Troubleshooting
Phone Lines
Method 1
This procedure can be used to test a series of lines very quickly. It is especially useful for
determining which keys of a key system are associated with which lines, as well as verifying
that lamp and audible ringing functions operate as wired or programmed. This test is not in-
tended to test all LLM functions of all lines in all links: Use the #75 LLM Line Link
Test
for
that.
Step 1.
Step 2.
Step 3.
Note:
Dial #73, then enter the lowest or highest physical number of the type of phone line to be
tested.
Verify the HT display field hook switch status is correct:
+
if the subject phone is off-hook.
if the subject phone is on-hook.
Press
[1]
and verify one of the following conditions exist:
Line in use: The system connects the test phone and its receiver to the link in use.
A conference-call situation exists between the line users and test phone.
The LL field of the display reflects the change.
Say, “Testing” to announce yourself and immediately press [4] to disconnect
from the link and return to the test phone link.
Press [7] or
[ *]
to go to the next physical number and return to
Step 1
to
continue testing
Caution: Do not press
[ 4 ]
again: the specified line will be disconnected,
cutting-off the call in progress.
Line idle: One ring burst occurs each time the
[l] is
pressed. If a key system, one or
more ring bursts starting immediately or after several seconds delay.
Take
the phone under test off-hook
and verify that the - changes to +, in-
dicating the line hybrid detected the off-hook status of the line and transmit-
ted it to the CPU.
Verify two way communication between the test phone and the phone line
under test. If a
key system,
place the line on hold and verify the + remains
on the display. Also verify that the correct visual and audible indications
occur.
Press
[
4] to disconnect.
If a problem occurs in Step 3, do the following:
Check and correct any errors in the key system wiring and/or programming.
Try replacing the line hybrid in the suspect LLM (TC4150).
Step 4. Press [7] or [*] to go to the next physical number and return to Step 2 to continue testing.
1989
Rauland-Borg Corporation (Orig. 10/88; Rev. l/89)
Page
9 of 30
