16-07-2023, 06:37 PM
The last adjustment improved the image curl on the left side, but unfortunately also made it very unstable. In addition, there is still a vertical glitch on the left side.
I went back to the original adjustment, which stabilized and sharpened the image, but again showed its curl on the left side. The nature of the disruption is well illustrated in the photo below.
This problem is not dependent on the video signal, it is very regular and closely related to the horizontal deflection system. Occurs on a raster. I checked the capacitors in the line time base, replaced them just in case with new ones and nothing. The output transformer also seems fine. I think the oscilloscope found the fault. In the picture below you can see two waveforms from the horizontal deflection coil circuit. The first when the coils are connected and the second without them. The oscillogram shows a disturbance at the beginning of the cycle, probably caused by a permanent short circuit in the coils. The resistance of the coils slightly deviates from the nominal values.
I went back to the original adjustment, which stabilized and sharpened the image, but again showed its curl on the left side. The nature of the disruption is well illustrated in the photo below.
This problem is not dependent on the video signal, it is very regular and closely related to the horizontal deflection system. Occurs on a raster. I checked the capacitors in the line time base, replaced them just in case with new ones and nothing. The output transformer also seems fine. I think the oscilloscope found the fault. In the picture below you can see two waveforms from the horizontal deflection coil circuit. The first when the coils are connected and the second without them. The oscillogram shows a disturbance at the beginning of the cycle, probably caused by a permanent short circuit in the coils. The resistance of the coils slightly deviates from the nominal values.
