First of all check backup battery ( under VS8-F cards ) Might be "dead".....
If battery is OK then maybe some capacitors "gone south" and causing malfunction.
2480 HD is a 3,5" and 1680 HD is a 2,5" , so not switchable .....
Donīt know about VS-2000 .... I think it has a different OS, so might
be some issues decoding VS-2480 projects ..... But Iīm not sure
Hopefully someone who knows will chime in
Cheers !