IV Pole12vdc IV Pole Extends
Input Device Output
Troubleshooting Overview
Troubleshooting the Neptune Ultra system is accomplished by using the half split
method. The half split or half split bracketing method of troubleshooting divides the
suspected faulty circuitry in half, and begins the diagnosis in the center. If the input is
good and the output is bad, then the device is considered faulty and should be replaced.
Note that if the device is an end item (such as an IV pole) the output may be an
operation. As a troubleshooting aid, we will walk through an example of a faulty IV Pole.
The illustrations and troubleshooting steps to follow serve as a guideline for the
technician on how logical troubleshooting checks should be made based on the
information in this chapter. The technician should use a combination of the block
diagrams and the troubleshooting chart immediately following the troubleshooting
example to determine failures in each subsystem.
Figure 1: IV Pole Normal Operation
In the case of the IV Pole, the input is 12VDC and the output, or desired
operation, is to extend the belt driven pole via the motor. Figure 1 illustrates this
example. If the pole does not extend there are several possible causes. As stated
earlier, the 12 volt input is required in order for the pole to extend. If the input is present
and the IV Pole still does not work, then the IV pole assembly will be replaced. In some
cases only the motor will be replaced but most of the time when replacing parts, the
technician will not replace items on a component level. Instead, entire modules or circuit
boards will be replaced. This is intended to facilitate troubleshooting and increase the
reliability of the system.
However, if the technician finds that the 12 volt input is not present, then they
should follow the path of troubleshooting towards the source. Most often, schematics or
block diagrams show a circuit flow drawn from left to right. For this reason, the half split
method usually uses the “good right, bad left” terminology to direct the technician back
to the source.
5-1
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