Amplifier Fault - Bose FREESPACE 4400 Owner's Manual

8.0 FreeSpace

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.
OUTPUTS
SYSTEM
STATUS
1 2 3 4
1 2 3 4
DIRECT
INPUT
INPUTS
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 loudspeaker
line, an overdriven amplifier, or a saturated output transformer.
• To check for a shorted loudspeaker line, remove the loud-
speaker connection 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 FreeSpace 4400
output, change to a different source. If the problem no longer
exists, use the FreeSpace 4400 Installer™ software to reduce
the input level of the original source that was overdriving the
output.
• To make sure an output transformer is not being saturated,
check to see if the correct loudspeaker 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
FreeSpace 4400 Installer™ software.
4400 System Troubleshooting
®
Check for
• Shorted wiring
• Overdriven amplifier
(reduce output gain)
STANDBY
• Transformer saturation
• Entry in FreeSpace
4400 Installer™ soft-
ware error log
AMP OUTPUT
indicators are red
Has the FreeSpace
4400 system shut
down during
operation?
No
Is SYSTEM
STATUS indicator
green?
Yes
Does the
FreeSpace 4400
Installer™ software
Error Log list
any amplifier
faults?
No
Contact your local
Bose representative or
visit pro.Bose.com
53 of 66
• Check the number of loudspeak-
ers connected to the FreeSpace
4400 system. Verify that the total
Yes
sum of loudspeaker taps con-
nected to the FreeSpace 4400
system does not exceed 400W.
• Verify that there are no shorts on
the loudspeaker output lines.
• Switch POWER to OFF.
• Disconnect the load and switch
No
POWER to ON.
• Verify that there are no shorts on
the loudspeaker output lines.
Yes
See amplifier fault troubleshooting
section for course of action.