HP 5890 SERIES II Service Manual page 226

9. Remove the exhaust tube from the detector using a 9/16- inch wrench.
10. Remove the chimney assembly by removing
the two screws securing it to the chimney back.
11. Loosen the three screws which secure the
clamp which secure the detector to the chim-
ney back.
12. Use a 9/16 inch wrench to loosen the brass nut
holding the weldment exit tube to the jet weld-
ment. It will be necessary to hold the jet assem-
bly with a 1/2- inch wrench to prevent rotation.
Handle the heater and sensor cartridges with
care to prevent breakage.
(particularly the smaller sensor cartridge) are
fragile.
13. Pull the heater and temperature sensor car-
tridges from the detector weldment assembly.
14. Carefully lift the detector, vertically, from the
transfer tube, so as not to damage the fused
silica liner.
Handle the heater and sensor cartridges with care to prevent breakage.
cartridges (particularly the smaller sensor cartridge) are fragile.
15. Remove the second heater cartridge from the
lower heater block.
16. Install the replacement heater cartridge in the
lower heater block.
17. Install the assembled detector weldment as-
sembly vertically onto the transfer tube weld-
ment, being careful not to damage the fused
silica
liner.
18. Install the heater and temperature sensor car-
tridges into the detector weldment.
19. Secure the weldment exit tube to the jet assem-
bly with by holding the jet weldment with a
1/2- inch wrench, and tightening the nut which
secures the weldment with a 9/16- inch
wrench.
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HEATER/
SENSOR
OPENINGS
The cartridges
CLAMP
SECURING
SCREWS
SVC 6- 35
CHIMNEY
SCREW
The
HEATER CARTRIDGE
TRANSFER TUBE WELDMENT
LOWER HEATER BLOCK