Maintenance; Introduction; External Inspection; Routine Maintenance - Optical Systems Design OSD151 Manual

3. MAINTENANCE

3.1 INTRODUCTION

The following section outlines the fault-finding procedure for the OSD151 modem. Please take note of
the following:
Personnel without appropriate training should not attempt any maintenance except that outlined
below.
If further maintenance is attempted you are warned that every care should be taken to ensure that
internal measurements made while the equipment is operational are taken carefully as some
components within the unit are expensive and may be damaged by failure of any portion of their
support circuitry.
Some components within the unit are electrostatic sensitive and ESD precautions should be taken
when performing maintenance upon the unit.

3.2 EXTERNAL INSPECTION

Visually check for the following:
Ensure that the correct power source (ie +12V DC) is connected to pin 9 of the D connector or to
the power socket.
Ensure that the RS422 signal is connected to the modem correctly and that the distant OSD151
modem has been terminated correctly to any external equipment.
Inspect the optical connectors for any contamination and clean using isopropyl alcohol and a lint
free tissue if any contamination is detected.
Ensure that the toggle switch is set for the correct mode of operation.
If synchronous operation is selected check that the system is generating correctly phased clock
signals and that it accepts the phasing of received clock signals with respect to the received data
signal. Refer to FIGURE 5 for the correct phasing.
Check that any external termination resistors are connected if the system configuration requires
them in.

3.3 ROUTINE MAINTENANCE

There is no routine maintenance required with the OSD151.
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OPTICAL SYSTEMS DESIGN
OSD151 OPERATOR MANUAL
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