ADVANCED FEATURES
USING DIAGNOSTIC
Reset. With the many User Options available to 
customize the 250DX, it is easy to configure the unit 
in such a way that it is detrimental to a particular 
use. By using the Reset function, all variable or user- 
controlled features (except Filter) of the 250DX are 
returned to the factory settings.
The Reset function is an important first step in troubleshooting problems to ensure that a user selected setting is not the cause for the perceived problem.
USING THE DIAGNOSTIC FEATURE
The 250DX contains a powerful diagnostic tool that can aid in determining the cause of a problem.
To use the Diagnostic feature, select the Diagnostic feature on the
Self Test. Initially, the 250DX will perform a 
This test confirms the operation of all internal circuitry. 
At the conclusion of the test, one of two messages will 
appear. PASSED indicates the internal test discovered 
no failures, FAILED indicates a significant internal 
problem was discovered and the unit requires factory 
service. A code number appears that tells repair 
personnel where the problem is.
Transducer Connection. The first connection tested is 
Transducer input. If a transducer is detected, the 
message CONNECTED appears. If a series of dashed 
lines is shown, no transducer is connected or there is 
a problem with the transducer or cable.
If you are using multiple transducers, switch between transducers to confirm the connections for each.
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