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5.1 Outline
This chapter provides troubleshooting flow charts and describes error messages.
5.2 Error Message
When no bearing pulse signal is input to the display unit, BP-SIG-MISS is indicated, and when no
heading signal, HD-SIG-MISS. Check the antenna cable when those indications appear.
Visual Alarms
Visual alarms appear on the display to alert the operator that the system is abnormal. The name and
meaning of each visual alarm is tabulated below.
Alarm Type
ARPA alarm
LOST
TARGET FULL
(AUTO+MANU)
GUARD
Input signal
HEAD LINE
(SIGNAL
AZIMUTH
MISSING)
TRIGGER
VIDEO
LOG
GYRO
EPFS
5.3 Troubleshooting Flow Charts
The troubleshooting flow charts help the service technician to diagnose a problem. To use the flow charts,
first find symptom and its flow chart number in the flow chart on the next page. Then, follow appropriate
flow chart to troubleshoot.
Chapter 5. TROUBLESHOOTING
Visual Alarm
Description
No echo received from an acquired target for nine
consecutive sweeps. The target mark blinks.
Relevant target memory becomes full.
Target transits the operator-set guard ring.
No heading pulse to the SPU board
No bearing pulse to the SPU board.
No trigger pulse to the SPU board
No video signal to the SPU board
No log signal contact closure to SPU board for one
minute
No gyro signal AD format to SPU board for one minute
No L/L data from Electronic Position Fixing System to
the SPU board
5-1
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