HP 5890 SERIES II Service Manual page 143

24. Remove the jet weldment from the base of the weldment. (The jet weldment is not threaded; it
is pressed in.)
NOTE
It may be necessary to use a suitable hex drive
(or other strong shaft- like device) to drive out
the jet weldment by inserting the device
through the exhaust coupler (at the top of the
weldment) and striking it with a hammer.
25. Insert the eraser end of a pencil (or other suit-
able device) through the jet opening, at the
base of the detector weldment, and force the
first heat shield window out of the detector
weldment.
Due to the composition of the first heat shield gasket, it may be difficult to remove the
first heat shield window from the detector weldment. If difficulties are encountered, it
may be necessary to use a sharp implement to pry the first heat shield window out of
the detector weldment. This may cause chipping or breakage of the window, in which
case it must be replaced. Also, if chipping or breakage occurs, use an inert gas to
blow any fragments out of the detector weldment, and clean the weldment with an
approved solvent.
26. Remove the heat shield gasket from the detector weldment.
27. Clean the detector weldment with an approved solvent.
28. Blow out any particles or contaminants using an inert gas.
29. If a PCOC fan is installed, remove the back cov-
er of the instrument by removing four screws
and sliding the cover off of the rear of the in-
strument.
30. If installed, remove the PCOC fan cover to allow
removal of the tubing attached to the detector
weldment.
31. Trace the tubing from the FPD jet to the con-
nection points at the left side of the instrument.
32. Disconnect the M8 fittings securing the tubing
at their connection sites. (The tubing should
only be finger- tight. If more force is required
to free them, use a small pair of pliers while
holding the applicable connector sites with an
appropriate tool.)
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NOTE
SCREW
FAN
SHROUD
COOLING
FAN
SVC 4- 73
FLOW
DIRECTION
ARROW