Operation
Power
The power switch applies power to the amplifier; it does not con-
trol any associated equipment which may be connected to the
auxiliary power receptacle on the rear panel. The POWER
SWITCH illuminates when power has been applied to the unit.
Low-Cut Filter Switch
Caution:
To avoid electric shock,
be sure to disconnect AC Power
Cord before removing the cover of the amplifier unit.
DO NOT
perform any function requiring the removal of the cover of the
amplifier unless you are qualified to do so.
The Low-Cut Filter Switch designated SW1 is located next to the
transformer socket on the printed circuit board and is accessible
by removing the top cover of the amplifier. The switch provides
10 dB attenuation at 100 Hz.
Input Level Control
The input level control, located on the rear panel, adjusts the input
signal applied to the amplifier. Turn the adjustable screw clock-
wise to increase the level.
Warning:
Many loudspeakers may be damaged if overdriven.
Therefore, always begin system setup with the input level control
fully counterclockwise and gradually increase the setting to ob-
tain the desired output level.
Overload Shutdown Indicator
Electronic shutdown circuitry activates whenever an overload or
short occurs on the output of the amplifier. The front panel OVER-
LOAD SHUTDOWN LED illuminates indicating the discontinua-
tion of power output; once the cause has been determined and
rectified, the unit automatically resets.
Thermal Cut-Out
The amplifier is protected by a thermal cut-out which should not
trip under normal conditions. If it trips, check for inadequate ven-
tilation of the unit or overloading. The cut-out will automatically
reset after cooling.
AC Line Fuse
Replace the fuse only with same type rating. If a second fuse
blows, do not make any attempt to operate the unit. Consult the
Bogen Service Department or an authorized service agency.
