I am working on a k4600 monitor I believe a 19k4676 tag is gone but the boards match to this schematic.
I am using the genie pattern generator on cross hatch and I have a horizontal issue I am trying to solve. when I turn up the raster to see the scan lines I notice that the start location for the horizontal scan lines are not in the same place for each line it forms a shape of a half sine wave very small but disturbs the vertical dot alignment.
here are a couple of pics with the raster tuned up. using a cross hatch pattern.
http://www.zapdbf.com/wave1.jpg
http://www.zapdbf.com/wave2.jpg
picture is steady and not moving. this was after horz and vert adjustments so they could be way off. but I scoped out the h sync signal and it is present after the sync amp. but the waveform just before the horizontal oscillator is present but incorrect the timing is correct but the pattern it's self has a capacitor discharge curve look to part of the wave form and this is missing, I checked all caps pertaining to this circuit and they are testing ok. The waveform is also not very steady at that test point. the horizontal amp transistor checked good with no leakage.
fyi, all the electrolytic caps were changed by somebody else, I rechecked the caps using the part list and checked polarity and all are fine.
anybody got any ideas?
I am using the genie pattern generator on cross hatch and I have a horizontal issue I am trying to solve. when I turn up the raster to see the scan lines I notice that the start location for the horizontal scan lines are not in the same place for each line it forms a shape of a half sine wave very small but disturbs the vertical dot alignment.
here are a couple of pics with the raster tuned up. using a cross hatch pattern.
http://www.zapdbf.com/wave1.jpg
http://www.zapdbf.com/wave2.jpg
picture is steady and not moving. this was after horz and vert adjustments so they could be way off. but I scoped out the h sync signal and it is present after the sync amp. but the waveform just before the horizontal oscillator is present but incorrect the timing is correct but the pattern it's self has a capacitor discharge curve look to part of the wave form and this is missing, I checked all caps pertaining to this circuit and they are testing ok. The waveform is also not very steady at that test point. the horizontal amp transistor checked good with no leakage.
fyi, all the electrolytic caps were changed by somebody else, I rechecked the caps using the part list and checked polarity and all are fine.
anybody got any ideas?
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