© Agilent Technologies 1989–2002 Agilent 3070 / 79000 Site Preparation 11-17
Chapter 11: Site Preparation – Series 3 / 79000 Current Reduction Conversion: Series 3 Current Reduction Conversion Procedure
3 Note that each switch has two positions.
Representations of these positions are silkscreened
on the PC board next to the switches. To change the
line voltage, consult the silkscreen drawing and set
the switches accordingly.
4 Check the rating of the fuse (F1) installed in the rear
panel fuse holder and replace with the correct fuse if
necessary. Use
Table 11-5 to determine the proper
fuse.
WARNING
✸
Make sure the replacement fuse type (size) and
rating (current, speed, and voltage) is consistent
with the voltage level you are operating at. Using
a substitute fuse could result in a fire hazard.
6634B Line Voltage Settings
The 6634B supply is set at the factory for 120 volt line
power. The 6634B supply can be set to accept 100, 120,
220 or 240 volts ac input by setting the jumpers on the
power transformer as shown in
Figure 11-6 on
page 11-18.
1 Turn off power to the supply and disconnect the
power cord from the power source.
2 Remove the four screws that secure the two carrying
straps and outer cover.
3 Slightly spread the bottom rear of the cover and pull
it back to disengage it from the unit.
4 Locate the ac input wiring harness on the left side of
the transformer.
5 Use needle nose pliers and connect the ac input
wiring harness according to the information in
Figure 11-6 on page 11-18.
Table 11-5 6634A fuse requirements
Line Voltage Fuse Needed Part Number
100 / 120 V 4 AF/250V 2110-0055
220 / 240 V 2 AF/250V 2110-0002
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