Maintenance & Troubleshooting
Hardware Installation and Maintenance Manual B
–25
Symptom Response
Pressure Low Alarm or Pressure High
Alarm (Continued)
If the pressure reading is incorrect:
•Check that the
pressure/temperature cable on the
bottom of the electronics enclosure
is tight.
• Check the connector on the
pressure sensor.
• Check the pressure connector on
the backplane board.
Temp Low Alarm or Temp High Alarm
fault
Check that the actual temperature in
the sample cell is within specification
(Table A-1 on page A–1). For systems
with a heated enclosure, check that the
temperature in the sample cell is within
+/-5 C of the specified enclosure
temperature.
If the temperature reading is incorrect,
•Check that the
pressure/temperature cable on the
bottom of the electronics enclosure
is tight.
• Check the connector on the cell
temperature sensor.
• Check the temperature connector
on the backplane board.
NOTE: A temperature reading greater
than 150 °C indicates a short circuit on
the temperature sensor leads; a
reading of less than –40 °C indicates an
open circuit).
System stuck in Fit Delta Exceeds Limit
restart for greater than 30 minutes
Contact Service for information. Refer
to “Service Contact” on page B-27.
Front panel display is not lit and no
characters appear
Check for correct voltage on terminal
block input. Observe polarity on DC
powered units.
Check for correct voltage after fuses.
Check for 5 VDC on red wires, 12 VDC
on yellow wires, and 24 VDC on orange
wires from power supply.
Check connections on the display
communication and power cables.
Strange characters appear on front panel
display
Check connections on the display
communication cable.
Table B-1 Potential instrument problems and their solutions (Continued)
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