively.
The focus cannot be adjusted to a fine line though the pots are working. I found ONE dried electrolytic 10uF/250v... But this did not cure the problem.

I do not have a service manual or a diagram ... so I need some info on this. Model: TC 43000 (National)

So anyone out there ... drop me a line ... if u can help me in any way..

Thanks
Mohamed

 

[Xerotrace]

I can't help you (sorry) but how big it is? model number? inputs? Pictures would be great. I would like to see how big it is.