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Removing and Installing the Controller Chassis
Description, Installation, Operations, and Maintenance Manual
Federal Signal www.fedsig.com
5.3.3 Preparing Amplifier Installation and Removal
CMOS circuitry is incorporated within this equipment. Observe Electro-Static Discharge
precautions when removing, installing, and servicing amplifiers.
Before removing or installing an amplifier, turn off the circuit breaker
supplying power to the unit. Do not use the power buttons on the front panel.
5.3.4 Removing the Amplifier Chassis
To remove the Amplifier Chassis:
1. Press a latch near the right handle and remove the front cover to expose the dust filter
and cable connections. (See Figure 15.)
2. Write down or photograph the labels and positions of all the cables exposed by the
removed front cover.
3. Unplug four audio/control signal cables on the bottom left. Unplug one large 100 V
audio output cable in the bottom center. Unplug two standby cables on the bottom
right.
4. Move the cables out of the way of the Chassis.
5. Undo the front captive retaining screws under left and right handles.
6. Carefully and slowly slide the Amplifier Chassis out. Be ready to hold its weight
once it slides all the way out.
5.3.5 Installing the Amplifier Chassis
To install the Amplifier Chassis:
1. Temporarily secure the cables out of the way of the Amplifier Chassis to be placed in
the empty chassis position.
2. Carefully slide the Amplifier Chassis into its mainframe position ensuring that no
cables are pinched in the process.
3. Tighten the front retaining screws.
4. Plug all the cables into their former positions as previously recorded.
5. Attach the front cover, using three slots on the left side as hinges and carefully
closing like a door on the right side, until the latch clicks in position.
5.3.6 Replacing the Internal Cards
CMOS circuitry is incorporated within this equipment. Observe Electro-Static
Discharge precautions when removing, installing, and servicing amplifiers.
Do not connect power or any cables to the amplifier removed from the cabinet.