Bose B2000 User Manual download pdf (Page 12)

5. Operation

5.1 Switch on

At S

witch

-on the protection circuit will initially activate whilst the circuits stabilise.

Assuming no faults are detected after a few seconds only the POWER LED (and

SIGNAL indicators if signal is applied) will illuminate.

5.2 Level

ontrols

These are analogue controls allowing precise level settings. Note that in BRIDGED

mode only channel A control is active.

5.3 Signal

ndicators (blue LED)

These

are active from a minimu

m output level of approximately

Watt

1500

) or

10 watts

(

B2000

)

and are an indication only of signal presence.

5.4 Limiters (amber LED)

The B

1500

& B2000 amplifiers incorporate signal limiters, which are preset to

prevent clipping with high levels of drive. The amber

LED's

on the front panel

illuminate to indicate operation of the limiters.

Fault indicator (Audio Protection

red LED)

If the outputs are shorted or if DC is present, the protection circuit will disengage the

outputs and the Audio Protection (A/P) LED will illuminate. The amplifier will

continue to be monitored and depending on the type of fault, will either reset after the

fault has been cleared or by switching the mains switch off and then on again after a

w seconds. (See also temperature control above)

Temperature related faults will reset once the unit has cooled sufficiently.

Output short circuits will require manual reset after clearing the fault.

Bridged (green

LED)

This indicates the position of the switch on the rear panel and is illuminated when

bridged mode is selected with the switch pressed in.

Temperature

ontrol

The cooling fans respond to temperature sensors within the unit to maintain a safe

operating temperature. In the event of excessive temperature, the protection circuit

will disabl

e the output. The red Audio-

Protect (A/P) LED will indicate this condition

(see fault indicator).

The B

1500

has two fans connected permanently with variable speed.

The B2000 has one fan per channel and

has a jumper link to enable them from cold.

Normal dynamic signals will not cause the amplifier to overheat unless the

ventilation is inadequate. (See installation section and maintenance section.)

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Bose B2000 User Manual Page 12

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