T
-900 series Chapter 4 Maintenance
0093142132-00
4-5
4.4.4
Inspection at Each Location
After finishing the inspection by the self-diagnosis, according to the table, check each location of the
radar.
Trouble conditions
Suspected causes of troubles
Countermeasures
The power cable is not connected. Connect the power cable and fix the
connector firmly.
The power voltage is out of the
specified range.
Use the appropriate power.
The radar cannot be
powered.
The main power fuse blew out.
Replace the fuse with a new one.
The screen brightness adjustment
is set to the minimal value.
Adjust the brightness with the [BRILL]
key.
Defect of the LCD unit
Request the repair.
The radar can be
powered. But,
nothing is displayed
on the screen.
Defect of the LCD drive circuit
Request the repair.
The screen brightness adjustment
is not properly performed
Adjust the brightness with the [BRILL]
key.
The screen is dark.
Defect of the backlight
Request the repair.
The mutual connection cable is
not connected.
Connect correctly the mutual
connection cable.
Detuned.
Re-adjust.
Refer to Tune Select in 3.3 setting
of Adjustment Items.
The character
information can be
displayed. But, the
image of the radar
cannot be displayed.
Defect of the transmission
equipment
Request the repair.
The heading is not correctly set.
Set the heading.
Refer to Bearing Setting in 3.3
Setting of Adjustment Items.
The target image is
different from the
actual one.
The distance adjustment is not
properly set.
Set correctly the TX delay adjustment.
Refer to TX Delay in 3.3 Setting of
Adjustment Items.
The set value of the gain is low.
Rotate clockwise the [GAIN] knob to
display an image.
The setting defect of STC or FTC.
Re-adjust.
Refer to 1.8 STC Adjustment or
2.2 FTC Adjustment.
Detuned. Re-adjust.
Refer to Tune Select in 3.3 Setting
of Adjustment Items.
The image is weak.
Defect of the magnetron or MIC
(front end)
Request the repair.
Detuned. Re-adjust.
Refer to Tune Select in 3.3 Setting
of Adjustment Items.
Too much noise
The radar is not grounded.
Connect the ground wire.
The power is not fed to the motor. Check the connection of the motor
power.
The antenna does
not rotate.
The motor brush is worn.
Replace the motor brush with a new
one.
