Quote:
Originally Posted by Penthode
It does not appear to be a horizontal drive line. The line is most likely due to insufficient horizontal retrace blanking. During horizontal retrace there may be a positive overshoot of the rear of the sync pulse.
If it was a drive line, horizontal scan linearity would be affected with evidence of picture foldover across the line. I see no evidence of this in your photos.
To confirm, adjust the horizontal sync phase by adjusting the horizontal hold control. If the line moves, it is due to a blanking problem. If it stays fixed, it is a drive line.
You should be able to minimize it by adjusting the fine tuning. But there are means to improve retrace blanking if that is the problem which I believe it is.
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I haven't had a chance to open it up and make adjustments per the service manual yet, but I can confirm that the line moves left or right in accordance with the user control of the horizontal hold.
06-11-2018, 01:11 AM
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