Nortel Networks DCT1900 - Manual (Page 349)

Technical Product Manual - DCT1900
Maintenance, Maintenance Philosophy
Maint-DCT1900/R8/mw 1-1
© 2000-2005
C HAPTER 1
Maintenance Philosophy
1.1 Concept 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.
1.2 Preventive 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.