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To change the RF section’s fuse
Thefuseisinstalledatthefactorytomatchthemostcommonlyusedline
voltage in the country of destination.
1 Unplug the power cord from the RF section (the section with “Agilent 89431A”
silk screened on its lower left rear panel).
2 Using a small screw driver, pry open the power selector cover.
3 Pull the white fuse holder out of the power selector and remove the fuse from
the fuse holder.
4 Select the proper fuse and place in the fuse holder.
AC Line Voltage
Selector
Switch
Fuse
RF Section Range Frequency
Agilent Part
Number
Type
Agilent 89431A 90-110 Vrms 47-63 Hz 100 2110-0381 3 A 250 V Slow Blow
Agilent 89431A 103-140 Vrms 47-63 Hz 120 2110-0381 3 A 250 V Slow Blow
Agilent 89431A 198-242 Vrms 47-63 Hz 220 2110-0304 1.5 A 250 V Slow Blow
Agilent 89431A 216-264 Vrms 47-63 Hz 240 2110-0304 1.5 A 250 V Slow Blow
1 Align the white arrow on top of the fuse holder with the white arrow on the
power selector cover. All three arrows should point in the same direction.
Push the fuse holder into the top slot of the power selector.
2 Close the power selector by pushing firmly on the power selector cover.
3 Check that the correct line voltage appears through the power selector cover.
Preparing the Analyzer for Use
7-13