Rear Terminal Assembly Removal; Optional Plug-In Assembly Removal - HP 3457A Service Manual

Replaceable Parts
6-1 5. DlSASSEMBLY/ASSEMBLY PROCEDURES
6-16. The following procedures explain how t o remove and replace certain cabinet parts and printed circuit
assemblies.
T o avoid personal injury, bc cer/ain /ha/ the linc power and all cxternal inputs are
disconncctcd from the H P 3457A hc fore
proceeding
with any disasscmhly
procedrlre~.
T o prcvcnl darnagc to the H P 3457A, obscrvc stalic handling and clean handling
techniqocs when disnr.rrmbling.
6-1 7. Rear Terminal Assembly Removal
6-18. N o prior disassembly of the instrument is required t o remove the Rear Terminal Assembly. Remove
the Rear Terminal Assenibly as follows:
a. Remove the power cord and all external input connections from the HP 3457A.
b. Remove the t w o screws attaching the Terminal Assembly t o the rear panel.
c. Remove the Terminal Assembly from the rear panel and disconnect the attached connector.
d. Replace the Terminal Assembly by reversing the order of steps a through c.
6-1 9. Optional Plug-In Assembly Removal
6-20.
N o prior disassembly of the instrunlent is required t o remove the Optional Plug-In Assemblies. Remove
the Optional Plug-In Assemblies as follows:
a. Remove the power cord and all external input connections from the HP 3457A.
b. Remove the t w o screws attaching the Terminal Block Assenibly t o the rear panel.
c.
Remove the Terminal Block Assembly.
d. Lift the t w o white locking levers t o release the locking mechanism.
e. Use the holes provided in the corners of the Plug-ln Assembly shield t o pull the assembly free of
the instrument.
f. Squeeze the locking tabs of the attached connector together and disconnect the connector.
g. T o replace the Plug-In Assembly, reverse the order of steps a through f.