User's Manual

Table Of Contents

EX7100 Technical Manual - Module Descriptions

7.11.2 Testing and Fault Diagnosis

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 Modem/Controller module contains a lithium battery.

There is a danger of explosion if the battery is incorrectly

replaced. Replace only with the same or equivalent type

recommended by the manufacturer.

Dispose of used batteries according to the manufacturers

instructions.

General

The Modem/Controller module is very complex and interacts with all of the other modules

and control systems within the EX7100 terminal.

For this reason, a faulty Modem/Controller module may cause symptoms that appear

elsewhere, and faults elsewhere may cause symptoms to appear at the

Modem/Controller module.

Accessing the Modem/Controller

To gain service access to the Modem/Controller module, remove the top cover as per

Section 6.1.

Diagnosis

Under normal operating conditions and with a link established, D8, D100, D101 and D102

should all be on. If this is not the case, follow the instructions below:

With the unit de-powered, check the Modem/Controller module visually for signs of

damage such as burnt tracks or components. Check that all connectors are fully mated

and that all socketed ICs are fully inserted.

If no damage is apparent, attach the antenna and power leads. Follow the steps in Figure

7.30 overleaf.