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Old 04-29-2010, 06:45 PM
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droptop droptop is offline
Behind in Time
 
Join Date: Jul 2008
Location: Ooltewah, TN
Posts: 78
There is fold over within the line. The linearity is variable and looks fine except for that line. The lin coil does effect the shape of the circle like it should otherwise and the edges are smooth. Using the H setup procedure in the service notes I get between 185 & 195 ma HOT cathode current. The setting calls for maximum drive current without the presence of drive lines but not to exceed 180 ma. I’m just not sure this is a drive line because it’s present at any setting of the drive control. Regulator current varies between .8 and 1.2 depending on brightness of picture. The insufficient width varies with the setting of the lin coil. The grid voltage on the HOT is -60 volts and screen voltage +140 per the schematic. The wave forms taken at the HO grid & plate are good as well as at the grid of the HOT. I’m wondering if one of the caps shunting the yoke windings might be the culprit. Changing the connecting jumper as per the schematic has no noticeable effect on width. All the controls seem to be functioning as they should otherwise. I appreciate everyone’s attention to the color newbie.
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