3. MAINTENANCE, TROUBLESHOOTING
3-5
Table 3-3 Advanced troubleshooting (con’t.)
Problem
Check point
Remedy
STBY TX pressed to transmit but…
antenna does not
rotate
•
On the Installation Setup 1
menu, confirm that “Ant on Tx”
is set to “Rotate.”
•
Antenna drive gears.
•
Antenna motor power circuit.
•
Antenna motor B801.
Sensitivity adjusted with A/C RAIN and A/C SEA off but…
neither noise nor
targets appear
(indications do)
•
IF AMP board.
•
Antenna cable.
•
SPU board.
neither
indications nor
markers appear
(noise and
targets do)
•
SPU board.
•
Short in trigger line of signal
cable.
•
Measure magnetron heater
voltage.
•
Modulator circuit.
How to measure magnetron heater
voltage:
1. Turn on the radar and leave it in
stand-by.
2. Open the antenna cover.
3. Unfasten screws to remove the RTB
cover.
4. Connect a multimeter, set to 10 VDC
range, between test point J825#4
and J825#6 (GND) on the RTB Board
(03P9249).
5. Confirm the meter reads 7.6 V
±
0.1V.
6. Close the RTB cover.
7. Close the antenna cover and tighten
the cover fixing screws.
sweep is not
synchronized
with antenna
rotation
•
Bearing pulse generator circuit
in antenna unit.
•
SPU board.
sensitivity is poor
•
Measure magnetron voltage as
prescribed above.
•
MIC may have detuned.
Key is pressed but…
no response
•
Keyboard may be faulty.
•
SPU board.
Содержание FR-7041R-MARK-2
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