Proper Configuration - HP 5890 Series II Plus Reference Manual

Chromatographic Troubleshooting
Electronic pressure control

Proper configuration

If the inlet is not working at all, there may be a configuration problem.
1. Turn GC power off, and remove the side panel of the GC.
2. Check if the red switches on the inlet controller board are set for your
configuration.
3. Turn the GC on.
220