Getting Service - HP 54645A User's And Service Manual

Getting Service

If the oscilloscope is under warranty, you must return it to
Hewlett-Packard for all service work covered by the warranty.
See "To return the oscilloscope to Hewlett-Packard."
If the warranty period has expired, you can still return the
oscilloscope to Hewlett-Packard for all service work. Contact your
nearest Hewlett-Packard Sales Office for additional details on service
work.
If the warranty period has expired and you decide to service the
oscilloscope yourself, the instructions in this chapter can help you
keep the oscilloscope operating at optimum performance.
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