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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
(6 pages)
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