AUTOPULSE IQ-396X Operations Doc. 50403:B 07/22/96 35
Audio Amplifiers
An amplifier contains a multi-position rotary switch that lets you
adjust the gain of the audio output signal. This adjustment compen-
sates for audio line losses. After correct adjustment, an amplifier can
produce its maximum rated output power of 25 VRMS (AA-30, AA-120)
or 70.7 VRMS (AA-100).
Adjusting the Audio Gain Level
When finished installing all amplifiers and associated circuitry, adjust
the audio gain as follows:
1) Set the audio amplifier to normal standby.
2) Use a small slotted screwdriver to turn the rotary switch until the
Normal Level LED and Incorrect Level LED are properly adjusted.
The following table shows the LED indicators when adjusted properly,
when adjusted too low, and when adjusted too high.
Adjusting the AA Audio Level
LED on
LED off
An audio amplifier automatically produces a backup tone when the
low-level audio input is lost. You can select the backup tone by
following these steps.
1) Locate SW1 in the lower right-hand corner of the AA-100/AA-120
circuit board.
2) Set SW1 to Hi/Lo or Slow Whoop as the default backup tone.
Hi/Lo
Slow Whoop
Audio Gain Rotary Switch
How to Adjust the Audio Gain
Selecting the AA-100/
AA-120 Backup Tone
SW1 Backup Tone Switch
Audio Level Normal Level LED Incorrect Level LED
Properly adjusted
Adjusted too low
Adjusted too high
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