Bose E4 manual Amplifier fault, AMP Output

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8.0 E4 System Troubleshooting

8.2.3 Amplifier fault

The AMP OUTPUT LEDs work in pairs (1 and 2, 3 and 4) and indi- cate the operating status of the four amplifier output channels.

 

 

AMP OUTPUTS

 

 

 

 

 

 

 

Check for

 

 

 

 

SYSTEM

• Shorted wiring

1

2

3

 

 

4

STATUS

• Overdriven amplifier

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(reduce output gain)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AUDIO SOURCES

 

 

 

STANDBY

• Transformer saturation

 

 

DIRECT

 

 

• Entry in Installer™ soft-

 

 

 

 

 

 

 

 

 

 

 

1

2

3

 

 

4

INPUT

 

 

 

 

 

 

ware error log

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

When an amplifier fault occurs, the amplifier mutes its outputs and indicates an error. After a short period of time the amplifier will try to operate again. If the fault condition persists, the ampli- fier will attempt to restart six times, after which it will remain muted.

Amplifier faults are typically caused by a shorted speaker line, an overdriven amplifier, or a saturated output transformer.

To check for a shorted speaker line, remove the speaker con- nection from the amplifier channel. If this resolves the problem, locate and correct the shorted loudspeaker line.

To make sure that you are not overdriving the E4 output, change to a different source. If the problem no longer exists, use the Installer™ software to reduce the input level of the orig- inal source that was overdriving the output.

To make sure an output transformer is not being saturated, check to see if the correct speaker EQ setting is selected.

If none of these actions solve the problem, read the instructions in the following flow chart or check the error log using the Installer™ software.

AMP OUTPUT

indicators are red

Has the E4 unit

Yes

shut down during

 

 

 

 

operation?

 

 

 

No

 

 

 

 

 

 

 

 

 

Is SYSTEM

No

STATUS indicator

 

 

 

 

green?

 

 

 

Yes

 

 

 

 

 

 

 

 

 

Does the Installer

Yes

software Error Log list

 

 

 

 

any amplifier

 

 

faults?

 

 

 

No

 

 

 

 

 

 

 

 

 

Contact Bose

Customer Service.

Check the number of loudspeak- ers connected to the E4 unit. Verify that the total sum of loud- speaker taps connected to the E4 unit does not exceed 400W.

Verify that there are no shorts on the speaker output lines.

Switch POWER to OFF.

Disconnect the load and switch POWER to ON.

Verify that there are no shorts on the speaker output lines.

See amplifier fault troubleshooting section for course of action.

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Contents FreeSpace E4 Series II Business Music System Declaration of Conformity Contents Contents System fault E4 System TroubleshootingE4 hardware indicators IntroductionAmplifier fault AMP OutputNo Standby and System indicators Input clippingDirect input is active Hardware configuration FreeSpace E4 system Error LogContents of the Error Log Power-on self-test resultsAmplifier alarms Amplifier alarms using output voltage and currentSolving faults reported in the Error Log Input and output alarm historyCommon problems Communications port errorNo audio in zone User interface keypads do not operate correctly Bad sound in a zoneCustomer support Auto Volume does not calibrateReporting software bugs and issues Technical assistanceFor Windows NT Restoring E4 Microcontroller Code Restoring E-4 Microcontroller Code Bose Product Sales Conditions
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