HP 8341b - Page 444

Sweep
Generator
—
YO
Loop
Repair
Procedures
PLACING
THE YO ASSEMBLY
INTO
THE SERVICE POSITION
Equipment
Required
Pozidrive
screwdriver
1/4
inch
open
end
wrench
5/16
inch
open
end
wrench
Procedure
1.
Remove
the
top
and
bottom
covers
from
the
instrument.
Place
the
instrument
so
that
it
is
in its
normal operating
position. Refer
to
Figure
D-8,
W3
Connection.
2.
Using
the
two
wrenches
listed
above,
disengage
W3
from the cable
coming from
the
other
side
of the
motherboard.
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CAUTION
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It
is
critical
that
step
2
be
performed
before
proceeding or damage
to
the
instrument
will
result.
3.
Turn
the
instrument
upside-down.
Refer to
Figure
D-9,
YO
Loop Removal. Remove
the
cables
going
to
A49J2
and A49J3.
Remove
the
three
screws
shown
as
item
1. Remove
the
screw
shown
as
item
2.
Item
1
screws are
different
from
the
item
2
screws,
keep
them
separate.
4.
Refer
to
Figure
D-10,
YO
Loop
in
Service
Position,
before
proceeding.
Gently
pull
on
the
YO
loop
while
moving
it
from
side-to-side.
Do
not
use
excessive
force.
Remove
the
YO
loop
assembly
and
hold
it
upright.
Set
the
retaining tabs
over
the
adjacent
aluminum
divider.
The
locking
screw
can
now
be
engaged
to
hold
the
YO
loop
securely
in
place.
Replace
the
cables
going
to
A49J2
and A49J3.
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I
CAUTION
j
CAUTION i
When
replacing
the
YO
loop
assembly,
be
careful not
to
smash
the
ribbon
connector,
A50W1.
5.
To
reinstall
the
YO
loop,
reverse
the
above
procedure.
D-36
Sweep Generator
-
YO
Loop Assembly-Level
Troubleshooting
HP
8340B/41B