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Old 19th Jul 2019, 7:33 am   #7
Argus25
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Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
Default Re: Commodore 1084-D2 Monitor Repair

Quote:
Originally Posted by cmjones01 View Post
Without seeing the fault close-up, that looks to me like there's something amiss in the black level clamping/colour burst department, so I'd start looking for oddities around the line timebase.

Chris
I don't think so.

Black level clamping and anything to do with the color Burst gating act at horizontal or line rate and you would see vertical disturbances/lines, not horizontal ones.

This fault acts at a frequency not too far above the vertical rate, much slower, and it's about 250Hz, nowhere near the line rate, which is why the lines are horizontal. As I mentioned, this rate would be an unusual frequency to find as a signal inside a monitor, but could easily appear out the output of a DVD or VCR etc, like the signals you can see when you fast forward or shuttle a DVDs or vcr tape.
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