HP 8340b User Manual

2.
Remove
W8
from
AT1J2.
3.
Using
a
small,
flat
tool,
gently
pry
up
the ribbon
connector
(W33)
from
A13A1J1.
Note
the
original
orientation.
Do
not
pull
the
ribbon
cable
off by
hand;
this
can
badly
bend the
pins.
4.
Disconnect
W8
from
A13J1, and
remove
it
from
the
instrument.
Do
not
bend the small
terminals
on
the
A13A1
assembly
with the
wrench.
5.
Completely
remove W14,
which
connects
A13J2
to
A12J2.
6.
Holding the
A13
assembly, remove
the
two
screws
(item
8)
shown
in
Figure
H-24.
7.
When replacing
the
A13
assembly,
apply
a
thin,
continuous layer
of
thermal
compound
(HP
Part
Number 6040-0454,
CDO)
to
each
side of the
A13MP1
aluminum
spacer
between
the
SYTM
and
the
RF
deck.
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CAUTION
i
SWM^M^M^
Do
not
use
silicone based thermal
compound.
Silicone
based
oil
migrates
past
element
sockets,
switch
contacts,
or
printed
circuit board
edge connectors,
raising
contact
resistance,
or
electrically
isolating the
contacts.
Silicone
based thermal
compounds
disperse
into
the
air,
depositing
themselves
anywhere
in
the
instrument.
Heat
increases
the
rate
of
dispersion.
ATI
Replacement
Procedure
Refer to Figure
H-23,
view
D
for related
assemblies,
cables,
and
mounting hardware
locations.
1.
Remove
W7
and
W8
from
the
AT1
assembly.
2.
Remove three
of
the
the
four
screws
shown
in
Figure
H-23,
view
D.
3.
When
removing
the fourth
screw,
hold
the
AT1
assembly.
4.
Ensure
that
W7
and
W8
are
clear
of
AT1J1
and
AT1J2
when
you
remove
the
AT1
assembly.
5.
To
install
a
new
assembly,
reverse
the
above
procedure.
AT3
Replacement
Procedure
Refer to Figure
H-23,
view
C
for related
assemblies,
cables,
and
mounting
hardware
locations.
1. Remove
the
four
screws
on
the
A17
assembly
(one
on
each
corner).
2.
Disconnect
W52
from
the
A15
assembly.
3.
Disconnect
W6
from
the
A14A1
and
A16A1
assemblies,
and
remove
it
from
the
instrument.
4.
Disconnect
W5
and
W12
from
the
A17
low
band
power
amplifier, and
remove
the
A17/AT3
assem¬
blies.
5.
Disconnect
W53
from
the
amplifier,
separating
the
A17
and
AT3
assemblies.
HP
8340B/41B
RF
Section
Repair Procedures H-41

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English