9
No sound heard
No sound heard from one side
The speaker wires or audio cables
are not wired correctly or are bad.
The front mounted level adjust-
ment on one side is turned all the
way down.
A speaker is not working. Make
sure by connecting the channel
to a speaker that you know to be
working.
Hum or buzzing sound is heard
The sound may be caused by a
ground loop in the system. Try to
eliminate this by reversing the AC
plugs of other components in the
system.
Other causes may include faulty
cables.
Amplifier will not turn on
The amplifier must be plugged
into a live outlet. The power
switch on the front panel must be
on.
Audio cable to the source compo-
nent is not connected properly or
the cable is bad. Try another cable
that you know is good.
The Problem
Possible Causes and Solutions
The BB50 is designed to function trouble-free. Most problems occur because
of operating errors. If you have a problem, please check the troubleshooting
list first. If the problem persists, contact your authorized SpeakerCraft dealer or
SpeakerCraft Customer Service at 800-448-0976.
TROUBLESHOOTING
8
Refer to
Diagram 1
for the locations of the following:
POWER SWITCH
The switch marked "Power" on the front panel of the amplifier will turn off all
amplifier circuitry no matter which turn on mode is selected. Refer to the
"Power Mode Selection" section for further information.
ACTIVE LED
When lit, the Active LED indicates that the amplifier is operating. Refer to the
"Power Mode Selection" section of this manual for further information.
LEVEL ADJUSTMENT SCREWS
Level Adjustment Screws are used to adjust the level of the amplifier output
so that you can match the output levels of other amplifiers in your system.
Use them also to set a maximum level in multi-rooms, so that speaker volume
controls and wall speakers in the remote rooms cannot be overdriven and
damaged.
Use a small slotted screwdriver to adjust the screws. If you do not use them
for these purposes, it is best to leave the adjustments at their factory default
position (turned fully clockwise).
OPERATION
3 PRONG REMOVABLE POWER PLUG
Plug the female end of the AC cord supplied with the BB50 into the receptacle
on the rear panel of the amplifier.
(See Diagram 2)
Insert the plug directly into
a 120V 60Hz wall outlet.
CAUTION:
Do not plug the amplifier into the pre-
amplifier’s or receiver’s switched or unswitched outlet. If you wish to have
the amplifier turn on once the preamplifier or receiver is activated, use the
“Auto On” power mode selection.
120V AC OUTLET
Use this outlet to power other system components.
