9-1
9.1
FAULT FINDING
In case of semiconductor circuits, it is deemed that there are few cases in which the used
semiconductor devices have inferior quality or performance deterioration except due to
insufficient design or inspection or by other external and artificial causes. In general, the relatively
many causes are disconnection in a high-value resistor due to moisture, a defective variable
resistor and poor contact of a switch or relay.
Some troubles are caused by defective parts, imperfect adjustment (such as tuning adjustment) or
insufficient service (such as poor cable contact). It will also be effective to check and readjust
these points.
9.1.1 List of Alarms and other Indications
If any of the following alarm occurs, the system displays the alarm message in red in order to
attract the attention of operator. Other messages are displayed with the suitable color which is
yellow or blue depending on the level of message importance. For how to operate it, see Section “
2.3 FUNCTIONS OF SOFTWARE BUTTONS”.
Alarm
Red
・Collision-related Alarm
・Navigation Alarm
・System Alarm
Warning Yellow
・System Warning
Information Blue
・Operation Information
Alarm message is displayed in the lower right of the display.
This section gives the list of alarms displayed by the system and other display lists.
Table 9-1: Critical Alarm
Message Class Description ALR No.
i
CPA/TCPA Alarm There is a dangerous target. 301
i. ALR No.: Unique alarm number in ALR sentence and ACK sentence
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