CLASS
FM
DWG NO.
REVISIONS
REV DESCRIPTION ENG DATE
00 INITIAL RELEASE PETE CORTESE/
6/09
BOB SMITH
SIGNATURES REQUIRED
PRINT NAME SIGNATURE
TSG REPRESENTATIVE BOB SMITH
CELL LEAD DAVID MIKEL
REPAIR SUPERVISOR
KEVIN KING
OTHER(________________)
TSG TECHNICIAN
Pete
DATE
5/09
FRAMINGHAM, MA 01701-9168
Cortese
APPLICABLE DOCUMENTS: DESCRIPTION
SERVICE MANUAL: 172780-SM
Bose
®
BUILT-INvisible® Amplifier
Troubleshooting Tips
SIZE
A
FSCM
32108
CLASS
FM
DWG NO.
172780-TT
PAGE 1 OF 2
REV
01
Troubleshooting Tips
Bose
Refer to the Bose® BUILT-INvisible® Amplifier service manual, reference number 172780
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
Replace all 100uF, 50V caps as
Built Invisible
Amplifier
* Heat sink
a precaution. The caps may
have leaked, causing damage to
the surrounding pcb etches and
components.
®
BUILT-INvisible® Amplifier
Replace the following 100uF, 50V caps with new
components, part number 149948-101H.
PCB Number Ref Des
175466, 170015 C819, C822
174562 C26, C165, C166
170010 C16, C17,
170021 C107, C207, C307, C407
If a unit returned for service has a gold colored heat
sink, Polyimide tape should be added to the heat sink
to prevent the personality PCB from shorting to the
heat sink. This should be done even if the unit does
not exhibit the symptoms mentioned above. Refer to
service bulletin 172780-B1.
Troubleshooting Tips
Product Symptom Check Action
Check for open fuses on the power supply
Built Invisible
Amplifier
*
Dead F800, F801 and F802
Dead, blows
fuse when
powered on
Power amplifier PCB
board. If one or more are open check for
shorted transistors on the amplifier pcb (See
tip below).
Check the transistors that mount to the
heatsink assembly for shorts. Also check for
cold solder joints on the driver transistors.
Framingham, MA 01701-9168
SIZE
A
FSCM
32108
CLASS
FM
DWG NO.
172780-TT
SHEET
2 of 2
REV.
01
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