Specifications

DX-80 INSTALLATION AND MAINTENANCE MANUAL
P7290 IMM 4-1
4. Maintenance and Trouble Shooting
User 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 installed properly the Comdial DX-80 performs 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. 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 appropriate results are obtained before proceeding.
Technical Problem Solving
The System trouble shooting procedures are a logical approach to fault identification, analysis, and correction. The
DX-80 may generate symptoms of problems that actually occur outside of the office environment. 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.
The System trouble shooting section attempts to provide the service technician with some quick, and reliable, tools
to diagnose installation related or service related problem reports.
Symptom(s) Diagnostic Aid Cause(s) Action
No AC input 1. Check commercial AC outlet.
2. Verify that both ends of AC cord are plugged in.
Power Switch Switch the KSU AC power switch to the “ON”
position.
AC Fuse 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).
No system operation.
No LED or LCD operation
Digital Executive
Telephones.
No dial tone at IST’s.
CPU Heartbeat
LED Dark
DC Fuse 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).