9B63 B
 The GMDSS operator has been unable to use the satellite communication system because it has a video display monitor that does not work. A substitute monitor is not available. What action(s) might be appropriate to localize the problem?
A. Spray non-lubricating contact cleaner on each switch and connector while observing the monitor.
B. Use an oscilloscope to verify that there is a video signal.
C. Resolder each connector of the video cable while observing the monitor.
D. Perform a complete alignment of the video monitor inaccordance with the manufacturer's specifications.
