Page 1
REVISIONS
REV DESCRIPTION ENG DATE
00 INITIAL RELEASE BOB SMITH 5/09
SIGNATURES REQUIRED
TSG REPRESENTATIVE BOB SMITH
CELL LEAD
REPAIR SUPERVISOR
OTHER(________________)
TSG TECHNICIAN
Bob Smith
PRINT NAME SIGNATURE
KEVIN KING
DATE
5/09
FRAMINGHAM, MA 01701-9168
CLASS
FM
DWG NO.
294963-TT
APPLICABLE DOCUMENTS:
SERVICE MANUAL: 294963-SM
DESCRIPTION
SIZE
A
FreeSpace 4400 Amplifier
FSCM
32108
CLASS
FM
DWG NO.
294963-TT
PAGE 1 OF 5
REV
00
Page 2
Troubleshooting Tips
FreeSpace® 4400 Amplifier
Refer to the FreeSpace 4400 amplifier service manual, reference number 294963-SM for
schematics, PCB layouts and parts lists. It’s located on the Service web site at
http://intranet.bose.com/tsg
Preventative Repair Measures
Note: Perform the following on all units returned for repair.
Product Check Action
FreeSpace
4400
amplifier
There are no preventative measures to perform on this amplifier.
or http://serviceops.bose.com on the Pro Products page.
Troubleshooting Tips
Product Symptom Check Action
FreeSpace
4400
amplifier
Outputs 1 and 2
and/or 3 and 4
fault LEDs lit.
System STATUS
LED is lit red
Ribbon cables
Output FETs
Amplifier setup
and installation
wiring
Error log for
amplifier module
fault conditions
Power supply
fuses
1. Verify that all of the ribbon cables that connect to
the DSP and the other boards are properly seated
into their connectors. Replace any damaged cables.
2. Check the outputs FETs on the upper and lower
amplifier boards. Verify that they are properly
secured to the heatsink and that they are not
shorted to it.
3. Check for a shorted speaker line in the
installation wiring.
4. Check that the source is not overdriving the
channel.
5. Check for loudspeaker transformer saturation.
Verify that the proper loudspeaker EQ’s are being
used.
6. Line voltage too high (surge). Check the unit’s
error log for an entry that the rail voltage exceeded
150V in 70V mode (US installs) or 190V in 100V
mode (Euro).
7. Live voltage too low (brownout) Using the
FreeSpace Installer software, check the unit’s error
log for an entry that the rail voltage was lower than
normal by at least 20%.
8. 70/100V mode switch position changed with unit
operating. Check that the output voltage setting (70
or 100V) is correct for the region the unit is used in.
Check that the AC input voltage selection switches
are set properly for the region.
9. Blown power supply fuse (not the AC line fuse).
Check the outputs FETs on the upper and lower
amplifier boards. Verify that they are properly
secured to the heatsink and that they are not
shorted to it. Replace the fuse and perform the test
procedures in the service manual. If the fuse blows
again, replace the amplifier module and retest.
Framingham, MA 01701-9168
SIZE
A
FSCM
32108
CLASS
FM
DWG NO.
294963-TT
SHEET
2 of 5
REV.
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Page 3
Product Symptom Check Action
FreeSpace®
4400
amplifier
FreeSpace
4400
amplifier
System STATUS
LED is lit red
System STATUS
LED is lit red
Error log and
system wiring
Error log for
power-on self
test failure
1. Switch the system to STANDBY and then back to
active again. If the SYSTEM STATUS LED is green,
the system may have logged an error. Check the
error log on the unit using the FS 4400 Installer
software.
2. Switch the system to STANDBY. Set the power
switch on the rear panel to OFF. Wait for the
STANDBY indicator to turn off. Set the power switch
to ON. Press the STANDBY switch and check to
see if the SYSTEM STATUS LED is now green.
3. Switch the system to STANDBY. Set the power
switch on the rear panel to OFF. Disconnect all
input and output signal cables. Set the power switch
to ON. Press the STANDBY switch. Reconnect one
cable at a time and check the SYSTEM STATUS
LED and the error log to see if there are errors.
The power-on self test (POST) checks five major
hardware components. Connect to the system using
the FreeSpace Installer software to view the error
log messages. The failures types are below.
1. Host controller – will cause the message “Poweron self test incomplete” to appear in the host
controller test section of the error log. This is usually
caused by a SRAM address failure.
2. Flash memory – Contains the system
configuration, design file and the system event
schedule. Error log will have an entry “Power-on
self test incomplete” in the host controller flash test
section.
3. Peripheral controller – This monitors contact
closures, rear panel connections and user interface
connections. Error log will have an entry “Power-on
self test incomplete” in the peripheral controller
flash test section of the error log. Check the user
interface wiring for shorts or a failed keypad.
4. DSP – The DSP performs all signal processing
and routing functions. Error log will have an entry
“Power-on self test incomplete” in the DSP test
section of the error log.
5. Upper and lower amplifier – Amplifier channels 1
and 2 are located on the upper amplifier board.
Channels 3 and 4 are located on the lower amplifier
board. The upper and lower amplifier test
determines if the amplifiers are working properly.
Error log will have an entry “Power-on self test
incomplete” in the upper or lower amplifier test
section of the error log.
Framingham, MA 01701-9168
SIZE
A
FSCM
32108
CLASS
FM
DWG NO.
294963-TT
SHEET
3 of 5
REV.
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Page 4
Product Symptom Check Action
FreeSpace®
4400
amplifier
FreeSpace
4400
amplifier
FreeSpace
4400
amplifier
Customer
complains that
the unit goes into
Protect mode
repeatedly, then
shuts down
Communications
port error
No audio in zone LEDs and
Installation
wiring
Input high
frequency noise.
PC setup and
connection
wiring
system setup
1. Call the installer and have him verify that the
number of speakers connected to the amplifier
channels is correct and that the installed wiring is
not shorted.
2. Check the unit’s error log to see if a fault is
entered. Refer to the service manual
troubleshooting section for help with determining
the cause of the failure.
3. Check the input source material for excessive
high frequency content. Also check for a potential
ground loop. This will cause the amp to go into
protect mode. It will repeat the protect cycle 6 times
and shut down if the high frequency content is not
removed.
1. Check that the DB9 – DB9 cable used is a
“straight-wired” serial cable. Do not use a null
modem cable as the wiring is not the same.
2. Check the PC to see if another software
application has control of the serial COM port.
Applications such as the Palm OS or other audio
applications can control the port while they are
open. Close these applications and click the TRY
AGAIN dialog button in the system software.
3. Verify that the COM port settings are correct.
4. Verify that the FS 4400 is connected to the
correct COM port. Connect to the correct port and
click on the TRY AGAIN dialog button.
Note: In the FreeSpace Installer software, before
dismissing the “choose COM port” dialog in the
system software, select the COM 2 port and click
the TRY AGAIN button. Not doing this will cause the
COM 1 port to be locked. If the port locks, you must
restart the computer.
If the system is powered on and operational, but
there is no sound, check the following:
1. Do the front panel LED’s indicate normal
operation?
2. Is the audio source operating?
3. Is the signal routing correct in the system setup?
4. Is the output gain correct (not too low)?
5. Is the output gain muted?
6. Is the installation cabling correct?
Framingham, MA 01701-9168
SIZE
A
FSCM
32108
CLASS
FM
DWG NO.
294963-TT
SHEET
4 of 5
REV.
00
Page 5
Product Symptom Check Action
FreeSpace®
4400
amplifier
FreeSpace
4400
amplifier
FreeSpace
4400
amplifier
Bad sound in a
zone
User interface
keypads do not
operate correctly
Auto Volume
does not calibrate
System setup
and input level
System setup
and wiring
System setup
and wiring
1. Verify that the correct speaker EQ is selected in
the FreeSpace Installer software for that zone.
2. Verify that the loudspeakers for that zone are
wired in phase.
3. Reduce the gain in the affected zone using the
FS Installer software until the amp output indicator
for that zone is solid green.
4. If the input and output indicators are green and
the sound is still distorted, verify that the input
source signal is clean. If the source is from a mixer,
reduce the mixer gain to see if it is overdriving the
amp channel.
5. Verify that the total load impedance for the zone
is within specified limits for the selected mode of
operation.
1. Check the wiring of the RJ-45 connectors.
2. Check for breaks or shorts in the keypad
installation wiring.
3. Using the FreeSpace Installer software, check
the error log for a peripheral controller error. Repair
or replace a defective keypad.
1. Verify that the connected loudspeakers are not
set to too high a tap setting.
2. Verify that the maximum output gain is less than
-20dB.
3. Verify that the audio source is operating.
4. Verify that the source level setting is not too low.
5. Check for broken microphone cable.
6. Check that the loudspeakers are connected.
7. Check that the sensing microphone is connected
and that it is not connected to the wrong zone.
Framingham, MA 01701-9168
SIZE
A
FSCM
32108
CLASS
FM
DWG NO.
294963-TT
SHEET
5 of 5
REV.
00
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