HP 54600B User's And Service Manual page 141

Service
Replacing Parts in the Oscilloscope
Figure 4–8
Removing the front panel
4–52
When installing the front panel, make sure that the power switch shaft is
aligned with its mating hole in the front panel.
The front panel swings in to engage the two retainer tabs. Before attempting to
engage the retainer tabs, make sure that the six hooks on top of the front panel
are fully engaged with their mating holes in the sheet metal.
Tab A
Tab B