GE Security EST3 Installation And Service Manual page 273

Table 8-17: SIGA-AAxx Audio Amplifier troubleshooting
Problem
No output
Backup 1 kHz Tone sounding
Low Output
EST3 Installation and Service Manual
across the NAC B output (TB4-2 and TB4-3), then connect the
dummy load to the NAC A Output terminals (TB4-4 and
TB4-5).
Do not operate the amplifier with both the speaker
Caution:
circuit and the dummy load connected.
Possible cause
1. 24 Vdc power or input signal missing
2. Output circuits wired incorrectly
3. Daughter board not firmly seated in connector
4. Module defined incorrectly in database
5. In backup mode with backup amplifier or wiring problem
6. Branch circuit control modules inoperative or programmed
incorrectly
1. Input wiring incorrect or missing
2. Low or no audio input
1. 70 Vrms speakers with 25 Vrms jumper setting
2. Too many SIGA-CC1s or SIGA-CC2s installed causing
amplifier to shut down
3. Gain (R116) setting too low
Service and troubleshooting
8.23