Troubleshoot
July 29, 2013, 715003794 Rev. B 243
Turn off the gradient proportioning valve
Turning off the gradient proportioning valve (GPV) is useful when you replace
an inlet check valve cartridge (see “Replace an inlet check valve cartridge” on
page 194).
To turn off the gradient proportioning valve, select Turn Off GPV in the Other
Diagnostics screen, and then press OK. The screen notifies you about the
current state of the GPV.
Verify the firmware checksum
Run the firmware checksum function to test the installation of the firmware
by displaying and checking the checksum value.
To view the firmware checksum, select Firmware checksum in the Other
Diagnostics screen. The checksum and its accuracy are displayed.
Troubleshoot
This section provides information for troubleshooting the separations module.
It addresses these topics:
• General troubleshooting hints
• Chromatography troubleshooting
• Hardware troubleshooting for the:
–System
– Solvent management system
– Sample management system
Tip: See “Safety and handling” on page 219, for information on safety and
handling considerations while you troubleshoot the separations module.
General troubleshooting hints
To perform basic troubleshooting steps:
1. Examine the system, first considering the likely causes of a problem.
Unresponsive instruments can mean that power or signal cables are
disconnected or improperly connected. A fluid or vacuum leak can
indicate defective tubing and valve connections.
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