HP 5890 SERIES II Service Manual page 231

10. Remove the electronics carrier top cover
(above the signal cable plugs and receptacles
to expose the top edge of the TCD detector
PCB).
11. Disconnect the detector filament and delta- t
temperature sensor leads at their connector
block on the detector PCB. Use a small flat-
blade screwdriver to press each wire lead
release (located adjacent to each connec-
tion).
12. Remove the preformed thermal insulation from
around the detector to expose the two screws
securing the detector to the instrument main-
frame.
13. On a series- connected TCD, disconnect the
TCD to FID jumper tube from the TCD oven- re-
turn exhaust vent port.
14. Remove the two screws securing the detector
to the instrument and then lift the block up
enough to expose the heater and sensor car-
tridge wires.
15. Carefully slide the three cartridges out of the
block. The two smaller cartridges are the sen-
sors and must be handled gently in order to
prevent breakage.
20. Install the heater, temperature sensor, and replacement delta- t sensor cartridges into the
heated block.
21. Carefully install the detector, securing it to the instrument with two screws.
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ELECTRONICS
CARRIER TOP
COVER
SVC 6- 40
DELTA- T
SENSOR
CONNECTION
LOCATION
STRIPPED END
OF TCD
FILAMENT LEAD
HEATER
TEMPERATURE
SENSOR
PRESS
HERE
DELTA-T
SENSOR