Specifications
Page 9
Operation
Turning on the AC power
The AC mains power on the PA 2-250 is controlled by the Power rocker switch located on the rear
panel above the power cable (in the center of the panel). Once the AC power is turned on, the PA
2-250 will remain in Standby mode until the On/Off push button on the front panel is pressed or the
Trigger Input is asserted.
Status Indicators
When the PA 2-250 is in Standby mode, the single LED next to the front panel On/Off switch (the
On/Off LED) will be lit red; when the PA 2-250 is On, the On/Off LED and the two channel status
LEDs will be lit blue (Channel Status LEDs will NOT be lit if the rear panel Status LED switch is set
to Off).
Operating the PA 2-250 Manually
When the Power Mode switch is set to “On.” the PA 2-250 is controlled by the front panel On/Off
button. Press the On/Off button once to turn the PA 2-250 On and again to return it to Standby.
Operating the PA 2-250 in Trigger Mode
When the PA 2-250 is in Standby mode (On/Off LED is lit red), asserting a trigger signal turns the
PA 2-250 On and it remains On until the trigger is no longer asserted. If the trigger signal is already
active when mains power is applied, the PA 2-250 will switch On as soon as it completes self-test,
and will switch to Standby when the trigger is no longer asserted.
If the front panel On/Off switch is pressed while the PA 2-250 is On (after being switched on by an
asserted trigger), the On/Off switch will override the trigger and the PA 2-250 will return to Standby
position, even though the trigger is still being asserted. Pressing the front panel On/Off button,
dropping and re-asserting the trigger, or switching the mains power off and on again while the trigger
remains asserted, will then switch the PA 2-250 back to On.
Resetting a fault
If a short circuit or other fault occurs, the amplier will go into protect mode and shut down. When
this happens, the On/Off LED and the Channel Status LED for the channel with the fault will ash
red; the Channel Status LED for the non-faulting channel will extinguish (this will happen even if the
rear panel Status LEDs switch is Off).
To reset the protection, press the On/Off button twice after the fault has been removed. The fault will
also clear if the mains power is cycled off. If the fault persists, please contact Sherbourn Technical
Support.