Electronics International UBG-16 Installation Instructions Manual page 17

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Because high reliability is designed into Electronics International's equipment, there is no reason to put
up with poor operation. We have few problems with our probes, cables and units and installation is
simple. Usually fixing a problem is just a matter of inspecting the installation at a few key points.
Strategy Strategy Strategy Strategy Strategy
If you have more than one problem, FIX ONE PROBLEM AT A TIME
them at once can be confusing and misleading. In many cases fixing one problem first will lead you
to the solution for fixing all of the problems. Therefore, take one problem on one channel and
proceed with the following:
A. A. A. A. A. Instrument Check Out Instrument Check Out
Instrument Check Out Instrument Check Out Instrument Check Out
If there is an identical symptom on each channel, then the instrument may have a problem. But if
even one channel of the instrument is operating properly, the instrument probably does not have a
problem. A good method to test the instrument is to remove all the Extension Cables by discon-
necting the Extension Cable Circular Connector. Then look for a reading on all channels to be
near cabin temperature for temperature channels or zero for channels measuring functions other
than temperature (RPM, Oil Pressure, etc.). The only inputs the UBG requires to operate prop-
erly and measure cabin temperature is power (red lead) and ground (black lead). Check the
power and ground leads for proper connection (pull on the wire at each connector).
Note: Few problems turn out to be the instrument. Note: Note:
Note: Note:
B. B. B. B. B. Probe Check Out Probe Check Out
Probe Check Out Probe Check Out Probe Check Out
There are two good methods of testing a probe. Perform one or both of the following:
1. 1. 1. 1. 1. A probe can be tested with an ohmmeter. Disconnect the probe from the Extension Cable.
When testing the resistance between the connectors, the probe should measure a "short" (less
than 5 ohms). When measuring from one lead (either lead) of the probe to the probe sheath
(metal tip), there should be an "open" (10k or greater).
2. 2. 2. 2. 2. Another method of checking a probe is to plug the suspected bad probe into a channel that is
working properly. If the problem follows the probe, you have a defective probe.
C. C. C. C. C. Extension Cable Check Out Extension Cable Check Out Extension Cable Check Out
Extension Cable Check Out Extension Cable Check Out
With the Extension Cable connected to the UBG, remove the probe from the suspected bad Exten-
sion Cable. Set the UBG to the proper channel and look for a near cabin temperature reading. A
very high or low reading indicates a short to ground in the cable. Next, connect an ohmmeter, set
OUBLESHOOTING SUGGESTIONS OUBLESHOO OUBLESHOO
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FIX ONE PROBLEM AT A TIME. . . . . Trying to fix all of FIX ONE PROBLEM AT A TIME FIX ONE PROBLEM AT A TIME FIX ONE PROBLEM AT A TIME
TING SUGGESTIONS TING SUGGESTIONS TING SUGGESTIONS
TING SUGGESTIONS
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