Information subject to change
96-8006123_11-03-2021
8302 OPERATOR’S MANUAL – SECTION 6
28
mode (Run/Standby LED solid amber) and remain
in Standby mode until both amplifiers in the system
have been energized. The system will automati
-
cally proceed to Run mode when both amplifiers
are energized and achieve Standby mode.
Switching the Power switch on either amplifier to
the OFF position will place both the amplifiers in
Standby mode.
Signal/Overload Indicators
When an input signal is presented to the Master
amplifier at a level greater than 0.5V, the Signal/
Overload indicators on both amplifiers will light
solid green. When signal distortion greater than
0.1% is sensed by the Master amplifier, the Signal/
Overload indicators on both of the amplfiers will
flash amber.
Fault Status Indicators
The three Fault Status indicators located on each
amplifier’s front panel are used to monitor the in
-
ternal conditions of the amplifier and will illuminate
when a fault condition occurs. Both amplifiers will
be placed in Standby mode when a fault condition
occurs.
Over/Under Line:
This fault condition will occur
when the detected AC mains voltage is outside of
the operable range of the amplifier (±10%). This
can occur if the amplifier’s back-panel breaker is
not in the on position (right), or if the AC supply
into the amplifier is higher or lower than the oper
-
able range.
To remove the system from Standby, the AC mains
must be brought to within the optimal range. First,
check to make sure the amplifier’s back-panel
breaker on both amplifiers is turned on. Next,
check the voltage level of the AC supply.
Once the fault condition has been cleared, both
amplifiers will return automatically to Run mode.
If the High/Low-Line indicator does not turn off or
if the system does not return from Standby, one
or both amplifiers may require servicing. See the
Troubleshooting
section in this manual
for more
information.
Overtemp:
Both amplifiers monitors the tempera
-
ture inside its high-voltage transformers and in
the output stage heat sinks. The amber Overtemp
indicator will light and the system will be placed
in Standby mode when the temperature sensors
in either amplifier detect a condition that would
damage the amplifier. If the Overtemp pulse is
extremely short, as in the case of defective wiring
or switches, this indicator may be lit too briefly to
observe.
To remove the system from Standby, make sure
the fans in both amplifiers are running and then
remove the input signal from the system. Allow the
fans to run until the system automatically returns
to Run mode. See the
Troubleshooting
section in
this manual for information on identifying and cor
-
recting the cause of an Overtemp fault condition.
Fault:
If the red Fault indicator lights on one
or both amplifiers, the system will be placed in
Standby. An amplifier may report a Fault status
under two conditions:
1.
High frequency oscillation is causing high
shoot-through current.
2.
An output transistor has shorted, causing the
output fault condition.
Cycle the front-panel Power switch (OFF, then ON)
on the amplifier(s) reporting the Fault condition to
reset each amplifier. When any amplifier report
-
ing a fault has been reset, cycle the Power switch
on the other amplifier to return the system to Run
mode.
On either amplifier in the system, if the fault
condition recurrs or does not clear, the amplifier
may require servicing. See the
Troubleshooting
section in this manual for more information. Re
-
pair or replace the faulty amplifier to re-enable the
system.
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