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8.0 E4 System Troubleshooting
8.4 Common problems
8.4.1 Communications port error
When you receive the communications port error dialog, the
FreeSpace
®
Installer™ software was not able to locate an E4
system on the COM 1 port.
This normally occurs due to one of three reasons:
• The PC and E4 are not connected via a “straight-wired” serial
cable.
• Another software application has control of the serial port.
Applications such as the Palm OS, or other audio applications
control the serial port while they are open. Close these applica-
tions and click the Try Again button.
• The E4 is connected to another communications port. If this is
the case you should select the appropriate COM port and click
the Try Again button.
Programmer’s Note: Before dismissing the “Choose
COM port” dialog, select the COM 2 port and click Try
Again. Not doing this will cause the COM 1 port to be
locked.
8.4.2 No audio in zone
If the system is powered on and operational, but there is no
sound, check the following:
• Do the front panel LEDs indicate normal operation?
• Is the source operating?
•Is routing correct?
• Is output gain correct?
• Is the output gain muted?
• Is cabling correct?
No audio in zone.
Are the AUDIO
SOURCES indicators
green?
• Make sure that the audio sources
are connected to the E4 LINE in-
puts and that there is an input sig-
nal from the source.
• Using the Installer™ software,
check that the input gain is raised.
• Make sure the source is on.
No
Yes
The amplifier is in “protect” mode.
Disconnect the load and see if the
output indicator changes to green.
If so:
• Check for a short in the output
line,
• Make sure no small strands of
wire are touching other wires,
• Make sure speakers are function-
ing correctly, or
• Using a voltmeter, check for a
voltage drop in the power line
when amplifier is being driven ex-
cessively hard.
See amplifier fault troubleshooting
section for course of action.
Is AMP OUTPUT
indicator red?
Are the
AMP OUTPUTS
indicators green?
Contact Bose
Customer Service.
Yes
No
No
Yes
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