What's new

Astro City PSU wiring

Crunch

Student
Joined
May 14, 2018
Messages
93
Reaction score
72
Location
Canada
I've got an New Astro City with a generic PSU wired into the stock 400-5198-01Y PSU. It's worked fine enough for years, but enough small glitches occurring that it's time to go with just the stock Sega PSU. Have another recapped 400-5261 that's ready to drop in.

PXL_20250425_2239513925.JPG



I'm wondering if anyone knows where the 2nd (middle) set of the OTN and OTL wires is supposed to go from the circled connector in the pic? The top set goes to the marquee light and the bottom set goes to the monitor but currently the 2nd set of mine goes into this secondary PSU.

The wiring schematic isn't exactly clear where it goes:

Screenshot 2025-05-25 171841.png



These are the 2 locations where they're coming from. If anyone has stock wiring in there and could check would be much appreciated.


Sega_400-5198-01Y_pinout.jpg
 
Comparing the regular Astro City (400-5198) to the NAC manual, it looks like those two outputs are not even wired in the Astro. Since it's not needed to power any other AC parts in the NAC I'll assume it's safe to just terminate those two wires along with the others that were spliced out and it should be ready to drop in the new PSU.
 
The 400-5198-01Y is interchangeable with the 400-5261? And all the other variants with that same pinout? (400-5198CE-01Z, 400-5198-01X, 400-5261Y as long as they dont have the bundled amp) No hidden gotchas with swapping these?
 
I'm wondering if anyone knows where the 2nd (middle) set of the OTN and OTL wires is supposed to go from the circled connector in the pic?
It goes to power the optional stereo amp that is installed under the PSU. Mine is a 400-5198-01 PSU and it’s installed like this:
IMG_9276.jpeg
 
Confirmed that the 400-5261Z is a compatible swap for the 400-5198-01Y, so I assume those other models listed would also work. It also fixed the monitor interference (visual horizontal waves) problem I was having and the 12v issue of juggling 2 PSUs. Changing the transistor at IC3 with a 78L05 also brought back -5v. Terminated those loose wires and good, thanks @opt2not and @NFGx
 
  • Like
Reactions: nem
Back
Top