HP 5890 SERIES II Service Manual page 210

9. Remove the two screws securing the detector to
the instrument and then lift the block up enough to
expose the heater and sensor cartridge wires.
Handle the heater and sensor cartridges with care to
prevent breakage. The cartridges (particularly the
smaller sensor cartridge) are fragile.
10. Carefully slide the three cartridges out of the block. The two
smaller cartridges are the sensors and must be handled gently in
order to prevent breakage. (The delta- t temperature sensor cartridge
is identified by its wiring, which is connected to the top of the TCD detector PCB)
Replacement of the delta- t temperature sensor is covered later in this section.
11. Install the replacement heater and temperature sensor, and the old delta- t temperature sensor
cartridges into the heated block.
12. Carefully install the detector, securing it to the instrument with two screws.
13. Remove the caps from the detector base and the vent port.
When installing insulation, use care not to plug the vent port. If flow is interrupted while the TCD
is on, it will shorten its life dramatically.
14. Taking care not to block the vent port, install insulation around the detector block.
Use caution not to crimp the filament and delta- t sensor leads when installing the TCD detector
cover.
15. Install the TCD detector cover and secure using
two screws.
16. Install column and any other hardware removed
in step 2 of this procedure.
17. Install the right side panel and secure using two screws.
18. Install the electronics carrier top cover.
19. Slide the rear cover on to the instrument.
20. Secure the rear cover to the instrument by installing and tightening four screws.
21. Restore gas supply pressure.
22. Restore power to the instrument.
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NOTE
SVC 6- 19
DELTA-T
SENSOR
HEATER
TEMPERATURE
SENSOR
DETECTOR COVER