TESTBOY TV 450
Maintenance
60
8 Maintenance
Unauthorized persons are not allowed to open the TESTBOY TV 450 instrument. There
are no user replaceable components inside the instrument, except the battery and fuse
under rear cover.
8.1 Fuse replacement
There is a fuse under back cover of the TESTBOY TV 450 instrument.
F1
M 0.315 A / 250 V, 20
×
5 mm
This fuse protects internal circuitry for continuity functions if test probes are
connected to the mains supply voltage by mistake during measurement.
Warnings:
Disconnect all measuring accessory and switch off the instrument
before opening battery / fuse compartment cover, hazardous voltage
inside!
Replace blown fuse with original type only, otherwise the instrument may be
damaged and/or operator’s safety impaired!
Position of fuse can be seen in
Figure 3.4
in chapter
3.3 Back panel
.
8.2 Cleaning
No special maintenance is required for the housing. To clean the surface of the
instrument use a soft cloth slightly moistened with soapy water or alcohol. Then leave
the instrument to dry totally before use.
Warnings:
Do not use liquids based on petrol or hydrocarbons!
Do not spill cleaning liquid over the instrument!
8.3 Periodic calibration
It is essential that the test instrument is regularly calibrated in order that the technical
specification listed in this manual is guaranteed. We recommend an annual calibration.
Only an authorized technical person can do the calibration. Please contact your dealer
for further information.
8.4 Service
For repairs under warranty, or at any other time, please contact your distributor.
