Maintenance
126 Agilent 55B AA Spectrometer User’s Guide
Fuses
The spectrometer contains two operator accessible fuses located at the back of
the instrument. To replace a fuse, you must disconnect the instrument from the
power supply and replace the blown fuse with the type and rating indicated in the
Specifications section – Page 34.
The fuses have a code marked on the cap (e.g. T 4A H250V). This refers to the
fuse characteristic (‘T’= time lag, ‘F’= fast acting), the current rating (in amperes),
the breaking capacity (‘H’= heavy, ‘L’= low) and the voltage rating (in volts). This
code must correspond to the code appearing next to the fuse-holders.
WARNING
Shock Hazard, Fire Hazard, Hot Surface.
To prevent reduced safety protection or unwanted fusing, ALWAYS ensure
that the code on the fuse cap matches the printed information shown
adjacent to the fuse-holders.
To check a fuse:
1 Disconnect the instrument from the mains power supply.
2 Remove the fuse holder, located to the right of the mains input connection as
shown in Figure 89 below.
3 Place the tip of a flat head screw driver into the slot (1).
Figure 89. Fuse cover
1. Removal slot 2. Fuse holder
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