Nortel Networks DCT1900 Maintenance Philosophy, Concept of Maintenance, Preventive Maintenance

Technical Product Manual - DCT1900

Maintenance, Maintenance Philosophy

CHAPTER 1

Maintenance Philosophy

1.1Concept of Maintenance

The DCT1900 maintenance philosophy is to undertake component repair and replacement at the Ascom Wireless Solutions Repair Department. Site maintenance is therefore limited to module replacement only. These modules are easily replaceable elements, like System Boards, Base Stations, fuses, Portable Telephones, desk chargers, etc.

The main purpose of this section is to describe how a malfunctioning system’s faulty modules can be found and replaced, i.e. corrective maintenance. Furthermore, background information is given about the system’s internal diagnostic–and–test facilities to indicate the reliability and functionality of the Test and Maintenance software (see Chapter 2).

Qualified Personnel

Since maintenance is strictly reserved to qualified installation and maintenance engineers ONLY, persons who have not received instructions for accessing the equipment are not allowed to access the DCT1900 system. Any such actions will be considered as unauthorized access. Authorized access is restricted to engineers who are properly trained and certified by authorized DCT1900 system trainers.

1.2Preventive Maintenance

Although preventive maintenance is not applicable to the DCT1900 systems, some words may be said about it:

Wiring

Accurate and secure installation of wires may prevent any future wiring failures, loose contacts, etc.

Safety Requirements

Whenever the system is being accessed, all ESD precautions must be taken. Do not touch boards without having yourself connected to the ground by a wrist–strap.

Read Chapter 3, "Protection against Electrostatic Discharge" in Section 1, "Safety and Regulatory Information" in this manual.

End–user Guidance

End–users and customers should be fully aware of all DCT1900 features and the functionalities/ features of the Portable Telephone. Informing end–users of how to operate the Portable Telephone and advising them to read the Portable Telephone User’s Guide may prevent many initial complaints.

Configuration Back–up on Floppy

Whenever something has changed to the system configuration (especially when passwords have been changed), a back–up of these changes should be made on a diskette using the "Save Configuration" function of the CSMW.

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