How To Adjust The Audio Gain Level For An Audio Amplifier; How To Select The Aa-100 And Aa-120 Backup Tone - Notifier AFC-600 Operating Manual

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An audio amplifier contains a multi-position rotary switch that lets you adjust the gain
of the audio output signal. This adjustment compensates for audio line losses. After
correct adjustment, an audio amplifier can produce its maximum rated output power of
25 Vrms (AA-30, AA-120) or 70.7 Vrms (AA-100). Refer to Figure 70 on page 66
(AA-30) or Figure 71 on page 67 (AA-100 and AA-120) for the location of the Audio
Gain Rotary Switch.
When finished installing all amplifiers and associated circuitry, adjust the audio gain.
To so by using a small slotted screwdriver to turn the Audio Gain Rotary Switch until
the LED and
NORMAL LEVEL
Table 33:
Audio Level Normal Level LED
Properly adjusted
Adjusted too low
Adjusted too high
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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 or AA-120 circuit board
(See Figure 71 on page 67).
2. Set SW1 to Hi/Lo or Slow Whoop as the default backup tone (Figure 72).
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LED are properly adjusted as shown in
INCORRECT LEVEL
Incorrect Level LED
#
✩
#
# ✩
LED on LED off
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AFC-600 Operations PN 51033:A 3/8/99
Audio Amplifiers
✩
#
#
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