Here are some example faults
880 has RS 232 troubleshooting port out of the RT base.
Roll Cal proceedure
To exit force standby , STAB button 4 times in 3 seconds. Remember a 870 is different, some combination of push and hold 3 buttons.
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Pilot Event Marker
(1) A pilot event marker is created by operating the switch on the GAIN control for two
cycles (pull out, push in, pull out, push in). A full set of parameters at that instant is
stored in the fault log. This can be useful if the pilot senses that there may be
something abnormal with the radar operation, but no fault code is being shown. This
data must be read using the RS–232 port.