User's Manual

Table Of Contents

EX7100 Technical Manual - Module Descriptions

7.13.2 Testing and Fault Diagnosis

General

Note: Refer to Section 5 “Troubleshooting the EX7100” before reading this Section.

The module contains semi-conductor components that are

sensitive to electrostatic damage.

Electrostatic sensitive devices should only be stored and

transported inside electrically conductive static shielding

bags. Fault finding and module replacement must be

performed at “electrostatically safe work stations” where the

work bench surface, soldering iron and the operator are all

earthed to prevent the build up of harmful electrostatic

charges.

The Isolated Power Supply Module Type 2990 contains a

+100V power rail that is potentially dangerous or lethal. To

ensure personal safety, please observe caution when

operating the EX7100 terminal with the covers removed

Accessing the Line Interface Module

To gain service access to the Line Interface module:

1. Isolate the EX7100 Terminal from the incoming DC supply by removing the DC input

wires from the rear panel terminal block.

2. Remove the top cover as per Section 6.1. Keep all screws in a safe place.

Diagnosis

Check the module visually for signs of damage such as burnt tracks or components.

Check that socketed ICs are fully home. Check that all connectors are fully mated.

If no problems are apparent, apply power and follow the steps outlined in figure 7.36.