jonschultz's latest activity
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Jjonschultz replied to the thread Colour Classic Display Issues After 84v Mod + Recap.That's a good sign because it means the AC section and the CRT supply section are working. The logic board supply side could still have...
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Jjonschultz replied to the thread Colour Classic Display Issues After 84v Mod + Recap.Are you now getting no voltage on RV26 and RF19?
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Jjonschultz replied to the thread Colour Classic Display Issues After 84v Mod + Recap.When a CC seems to be this dead, I recommend checking some of the low-voltage supplies. Many of them will normally be running even...
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JOver the years, there have been lots of discussions surrounding the infamous DL21 and DL22 18V Zener diodes on the Color Classic analog...
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Jjonschultz replied to the thread Mystic Color Classic Screen Distortion.Well CP35 appears to be in the power supply section. I'm less familiar with this territory of the analog board, but I think CP35 might...
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Jjonschultz replied to the thread Mystic Color Classic Screen Distortion.Yeah, the bulging is bad and a fairly typical problem on Color Classic analog boards, precisely because of the heat generated by those...
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Jjonschultz replied to the thread Colour Classic Display Issues After 84v Mod + Recap.Yeah I agree, the DF2 voltage is suspiciously high. Do you have the correct value for RF11, which biases DF2? I think it should be 370 Ohms.
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Jjonschultz replied to the thread Colour Classic Display Issues After 84v Mod + Recap.Excellent suggestions regarding the voltages to check. I was also going to mention that checking a flyback-generated voltage would be a...
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Jjonschultz replied to the thread Mystic Color Classic Screen Distortion.I measure about 22.7V across CF10 on my system. Like a lot of components on the CC analog board, it's not very easy to probe from the...
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Jjonschultz replied to the thread Mystic Color Classic Screen Distortion.It's the 220uF 35V electrolytic, just south of the two large, blue, rectangular film capacitors near the top center of the image. Also...
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JI thought I would share some of my progress on getting VGA output on a Color Classic using my XC1186B reverse-engineered replacement...
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Jjonschultz replied to the thread 84V Mod on Color Classic - Thick light gray bars.This might simply be from the horizontal deflection (refresh) now running at 67Hz instead of 60Hz, and there just happens to me more...
