Codan NGT 2010 RF Technical & Service Manual page 671

Test procedures
CAUTION
It is recommended that the NRI be tested in the following order:
•
•
•
•
•
Testing the switchmode power supply
To test the switchmode power supply:
1
1
Figure 8: Power supply fault diagnosis chart
Power supply fault
Measure the voltage
terminals of the power
supply present at the
Power supply may
need replacement
NGT Transceiver System Technical Service Manual
To avoid port failure, field service technicians using the Test connector of
the NRI during NRI testing or debugging should run laptops from the
internal battery instead of using the mains supply.
the switchmode power supply where applicable
the NRI as a stand-alone unit
the NRI Microcontroller PCB
the NRI Vocoder PCB
the NRI User Connect PCB
Connect the switchmode power supply to a mains supply and switch it on.
Follow the steps in Figure 8
diagnosis chart
output.
Is voltage
Yes
+13.5 V?
(10.5 to 15 V
is allowable)
No
or repair.
Refer to Codan.
to assist in fault finding.
Fault find the NRI
User Connect
PCB.
NRI—Fault finding
277