Sega SC-3000 video daughterboard.
Posted: Sat Feb 16, 2013 10:29 pm
Hi all, am new here, nice to find this place! Am repairing a Sega SC-3000, (blank video output, using composite from video out 5-pin DIN socket), and think I have a faulty video daughterboard. There's no significant voltage present on the supply pins of the 3 x ICs on there. From what I can tell, there's a +9V feed from main board (red wire) - then some sort of DC-DC transformer using T101 and a few inductors, transistors, and diodes. I think that's where my problem is.
Has anyone worked on these before? I'd love to find a circuit diagram that covers that daughterboard, but can't locate one. Alternatively, anyone know what voltages I should see on the pins of the T101 transformer?
Machine is the Aus/NZ model.
Thanks in advance, any advice/questions/whatever much appreciated!
Has anyone worked on these before? I'd love to find a circuit diagram that covers that daughterboard, but can't locate one. Alternatively, anyone know what voltages I should see on the pins of the T101 transformer?
Machine is the Aus/NZ model.
Thanks in advance, any advice/questions/whatever much appreciated!