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Thread: Sega Astro CIty Nanao MS8 Pincushion and Horizontal Size Issue

  1. #1
    B. Jenet's Firstmate
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    Sega Astro CIty Nanao MS8 Pincushion and Horizontal Size Issue

    I'm having an issue with monitor in my Astro Cab. There is a pincushion in the geometry and on the adjustment board the pot for horizontal size doesn't work. I had the chassis completely recapped and we tried a different adjustment board. Even with the new adjustment board the pot still doesn't work. Any one had a similar problem or any advice?
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  2. #2
    Basara's Blade Keeper
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    Test out of circuit the damper/compensation diodes. It's a big transistor like package screwed to the heat sink in the middle of the chassis probably screen printed D630.

  3. #3
    Choi's Barber
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    I've replaced several of the heatsink mounted ICs and I don't remember seeing D630. Could it be any of these?

    LA7830
    C4157
    C2688
    C4288

  4. #4
    Basara's Blade Keeper
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    Maybe it's D530, not sure.

    ms8-29.jpg

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