INSIGHT STRIKE FINDER Pilot's Manual page 56

STRIKE FINDER
Z - Slow Flashing
This error code can result from loss of +8V or -8V supply, or ground to the
sensor. Also, loss of the test pulse signal to the sensor, or sensor
malfunction will produce this error code.
Check for the presence of +8V and -8V at the sensor 9 pin connector.
Check sensor cable/connector wiring for conductors +8V, -8V, GND, and
TG.
Exchange display and sensor with known good components.
S - Continuous
Separation failure in test pulse hardware.
Return display to Insight for repair.
B - Continuous
Non-volatile memory failure.
Return display to Insight for repair.
Other Symptoms
Mirror Imaging
Symptom: Display plots a real storm cell at the proper location, as well as
a 'mirror image', or ambiguous cell located 180-degrees away. Usually the
'mirror image' cell has fewer dots. This condition may be accompanied by
an intermittent P error message.
For troubleshooting, see 'P-Intermittently Displayed', above.
PILOT'S GUIDE
DIGITAL WEATHER AVOIDANCE
55