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Troubleshooting
1) Wait at least 1-minute and see if the Display Unit starts up. Sometimes the Power LED
on the Display Unit fails but the Display Unit is otherwise OK. If the application starts but
the LED on the Display Unit does not turn on, test the operation of the LED using
the System Test > Keypad test under Tools
(Section
).
2) Test the battery
a) Check that the fuse, inside the battery case, has not blown. If so, replace the 10 Amp
fuse with one of the spare fuses inside the battery case.
b) Use a multimeter with fine tipped probes (1mm or 0.04 inches) to measure the battery
voltage at the connector on the outside of the battery case. Measure the voltage between
socket #1 (ground, using the black probe) and socket #4 (power, using the red probe). If
the voltage is less than 10.5 volts, there is a problem with the battery.
3) Test the Battery Cable
Insert the battery cable into the battery and test the battery cable. Use a multimeter to
measure the battery voltage at the connector at the end of the battery cable. Measure the
voltage between socket #1 (ground, using the black probe) and socket #4 (power, using
the red probe). If the voltage is less than 10.5 volts, there is a problem with the battery
cable.
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