GAI-Tronics 709-901 Panduan Pengguna - Halaman 9

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709-901 S

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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:



the minimum Speaker Amplifier output level setting



the Offset Amplifier level (difference between the ambient noise and the amplifier output levels)



the VLC (volume level control) adjustment

(sets a preset speaker level to override the normal volume control setting).

Minimum Level Adjustment

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.

: If the page line is in use immediately after the beep tone, the page signal should be used to make

OTE

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.

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