5-1
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 Visual Alarm Description
LOST No echo received from an acquired target for nine
consecutive sweeps. The target mark blinks.
TARGET FULL
(AUTO+MANU)
Relevant target memory becomes full.
ARPA alarm
GUARD Target transits the operator-set guard ring.
HD (HEAD LINE) No heading pulse to the SPU board
BP (AZIMUTH) No bearing pulse to the SPU board.
TRIG (TRIGGER) No trigger pulse to the SPU board
VIDEO No video signal to the SPU board
LOG No log signal contact closure to SPU board for one
minute
GYRO No gyro signal AD format to SPU board for one minute
Input signal
(SIGNAL
MISSING)
EPFS No L/L data from Electronic Position Fixing System to
the SPU board
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
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