Varian 990 dCLD II, Operation Manual

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6-1
Model 990 dCLD II Component Leak Detector
Section 6. Troubleshooting
This section provides general guidelines to help diagnose and correct common problems
that may be encountered on 990 dCLD II systems. For additional assistance on specific
990 dCLD II product issues, please contact Varian.
6.1 General
Start by recording all symptoms encountered, including any quantitative data.
NOTE
Be sure to keep a calibration and maintenance log, and keep it
current.
Verify the following before checking for the other symptoms listed in this section.
❑
The power cord is connected.
❑
All cables between the 990 dCLD II control unit, the cal leak valve block, the turbo
pump, and the spectrometer tube are properly installed.
❑
All connections between the 990 dCLD II control unit and the testing station are
properly installed.
❑
The POWER LED is on, or if the optional front control panel is installed, the LED
above the HOLD/VENT button is lit.
❑
All controls for calibration and set points are set to the proper values.
❑
Consult your maintenance log and setup processes for this information.
For procedures to check these values, see Table 2-11 on page 2-15, and then
Section 4 “Setup and Monitor Operations via the Optional Front Control Panel” on
page 4-1 or Appendix A “Communications Protocol” and Appendix B “Customer
Accessible Inputs and Outputs” as necessary.
❑
If applicable, that the oil level and color in all oil-sealed mechanical pumps has
been checked or that the oil was recently changed and, that maintenance to
customer-supplied mechanical pumps has been performed.