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TELEDYNE API
General Troubleshooting & Repair of the M703E Calibrator M703E Calibrator Operators Manual
Table 11-1: Front Panel Warning Messages (cont.)
WARNING FAULT CONDITION POSSIBLE CAUSES
RELAY BOARD WARN
The CPU cannot
communicate with the
Relay PCA.
- I
2
C Bus failure
- Failed relay PCA
- Loose connectors/wiring
SYSTEM RESET
The computer has
rebooted.
- This message occurs at power on.
- If it is confirmed that power has not been interrupted:
- Failed +5 VDC power
- Fatal error caused software to restart
- Loose connector/wiring
11.1.2. FAULT DIAGNOSIS WITH TEST FUNCTIONS
Besides being useful as predictive diagnostic tools, the test functions viewable from the calibrators front panel
can be used to isolate and identify many operational problems when combined with a thorough understanding of
the calibrators Theory of Operation (see Chapter 9).
The acce
ptab
le ranges for these test functions are listed in the “Nominal Range” column of the calibrator Final
Test and Validation Data Sheet shipped with the instrument. Values outside these acceptable ranges indicate a
failure of one or more of the calibrator’s subsystems. Functions whose values are still within the acceptable
range but have significantly changed from the measurement recorded on the factory data sheet may also
indicate a failure.
A worksheet has been provided in Appendix C to assist in recording the value of these Test Functions.
Table 11-2 contains some of the more common causes for these values to be out of range.
Table 11-2: Test Functions - Indicated Failures
TEST FUNCTION DIAGNOSTIC RELEVANCE AND CAUSES OF FAULT CONDITIONS.
O3 GEN REF
1
Possible causes of faults are the same as O3 GEN REFERENCE WARNING from Table
11-1
OUTPUT FLOW
Gas flow problems directly affect the concentration accuracy of the M703E’s O
3
calibration
gases. This number is computed using data from the calibrator’s
- Check for Gas Flow problems.
- Check the pressure regulator
O3 GEN DRIVE
Check the O
3
generator heater and temperature sensors
Possible causes of faults are the same as
O3 GEN LAMP TEMP WARNING
from Table 11-1
O3 LAMP TEMP
Incorrect Lamp temperature can affect the efficiency and durability of the O
3
generators UV
lamp.
Possible causes of faults are the same as
O3 GEN LAMP TEMP WARNING from Table
11-1
REG PRESSURE
Same as REGULATOR PRESSURE WARNING from Table 11-1
BOX TEMP
If the Box Temperature is out of range, make sure that the:
Box Temperature typically runs ~7C warmer than ambient temperature.
- The Exhaust-Fan is running
- The there is sufficient open space to the side and rear of instrument to allow adequate
ventilation.
(table continued)
180 05744 Rev B