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5.2.1 Troubleshooting a blank LCD screen
When the LCD is blank, this means that the unit has entered S mode. This
indicates that the battery voltage has dropped below 10.9 VDC.
5.2.1.1
1) Make a local connection with the G4 EX. This will wake the unit up so that
2) Check the power supply cable. It must make a good, secure electrical
3) If voltage is low, investigate power supply source.
5.2.2 Troubleshooting a Low Lithium alarm (LL)
When the Low Lithium alarm displays, the lithium battery should be replaced
immediately. Failure to replace the lithium battery could result in a loss of data
following a power loss. Instructions for replacing the lithium battery can be found
in Chapter 4.
5.2.3 Troubleshooting an Analog to Digital Failure alarm (AD)
The G4 EX must have a Measurement Tube application running to receive this
error. If the A to D Failure alarm is present or if the device is in Sleep mode but is
still receiving minimum voltage, it may be necessary to test the data link between
the main electronic board and the transducer. Use the following instructions to
check the transducer.
Probable causes of receiving the A to D failure include:
Page 5–4
Step-by-step instructions
the user can check all alarm conditions and determine the problem.
connection with the connector, J16 (see Figure 5–3).
Figure 5–3 Power supply – G4 EX termination board
2104349 rev. AD
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Table of Contents
Troubleshooting
