Bose 2150 Specifications download pdf (Page 32)

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Problem Cause or Solution

No sound, no power • 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.

Power on, low output • Input level controls set too low. Reset.

or no output • 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.

Playback mixed • Check or replace the connecting cables.

with hum • 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.

Distortion • 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.

Unnatural sound • 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.

Care • 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.

6.0 Troubleshooting

Troubleshooting

(Usually signal-source,

bad cable or partial

output short circuit

related.)

(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.)

(Some parts of the

frequency band do not

sound balanced with the

rest of the band.)

(Usually indicates a

power supply problem,

either in the power line or

the amplifier’s power

supply.)

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Bose 2150 Specifications Page 32

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