HP 8340B Manual page 360

1.
Disconnect W13 from the A18 assembly
(Figure H-23,
view
C).
2.
Disconnect W14 and W26 from the A12
assembly
(Figure
H-23, view
B).
3.
Using
a
small pozidriv,
remove the two screws that
hold the A12 assembly (item 13).
4.
With W13 attached, remove the A12 assembly.
5.
Referring to the front panel
—
rear panel
functional group,
remove
the front panel. You don't need
to remove the ribbon cables.
6.
Remove the two screws (item 6) that hold the A10/A12 assembly mounting bracket.
7.
Remove the
high band
detector assembly
(AH)
from A10J2.
8.
Remove
the W16 cable from the A13
SYTM
assembly.
9.
Carefully remove the other end of W16 from the precision 3.5 mm A10J1
connector.
10.
Carefully remove the cable from the A10J3 connector (near the front panel). Avoid
axial
force on
the
cable.
11.
Pull the
A10/A13 mounting bracket out far enough
to access the screws that
hold the A10 assem¬
bly
in place, and remove the screws.
12.
To install
a
new A10 assembly, reverse the above procedure. With the front panel removed, the
cable going to A10J3
is accessible through the front
of
the
Instrument.
A12 Low Band
Detector
Refer to Figure
H-12 for related assemblies, cables, and mounting hardware locations.
1.
Disconnect W13 from the A18 assembly (Figure H-23, view C).
2.
Disconnect W14
and
W26 from the A12 assembly (Figure H-23, view
B).
3.
Using a small pozidriv, remove
the
two screws
that hold the A12 assembly (item
13).
4.
With W13 attached, remove the A12 assembly.
5.
Disconnect W13 and unsolder
the
three wires attached to
the A12 assembly.
6.
To install
a new
A12 assembly, reverse the above procedure.
A13 High Band SYTM Replacement Procedure
Refer to Figure H-23 and Figure H-24 for related assemblies,
cables, and mounting hardware
loca¬
tions.
1.
Using the hinged
RF deck
access procedure that follows these disassembly procedures, open the
hinged RF deck assembly.
NOTE:
When you remove the ribbon
cable
from
A13A1
(below), note its
proper orientation.
If
you put
this cable on backwards, all the power supplies shut down.
H-40
RF
Section Repair Procedures
HP 8340B/41B