HP 5890 SERIES II Service Manual page 219

` Remove/Replace ECD (19233A/19235A VERSIONS) Heater and Sensor
Cartridges
PERFORM THE PROCEDURE FOR DISCONNECTING/CONNECTING HEATER AND
TEMPERATURE SENSOR WIRING ON MAIN PCB BEFORE PERFORMING THIS
PROCEDURE.
1. Allow time for the oven and heated zones to
cool.
2. At the bottom of the detector to be removed,
inside the column oven, remove the column
and hardware associated with the detector(s)
(liner, column/liner nuts, ferrules, makeup gas
adapter,etc.).
3. Remove the injection port cover by grasping its
back edge and lifting it upward.
4. Lift the hinged top cover at its front edge,
exposing the detector area.
5. Remove the 1/4 inch screw and washer
securing the cover at its right side
hinge point.
6. At the lower right edge of the cover,
press from right- to- left until the right
side hinge releases.
7. Remove the screw securing the ground
strap to the hinged top cover
8. 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.
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LID SHAFT
SVC 6- 28
INJECTION PORT COVER
TOP COVER
PRESS
HERE TO
FREE COVER
1/4- INCH SCREW
AND WASHER