HP 5890 SERIES II Service Manual page 124

10. Remove the screw securing the ground strap to
the hinged top cover
11. With the lower right side of the cover pushed in, lift the right side of the cover and slide it to the
right to remove the top cover and lid shaft as a unit.
12. Using a Pozidriv screwdriver, remove the screw
securing the detector top cover to the thermal
strap.
13. Remove the detector top cover.
14. Disconnect any tubing attached to the detector
purge and vent tubes.
15. Disconnect the cell anode lead from the PCB
interconnect.
16. Loosen the locking screw on the ECD cover
17. Slide the locking tab on the ECD cover back,
freeing the cover from the anode shaft of the
cell weldment.
18. Carefully slide the ECD cover over the anode
shaft and anode, and remove it from the detec-
tor.
19. Cap the base of the detector (inside the column
oven) to avoid damage or contamination of the
detector.
20. Remove the two Pozidriv screws securing the
detector weldment to the upper and lower
heated blocks.
21. Remove the weldment and upper heated block
from the lower heated block.
22. Remove any insulation from around the base of
the weldment.
NOTE
Perform steps 23 through 31 only if it is
desired to remove the ECD heated block.
Otherwise, proceed to step 32.
23. If required, remove the two Pozidriv screws se-
curing the heated block to the instrument.
24. Lift the heated block out of its mounting posi-
tion.
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TOP COVER
ECD COVER
CELL WELDMENT
SOCKET
SCREW
BOTTOM
INSULATION
BOTTOM INSULATION
SVC 4- 54
ANODE
ANODE WELDMENT
SCREW
UPPER
HEATED
BLOCK
ANODE RETAINING NUT
ANODE FERRULE
UPPER CELL
WELDMENT
PLATED
LOWER
BODY
LOWER HEATED BLOCK