Audio Amplifiers
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Figure 71 shows the AA-100 and AA-120 circuit board and identifies key components:
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Notes:
1. During complete loss of primary (AC) power, the AA-100 or AA-120 operates on
secondary (battery) power. To conserve secondary power, no LEDs light on the
AA-100 or AA-120 while operating on batteries.
2. An audio amplifier does not indicate a trouble condition until 40 seconds after a
fault occurs.
3. To calibrate audio amplifiers, install a 470-ohm resistor at the end of the low-level
audio circuit. If the low-level audio circuit is configured as four-wire looped
circuit, install a 470-ohm resistor at the point furthest from the AMG-1 or ATG-2.
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LED Lights when
NORMAL
LEVEL
The audio amplifier is adjusted properly and operating correctly
during normal (non-alarm) conditions.
INCORRECT
LEVEL
The audio amplifier is out of adjustment during normal (non-alarm)
conditions.
BATTERY
TROUBLE
The battery voltage is below a sufficient level.
BROWNOUT
The AC power source is below a sufficient level. During a complete
loss of AC power, no LEDs will light on the AA-100 or AA-120.
SPEAKER
TROUBLE
An open circuit condition occurs in the four-wire, high-level output.
INPUT
TROUBLE
A loss of the low-level audio input signal, or an amplifier failure
(see notes below).
AMPLIFIER
TROUBLE
A loss of the low-level audio input signal, or an amplifier failure
(see notes below).
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