Monochrome Computer CRT Brightness

[lnx64]

Looks like it may be made by Panasonic. Chassis number 12Y08-4 seems to come up as such.

[TinCanAlley]

Originally Posted by lnx64

Looks like it may be made by Panasonic. Chassis number 12Y08-4 seems to come up as such.

Well I managed to find a factory setup manual, but it doesn't have the exact CRT. The manual covers a few different size CRTs as well as a couple different control board configurations (one for direct input and one for composite). So I went to the one that was the closest to the monitor I have. It has roughly the same voltages on the tube as I measured on mine. It states that with the panel brightness all the way up, adjust sub bright until raster shows up, then back it until it is almost gone.

Since this thing has 628V on the G2, and G1 has to go down to roughly -2V to bring up an image, the CRT must be toast. I tried to rejuvenate it, but for some reason my BK 470 will not setup properly. I set is as should be, but I can't get the needle to move setting up. I set up the G1 voltage @ 50, but can't set the G2 cutoff as it should show a movement in the needle on division. It doesn't move and it shows bad during the emissions test. Now when I do the same on another 12" monochrom CRT, using the same socket and settings, it also doesn't move setting the G2 cutoff and emissions test is bad. However, this monitor works perfectly and has a bright raster with the internal sub bright only half way and the front control at full. So there must be something wrong inside my tester. Will have to see how to diagnose it.

https://archive.org/details/manual_M...M_PANASONIC_EN