Codan NGT 2010 RF Technical & Service Manual page 673

Figure 9: NRI fault diagnosis chart
NGT Transceiver System Technical Service Manual
NRI fault diagnosis
chart
not
What is the
green
status of the LED
on the front panel
of the NRI?
Off
Is the power
supply connected to
the NRI and
switched on?
Yes
Check for power
between TP101 and
GND on the NRI
User Connect PCB.
Is the voltage
+13.5 V nominal?
(10.5 to 15 V
allowable)
Yes
Power supply OK.
Is the
LED on the
front panel of the
NRI flashing a
colour other
than green?
Yes
Test the NRI
Microcontroller PCB.
flashing
green
Connect the power
No
supply and switch
on the power.
No
Power supply may
Fault find the
power supply.
No
NRI—Fault finding
be faulty.
NRI OK.
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