Matco Tools MD79 Manual Del Usuario página 16

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In other words, the meter will intelligently avoid entering the APO
mode when it is under normal measurements. To wake up the meter
from APO, press the SELECT button momentarily and release, or turn
the rotary switch OFF and then back on. Always turn the rotary switch
to the OFF position when the meter is not in use
5) MAINTENANCE
WARNING
To avoid electrical shock, disconnect the meter from any circuit,
remove the test leads from the input jacks and turn OFF the meter
before opening the case. Do not operate with open case.
Trouble Shooting
If the instrument fails to operate, check batteries and test leads etc.,
and replace as necessary. Double check operating procedure as
described in this user's manual.
If the instrument voltage-resistance input terminal has subjected to high
voltage transient (caused by lightning or switching surge to the system
under test) by accident or abnormal conditions of operation, the
protective impedance components in series might be blown off
(become high impedance) like open fuses to protect the user and the
instrument. Most measuring functions through this terminal might then
be open circuit. Such components should only be replaced by qualified
technician.
Cleaning and Storage
Periodically wipe the case with a damp cloth and mild detergent; do not
use abrasives or solvents. If the meter is not to be used for periods of
longer than 60 days, remove the batteries and store them separately.
Battery replacement
The meter uses standard 1.5V AAA Size (IEC R03) battery X 2
Loosen the 2 captive screws from the battery cover case. Lift the
battery cover case. Replace the batteries. Replace battery cover case.
Re-fasten the screws.