Sanyo 20ez low b+ not adjustable

Pitas_arcade

Well-known member
Joined
Jul 9, 2020
Messages
599
Reaction score
347
Location
Claremont, California
I have a 20ez in my Mario bros that has been working for years but one day it started to pulse and wave. I thought it was the B+ cap so I changed so and it solved the pulsing issue but the image is smaller than it should be and the b+ is low at 80v and it's not adjustable. So I replaced the B+ pot and flyback and that did not make a change. Is the voltage regulator bad??
 
Last edited:
low B+ is common to the filter cap, B+ pot and the LA5112n regulator and rarely affected by the flyback so i wouldn't have replaced that. you case if a part is bad and its not a cold solder joint/cracked trace then i bet the la5112 is bad. we stock all the parts.

 
Update I replaced the LA5112n and it made no change. The b+ pot does nothing. And the voltage fluctuates from 81V to 77V
I'd just refresh everything, cap kit, new pots, etc.(PS also)
likely will save more time doing it all at once rather then disassemble repair, reassemble, still not working, repeat…just to save you the heartache imo
 
Back
Top Bottom