Troubleshooting and Service Teledyne API Model T360/T360M Operation Manual
228
WARNING
MESSAGE
FAULT CONDITION POSSIBLE CAUSES
SOURCE
WARNING
Occurs when CO
2
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 LED’s on the sync/demod board ARE flashing the
cause is most likely a failed:
IR source
Relay board
I
2
C 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:
o Failed +5 VDC power,
o Fatal error caused software to restart
o 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
I
2
C bus
8.1.2. 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
principles of operation (see Section 7).
The acceptable ranges for
these test functions are listed in the “Nominal Range”
column of the analyzer Final Test and Validation Data Sheet (p/n 04307) 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. A worksheet has
been provided in Appendix C to assist in recording the value of these test
functions.
Table 8-2 contains some of the more common causes
for these values to be out of
range.
