GAI-Tronics 701-905 SmartSeries Handset/Speaker Amplifier - Manual (Page 9)

Pub. 42004-685L2D
701-905 S MART S ERIES
®
H ANDSET /S PEAKER A MPLIFIER P AGE 8 of 15
f:\standard ioms - current release\42004 instr. manuals\42004-685l2d.doc
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Adjustments
The User Adjustment Control is located beneath the GAI-Tronics nameplate on the front panel. Refer to
Figure 1. It is used to make all user adjustments normally required for installation. Loosen the two
screws on the GAI-Tronics nameplate and rotate it counterclockwise to access the adjustment hole. Make
adjustments by inserting a 1/8-inch flat blade screwdriver through the access hole and into the
potentiometer located directly behind the hole.
The User Adjustment Control potentiometer can be used to make three separate adjustments:
 Minimum speaker amplifier output level setting
 Offset amplifier level (difference between the ambient noise and the amplifier output levels)
adjustment
 VLC (Volume Level Control) adjustment (sets a preset speaker level to override the normal volume
control setting)
Minimum Speaker Amplifier Output Level Setting
To set the minimum amplifier output level, insert the 1/8-inch flat blade screwdriver into the User
Adjustment Control and set it fully counterclockwise. Listen for a single beep from the speaker
indicating the speaker amplifier is in the Minimum Level Adjustment mode. A continuous tone should be
heard after the beep tone. (See note below).
This test tone is used as a reference to adjust the speaker amplifier output level to the desired volume.
Turn the adjustment pot clockwise for the desired output. The test tone automatically shuts off 5 seconds
after the last adjustment. The factory default setting for minimum level is 4.0 watts nominal.
N OTE : If the page line is in use immediately after the beep tone, the page signal should be used to make
the minimum level adjustment. If the page line is inactive following the beep tone, a continuous tone is
activated to make the minimum level adjustment. After the tone is activated, all page line activity is
ignored until completion of the adjustment.
Offset Level Adjustment
The Offset Level allows the output of the SmartVolume™ speaker amplifier to maintain a set difference
or “offset” between the ambient noise level and the speaker output level. Turn the User Adjustment
Control fully clockwise and listen for the two beep tones indicating that the station is in the Offset
Adjustment mode. A continuous tone should be heard from the station speaker. Turn the adjustment pot
counterclockwise to the desired output level.
N OTE : If the page line is in use immediately after the two beep tones are heard, the page signal should be
used to make the offset level adjustment. If the page line is inactive immediately following the beep
tones, a continuous tone is activated to make the minimum level adjustment. After the tone is activated,
all page line activity is ignored until completion of the adjustment