SECTION II. OPERATOR TROUBLESHOOTING
TROUBLESHOOTING BY VISUAL INSPECTION
Problem resolution concerning the VIS begins by observing the alphanumeric
display of the MCS. After initial turnon of the system, the BuiltInTest (BIT)
checks the system for faults and displays any errors. If any codes appear on the
display other than normal operating codes that do not clear when power is cycled
to OFF then to on (PROG 1, 2, or 3), unitlevel maintenance is required. The
following steps deal with other potential problems.
If during operation of the radio or radio-intercom equipment, the system
seems to lose power, make the following checks:
If the vehicle has a master switch and/or master circuit breaker, check to see
that it is turned on.
Check to see that the radio is pushed back fully on its mount and that the
mounting clamps are tightened fully.
Check to see that the power cable is connected to the MCS and the
SYSTEM switch is not in the OFF position
Communication Failures While Using VIS
When radio or intercom communication failures occur while using headsets
connected to the VIS, make the following checks:
Check to see that the headset cable connectors are locked on the VIS unit
Check to see if all cables connected to the MCS are fastened securely.
If an FFCS fails while the turret is being turned, the turret slip rings may be at
If an FFCS is inoperative, check that cabling is securely fastened between
the FFCS and the VIS units connected to both sides of the FFCS.
PROCEDURES FOR OPERATOR TO TROUBLESHOOT VIS
Accurate operator troubleshooting requires all cables to be properly
connected and all FFCS/RITs to have the correct settings.