Pole 
  Voltage (Vdc) 
   + 
  +2.8  to  +3.2 
   - 
  Ground 
If the voltage is not correct, replace the backup battery.
If the voltage is correct, a short circuit or a failure in the
system board has occurred.  Replace the system board.
Please see the LEGAL  -  Trademark notice.
Feel free - send a 
  for any BUG on this page found - Thank you.