88 Agilent 8453 Dissolution Testing System Installing and Operating Manual
4 Using the Valve Unit and Valve-pump Controller
Troubleshooting Your Valve System
Troubleshooting Your Valve System
This section has two subsections: Use “Checking the Problem” on page 88 to
identify the problem, follow the instructions, and then use “Solving Your
Problem” on page 91 to correct the problem.
Checking the Problem
This subsection helps you check these problems:
• “Valve Unit does not Operate” on page 88
• “Leaking Tubing Connectors at Valve” on page 89
• “Leaking Valve” on page 89
• “Contamination Between Ports” on page 90
Valve Unit does not Operate
1 Check the valve unit is connected to the valve-pump controller, see
“Connecting Cables” on page 44.
2 Check the power cord for the valve-pump controller is connected, see
“Connecting Cables” on page 44, and check the line power switch is on.
3 Check the fuse is intact. If the fuse is defective, see “Selecting Fuse” on
page 40.
4 Check the valve unit operates in manual mode, see “Operating Manually” on
page 87.
a If the valve unit operates in manual mode only, there is probably an
electronic fault in the connections between the valve unit and the
spectrophotometer. Call Agilent Technologies.
b If valve unit does not operate in manual mode:
Remove valve, see “Changing Valve” on page 92, and check manual
operation of the valve drive assembly.
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