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8.2.4 Input clipping
If clipping is occurring at the input of an amplifier channel, the
source LED will blink red.
AMP OUTPUTS
SYSTEM
1
2
3
4
STATUS
AUDIO SOURCES
DIRECT
INPUT
1
2
3
4
If this fault occurs:
• Reduce the output gain of the source, or
• Using the Installer™ software, reduce the input gain for the
channel that is clipping.
8.2.5 Direct input is active
If the DIRECT INPUT LED is red:
• Check that the DIRECT INPUT/CONTROL contact closure is in
the closed position.
• Check the device to which this input is connected.
AMP OUTPUTS
SYSTEM
STATUS
1
2
3
4
AUDIO SOURCES
DIRECT
INPUT
1
2
3
4
8.0 E-4 System Troubleshooting
STANDBY
STANDBY
8.2.6 No STANDBY and SYSTEM indicators
STANDY & SYSTEM LEDs
are off - AC power is on
Is E-4 unit
plugged into an
AC source?
Yes
Is the E-4
POWER switch
set to ON?
Yes
Is STANDBY
indicator on?
No
Is SYSTEM STATUS
indicator red?
No
Is the unit properly
configured for the line
voltage?
Yes
Contact Bose
Customer Service.
63 of 76
No
Plug the E-4 unit into an AC
receptacle.
No
Set E-4 POWER switch to ON.
Yes
Press the STANDBY switch on the
E-4 front panel.
• Connect your PC to the E-4 unit
and read the Error Log.
Yes
• Check the results of the Power On
self test (POST).
• Use the POST troubleshooting
chart for course of action.
• Set E-4 POWER switch to OFF.
• Verify that E-4 unit is configured
for the correct AC line voltage.
No
• Verify that the fuse is good.
• Verify that the AC receptacle is
live.
• Set POWER switch to ON.