BOSE MA12EX Schematic
CLASS
FM
DWG NO.
317302-TT
REVISIONS
REV DESCRIPTION ENG DATE
00 INITIAL RELEASE BOB SMITH 9/09
SIGNATURES REQUIRED
PRINT NAME SIGNATURE
TSG REPRESENTATIVE BOB SMITH
CELL LEAD JOHN CURTIN / ERIC KAS
REPAIR SUPERVISOR
DAVID CORN
QUALITY RICHARD SMITH
TSG ENGINEER
Bob Smith
DATE
9/09
FRAMINGHAM, MA 01701-9168
APPLICABLE DOCUMENTS:
SERVICE MANUAL: 317302-SM
DESCRIPTION
MA12EX Loudspeaker (Tenor)
SIZE
A
Troubleshooting Tips
FSCM
32108
CLASS
FM
DWG NO.
317302-TT
PAGE 1 OF 2
REV
00
Description
Refer to the MA12EX Service Manual 317302-SM located on the Bose
http://intranet.bose.com/tsg
for any information not presented in this document.
®
Service intranet site at
1. Preventative Repair Measures
Note: Perform the following on all units returned for repair.
Product Check Action
MA12EX
Loudspeaker
CVT-MA12EX
Accessory
Transformer
None None
None None
2. Troubleshooting Tips
Product Symptom Check Action
MA12EX
Loudspeaker
MA12EX
Loudspeaker
CVT-MA12EX
Accessory
Transformer
Distorted
output
Intermittent /
no Audio
Cracked /
damaged
connector(s)
Intermittent /
no Audio
Cracked /
damaged
connector(s)
Drivers Using the tests in the service manual, sweep the
loudspeaker while listening to the individual drivers at
a close distance. Replace any defective drivers. You
can also perform the rub and tick test for individual
drivers if you are unsure if the driver is bad or not.
Connectors and
connections.
Connectors and
connections.
Check the input connectors for damage to the plastic
housing and the electrical connections. Replace any
damaged connectors.
Check the input and output connectors for damage
to the plastic housing and the electrical connections.
Replace any damaged connectors.
3. Software / Firmware Updates and EQ Changes
• Bose products that are used to drive and to provide EQ’s for installed MA12EX loudspeakers will need to
have the correct EQ installed on them. The EQ for the original MA12 Loudspeaker cannot be used for the
MA12EX. This can be done by updating the software / firmware for the device using the procedures in
their respective Service Manuals. Most of these products may already have the correct EQ installed.
• The service manuals are located on the Bose Service web site at http://serviceops.bose.com
list below for affected products.
DXA-2120 Amplifier
FreeSpace
Panaray
ControlSpace
Note: The MA12EX is not compatible with the Panaray System Digital Controller I. No EQ is available
for the MA12EX in that product.
®
4400 Amplifier
®
System Digital Controller II
®
ESP-88 / 88C / 00 Systems
. Refer to the
Framingham, MA 01701-9168
SIZE
A
FSCM
32108
CLASS
FM
DWG NO.
317302-TT
SHEET
2 of 2
REV.
00
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