HP 5890 SERIES II Service Manual page 221

Handle the heater and sensor cartridges with care to prevent breakage.
cartridges (particularly the smaller sensor cartridge) are fragile.
29. Carefully slide the heater and temperature sensor cartridges out of the block.
30. Slide the replacement heater and temperature sensor cartridges into the heated block.
31. Install the heated block in its mounting position.
32. Secure the heated block to the instrument using two screws.
33. Install the insulation around the detector base.
34. install the thermal strap, working it carefully over the collector lead and exhaust vent tube.
35. 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.)
The following steps require protection against ESD (Electro- Static Discharge).
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Use a grounded wrist strap (part no. 9300- 0969 - large, or 9300- 0970 - small)
connected to a suitable ground. Failure to heed this caution may result in
damage to the instrument.
When handling PCBs (Printed Circuit Boards), always place them in static
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control envelopes.
36. Install the detector PCB at the right side of the instrument. (This will feed the interconnect in to
the detector clamps on the thermal strap.)
39. Tighten the screws securing the clamps which hold the interconnect in place.
40. Connect the cell collector lead to the PCB interconnect.
41. Position the detector cover over the detector.
42. Secure the detector cover to the thermal strap with three screws.
43. Remove the cap from the base of the detector (inside the column oven).
44. Install any hardware removed in step 2 of this procedure (liner, column/liner nuts, ferrules,
makeup gas adapter,etc.).
45. Install the rear panel and secure using four screws.
46. Install the right side panel and secure using four screws.
47. Install the electronics carrier top cover.
48. Install the hinged top cover and secure using a screw and washer.
49. Connect the ground strap to the hinged top cover using a screw.
50. Restore all gas supplies.
51. Restore power to the instrument.
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