Bose 2150 Panduan Pemasang - Halaman 32

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Bose 2150 Panduan Pemasang

6.0 Troubleshooting

Troubleshooting
Problem
No sound, no power
(Usually indicates a
power supply problem,
either in the power line or
the amplifier's power
supply.)
Power on, low output
or no output
(Usually signal-source,
bad cable or partial
output short circuit
related.)
Playback mixed
with hum
Distortion
(Usually caused by excessive
loss in the input controls when
the mixer/equalizer/crossover
does not produce enough output.
Also caused by over-driving that
results in output clipping, or
current limiting caused by
excessively low load imped-
ances.)
Unnatural sound
(Some parts of the
frequency band do not
sound balanced with the
rest of the band.)
Care
32
Cause or Solution
• Check amplifier. Power off, then turn on.
• Linecord disconnected.
• Poor fit between the plug and AC receptacle. Try another receptacle.
• Power off at AC receptacle. Check with tester or lamp.
• Blown amplifier fuse. Replace fuse.
• No source playing.
• Faulty connection between mixer and amplifier.
• Open thermal breaker in the power transformer. Allow amplifier to cool
and the breaker will reset itself.
• Input level controls set too low. Reset.
• Check to see if problem is at the source. Move the input
connections to another amplifier you know is working.
• Be sure that there are no small strands of wire touching similar
strands coming from the other wire in the cable.
• Make sure the speakers are functioning correctly.
• If you are using bridged-mono mode, make sure the stereo/mono
switch is set correctly.
• Use a voltmeter to determine if the power line voltage is dropping
excessively when the amplifier is driven hard.
• Disconnect equipment in the FX loop to be sure that the equipment
is not faulty.
• Check remote volume control.
• Check or replace the connecting cables.
• Make sure that each screw terminal connection is tight.
• Signal cables may have been routed too closely to AC cables,
power transformers, motors, or other EMI inducing device.
• Connect another source to the power amplifier inputs. If the hum
stops, the problem lies with the original source component.
• Check input level controls. If set too low, the preceding piece of
equipment may not have sufficient output to overcome the loss.
• Check speaker connections and verify that all screw connections
are tight and that there are no stray strands of wire to cause
short circuits.
• Verify that the total load impedance presented to the amplifier
is within the limits described in this manual for the mode of
operation selected.
• Check the EQ cards. Verify that the EQ card corresponds to the
model speaker being used and that the EQ card is installed in the
proper channel. Verify that the speakers are connected to the
same channel that the corresponding EQ card is installed in.
• Speakers may be out of phase.
• Wipe the front panel and chassis with a soft, dry cloth.
• For stubborn spots, use a mild dish soap or detergent sparingly
applied to a soft cloth.
• Don't use alcohol, ammonia, or other strong solvents.