Mark_W's latest activity

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Mark_W replied to the thread 84V Mod on Color Classic - Thick light gray bars.

Agree with what @jonschultz said before regarding B2 voltage. Also first thing you need to do before adjusting geometry is to adjust the...

Aug 17, 2026
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Mark_W replied to the thread Performa 575 Whining/Squealing noise, analog board.

Have you reflowed all solder joints yet? That will rule out connection issues. if so then I guess you have the same bad transformer as I...

Aug 8, 2026
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Mark_W replied to the thread Performa 575 Whining/Squealing noise, analog board.

Ah yes I had the same issue on my LC520 (shares the same chassis as LC550/575 other than the caddy CD drive). Got the machine in...

Aug 7, 2026
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Mark_W replied to the thread CRT width.

I assume you are repairing the analog board of se30 right? Check -12v output of psu and on logic board. if there's no -12V you won't get...

Aug 2, 2026
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Mark_W replied to the thread CRT width.

Horizontal width is controlled by the width coil, not potentiometer. I assume you are talking about the vertical height of the image...

Jul 30, 2026
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Mark_W replied to the thread Classic II (early 4-ROM) black screen - RESET held low, no 15.7 MHz clock from EAGLE.

If you've already checked voltage and clock signal on Egret, then it could be a dead EGRET chip. iirc on classic ii Egret chip is...

Jul 20, 2026

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