User Manual

Table Of Contents
10 Fault Finding
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10 Fault Finding
If communication has been lost with the unit at the near end of the link then there may be a
hardware fault with the wiring, network or hardware. Go to the hardware section below. If
communication with the far end of the link is lost then go to the radio section below.
10.1 Hardware
If there are problems suspected with the link hardware the following procedure is
recommended:
10.1.1 Power
Check the power LED at each end of the link. If the power lights are illuminated go to the
Ethernet section below. If at either end they are not illuminated then
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check the power
source. If neither is illuminated then there is no voltage on the power wires to the ODU.
Check that the mains power is connected and switched on.
Check that the power LED illuminates if the ODU connector is disconnected at the PIDU
Plus (open the PIDU Plus flap on the left hand side).
If it does illuminate then either the ODU is drawing too much current, or the power wiring to
the ODU is short circuit or the PSU is supplying insufficient power. The likely fault can be
determined by removing the jumper (J906), found inside the removable cover of the PIDU
Plus, and measuring the current taken with an ammeter placed across the 2 jumper pins. This
is normally 10mA without the ODU connected and 300mA to 1A when the ODU is connected.
If it does not illuminate then recheck that power is applied to the PIDU Plus by measuring the
voltage across +55V and 0V pads inside the removable cover in the PIDU Plus. Check that
the PIDU Plus is not short circuit by measuring the impedance across the Power connector. Is
the led faulty?
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The power indicator LED should be continually illuminated.