Install the correct line fuse, Close the unit – HP 6633B User Manual
Page 70
D - Line Voltage Conversion
70
Install the Correct Line Fuse
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Unscrew the line fuse cap from the rear panel and install the correct fuse.
For 100/120 Vac operation: 4 A; HP part number 2110-0055
For 220/230 Vac operation: 2 A; HP part number 2110-0002
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Mark the voltage setting that the unit has been set to on the rear panel label.
Close the Unit
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Replace the outer cover.
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Reconnect the power cord and turn on the unit.