Chapter 8 MDC-1840BB/1841BB/1860BB/1810BB/1820BB Series
Trouble Shooting And On Board Servicing Operation Manual
8-2 93142122-07
(Alarm messages)
Alarm messages Faults detected
RADAR VIDEO ABNORMAL Video signal sent from the transceiver unit is
erratic or not present at all.
GYRO HDG XXX No bearing data is applied to the display unit.
LOG SPD XXX No bearing data is applied to the display unit
8.2.2 Status indicators
Two LEDs (Light Emitting Diodes) are provided on the Logic board fitted inside the
display unit. These LEDs indicate the operational status of the software and hardware
used in this system. Details of the indications are as follows:
Table 8.2 Status indications
LED No. Usage Operational status LED status
DS1 Software check Normal ON
Failure OFF
DS2 Hardware check Normal ON
Failure OFF
Location of the status indicators
Figure 8.1 Location of status indicators
U18
U25
U21
U37
DS2
DS1
LOGIC BOARD
E47-700A
Status indicators
U57
Line Filter
Battery
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