Sega Astro CIty Nanao MS8 Pincushion and Horizontal Size Issue

Day_Man

Hardened Shock Trooper
Joined
Jan 20, 2016
Posts
443
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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MKL

Basara's Blade Keeper
Joined
Mar 8, 2002
Posts
3,685
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.
 

shadowkn55

Genbu's Turtle Keeper
Joined
Dec 9, 2006
Posts
2,386
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
 
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