HP 54616B User And Service Manual page 122

Service
Adjusting the Oscilloscope
Adjust HB Cont (half bright contrast) for the best contrast between
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the half bright and full bright blocks.
You can readjust Sub Bri, intensity control, and HB Cont to suit your
individual preference.
Press any key to continue to the next test pattern. Then, adjust
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H.Hold (horizontal hold) to center the display horizontally.
Adjust Focus for the best focus.
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Press any key to continue to the normal display pattern. Then adjust
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V.Lin (vertical linearity) for equal sizing of all four corner squares.
Adjust V.Size (vertical size) to center the display vertically at the
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maximum allowable size without losing the text.
Adjustments V.Lin and V.Size interact so you may need to readjust sizing and
vertical centering of the display.
Figure 4-4
Display board adjustment locations
4–30