Every time you shut the power, your Dreamcast lose its time and date settings?
Perhaps your Cmos battery died in your Dreamcast.
Tools you will need:
Wire cutters and wire strippers
CR2025 battery cell holder (or other battery holder depending on your batteries)
CR2025 coin cell battery (or other type of 3v battery)
Doubled Side foam mounting tape
Optional: Electric tape and/or Electric shrink wrap
Step 1: Disasembling Your Dreamcast
1. Flip your Dreamcast upside down.
2. Remove the modem from your Dreamcast
3. Remove the 4 Screws holding your Dreamcast shut.
4. Flip back over and remove the top of the system's case.
Step 2: Removing the Circuit Board
5a. (optional) If you have a multimeter or other volt tester you can test the battery to see if it is dead or not.
6. Locate 4 brass screws on this circuit board, it should be near the controller ports, remove them.
7. Then carefully remove the ribbon cable by pulling upwards .
8. Carefully remove the 3 pin connector going to the Fan to the Right
Step 3: Replacing the Battery
10. solder in 2 wires for the new battery, keep in mind which spots on the board the plus and minus terminals went.
10a. if required solder the wires to the appropriate terminals to the battery holder
Now the hard part is done
11. replace back in the circuit board back into the Dreamcast
12. Reattach the ribbon cable and fan connector
13. attach the battery holder to the inside using a self adhesive, like double-sided foam mounting tape, self adhesive velcro would work here too.
14. Replace the top cover of the Dreamcast and replace the 4 case screws
15. Put back the modem
16. Hook up your Dreamcast to your TV or Monitor and reset the time