Bose l1 compact portable line array system 318882 b1 d7 bull
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Page 1
JEEP
SERVICE B U LLETI N Bettersound through research®
Bulletin Part Number: 318882-81
Product: L1 Compact Portable Line Array System
Subject: Defective diodes from vendor
Disposition: On all L1 Compact systems built before 7/24/09 (DOM 9205)that are sent in for service, replace
Zener diodes Z1, 22 and Z7 using the following procedure.
Symptom: No symptom or dead unit.
Reason: Defective diode(s) from the part manufacturer may fail prematurely.
Solution: Perform the rework procedure below.
Rework Procedure:
1. Using the disassembly procedures in the service manual, remove the power supply / power amplifier PCB
assembly from the power stand cabinet.
2. Locate and remove zener diodes Z1, 22 and Z7. Discard.
3. Using Bose part number 325372-0018, replace Z1, 22 and Z7 with new parts. The diodes are On-Semi
1N5347B, 5W, 10V zener diodes with axial leads. Be sure to observe polarity when installing the new parts.
4. Re-install the power supply / power amplifier PCB assembly into the power stand cabinet.
5. Perform the power stand test proce-
dures located in the L1 Compact service
manual to ensure proper operation before
returning the system to the customer.
Notes:
1. Refer to the L1 Compact service
manual, 318882-SM, located on the
sen/ice web site located at
http://serviceops.bose.com for
disassembly and test procedures.
2. Refer to the board layout diagram at
right and the schematic diagram located
on page 2 of this bulletin for the locations
of Z1, Z2 and 27 in the circuit and on the
circuit board.
Date Issued: 8/09
Bose Corporation; The Mountain, Framingham, Ma. 01701-9168 page 1 of 2
Service documentation available online at http://serviceops.bose.com
Page 2
SERVICE BULLETIN
Z1 and Z7 locations
imuF/Jsv
L1 Compact schematic
section from sheet 1 of 2
TO FRE-AMP SECTION
AW 0-
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4. SCR1
A SCR2
4. SCR3
A SCR4
4. SCRS
74. SCR6
V
Z1 and Z7 locations
L1 Compact schematic
section from sheet 2 of 2
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4 0 L14 nun
7-.
Bose Corporation; The Mountain, Framingham, Ma. 01701-9168
Service documentation avaiiable online at http://serviceops.bose.com
page 2 of 2