Instructions For Replacing Or Retrofitting Hp 8114A Subassemblies - HP 8114A Service Manual

HP 8114A Service Guide

Instructions for Replacing or Retrofitting HP 8114A Subassemblies

Caution
44 Disassembly and Reassembly
Disconnect the instrument from the mains power before disassembly!
The following sections show you how to remove and refit
subassemblies. Generally, refitting is the reverse of removal, but
where this differs, notes are included for guidance. Retrofitting
the steps in reverse, in the same way as refitting.
As a general rule, do not tighten PC board fixing screws until all the
screws have been inserted and partially tightened. This helps to avoid
flexing the board by securing it unevenly.
Diagrams show where the fixing screws are located, but depending on
the options fitted to the instrument you are working on, the diagrams
may not be identical. For example, some HP 8114A versions have
the BNC connectors on the rear panel, while others have the BNC
connectors on the front panel. Both positions have been shown in the
diagrams.
Note the position of all cables
reassembly can cause damage to the cables. Also, noise levels can be
degraded by wrong positioning.
when
you remove boards, as incorrect
uses