Troubleshooting and Service Teledyne API – Model T300/T300M CO Analyzer

258

Table 13-1: Warning Messages – Indicated Failures (cont.)

WARNING
MESSAGE FAULT CONDITION POSSIBLE CAUSES
SAMPLE TEMP
WARN
Sample temperature is < 10oC or >
100oC.
Ambient temperature outside of specified range
Failed bench heater
Failed bench temperature sensor
Relay controlling the bench heater
Failed relay board
I2C bus
SOURCE WARNING
Occurs when CO Ref is <1250
mVDC or >4950 mVDC.
Either of these conditions will result
in an invalid M/R ratio.
GFC Wheel stopped
Failed sync/demod board
If status LEDs on the sync/demod board ARE flashing the cause is
most likely a failed:
IR source
Relay board
I2C bus
IR photo-detector
SYSTEM RESET The computer has rebooted.
This message occurs at power on. If you have not cycled the power
on your instrument:
Failed +5 VDC power,
Fatal error caused software to restart
Loose connector/wiring
WHEEL TEMP
WARNING
The filter wheel temperature is
controlled at 68 2 °C
Blocked cooling vents below GFC Assembly. Make sure that
adequate clear space beneath the analyzer.
Analyzer’s top cover removed
Wheel heater
Wheel temperature sensor
Relay controlling the wheel heater
Entire relay board
I2C bus

12.1.2. FAULT DIAGNOSIS WITH TEST FUNCTIONS

Besides being useful as predictive diagnostic tools, the test functions viewable from the

front panel can be used to isolate and identify many operational problems when

combined with a thorough understanding of the analyzer’s Theory of Operation (see

Section 13).

The acceptable ranges for these test functions are listed in the “Nominal Range” column

of the analyzer Final Test and Validation Data Sheet (T300, P/N 04307 and T300M,

P/N 04311) shipped with the instrument. Values outside these acceptable ranges

indicate a failure of one or more of the analyzer’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.

Note A worksheet has been provided in Appendix C to assist in recording the

value of these test functions. This worksheet also includes expected

values for the various test functions.

06864B DCN6314