HP 5890 SERIES II Service Manual page 121

21. Remove the shield from the thermal strap by
carefully working it over the collector lead and
exhaust vent tube. (Depending on the detec-
tor' s location, it may be necessary to bend the
shield to remove and install it. Avoid excessive
bending as this will fatigue the metal shield,
shortening its life.)
22. Remove the thermal strap, working it carefully
over the collector lead and exhaust vent tube.
23. Remove the insulation around the detector
base to expose the two Pozidriv screws which
secure the ECD weldment to the heated block.
24. Cap the base of the detector (inside the column
oven) to avoid damage or contamination of the
detector.
25. Remove the two Pozidriv screws securing the
detector weldment to the heated block
26. Remove the weldment from the heated block.
NOTE
Perform steps 27 through 32 only if it is
desired to remove the ECD heated block.
Otherwise, proceed to step 33.
27. If required, remove the two Pozidriv screws se-
curing the heated block to the instrument.
28. Lift the heated block out of its mounting position.
29. Carefully slide the two cartridges (heater/sensor) out of the block. The smaller of the two car-
tridges is the sensor and must be handled gently in order to prevent breakage.
30. Remove the heated block.
31. Slide heater and sensor cartridges into the new block.
32. Install the new heated block in its mounting position.
33. Secure the heated block to the instrument using two screws.
34. Mount the new weldment, making sure its exhaust vent tube is oriented correctly. (For a cell
installed in the " A"position, its exhaust tube will point towards the front of the instrument. In the
" B" , position the vent tube will point towards the rear of instrument.)
35. Secure the detector weldment to the heated block using two screws.
36. Install the insulation around the detector base.
37. install the thermal strap, working it carefully over the collector lead and exhaust vent tube.
38. Install the shield over the thermal strap. (Depending on the detector' s location, it may be nec-
essary to bend the shield to remove and install it. Avoid excessive bending as this will fatigue
the metal shield, shortening its life.)
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INSULATION
SCREW
SVC 4- 51
SHIELD
THERMAL STRAP
ECD DETECTOR
WELDMENT
HEATED BLOCK