HP 5890 SERIES II Service Manual page 24

11. Remove any insulation from around the top of
the inlet.
12. Use a Pozidriv screwdriver to remove the two
screws securing the inlet and insulation plate to
the instrument. (Depending on the age of the
instrument, the insulation plate may be flat, as
shown at the left, or may be a box, as shown
below.
13. Lift the inlet enough to expose the heated block and heater/sensor wiring.
14. Remove any insulation from around the base of the inlet.
Handle the heater and sensor cartridges with care to prevent breakage. The cartridges
(particularly the smaller sensor cartridge) are fragile.
15. Carefully slide the heater and sensor cartridges out of the heated block portion of the inlet.
Use caution to avoid sharp bends when bending tubing. Sharp bends may crimp the tubing.
16. If the inlet is to be replaced, prepare the replacement inlet by pre- bending its tubing into orien-
tations similar to that of the removed inlet.
17. Slide the heater and sensor cartridges into the heated block of the inlet being installed.
19. Replace any insulation that was removed from
around the base of the inlet.
18. Carefully install the inlet and insulation plate,
securing it to the instrument with two Pozidriv screws.
19. Replace any insulation that was removed from
around the inlet.
20. Bend the tube running from the installed inlet to
the inlet flow control components so that it lays
within the " U" - shaped channels to the left of
the inlet.
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INSULATION
PLATE
SLOTS
SVC 2- 3