Varian PTB Turbo V 700 HT 969 9445 Notice D'emploi page 244

17 Technical Information
Fuse holder and voltage changer assembly
Figure 7
To change the power supply voltage rating after having removed the
assembly as explained above, extract the voltage changer and then
reposition it to view the desired voltage rating.
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Voltage changer
Turbo-V 700HT Controller User Manual / 87-900-877-01 (F)