Model 200AU-NOy Option Manual Addendum
6.0 Troubleshooting, Adjustments NOTE
THE OPERATIONS OUTLINED IN THIS CHAPTER ARE TO BE
PERFORMED BY QUALIFIED MAINTENANCE PERSONNEL
ONLY!
This section of the manual contains information on diagnosing and repairing converter
performance problems.
This Section provides troubleshooting procedures that address problems to the board level. For
component level troubleshooting, consult the schematics for the appropriate board in the
Appendix.
6.0.1 General Troubleshooting Hints
1. Think of the M501Y as two sections:
A. Section 1 - Pneumatics - Over 50% of all instrument problems are traced to leaks
in the M200AU, pump assembly, pole mounted converter assembly, sample filter,
or zero/span gas delivery system (calibrator). Suspect a leak first.
B. Section 2 - Electronics – converter temp control board or DC power supply for
the converter temperature readout.
2. Incorrect span gas concentration - this could come either from the calibrator or entering
the expected span gas concentration in the M501Y incorrectly, see Table 7.3 in the
M200AU manual.
3. If the instrument does not respond to span gas, check Section 9.2.3 in the M200AU
manual.
The above should get you started in diagnosing and repairing the most common faults. If these
reasons have been eliminated, the next thing to do is a Factory Calibration covered in M200AU
manual. If difficulties persist, contact our service department. The 800 telephone number is on
the cover page of this manual.
6.1 Operation Verification - M501Y Diagnostic Techniques
6.1.1 Pneumatic System
The pneumatic system is diagramed in Figure 5.3.
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