HP 5890 SERIES II Service Manual page 142

17. Use a 9/16 inch wrench to loosen the nut hold-
ing the weldment exit tube to the jet assembly.
It will be necessary to hold the jet assembly
with a 1/2- inch wrench to prevent rotation.
18. Pull the heater and sensor from the detector
weldment assembly.
19. Carefully lift the detector, vertically, from the
transfer tube, so as not to damage the fused
silica liner.
20. Remove the o- ring from the flange adapter on
the detector weldment.
21. Remove the flange adapter and flange ring by removing the four screws securing them to the
stainless steel coupling.
22. Remove the second heat shield window and two associated o- rings from the stainless steel
coupling.
23. Remove the stainless steel coupling and heat shield disk from the detector weldment by remov-
ing four screws and lock washers.
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WELDMENT
HEAT SHIELD GASKET (19256- 80040)
FIRST HEAT SHIELD WINDOW
HEAT SHIELD DISK
STAINLESS STEEL
COUPLING
SCREW
LOCK WASHER
CLAMP
SVC 4- 72
O- RING (0905- 1104)
SECOND HEAT
SHIELD WINDOW
O- RING (0905- 0955)
FLANGE ADAPTOR
FLANGE RING
SCREW
JET WELDMENT
O- RING
VESPEL FERRULE
BRASS NUT
O- RING (0905- 1103)