Quote:
Originally Posted by vortalexfan
OK so I do have high voltage to the picture tube anode cap, but still no raster, although I've noticed that when I turn the brightness control I get a raster for a split second before it goes away again, so I'm guessing it's like what what Kevin was saying earlier, I may have to adjust the ion trap to get a raster on this thing.
But it seems that everything is good to go as far as everything running goes, except that I still don't have audio except for the sound of the HV section coming through on the speaker, which means the Sound IF may be out of alignment, I'm not sure about the Video IF sections or the Tuner and whether or not those are in need of alignment or not, I won't know until I can get the picture tube to produce a picture.
|
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.