Bose FreeSpace E-4 Owner's Manual - Page 9

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A number of fault conditions can be displayed in the Input Status

section:

DC Sense Fault: A power supply fuse, output FET, ampliﬁer mod-

ule, or some combination of the above has blown. The unit

should be replaced.

Ampliﬁer Module Fault: When the Ampliﬁer Module fault occurs

by itself it can be caused by any of the following:

• Shorted speaker line – Check the loudspeaker line for shorts.

• System power exceeds 400W – Check that system power

does not exceed 400W.

• Speaker transformer saturation – Check that proper speaker

EQ is being used or use a high-pass ﬁlter for speaker EQ.

• Line voltage too high (surge) – Check Error Log for a rail volt-

age that exceeds 150V, in 70V mode, or 190V, in 100V mode.

• Line voltage too low (brownout) – Check Error Log for a rail

voltage which is lower than normal by at least 20%.

• 70/100V mode switched with unit operating – Check that out-

put voltage and AC input voltage selector are correct.

• Blown power supply fuse (as opposed to AC line fuse) –

Replace the E-4 unit.

AC Power Fault: Might be an AC line dropout or severe brownout,

or simply AC power turned off without ﬁrst placing the E-4 in

standby mode. You can check that the power has been removed

from the E-4, or that you experienced a power dropout.

Sleep Mode: The host microcontroller has told the ampliﬁer and

power supply to turn off. This only occurs in conjunction with

another alarm (usually AC power fault), because it in itself is not

an alarm condition. When an AC power dropout occurs, the

ampliﬁer immediately shuts the ampliﬁer and speaker relay off,

then the other processing is shut down. This all happens fast

enough to prevent data loss or corruption, and to prevent loud

pops in the speakers. When this occurs you should check the

alarm history to determine what other faults occurred at this time.

High-Frequency Sense Fault: This protection mode is designed

to prevent damage to the ampliﬁer or speakers from excessive

high-frequency audio or ultrasonic energy. The ampliﬁer is not

capable of sustained operation at full power in the 10kHZ to

20kHz (+) range.

8.0 E-4 System Troubleshooting

66 of 76

Generally, this fault results in a one-time 3-second dropout. If,

when the ampliﬁer tries to restart after 3 seconds, the excess HF

is still present, the amp (and speaker relay) will remain off for

another 3 seconds and the loop repeats. Six of these in a row

will cause the amp to shut down, and will trigger a Retry Fault.

When this fault occurs you can check your program material for

excessive high-frequency content, or for a potential ground loop

which has created an oscillation internal to the E-4 unit. You can

also reduce the output gain for this ampliﬁer zone in an attempt

to reduce the high-frequency energy going to the ampliﬁer.

Retry Fault: The ampliﬁer has tried to start up or recover from a

fault condition at least six times. When this occurs, you will need

to place the E-4 unit in standby and then press the STANDBY

button again to clear the fault, at which time the E-4 unit will

again try to start up.

When this occurs you should check the alarm history section of

the Ampliﬁer Alarm to determine the exact fault type that trig-

gered the Retry Fault.

Input and output alarm history

This part of the Error Log displays the sequence of fault condi-

tions where "0" is the initial fault reported followed by "1-6".

These occur over a very short period of time.

8.3.5 Solving faults reported in the

Error Log

When errors are reported in the Error Log, you can try to solve the

problem by performing one of the following actions:

• On the E-4 rear panel, turn the POWER switch to OFF. Wait a

few seconds and turn the POWER switch to ON. Then press

STANDBY on the front panel.

• On the E-4 rear panel, turn the POWER switch to OFF. Discon-

nect all input/output signal cables. Wait a few seconds and

turn the POWER switch to ON. Then press STANDBY on the

front panel. Reconnect one cable at a time and check the Error

Log.