Quote:
Originally Posted by Kevin Kuehn
OK, one step at a time here. How about you measure the voltage on the center terminal of the brightness control(alternately pin 11 on the CRT socket) to verify you have an adjustment range with a minimum of around 140vdc. This is referenced from chassis ground.
You should also see if you have 380vdc on pin 10 of the CRT socket, or if it's easier you can measure under the chassis on the end of R44 which connects to a wire leading up to pin 10 of the CRT socket. This one is also referenced to chassis ground.
If those two voltages look good you can proceed to adjusting the location of the ion trap, first try it with the brightness control all the way up. You'll need to move it around the neck as well as fore and aft. Once you get a raster you'll want to turn the brightness down so it's just visible and then find the ion trap's sweet spot that provides the brightest raster.
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OK, so how the heck do I measure the voltages of the pins of the CRT's tube socket? There's a plastic cover over it that's riveted on and I don't want to break the CRT Socket.
Secondly which center terminal is the one for the brightness control? the inner or the outer?