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Framingham, MA 01701-9168 SIZE
A FSCM
32108 CLASS
FM DWG NO.
290177-TT SHEET
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Troubleshooting Tips
Companion® 5 Multimedia Speaker System
Refer to the Companion® 5 Multimedia Speaker System service manual reference number 290177-SM
for schematics, PCB layouts and parts lists located on service web site.
Preventative Repair Measures
Note: Perform the following on all units returned for repair.
Product Check Action
Companion 5
Upgrade the Companion 5
firmware to ensure compatibility
with Microsoft Vista operating
systems Applies to systems built before June, 2007 (DOM
7152). Upgrade the Companion 5 firmware. Refer to
the Bose Service Operations web site for software
update information.
Service Bulletin: 290177-B1
* Check to see if the DOM is
between 4/23/07 (7113) and
6/3/07 (7154) Replace C48 (on the DSP PCB) with a new part,
using p/n: 261614-472HB3.
Service Bulletin: 290177-B2
Troubleshooting Tips
Product Symptom Check Action
Companion 5 The LED wont
switch to green Check L50 on the
DSP PCB for 1.2
Vdc Check L50 or pin 25 on U7000 for 1.2Vdc. If the
1.2V is missing and Vsnub (26V) is present,
replace U50 and U51 with part numbers 288281-
001, and 289259-001, respectively.
Companion 5 Dead unit Check F1 on the
I/O PCB Using a multi-meter to check F1 for continuity. If
there is no continuity, replace the fuse with p/n:
269855-02000.
Companion 5 No audio or
volume control
from the
computer Make sure the
computer and the
Companion are
synchronized If all cables are connected and seated properly, try
closing and reopening Windows Media Player, to
ensure detection and synchronization between the
PC and the Companion 5. Also, make sure the
volume is turned up at least half way in Windows
Media Player.
Companion 5 No volume
control from the
control pod Check the control
pod Try rotating the outer ring of the control pod
clockwise, and then counter clockwise. Listen for
change in the volume. If the volume does not
change, reseat the control pods connector into the
bass module. If the control pod is not connected,
the bass module defaults to full volume. If the
control pod is defective, replace the control pod
with p/n: 294599-001.
Companion 5 No audio from
speakers or
headphones Check Q10 on the
DSP PCB Check Q10 voltages referencing the table below. If
the output voltage is missing (Vraw 14.6V), replace
Q10 with p/n: 271765-002.
Q10 voltages in circuit.
S 21V
G 17.3V
D 14.6V
