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TROUBLESHOOTING & REPAIR PROCEDURES Model 360E Instruction Manual
Table 11
-1: Warning Messages – Indicated Failures (cont.)
WARNING
MESSAGE
FAULT CONDITION POSSIBLE CAUSES
SAMPLE TEMP
WARN
Sample temperature is < 10
o
C or >
100
o
C.
Ambient temperature outside of specified range
Failed bench heater
Failed bench temperature sensor
Relay controlling the bench heater
Failed relay board
I
2
C buss
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 buss
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 buss
11.1.2. 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 Chapter 10).
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 11-2 contains some of the more common causes for these values to be out of range.
194 05232 Rev B3