Failure Isolation - Comdial ExecuTech N0308 System Manual

IMI 66-064

FAILURE ISOLATION

SYSTEM STATUS INDICATOR
The red LED located near the fuse holder is the
system status indicator. This indicator should turn on
steady when AC power or the optional external battery
power is applied to the common equipment. If the
indicator flashes after power up, it could be indicating
a processor failure. Unplug and reconnect the AC
power, and observe the LED indication. If it still shows
a flashing indication, equipment replacement may be
necessary. A flashing indicator when battery power is
being employed is an indication of battery discharge.
STATION SELF TEST
1. Disconnect the line cord at the station base.
NOTE: The adjacent odd or even station will be
disabled during the time that the station line
cord is being disconnected and reconnected..
2. Press and hold the MUTE button, and reconnect
the line cord to the station connector. The station
will automatically perform a self test routine.
Release the MUTE button as soon as the test
begins. The sequence of the test is as follows:
•
The indicators will light in sequence.
•
Indicators will then turn off in an orderly
sequence.
•
The ringer will sound - Be sure that the ringer
volume control is set to the medium or high
volume setting. On some telephone models, the
ringer may sound before the indicators are turned
off.
3. Replace any station that does not pass the self test.
DSS/BLF CONSOLE SELF TEST
1. Disconnect the console line cord plug from the line.
2. Press and hold the station 10 select button while
reconnecting the line cord plug to the line.
NOTE: The companion station will be disabled during
the time that the console is being disconnected
and reconnected.
3. Release the station 10 select button, and note that
the BLF indicators will each turn on in sequence
beginning with the station 10 indicator. The
indicators will then turn off and the console will
become operational.
FAILURE INDICATIONS
If erratic light indications or ring signals occur at a
paired station, an open data pair at either station may
be the fault.
•
A station with an open data line may work properly
on a short loop but fail on a long loop.
Stations are paired for overload current protection. If a
fault occurs which causes more than 300 ma. of
current to be drawn, the paired stations are disabled
by circuit action.
Disconnect the disabled stations and reconnect them
one at a time to isolate the faulty one.
3-18
System Description