Fault Diagnosis With Dashboard Functions; Table 8-2. Dashboard Functions (Tags) - Indicated Failures - Teledyne T750 User Manual

MESSAGE
Photo Reference
Warning
Rear Board Not Det
Regulator Pressure
Warning
Relay Board Warning
System Reset
F D
AULT
In addition to being useful predictive diagnostic tools, the functions viewable from the
Dashboard menu can be used to isolate and identify many operational problems when
combined with a thorough understanding of the calibrator's Theory of Operation (see
Section 9).
The acceptable ranges for these 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.
Table 8-2 contains some of the more common causes for these values to be out of range.

Table 8-2. Dashboard Functions (Tags) - Indicated Failures

FUNCTION
Gas flow problems directly affect the concentration accuracy of the O
This number is computed using data from the calibrator's
Output Flow
- Check for Gas Flow problems.
- Check the pressure regulator
Check the O
O3 Gen Drive
Possible causes of faults are the same as O3 GEN LAMP TEMP WARNING from Table 8-1
Incorrect Lamp temperature can affect the efficiency and durability of the O
lamp.
O3 Gen Lamp Temp
Possible causes of faults are the same as O3 GEN LAMP TEMP WARNING from Table 8-1
Regulator Pressure Same as REGULATOR PRESSURE WARNING from Table 8-1
083730750B DCN8606
FAULT CONDITION
Occurs when Ref is
<2500 mVDC
or >4950 mVDC.
Motherboard not detected on
power up.
Regulator pressure is
<15 PSIG or >25 PSIG
The CPU cannot communicate
with the Relay Board (power
distribution board).
The computer has rebooted.
W D
IAGNOSIS ITH ASHBOARD
DIAGNOSTIC RELEVANCE AND CAUSES OF FAULT CONDITIONS.
generator heater and temperature sensors
3
POSSIBLE CAUSES
Possible failure of:
- UV Lamp
- UV Photo-Detector Preamp
- THIS WARNING only appears on Serial I/O COM Port(s)
Input and Control Panel Display will be frozen, blank or
will not respond.
- Failure of Motherboard
- Zero or source air supply is incorrectly set up or improperly
vented.
- Incorrectly adjusted O
zero air pressure regulator
3
- Leak or blockage exists in the T750's internal pneumatics
- Failed O
Generator Input pressure sensor
3
- I C Bus failure
2
- Failed power distribution board
- Loose connectors/wiring
- 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
F
UNCTIONS
3
calibration gases.
generators UV
3
135