Audio Amplifier Modules - GE Security EST3 Installation And Service Manual

Table 8-7: Control / display module troubleshooting
Problem
All module LEDs and switches
inoperative AND host module
working correctly
LEDs respond incorrectly
Switch activation does not
perform the required function
Table 8-8: 3-ZAxx Zoned Audio Amplifier module troubleshooting
Problem
Audio output level too low
No or extremely low audio
output
Audio level too high
Amplifier current limiting
Incorrect amplifier version
reported to CPU module
EST3 Installation and Service Manual
Possible cause
1. Ribbon cable between display and host module loose or
defective
2. Display not configured in SDU
3. Display defective
1. Display not defined in SDU database
2. LED misidentified in SDU database
3. Rule governing LED operation not correctly written
1. Display not defined in SDU database
2. Switch misidentified in SDU database
3. Rule governing switch operation not correctly written

Audio amplifier modules

Possible cause
1. Jumpers set for 25 Vrms when connected to a 70 Vrms
circuit
2. Gain adjusted too low
3. Input level to ASU too low
1. Fuse blown
2. Gain set too low
1. Jumper set for 70 Vrms when connected to 25 Vrms circuit
2. Gain adjusted too high
3. Input level to ASU too high
1. Audio circuit overloaded
2. Input level to ASU too high
1. Jumpers installed incorrectly
Service and troubleshooting
8.15