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8504 OPERATOR'S MANUAL – SECTION 4
4 Amplifier Operation
4.1 Front-Panel Controls and Indicators
This section provides an overview of Front-Panel
controls and indicators found on the 8504. Refer fo
Figure 4.1 for component locations.
4.1.1 Power Switch
The Power switch controls the power to the am-
plifier's high-voltage transformers. Switch to the
ON position (|) to energize the amplifier. Switch to
the OFF position to remove power from the high-
voltage transformers and place the amplifier in
Standby mode.
4.1.2 Run/Standby Indicator
Run mode: The indicator will be lit solid green.
The amplifier's high-voltage transformers are ener-
gized and the unit will amplify the input signal.
Standby mode: The indicator will be lit solid am-
ber. The amplifier will be placed in Standby when
one of the following conditions occurs:
1. High/Low Line error
2. Overtemp condition
3. Fault condition
4. The user presses the front-panel power switch
to the OFF (O) position.
In Standby mode, the amplifier's low-voltage trans-
former is energized but the high-voltage transform-
ers are not.
96-8005353_8-12-2020
Figure 4.1 – Front Panel Controls and Indicators
Information subject to change
To release the amplifier from Standby mode:
1. High/Low Line error: Clear the over- or un-
der-voltage condition. The amplifier will resume
operation when the input voltage is brought
within the operating range of the amplifier.
2. Overtemp condition: Leave the amplifier in
Standby mode with the fans operating to cool
the amplifier. When the amplifier's internal tem-
perature drops to less than 100°C, the amplifier
will resume operation.
3. Fault condition: Press the front-panel power
switch to reset the amplifier. If the fault condi-
tion recurrs or does not clear, the amplifier may
require servicing. See the Troubleshooting
section for more information.
4. Power switch pressed: When the amplifier is
operating (Run mode), pressing the front-panel
power switch will place the amplifier in Standby
mode. Press the power switch again to release
the amplifier from Standby and return the am-
plifier to Run mode.
4.1.3 Signal/Overload Indicator
Signal Presence: When an input signal is pre-
sented at an active signal input on the amplifier
at a lever greater than 0.5V, the Signal/Overload
indicator will light solid green.
Overload (clipping): The indicator will flash
amber intermittantly. When the indicator flashes
amber, this indicates that the output of the system
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