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Troubleshooting Guide
This guide will concentrate on all relevant troubleshooting issues above simple cable connection faults. Therefore, the
cables between the NDC-4 hardware and any other devices should be checked as a matter of course, before continuing
with this guide.
Diagnostic LED
The NDC-4 hardware supports a tricolour diagnostic LED that indicates the current operating mode of the hardware, or
if an error has been detected during the self-test initiation process.
‘Table 1’
details what each LED colour represents
and if any user interaction is required.
LED Colour /
Flash Count
Mode / Error condition
Required User Response
Start up operation modes
The sequence below indicates a successful power-up of the
NDC-4 with no data on any of the input channels.
LED is off
Power down mode
The NDC-4 has no power, confirm the battery is connected
correctly. For USB powered units, ensure the cable is
connected and the USB drivers are installed.
Red,
No flashing
Start-up mode,
No error
No response required. A normal operation mode that should
last for no more than 1.5 seconds. Any longer indicates an
error with the main program.
Amber,
No flashing
Initialise and self-test mode,
No error
No response required. A normal operation mode that follows
after the Start-up mode and should last for approximately 1
second.
Green,
No flashing
Normal and no data mode,
No error
No response required. A normal operation mode that follows
the Initialise and self-test mode. Indicates that no error was
detected during the self-test operation.
Also indicates that no data is currently being received by the
NDC-4 hardware.
Running modes
Below are the other correct operating modes possible with the
NDC-4.
Green,
Flashing (1-10 per
second)
Normal and data Rx mode,
No error
No response required. A normal operation mode that indicates
that data is currently being received (on at least one channel)
by the NDC-4 hardware. Flash rate proportional to Rx rate.
Red,
No flashing
Flash updating mode,
No error
No response required. LED will stay red for the duration of the
flash update operation (using Actipatch). Once operation
complete, NDC-4 hardware will be automatically reset.
Error mode
Below is a possible error mode for the NDC-4. If the error
“Returns Procedure” on page 20
Amber,
Flashing (Once
every 4 seconds)
Error trap mode,
EEPROM memory error
An error with the EEPROM memory has been detected during
the self-test mode.
Reset the NDC-4 hardware.
Table 1 – Diagnostic LED Colours
Summary of Contents for NDC-4
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