HP 8340B Manual page 145

TOP OF INSTRUMENT
5.
Refer
to
VIEW
C.
Remove W3
and
W4 from the A16
assembly. Loosen the other end of
W3
so the
cable can swing
away
from the
A16
assembly.
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CAUTION
j
W4
does not have
a
captive
nut.
When disconnecting W4, be careful not
to put side pressure on the cable or the
center conductor
of
A16J1
may
be damaged.
6.
Refer to VIEW
C.
Using
a
large posidnv, remove two screws (item 7) from the
RF
deck.
7.
Refer
to
VIEW
C. Disconnect
W13 from
A18.
Using
a
small posidriv, remove one
screw
(item 3) that holds the A8 casting to the A62
Mother¬
board. While performing this
step, take note of the flange that the (item
3) screw
goes
through.
This flange
will catch on nearby cables when you try to open
the RF deck.
Move the cables out of
the way when swinging the
RF deck
open.
BOTH TOP AND BOTTOM OF INSTRUMENT
8.
While holding W14 clear of A12 (Bottom of instrument), grip any handy component on the RF deck.
Push the entire
RF
deck firmly toward the center of
the instrument (away from the side panel)
and pull
the A8 casting. The RF deck
will
swing open.
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CAUTION
j
To avoid crushing A20 toroid
coils
mounted near
the
RF deck hinge, do
not open
the RF deck
to more than
a
45 degree angle from
its original
position.
Refer to
VIEW
D.
Using
a
small flat-head screwdriver or connector removal
tool, disconnect the
ribbon cable from the A13
SYTM.
j
[
CAUTION
j
Do not attempt to remove the ribbon cable with your fingers or you will
certainly bend pins on the ribbon connector.
9.
Refer to
VIEW
C.
Remove the
following cables from
components
on the
RF
deck:
Ribbon Cable
W31 with
a
small tool, see the above caution.
W29
(Located under W31 ribbon cable. W29
is
marked "A16J4")
W28 (W28
is
marked "A16J3")
W25
(W25
is
marked "LO PLS MOD")
W23 (W23
is
marked "A8-100 IN")
W24 (W24
is marked
"A8-MOD IN")
10.
Refer to
VIEW
C. Using
a
small posidriv,
remove
5
screws,
item
14.
CAREFULLY REMOVE THE RF DECK.
HP 8340B/41B
Reference Loop
-
M/N
Loop Repair Procedures
B-45