a) Check battery water and charge the battery with mains
minimum for 8-12 hours. If still less backup, get the
batterycheckedupfromauthorised service personnel.
a)
Check the battery connections and the mains
connections.
b)
Internal problem. Bypass the UPS as explained in
nextsection andcall authorised servicepersonnel.
c)
AC Glass fuse blown. Check the fuse at the rear and
replace ifblown.