HT instruments HT401 - Manual (Page 19)

HT401
EN - 18
5. MAINTENANCE
CAUTION
 Only expert and trained technicians should perform maintenance
operations. Before carrying out this operations, make sure you have
disconnected all cables from the input terminals
 Do not use the instrument in environments with high humidity levels or
high temperatures. Do not expose to direct sunlight
 Always switch off the instrument after use. In case the instrument is not to
be used for a long time, remove the battery to avoid liquid leaks that could
damage the instrument’s internal circuits
5.1. BATTERY AND FUSES REPLACEMENT
When the LCD displays the flashing symbol “ ”, it is necessary to replace the battery.
Fig. 11: Replacement of the battery and internal fuses
Replacing battery
1. Position the rotary switch to OFF and remove the cables from the input terminals.
2. Remove the protection shell from the instrument
3. Loosen the screw of the rear battery compartment cover, remove the cover and extract
the battery (see Fig. 11)
4. Insert a new battery of the same type (see § 6.1.3) respecting the indicated polarity,
close the compartment and reinsert the protection shell
Replace fuses
1. Position the rotary switch to OFF and remove the cables from the input terminals
2. Remove the protection shell from the instrument
3. Loosen the screw of the rear battery compartment cover and the four fastening screws
of the rear semi-shell
4. Remove the damaged fuse and insert a new fuse of the same type (see § 6.1.3).
Close the semi-shell and reinsert the protection shell
5.2. CLEANING THE INSTRUMENT
Use a soft and dry cloth to clean the instrument. Never use wet cloths, solvents, water, etc.
5.3. END OF LIFE
CAUTION: the symbol on the instrument indicates that the appliance and its
accessories must be collected separately and correctly disposed of.