Repair Procedures; Repair Procedures; Placing The Yo Assembly Into The Service Position - HP 8340B Manual
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Sweep Generator
-
YO
Loop
Repair Procedures
PLACING
THE YO ASSEMBLY INTO THE SERVICE POSITION
Equipment Required
Pozidnve 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
3
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.
(
CAUTION
}
<'w^^^^w>
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
Change
10
HP 8340B/41B
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