HP 5890 SERIES II Service Manual page 80

17. Install the new solenoid valve body on the mounting bracket in the same location and position
as the old one.
18. Secure the solenoid valve bracket to the instrument using two screws.
Use caution when removing and installing
the plastic M8 tubing nuts. Excessive force
can damage them.
NOTE
When installing tubing at the solenoid
valve, ensure that all O- rings are
positioned properly.
19. Connect and tighten tubing from the detector to
the solenoid switching valve, finger- tight. En-
sure that the tubing is installed at their
proper fittings on the TCD solenoid valve (as
noted during removal).
20. Restore the gas supply to the system and
check for leaks at all installed fittings.
21. If the system is leak- free, install the right side
panel and secure using four screws.
22. Install the electronics carrier top cover.
Ensure that all gas supplies are on and all connections are made before applying
power to the instrument. If flow is interrupted while the TCD is on, damage to the
detector will occur.
23. Restore power to the HP 5890 Series II.
24. Verify operation of the TCD solenoid switching valve by turning on the detector via the keyboard
and listening for the solenoid valve to cycle from one state to the other at a steady rate.
25. Run a TCD Test Sample Chromatogram (refer to HP 5890 Series II Reference Manual) to ensure
that the system is operating properly. (If reversed peaks are experienced, the most likely cause
is reversed gas tubes connected to the TCD solenoid valve.)
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TO DETECTOR
SVC 4- 10
SOLENOID VALVE
SUPPORT
BRACKET
TO FLOW
BLOCK