Fault Diagnosis With Test Functions - Teledyne 300E Instruction Manual

Model 300E Carbon Monoxide Analyzer
Instruction Manual
Warning
Message
SYSTEM RESET
WHEEL TEMP
WARNING

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 analyzers Theory of
Operation (see Section 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 analyzers 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.
The following table contains some of the more common causes for these values to
be out of range.
P/N 04288 REV: A
Fault Condition
The computer has
rebooted.
The filter wheel
temperature is
°
controlled at 68 ± 5 C
TROUBLESHOOTING & REPAIR PROCEDURES
Possible Causes
§ Frequency problem with the AC Mains.
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
§ Blocked Cooling Vents below GFC Assembly
§ Analyzer's Top Cover removed
§ Wheel Heater
§ Wheel Temperature Sensor
§ Relay controlling the Wheel Heater
§ Entire Relay Board
2
§ I C Bus
191