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#1
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after a longer viewing time I went to adj the focus, the plastic adj piece was very loose in the bore of the coil. I had noted before that when cold the focus is frozen, after a few min the adj loosens up and feel normal now when hot it practically falls out.
the Horz defection coil blue lead it tied to this coil.... hmmmm I checked the resistance, 1.6 ohm should be 30. now this is with it in circuit, but I see nothing across it that would reduce the resistance but for a 100k resistor so unless that is shorted I would not expect to see this. I have a new coil on order. Perhaps this will finally address the underscan, yes I got it to fill out the screen by careful adj of the centering control and careful selecting of horz tubes, but I think it should not be this critical, so perhaps a shorted coil would result in an impedance mismatch in the horz circuit that could put a drag on the fly. I check the waveform and PP on some other stuff like the horz blanking signal which comes off this coil, it was way down from spec too like 40% low. |
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#2
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dumb me did not see that the focus coil was across a fly winding, after taking it out of circuit it checked fine. Darn... i will try a new one anyway since this one is all gummed up with a waxy stuff that make the adj gooey.
I also set up the chassis to do a B+ current check. I may end up putting a fuse on the B+ as well. esp since I still have the orig filter caps (they check like new for leakage and capacity so I just can bring myself to restuff them) I did not check EVERY section of the two caps so if the B+ show excessive draw I will do. I know that if the B+ is low that would explain my width issues so that is the main reason I am checking. Overall the B+ is not that far off so I dont think I will find anything major here. I did run a fan on the fly and after 1 hour it was barely warm so I will def be looking into how to set that up on a perm basis. It was pretty noisey so I will be looking for a smaller quieter fan. I want to make the fan install a no mod to the HV cage. I am thinking of making a plenum that will adapt to a partially open cage top. it will take a bit but I really like keeping that fly cool. |
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