EST3 Installation and Service Manual

Service and troubleshooting

Audio components

3-ASU Audio Source Unit

Table 8-13: 3-ASU Audio Source Unit Troubleshooting

Unit does not respond. No network RX or TX LED activity

1. Power or data connectors loose or connected wrong on Rail

Chassis Interface Card

2. Ribbon cable between Rail Chassis Interface Card and

3-ASU (and 3-FTCU, if installed) loose or defective

3. Ribbon cable between 3-ASU main board and cover loose or defective

No All Call page audio output from network amplifiers and low level page output terminals

1. Defective microphone

2. Page inhibit timer set too long

3. Defective 3-ASU

4. Ribbon cable between 3-ASU main board and cover loose or defective

5. Defective amplifier

No All Call page audio output from network amplifiers, output available at low level page output terminals

1. Network audio data riser open, shorted, or incorrectly wired

2. Network data riser open, shorted, or incorrectly wired

3. TB2 on the CPU loose or incorrectly wired

4. 3-ASU not properly configured in SDU database

Page audio distorted

Auxiliary Input volume level too low

5. Amplifiers not properly installed or defective

1. Speaking too loud into microphone. Speak such that the last green LED on the page level meter only flickers occasionally

2. Gain of individual amplifiers set too high

1. Adjust Aux input gain control on ASU

2. Auxiliary input wiring open or shorted

Auxiliary Input volume level too high

Recorded messages not working properly

Wrong messages going to wrong floors

1. Adjust Aux input gain control on ASU

1. 3-ASUMX memory not firmly seated in connector

2. Audio database not correctly downloaded into 3-ASU

3. Incorrect message label referenced.

1. Amplifier and message labels and rules incorrect or mislabeled

Telephone Page inoperative 1. Wiring between 3-ASU and 3-FTCU open, shorted, or incorrectly wired

8.20 EST3 Installation and Service Manual