Chapter 3. Maintenance And Trouble Shooting; System Maintenance; Technical Problem Solving - Comdial DX-80 Technical Manual

3. MAINTENANCE AND TROUBLE SHOOTING

3.1 System Maintenance

Maintaining the Comdial DX-80 digital telephone system is a combination of customer database
changes, facilities and apparatus moves, adds and changes. These requirements are accomplished by
practicing the techniques, illustrations and step-by-step instructions listed in the previous sections of
this manual.
When properly installed, the Comdial DX-80 is relatively maintenance-free. From time to 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. The 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, many specialized telephone cleaning solutions
will provide satisfactory results. When trying any cleaner for the first time, apply the cleaner to a
small sample area on the underside of the instrument. If the expected results are achieved, proceed
with cleaning the remainder of the telephone.

3.2 Technical Problem Solving

The system trouble shooting procedures are a logical approach to fault identification, analysis, and cor-
rection. The DX-80 may generate symptoms of problems that actually occur outside of the office envi-
ronment. Problems such as system restarts (from temporary AC power interruption), fading (from the
long distance carrier), or dropped calls (caused by internal users randomly pressing holding CO line
buttons) all are common situations that are not the result of a system component or software failure.
This section attempts to provide you with some quick, and reliable, tools to diagnose service-related
problem reports. For installation-related problems, see Section 4, Troubleshooting Installation Issues.
Symptom(s)
No system CPU Heartbeat
operation. LED Dark
No LED or LCD
operation Digital
Executive
Telephones.
No dial tone at IST's.
October, '03
Diagnostic Cause(s)
Aid
No AC input
Power Switch
AC Fuse
DC Fuse
Comdial
DX-80 Installation & Maintenance
Action
1. Check commercial AC outlet.
2. Verify that both ends of AC cord are
plugged in.
Switch the KSU AC power switch to the "ON"
position.
Switch KSU power to the OFF position and
remove cover (four screws). Locate the system
power supply in the upper left corner of the
KSU interior and inspect the AC fuse for
continuity (DVM required).
Switch KSU power to the OFF position and
remove cover (four screws). Locate the system
power supply in the upper left corner of the
KSU interior and inspect the DC fuse for
continuity (DVM required).
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