Replacing A Gang Fitting Restrictor Or O-Ring; Replacing The Ptv Thermocouple Pcb - Agilent Technologies 6890 Series Service Manual

9. Replace the gang weldment or front trap assembly and reassemble in
reverse order.
10. Check the system for leaks.

Replacing a gang fitting restrictor or O-ring

1. Turn off the oven and the inlet and allow them to cool.
WARNING Turn off the oven and the inlet and allow them to cool. Turn off all flows at
the initial gas supply. Then turn off the main power switch and unplug the
power cord.
2. Remove the top cover, the inlet fan cover, the inlet cover, and the
pneumatics chassis cover.
3. Remove the screw in the gang fitting. Gently tap the fitting to remove the
restrictor for cleaning/replacement. Inspect the O-rings and replace if
necessary.
4. Reassemble in reverse order.
Check the plumbing for leaks.

Replacing the PTV thermocouple PCB

Caution Follow ESD precautions when performing this procedure.
WARNING Turn off the oven and the inlet and allow them to cool. Turn off all flows at
the initial gas supply. Then turn off the main power switch and unplug the
power cord.
1. Remove the top cover, the inlet fan cover, the inlet cover, the left side
panel, the top rear panel, the RFI cover, and the pneumatics chassis cover.
2. Remove the PTV manifold as described in Replacing the PTV manifold
assembly.
Jun 2001
Programmed Temperature Vaporization Inlet (PTV)
Inlets
Agilent 6890 Gas Chromatograph Service Manual
Replacement procedures
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