ian QAD-90011 Manual De Usuario página 12

BATTERY AND FUSE REPLACEMENT
The fuses usually don't need replacement and will only
blow up as a result of an operation error. If " " indicator
appears on the display, it means that the battery should
be replaced. To replace battery & Fuse (500mA/250V)
remove the 2 screws in the bottom of the case, then
remove the old battery or Fuse and replace with new
ones. Be careful to observe polarity.
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