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Jun 2001
Detectors
Agilent 6890 Gas Chromatograph Service Manual
Thermal Conductivity Detector (TCD) 330
Replacement procedures
Figure 330-18 Gas line connections
14. Restore gas pressures and leak check all fittings.
Replacing the detector interface card
WARNING Before proceeding, turn off the detector and any detector gases at their
supply. Then turn off the main power switch and unplug the power cord.
Caution Make sure you are properly grounded with an ESD strap before continuing.
1. Unplug the switching valve lead from the P1 connector on the interface
card.
2. Disconnect the TCD filament lead wires. The TCD filament leads run from
the detector to the detector interface card. Disconnect the filament leads
from the detector interface card by using a small flat blade screwdriver
to push down on the connector tabs while you pull out the filament leads.
3. If your card has a ∆PRT installed, disconnect the sensor leads from the
card. Use a small flat blade screwdriver to push down on the connector
tabs while you pull out the leads.
4. Pull the card directly out from the main board.
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