R5 SOLID AIS SystemTROUBLESHOOTING7000 118-200, C2 Page 57 The available current is sufficient for start up and transmission The external fuse is functional The power cable is undamaged The power connector is properly connected and securedAlso check so that the LED backlight is not completely turned off in the Visual Configview accessed from Main MenuConfigDisplayVisual.7.2.2 Rx LED (yellow)The Rx LED is flashing yellow when the transponder is receiving a message from theVDL. This can be intermittently.If there is verified traffic on the VDL and the Rx LED still is dark, then check the alarmlist for any active alarms. Refer to section 7.3 for interpretation of the alarms.Lack of reception may be an indication of a VHF antenna problem or connectivityissues. Check the installation for problems.7.2.3 Tx LED (red)The Tx LED is flashing red when the transponder is transmitting a message to the VDL.The transmission interval is between 2 – 360 seconds. Refer to section 7.5.If the Tx LED is completely dark, then check so that the transmission is not switched offeither through an active regional area or by the Tx Mode parameter. It is possible tocheck the status on each transceiver in the VHF Status view described in section 4.24.If the transmission is activated and there is still no red flashing, then check the alarmlist for any active alarms. Refer to section 7.3 for interpretation of the alarms.7.3 Troubleshooting with Alarm MessagesThe R5 SOLID constantly monitors itself for failures, abnormal conditions and otherimportant parameters. Some of the monitoring trigger alarms and those alarms areexcellent aids in the troubleshooting process.An active alarm can have two states, unacknowledged or acknowledged. The state of analarm will affect the STATUS LED. Refer to section 7.2.1.A new alarm (unacknowledged) will raise a pop-up window that needs to beacknowledged by the user. The active alarms can be found in the alarm view. Refer tosection 4.18.All active alarms are outputted on all the serial interface ports every 30 seconds. Thealarm status can for example be used in interfacing ECDIS systems or centralized alarmsystems. The alarms can also be monitored or recorded for troubleshooting purposes byfor example a terminal application.The status of an alarm can be identified by two letters in the alarm sentence, “A” and “V”.The alarm sentence is constructed as: $AIALR,hhmmss.ss,xxx,A,A,c-c, where:hhmmss.ss = Time (UTC) of alarm condition changexxx = Unique alarm identifierA = Alarm condition (A = Active, V = Inactive)A = Alarm’s acknowledge state, A = acknowledged, V = unacknowledgedc-c = Alarm’s description text$AIALR,hhmmss.ss,xxx,V,A,c-c: Tx malfunction: Alarm is Inactive$AIALR,hhmmss.ss,xxx,V,V,c-c: Tx malfunction: Alarm is Inactive