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6. MAINTENANCE & TROUBLESHOOTING
6-7
Interference rejector
is not working (inter-
ference rejection
level not displayed)
1) SPU Board 1) Replace SPU Board.
Echo stretch is not
working (Neither
ES1, ES2 or ES3 is
displayed)
1) SPU Board 1) Replace SPU Board.
Range rings are not
displayed
1) Adjust their brilliance on the
Brill/Color menu.
2) SPU Board
1) Replace associated circuit board if unsuc-
cessful.
2) Replace SPU Board.
Poor discrimination in
range
Sea clutter control not func-
tioning properly
Try to adjust A/C SEA control.
True motion presen-
tation not working
properly
1) Poor contact of MODE key.
2) TM display accurate
1) Try to press the key a little harder.
2) Make sure that position and heading
inputs are accurate.
Target not tracked
correctly
Poor definition of targets in sea
clutter
Adjust A/C SEA and A/C RAIN controls.
Advanced-level troubleshooting
Problem
Probable cause or
check points
Remedy