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Chapter 5 AN100U/UX Troubleshooting
Redline Communications Inc. Confidential and Proprietary
DC Powered Devices
If the unit is DC powered, then there is no power switch on the device. Once the D/C power
cord is connected and power is available, the device should start its boot procedure
immediately.
Step 1
If your DC powered device does not start as expected, check the power cord, as indicated
above for the AC devices.
Step 2
A common issue with the D/C powered devices is that the black and blue wires are
connected incorrectly to the power source. This results in a reversal of polarity. If this is
the case the unit will not power on, and will, hopefully not be permanently damaged.
RedMAX equipment contains a diode-protection circuit built into the power sub-system
that should prevent permanent damage.
In the specific case of the AN100U/UX, to properly connect these wires to the power
source, you need to understand that the DC power input is floating. This allows for positive,
negative or floating power connections. A floating power connection is a power-supply that
has no direct connection to a local ground reference:
•
When connected to a DC power supply providing negative D/C voltage, the black cable
should be connected to the power return, and the blue cable to the negative voltage.
•
When connected to a DC power supply providing positive D/C power, the black cable
should be connected to the positive voltage, and the blue cable to the power return.
In other words, the black cable should always be connected to the point of the higher
potential.
Step 3
If the DC power cord is properly connected to the power source, and the unit still does not
start, you need to verify the maximum amount of current that your power source can
deliver.
The AN100U/UX can draw up to 4 A of rush-in current. Rush-in current is required during
the first half-second while the unit is powering up and it depends on the voltage provided
by the power source. The higher the voltage, the lower the rush-in current that is required.
Step 4
Both of the AC and DC versions of the AN100U/UX have a fuse in each of their power
supply units which protects the system from current overloads.
After eliminating the above-listed sources of failure, you need to verify that these fuses are
intact and if not replace them as necessary. If these fuses have been blown, then you will
need to determine the cause.
Step 5
Verify that the AN100U/UX IDU is connected to the correct connector on the ODU. Both
the IF and RF ports on the AN100U/UX radio are female N-type, so it is possible to connect
the IF cable to the RF port or vice versa.
If you connect the ODU RF port to the IF cable and port on the IDU, the IDU will not power
up. There is a component in the transmission line, at the entrance of the RF port that
protects the radio from a power surge. When the IDU is connected to the RF port, this
transmission line (cable) acts as a short, causing the IDU power supply to enter its own
protected mode, since the 24 V power supply is now essentially connected to ground.
