System will not power on or powers on incompletely

Power supply inadequate? The system power supply should be strong enough to power the system. Check to be sure that it supplies adequate current for the instruments (see Table A‑1).

Cables tightened properly? If you are using the Multiplexer or Auxiliary Sensor Interface, press in on the 27-pin cable and tighten it. If the cable is loose it may not work properly.

NOTE: In order to achieve a weather-tight seal, the interface cable connector must be tightened until it completely covers the O-ring seal on the analyzer control unit connector. When the connector feels tight, push in and wiggle it while continuing to tighten until the O-ring is covered.

Fuse blown? Check the fuses, as described below, and replace any blown fuses.

If you are using the AC to DC power supply, start with the power supply system. Even if the power supply fuse is good, the wrong fuse can lead to power supply problems. See Using the AC-to-DC power supply and confirm that the correct fuse is installed and that it is not blown.

If you are powering the LI-8100A analyzer control unit from the battery, the power circuit has two fuses: one in the battery and one in the analyzer control unit. Troubleshoot the circuit:

  • If you are not able to charge a battery or power up the instrument from the battery, check the fuse inside the battery. See Replacing the battery fuse.
  • If the battery fuse is OK, check the fuse for battery power, which is inside the analyzer control unit. See Analyzer control unit fuses.

If you are using the LI-8150 multiplexer, the power circuit has two fuses: one in the LI-8150, and one in the analyzer control unit. Troubleshoot the circuit:

  • If neither the multiplexer nor the analyzer control unit will power on, see Multiplexer fuses and check the fuse labeled LI-8100.
  • If the multiplexer will power on but the analyzer control unit will not, check the fuse for auxiliary power, which is inside the analyzer control unit. See Analyzer control unit fuses.
  • If the multiplexer will not power on but the analyzer control unit will, see Multiplexer fuses and check the fuse labeled LI-8150.

If you are powering the LI-8100A analyzer control unit through the auxiliary sensor interface, the power circuit has two fuses: one in the auxiliary sensor interface, and one in the analyzer control unit. Troubleshoot the circuit: