HP 8340B Manual page 357

HINGED RF DECK ACCESS PROCEDURE
You must perform the following procedure to replace the following assemblies:
•
A13 high band SYTM
•
A16
Mod Splitter
•
A18 low band
power
amplifier
•
AT1 high
band peripheral mode isolator
Refer to Figure H-24 assemblies, cables, and mounting hardware locations.
1.
Remove the instrument top, bottom, and perforated side covers.
2.
Place the instrument on its
left side (as viewed from
the
front).
y^^^^,»
^CAUTIONj
A10J1, A10J2, and A10J3
are
precision 3.5 mm connectors.
The cables
and the
high
band detector assembly that connect to them use
SMA
connectors.
Take extreme care
when disconnecting or connecting an
SMA
cable and
a
precision 3.5 mm connector. The SMA
cable center
conductor must align with the 3.5 mm connector
center conductor. Any
axial force
on
the cable when you disconnect the SMA fitting can
damage the
3.5 mm
connector center conductor, and the
A10
directional
coupler
will
have
to be replaced. Remove the axial force on the cable by
first disconnecting the end of the cable that
does
not
mate with the 3.5
mm connector, or by removing the A10 assembly mounting screws. Do
both where possible. The
A11J1
connector has
a
captured nut that
does
not allow axial force
on
the precision 3.5 mm center conductor
until
well
after the SMA center conductor
is
disengaged.
Instrument Bottom
3.
Remove W14 from the A12 assembly.
4.
Disconnect W16 from the A13 high
band SYTM.
5.
Carefully disconnect the other side
of W16 from the A10 assembly and completely remove W16
from the instrument. Avoid axial force on the
W16 to A10J1
connection.
6.
Remove the three
side panel screws
(item
4) that
hold the A13
assembly to the side
rail.
7.
Remove the two side panel screws
(item
5) that
hold the RF deck to the side
rail.
Instrument Top
8.
Remove W3
and
W4
from the A16 assembly.
9.
Remove the two screws (item 7) from
the RF deck (view C).
10.
Remove the screw (item 3) holding
the A8 casting to the A62 motherboard.
HP 8340B/41B
RF Section Repair Procedures
H-37