Notifier AFP-300 Operation Manual

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5. Voice Alarm Systems Adjusting the Audio Gain Level (AA-30, AA-100/AA-120)38 AFP-300/AFP-400 Operations PN 50260:C1 05/22/97Adjusting the Audio Gain Level (AA-30, AA-100/AA-120)An audio amplifier contains a multi-position rotary switch that lets you adjust the gainof the audio output signal. This adjustment compensates for audio line losses. Aftercorrect adjustment, an audio amplifier can produce its maximum rated output power of25 Vrms (AA-30, AA-120) or 70.7 Vrms (AA-100). Refer to Figure 37 on page 37 forthe location of the Audio Gain Rotary Switch.When finished installing all amplifiers and associated circuitry, adjust the audio gain asfollows:1. Locate the Audio Gain Rotary Switch on the AA-30 (Figure 36) or the AA-100/AA-120 (Figure 37).2. Use a small slotted screwdriver to turn the Audio Gain Rotary Switch until theNormal Level LED and Incorrect Level LED are properly adjusted as shown inTable 34:Table 34 Adjusting the AA-30/AA-100/AA-120 Audio LevelSelecting the AA-100/AA-120 Backup ToneAn audio amplifier automatically produces a backup tone when the low-level audioinput 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(See Figure 37 on page 37).2. Set SW1 to Hi/Lo or Slow Whoop as the default backup tone (Figure 38).Figure 38 LSW1 Backup Tone Switch (AA-100/AA-120 only)Audio Level Normal Level LED Incorrect Level LEDProperly adjusted ★ ✩Adjusted too low ✩ ★Adjusted too high ★ ★★ LED on ✩ LED offHi/Lo Slow WhoopCaution: Remove ACpower at the main servicecircuit breaker (not thecircuit breaker on the mainpower supply).!Audio Gain Rotary Switch(See Figure 37 on page 37for location of switch.)Technical Manuals Online! - http://www.tech-man.com

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