083730300A DCN8101 Maintenance and Service 113
WARNING - Risk of Electrical Shock
Some operations need to be carried out with the instrument open and
running.
Exercise caution to avoid electrical shocks and electrostatic or
mechanical damage to the analyzer.
Do not drop tools into the analyzer or leave those after your procedures.
Do not shorten or touch electric connections with metallic tools while
operating inside the analyzer.
Use common sense when operating inside a running analyzer.
The analyzer has been designed so that problems can be rapidly detected, evaluated and
repaired. During operation, it continuously performs diagnostic tests and provides the
ability to evaluate its key operating parameters without disturbing monitoring operations.
A systematic approach to troubleshooting will generally consist of the following five steps
(some are listed in :
1. Note Alerts and take corrective action as necessary.
2. Examine the values of all TEST functions and compare them to factory values. Note
any major deviations from the factory values and take corrective action.
3. Use the internal electronic status LEDs to determine whether the electronic
communication channels are operating properly.
• Verify that the DC power supplies are operating properly by checking the
voltage test points on the relay PCA.
• Note that the analyzer’s DC power wiring is color-coded and these colors
match the color of the corresponding test points on the relay PCA.
4. SUSPECT A LEAK FIRST!
• Technical Support data indicate that the majority of all problems are
eventually traced to leaks in the internal pneumatics of the analyzer or
the diluent gas and source gases delivery systems.
• Check for gas flow problems such as clogged or blocked
internal/external gas lines, damaged seals, punctured gas lines, a
damaged / malfunctioning pumps, etc.
5. Follow the procedures defined in Section 5.7.14 to confirm that the analyzer’s vital
functions are working (power supplies, CPU, relay PCA, touchscreen, etc.).
• See Figure 2-4 for the general layout of components and sub-assemblies
in the analyzer.
• See the wiring interconnect diagram and interconnect list in Appendix B.
5.7.1 CLEANING EXTERIOR SURFACES OF THE T300/T300M
If necessary, the exterior surfaces of the T300/T300M can be cleaned with a clean damp
cloth. Do NOT submerge any part of the instrument and do NOT use any cleaning
solution.
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