HP 5890 SERIES II Service Manual page 27

11. Cap the base of the inlet.
12. Remove the two screws in the top of the inlet
top cover (these screws secure the inlet base
weldment to the inlet top cover).
13. Use a Pozidriv screwdriver to remove the two
screws securing the top cover to the instru-
ment.
14. Lift the inlet top cover off of the inlet.
15. Remove any insulation from around the top of
the inlet.
16. Lift the inlet enough to expose the heated block
and heater/sensor wiring.
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.
16. Lift the inlet out of the instrument.
17. Remove the heated block and heated block
strap from the base weldment by removing two
screws.
18. Remove the top insert weldment and o- ring
from the base weldment.
Use caution to avoid sharp bends when bending
tubing. Sharp bends may crimp the tubing.
19. If the inlet base weldment is to be replaced,
prepare the replacement by pre- bending its
tubing into orientations similar to that of the re-
moved inlet.
20. Secure the heated block and heated block
strap to the base weldment using two screws.
21. Slide the heater and sensor cartridges into the
heated block of the inlet being installed.
22. Install the top insert weldment and associated
o- ring onto the base weldment, ensuring that
the o- ring is installed and seated properly.
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BOTTOM
INSULATION
COVER
O- RING
HEATED BLOCK
SVC 2- 6
HEATER/SENSOR
CABLE ASSEMBLY
PURGED- PACKED
INLET WELDMENT
BOTTOM
INSULATION
SCREW
TOP INSERT
WELDMENT
HEATED BLOCK
STRAP
SCREW
BASE WELDMENT