HP 8340B Manual page 363

A17 Low Band
Mixer Replacement Procedure
Refer to Figure H-23 for related assemblies, cables, and mounting hardware locations.
1.
Remove the four screws
on the A17 assembly (one on each corner).
2.
Disconnect the three cables that go to the
A17 low
band mixer, and remove the
assembly.
3.
Install
a new
assembly by reversing the above procedure.
A18/A18A1 Low Band
Power Amplifier Replacement Procedure
Refer to Figures H-23
and
H-24 for related assemblies, cables, and mounting hardware locations
1.
Remove the two screws
(item
12) that
hold this assembly in
place.
2.
Remove
the cables that go to the A18 assembly.
3.
Take
the assembly out of the instrument and remove the
two countersunk screws that hold the
A18 mounting plate to the
assembly.
4.
Attach the mounting plate to the new A18 assembly and install the assembly by reversing the
above
procedure.
A20
RF
Section Filter Replacement Procedure
Refer to
Figure
H-23 for
related assemblies, cables, and mounting hardware locations.
1.
Remove
all
connectors from the assembly.
2.
Remove
the ribbon cable that goes to the A16A1 and
A20 assemblies.
3.
Remove the four screws
holding
the assembly (one in each corner).
4.
Remove
A8W1 and A18A1W1 and
remove the A20 assembly.
5.
Install
the new assembly by reversing the above procedure.
NOTE: When reconnecting the ribbon
cable
to the
A20
and A16A1 assemblies, ensure that
the pins
do not bend.
A63 RF Attenuator Replacement Procedure
1.
Referring to the front panel
—
rear panel functional group, remove the front
panel. You
don't need
to remove the ribbon cables.
2.
Remove the two cables going
to the
A63 assembly.
3.
Remove
the
two screws
holding the A63
mounting bracket.
4.
Remove
the
two screws
holding the A63 assembly
to the mounting bracket.
5.
Install
a
new assembly
by reversing the above procedure.
HP8340B/41B RF
Section Repair Procedures
H-43/H-44