I have a bad noise in my Sega New Net City, it sounds like a old crappy fan so I thought of replacing the fan in the PSU (power supply unit). When removing everything I took pictures, it’s always good to take some pictures so I know what I have done, specially if I have to abort because of kids fighting or some other natural disaster.
PSU is attached to a “shelf” and can’t be removed since I can’t reach the screws without removing the whole shelf. I will try and explain how I removed the shelf that both power supply and sound amplifier are attached to.
I started with detaching all cables that connects to the power supply and sound amplifier, it’s mainly different AMP connectors and I just took it slow… no problems at all. After all cables are unattached so I can move the shelf from the cabinet I unscrew screws according to my pictures below, 2 in front (open front hatch) and 2 inside the cabinet.
Remove left and right top screws in front, 2 in total.
Remove left and right screws in top, 2 in total.
With screws removed I just took the shelf and lifted it out to my desk. To remove PSU from the shelf I removed the 4 screws in the PSU bottom frame. I’m used to heavy and solid ATX power supplies so I were quite surprised how light this PSU were. After removing PSU from shelf I removed the top cover, a total of 5 screws.
Everything outside cab
PSU top cover removed, dirty…
Don’t loose any screws!
NNC PSU information. It runs on 100V and gets power from a AMP connector.
To remove the fan just unscrew the 4 screws on the fan, unplug the 2-pin cable from PSU PCB and lightly remove it.
80x80x25mm PSU fan, CHA8012BS, 12V
Yes, it’s 80x80mm and has a height that’s 25mm
More screws, don’t loose them!
The fan is 80x80x25mm so it will be easy to replace. Will order a new fan this week and will then continue Part 2 with the replacement and cleaning!
Bonus pictures. 🙂
Back of PSU PCB