HP 5890 SERIES II Service Manual page 153

26. 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.
27. If installed, remove the PCOC fan cover to allow
removal of the tubing attached to the detector
weldment.
28. Trace the tube from the FPD base detector
weldment to the connection point at the left
side of the instrument.
29. Disconnect the M8 fitting securing the tube at
its connection site. (The fitting should only be
finger- tight. If more force is required to free it,
use a small pair of pliers while holding the
applicable connector site with an appropriate
tool.)
30. Locate the " U- shaped"slots on the instrument
to the left of the inlet. Bend the tube from the
new weldment to lay within these slots, and any
installed clips, and route it to its associated at-
tachment point on the left side of the instru-
ment.
When installing tubing in the applicable flow
control component, ensure that all o- rings
are positioned properly.
31. Connect the tube from the new detector base
weldment to the flow manifold block. (The hy-
drogen tube fitting is painted RED. Make sure
that the tube is installed at the correct location
on the flow manifold block.)
32. If the PCOC fan and cover were removed, in-
stall them and secure using two screws.
33. Install the new detector base weldment and secure using two screws.
It is advisable to install a new fused silica liner while the detector is this state of
disassembly. The following step is only applicable when installing a new liner.
34. Install a new liner and ferrule by feeding the liner through the o- ring at the top of the transfer
tube, being careful not to damage the o- ring. The silica liner should extend above the top of
the transfer tube approximately 6- 7mm
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SCREW
FAN
SHROUD
COOLING
FAN
NOTE
SVC 4- 83
FLOW
DIRECTION
ARROW
SLOTS