HP 5890 SERIES II Service Manual page 125

25. Carefully slide the two cartridges (heater/sen-
sor) out of the block. The sensor enters the
block from the top. The heater enters from be-
low. The smaller of the two cartridges is the
sensor and must be handled gently in order to
prevent breakage.
26. Remove any insulation from around the base of the removed weldment and inside the lower
heated block.
27. Remove the lower heated block.
28. Install the removed insulation in the lower heated block.
29. Slide heater and sensor cartridges into the new block.
30. Install the lower heated block in its mounting position.
31. Secure the lower heated block to the instrument using two screws.
32. Install any removed insulation in the lower heated block.
33. Place the new weldment in the lower heated block.
34. Install the upper heated block on the weldment.
35. Secure the upper heated block and detector weldment to the lower heated block using two
screws.
36. Remove the cap from the base of the detector (inside the column oven).
37. Carefully slide the ECD cover over the anode shaft and anode, and install it on the detector.
38. Slide the locking tab on the ECD cover forward, capturing the cover over the anode shaft of the
cell weldment.
39. Tighten the locking screw on the ECD cover
40. Connect the cell collector lead from the cell anode to the PCB interconnect.
41. Position the detector cover over the detector.
42. Secure the detector cover to the instrument with a screw.
43. Install any hardware removed in step 5 of this procedure (liner, column/liner nuts, ferrules,
makeup gas adapter,etc.).
44. Plug the detector purge and exhaust vent tubing.
45. Restore supply pressure, and check for leakage at the column and makeup gas adapter fit-
tings.
46. If no leaks exist, shut off the supply pressure.
47. Remove the plug from the detector purge and exhaust vent tubes.
48. Connect the purge and exhaust vent tubes to the applicable tubes disconnected in step 14.
49. Install the right side panel and secure using four screws.
50. Install the electronics carrier top cover.
51. Install the hinged top cover and secure using a screw and washer.
52. Connect the ground strap to the hinged top cover using a screw.
53. Restore power to the instrument.
Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com
SVC 4- 55