Power-up and testing
6.16 EST3 Installation and Service Manual
9. Disconnect each phone station/jack station, and verify that a
Trouble message appears in the Trouble queue. Restore the
connections.
3-ZAxx Audio Amplifiers
1. Verify that the module is properly seated in both rail
connectors and secured with the two snap rivets. Verify that
removable terminal strips are firmly seated.
2. Verify that the 3-ASU is installed using accepted
workmanship standards.
3. If wired with a backup amplifier, verify that the backup
amplifier’s wattage is equal to or greater than the wattage of
any primary amplifier it can replace. If mixing 15-, and
30-watt amplifiers with 20-, and 40-watt amplifier modules,
make sure the back up amplifier is 20 or 40 watts, whichever
is required.
4. Verify that the EVAC and Page signals are available at the
speakers
5. Create an amplifier fault. Verify backup amplifier
substitution.
6. Class B amp output configuration: Disconnect the module’s
audio output wiring (TB2-7 & TB2-8) from the 3-ZAxx, and
verify that the appropriate amplifier Trouble message
appears in the Trouble queue. Restore the connection.
7. Class B supplementary NAC output configuration (3-ZA20
& 3-ZA40 only): Disconnect the module’s supplementary
notification appliance circuit wiring (TB2-3 & TB2-4) from
the 3-ZAxx, and verify that the appropriate Trouble message
appears in the Trouble queue. Restore the connection. Short
the module’s supplementary notification appliance circuit
wiring (TB2-3 & TB2-4) from the 3-ZAxx, and verify that
the appropriate Trouble message appears in the Trouble
queue. Remove the short.
Control/display modules
1. Verify that the display(s) are properly seated in the module
and secured with the four snap rivets. Verify that the ribbon
cable between the display and its host module is firmly
seated on both ends.
2 Activate the lamp test and verify all lamps operated as
follows:
Select the Command Menus button to obtain the Main Menu
screen.
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