GAI-Tronics 227-005 SMART Auto-Dial Handset Telephones - Manual (Page 23)

Pub. 42004-443C
SMART A UTO -D IAL H ANDSET T ELEPHONES P AGE
21 of 31
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Handset Receiver Volume Adjustment
The VOLUME push button on the front panel allows the user to select one of five preset volume levels. At
its factory default setting, the volume level at the start of a call will be the lowest of the five preset levels.
Each momentary press of the
VOLUME button bumps the level up one step; from the topmost level, a
button press resets the volume to its lowest level. This provides for an adjustment range of more than 20
dB SPL.
The group of five available volume levels can be shifted with the handset receiver potentiometer R89.
Refer to Figure 13. If adjustment is desired, adjust R89 while the ambient noise level is low (and prior to
securing the front panel assembly).
After R89 is set to a suitable level (when the surrounding noise is low), one additional setting is available
from the TMA location. In the “Behavior” section of the Phone Management Form, the setting “Initial
Handset Volume” determines which of the five preset levels the telephone selects at the start of a call.
The factory setting is 0, the lowest receiver audio level. Changing this “Initial Handset Volume” setting
may be useful if the ambient noise near the telephone is typically high. By choosing one of the higher
initial levels, the telephone user may not need to bump the level up for every call made since the audio
level will already be at some comfortable higher level.
Handset Microphone Sensitivity Adjust
The handset microphone sensitivity can be changed with the Mic Vol potentiometer, R88. Refer to
Figure 13. If adjustment is desired, adjust R88 prior to securing the front panel assembly.
Auxiliary Outputs
Each telephone includes two isolated solid state switches capable of switching a maximum of 48 V dc,
125 mA, or 28 V
RMS
ac, 80 mA
RMS
. TB2 (OUT1) and TB5 (OUT4) on the SMART Telephone PCBA
provide the connections for the auxiliary outputs. Refer to Figure 13 for the location of TB2 and TB5.
The auxiliary output OUT1 (TB2) allows for control of external electric devices such as a ringing
indicator lamp. This isolated contact output activates while the telephone sounds its ringer at the start of
an incoming call and will extinguish when the handset is lifted from its cradle (call answered).
The auxiliary output OUT4 (TB5) can be remotely controlled via an appropriate DTMF command. This
remote control output could be used to activate or control a door latch, gate relay solenoid, alarm, etc.
from the called party location.