Motorola PTP 400 Series Manual De Usuario

137

9 Fault

Finding

If communication has been lost with the unit at the near end of the link, 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.

9.1 Hardware

If there are problems suspected with the link hardware the following procedure is

recommended. The following diagram illustrates the main system connections.

Figure 74 - Main System Connections

9.1.1 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

check the Ethernet

LED. If neither is illuminated then there is no voltage on the power wires to the ODU.

1. Check that the mains power is connected and switched on.

2. Check that the lamp illuminates if the ODU connector is disconnected at the PTP 400

Series Bridge PIDU Plus. (Remove the PIDU Plus cover).

a. If it does illuminate then either the ODU is drawing too much current, or the power

wiring to the ODU is short circuited or the PSU is supplying insufficient power. The

likely fault can be determined by removing the jumper (J905), 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.

The power indicator LED should be continually illuminated.