Vertical comdial DX-120, Руководство по установке и обслуживанию

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T
ECHNICAL
P
ROBLEM
S
OLUTIONS
DX-120 Installation and Maintenance Manual
- 76 -
Technical Problem Solutions (continued)
Diagnostic Quick Reference
This section attempts to provide you with some quick, and reliable, tools to diagnose service-related problem
reports. For installation-related problems, see “Troubleshooting Installation ISSUES”.
Diagnostic Quick Reference Chart
Symptom(s) Diagnostic Aid Cause(s) Action
No system
operation.
No LED or LCD
operation Digital
Executive
Telephones.
No dial tone at
IST’s.
CPU Heartbeat
LED Dark 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 1) Switch KSU power to the OFF position and
remove cover (four screws).
2) Locate the system power supply in the upper
left corner of the KSU interior and inspect the
AC fuse for continuity (DVM required).
DC Fuse 1) Switch KSU power to the OFF position and
remove cover (four screws).
2) Locate the system power supply in the upper
left corner of the KSU interior and inspect the
DC fuse for continuity (DVM required).
No system
operation. CPU Heartbeat
LED Dark or Lit
steady Memory strap in
“
Cold Start ” position
If the memory strap is in the “Cold Start”
position:
Initialize the system as described in
“Power-up Ini-
tialization (Cold Start)” on page 72
.
Power Switch Switch the KSU AC power switch on the “ ON ”
position.
AC Fuse 1) Switch KSU power to the OFF position and
remove cover (four screws).
2) Locate the system power supply in the upper
left corner of the KSU interior and inspect the
AC fuse for continuity (DVM required).
DC Fuse 1) Switch KSU power to the OFF position and
remove cover (four screws).
2) 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 (continued on next page)