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System Mai ntenance
System Maintenance
General Information
Maintaining the
changes, facilities and apparatus moves, adds and changes. These requirements are
handled properly by practicing the techniques, illustrations and step-by-step instructions
listed in the previous sections of this manual.
Cleaning
When installed properly the
time the digital telephone instruments may become dirty or dusty and require cleaning.
We suggest the use of a clean, dry cotton (or other soft, absorbent) cloth to wipe the
instrument clean. Use of chemicals to clean the telephone plastics is NOT recommended
since some chemicals can cause permanent damage to the telephone finish. If deep
soiling conditions exist for the telephone to be cleaned, use of specialized telephony
cleaning solutions may give satisfactory results. When trying any cleaner for the first time
we suggest that it be applied to the telephone instrument underside in a small sample
area to assure that the desired results are obtained before proceeding.
Failures
Problems such as system restarts (from temporary AC power interruption), fading (from
the long distance carrier), or dropped calls (caused by internal user randomly pressing
holding CO Line buttons) all are common situations that are not the result of a system
component or software failure.
The System Troubleshooting section attempts to provide the service technician with
some quick, and reliable, tools to diagnose installation related or service related problem
reports.
KSU
Component failures at the KSU are limited to power distribution (fuses), improper or
shorted wiring, CO or station interface failure, or auxiliary circuit problems.
Power/CPU LED
The power supply, PSU, AC switch will light red when AC power is present and the AC
switch is on. The power supply CD LED will be lit when DC power is on.
The MPB heartbeat LED is located at the top of the MPB module. When the CPU is
running and is not locked up or failed, the LED will be flashing at a rapid rate. The
initialization switch is located inside the MPB module just below the battery and must be
set to ON before powering up the system.
DHS-L
digital telephone system is a combination of customer database
DHS-L
performs relatively maintenance-free. From time to
Chapter 6 - Maintenance /Troubleshooting
6-3
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