Troubleshooting
Speakers
This test will identify open or grounded speaker lines via the
VCM
Speaker Sense current
(refer to Drawing KC1472). An alternative to the following test would be to place a meter or
meters across the D and E terminals of a target speaker to monitor dc resistance and/or resis-
tance to ground.
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Note:
Dial #73, then enter the lowest or highest physical number of the group of speakers to be
tested.
Test
Option: After entering #73, enter the physical number of the VCM, press
[1]
and
then increment or decrement to the desired physical number with
[
7 or *] .
This will
allow
talk/listen audio from each speaker when tested.
Press
[
2 ] to turn on the speaker relay and note the following if a speaker is present:
A supervisory beep occurs at the remote location.
A V appears in the display if there is an SC25 relay and speaker and the speaker
station does not have an activated privacy switch.
If the test option was selected in
Step 1, room sounds will be audible at the test
phone. If there is no audio, a ground or activated privacy switch may be present.
Press [5] and verify the V goes off and the supervisory beep discontinues. If this doesn’t
happen, another relay and speaker may be on.
Press
[
7] and verily the physical number in the display increments by one.
Return to Step 3 and repeat the above steps until all speakers have been tested.
Some tests
require monitoring the
HT
display field. If the software in use is prior to version
102, a two-digit hexadecimal value will be displayed instead of the characters noted in the
procedures. If a hexadecimal value appears, use the following #73 Hexadecimal Equivalents
Table to interpret the display.
Find the displayed hexadecimal
value under HEX and then locate the equivalent character set
under HT. Note
that each character set may be represented by either one of two different
two-digit hexadecimal values. The
H
character represents the hook-switch status and the T
character is the Call-in Switch status.
#73 Hexadecimal Equivalents Table
HEX
HT HEX
HT HEX
HT
00 80 --G
10 90 NG
18 98 +G
02 82 --R 12 92 NR lA
9A +R
03 83 --N 13 93 NN 1B
9B + N
Page 8 of 30 1989 Rauland-Borg Corporation (Orig. 10/88; Rev. l/89)
