Replacement Procedures; Replacing The Pcm - Agilent Technologies 6890 Series Service Manual

Gas chromatograph

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Pneumatics Control Module

Replacement procedures

Hazardous voltages are present in the mainframe when the GC power cord is

plugged in. Avoid a potentially dangerous shock hazard by unplugging the

power cord before removing the side panels.

Prevent electrostatic voltages from damaging the GC by using precautions

such as an ESD wrist strap.

Turn off the GC and unplug the power cord. Allow time for all heated

zones to cool and then turn off supply gases at their sources.

Remove the gas supply line to the manifold.

Remove the injector, tray, and bracket (if present).

Remove the top cover, the pneumatics top cover, the RFI cover, the inlet

fan cover, the inlet cover (or tray mounting bracket, as applicable), the

left side panel, and the top rear panel.

Board components can be damaged by static electricity; use a properly

grounded static control wrist strap when installing the flow module.

Remove the PCM ribbon cable from the pneumatics control board. If the

PCM is in the back position and there is an inlet in the front position,

also unplug the front inlet's ribbon cable from the pneumatic control

Agilent 6890 Gas Chromatograph Service Manual

6890a 6890 plus