HP 3457A Service Manual page 143

3457A Replaceable Parts
c. Remove the seven screws which hold the A2 Assembly to the bottom shield. (It is not necessary to
remove the screws from the Reference Assembly.)
d. Slide the Analog Assembly toward the rear of the instrument to clear the fuse holder from the
front panel and remove the assembly.
e. To replace the Analog Assembly, reverse steps a through d.
6-33. Front Panel Removal
6-34. It is necessary to remove the Rear Terminal Assembly or Plug-In Assembly, Top Cover, Plug-In
Support Assembly, AC Convertor (A3) Assembly and Analog (A2) Assembly prior to removing the Front
Panel Assembly, Remove the Front Panel Assembly as follows:
6-6
a. Remove the Rear Terminal Assembly (paragraph 6-17) or Plug-In Assembly (paragraph 6-19), Top
Cover (paragraph 6-21), Plug-In Support Assembly (paragraph 6-27), AC Convertor (A3) Assembly
(paragraph 6-29) and Analog (A2) Assembly (paragraph 6-31).
b. Disconnect connector P501 from the Digital Assembly.
c, Remove the screw attaching the Front Panel to the bottom shield of the Digital Assembly.
d. Lift the Front Panel clear of the bottom cover.
e. To replace the Front Panel Assembly, reverse the order of steps a through d.