Vertical comdial DX-120, Руководство по установке и обслуживанию

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DX-120 Installation and Maintenance Manual
T
ECHNICAL
P
ROBLEM
S
OLUTIONS
No system operation (continued)
SPI Bus Error 1) Switch KSU power to the OFF position.
2) Remove cover (four screws).
3) Locate each expansion module.
4) Verify the ribbon cable connection is accurate
and secure.
5) Check for improper aligning of module
connectors.
6) Detach all station cabling and retest.
7) Check all socketed IC's for good "seated"
connections.
8) Unplug one module at a time and retest until
failed component is found.
9) Perform Initialization and Power Up sequence.
NOTE:
This is an emergency action since the
unique customer database will be erased
and the system will reboot with default
database programming.
10)If this does not clear the trouble, replace KSU1
and initialize it as described in “Power-up
Initialization (Cold Start)” on page 72.
Telephone/
Terminal apparatus
not working CPU Heartbeat
LED flashing and
408M/408E/DPM8
module Heartbeat
flashing but one or
more digital
telephones are not
functioning. Shorted station
cabling. 1) At the KSU, power the system dow.
2) Remove the power cord from the AC outlet.
3) Remove the KSU cover (four screws).
4) Disconnect all station wiring on the affected
408M, 408E, DPM8, or DPM16 and connect
one known-good DET directly to one of the
interface ports.
5) Replace the KSU cover and retest with this
phone.
Follow the above procedures to test each inter-
face port as needed. If any port is found faulty
or not working, replace the module. Other-
wise, replace the wiring/cabling.
Faulty Telephone If the above test yields all working ports and no
cabling errors
• Test each connected telephone one at a time until
the faulty telephone is discovered.
• Replace the faulty telephone(s).
NOTE:
Digital telephones use only one twisted cable pair for power, data control and voice communications. There are
no fuses for station interface protection. Instead, a current sensing Polly-switch limits excessive current going to
each terminal connection. If a station cable pair is shorted or a telephone’s DC power supply is damaged, the
Polly-switch will temporarily open to protect the KSU Module circuitry.
Diagnostic Quick Reference Chart (continued on next page)
Diagnostic Quick Reference Chart (continued)
Symptom(s) Diagnostic Aid Cause(s) Action