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3. Turn off all flows at the initial gas supply.
4. Turn off the main power switch and unplug
the power cord.
5. Remove the top cover, the inlet fan cover,
the inlet cover, the top rear panel, and the
pneumatics chassis cover.
6. Remove the column.
7. Loosen the three captive Torx screws which
secure the inlet to the oven, and lift the PTV
inlet out of the oven.
Released: April 2004
8. To replace the PTV gang weldment, discon-
9. To replace the PTV front trap assembly, dis-
10. Unscrew the filter assembly and remove the
6850 Series Gas Chromatograph Service Procedures
nect the plumbing block from the PTV module
assembly. Then, disconnect the carrier gas
line and the septum purge line (septum head
only) from the inlet. Unscrew the filter trap
assembly and remove the PTV gang weld-
ment assembly.
connect the split vent line from the inlet.
PTV front trap assembly.
101
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