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.
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| SYSTEM | • Shorted wiring | |||||||||
1 | 2 | 3 |
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| 4 | STATUS | • Overdriven amplifier | |||||||
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| AUDIO SOURCES |
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| STANDBY | • Transformer saturation | ||||||||
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| • Entry in Installer™ soft- | |||||||||
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1 | 2 | 3 |
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| 4 | INPUT |
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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 |
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operation? |
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| No |
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Is SYSTEM | No | ||
STATUS indicator |
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green? |
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| Yes |
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Does the Installer™ | Yes | ||
software Error Log list |
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any amplifier |
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faults? |
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| No |
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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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