User's Manual

JMA-9172-SA Instruction Manual > 9.TROUBLE SHOOTING AND AFTER-SALES SERVICE > 9.1 FAULT FINDING
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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.
Alarm message is displayed in the lower right of the display. For more details
refer to page2-31 Alarm.
This section gives the list of alarms displayed by the system and other display
lists.
Alarm: Red
• Collision-related Alarm
• Navigation Alarm
• System Alarm
Warning: Yellow
• System Warning
Infomation: Blue
• Operation Information
Table9-1： Critical Alarm
Message Class Description
ALR No.
i
i. ALR No.: Unique alarm number in ALR sentence and ACK sentence
CPA/TCPA Alarm There is a dangerous target. 301