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Bose 251 Manual
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Bose 251 Manual

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251 Environmental Speaker 256033
Product Description ..........................................................................................................................2
Disassembly/Assembly Procedures ...............................................................................................2
Specifications................................................................................................................. ...................2
Disassembly/Assembly Procedures ...............................................................................................3
Figure 1. Wiring Diagram ....................................................................................................................3
Test Procedures ................................................................................................................................4
Figure 2. Schematic Diagram ..............................................................................................................4
Part List ..............................................................................................................................................5
Figure 3. Exploded View ......................................................................................................................5
Packaging Part List ...........................................................................................................................6
Figure 4. Packaging View ....................................................................................................................6
The Bose 251 Environmental Speaker is covered by a five year transferable limited warranty.
Contents
CAUTION: The Bose
®
251™ Environmental Speaker contains
no user serviceable parts. To prevent warranty infractions,
refer servicing to warranty service centers or factory service.
PROPRIETARY INFORMATION
THIS DOCUMENT CONTAINS PROPRIETARY INFORMA-
TION OF BOSE CORPORATION WHICH IS BEING FUR-
NISHED ONLY FOR THE PURPOSE OF SERVICING THE
IDENTIFIED BOSE PRODUCT BY AN AUTHORIZED BOSE
SERVICE CENTER OR OWNER OF THE BOSE PRODUCT,
AND SHALL NOT BE REPRODUCED OR USED FOR ANY
OTHER PURPOSE.
WARRANTY INFORMATION
1

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Summary of Contents for Bose 251

  • Page 1: Table Of Contents

    IDENTIFIED BOSE PRODUCT BY AN AUTHORIZED BOSE SERVICE CENTER OR OWNER OF THE BOSE PRODUCT, AND SHALL NOT BE REPRODUCED OR USED FOR ANY OTHER PURPOSE. WARRANTY INFORMATION The Bose 251 Environmental Speaker is covered by a five year transferable limited warranty.

  • Page 2: Product Description

    251 Environmental Speaker 256033 PRODUCT DESCRIPTION The Bose 251™ Environmental Speaker is a premium environmental loudspeaker. Each loud- ® speaker contains one 5.25” environmentally resistant woofer in a two-chamber configuration, two 2.5” environmentally resistant Twiddlers™ vertically stacked and angled for maximum horizontal dispersion and a crossover including system protection.

  • Page 3: Disassembly/Assembly Procedures

    251 Environmental Speaker 256033 DISASSEMBLY/ASSEMBLY PROCEDURES (Refer to Figure 4) 9.2 Remove the four screws (12) that secure 4.2 Line up the Twiddler™ in the cabinet and the Twiddler panel (15) to the baffle. Pry off replace the four screws (12) that secure the the panel.

  • Page 4: Test Procedures

    251 Environmental Speaker 256033 TEST PROCEDURES 4.5 Listen for buzzes, rattles or other noises. 1. Woofer Rub and Tick Test Redress any wire that buzzes; replace the 1.1 Apply a 6 Vrms, 10 Hz signal to the woofer or Twiddler if they are found to be speaker input terminal.

  • Page 5: Part List

    251 Environmental Speaker 256033 PART LIST Item Description Part Number Number 289780-001 WOOFER, 5.25", ENVIRONMENTAL TWIDDLER , 60MM, ENVIRONMENTAL 289783-001 POLYSWITCH, 60V, 160 190348-160 33uF, 50V, BI-POLAR, ELECTROLYTIC, AX 254351 GRILLE, METAL, BLACK 250804-11 GRILLE, METAL, WHITE 250804-12 LOGO, BLACK CABINET...

  • Page 6: Packaging Part List

    251 Environmental Speaker 256033 PACKAGING PART LIST Item Description Part Number Number CARTON, RSC, 15.63X11.63 X 16.06 294092 PACKING, END CAP, TOP 250809 PACKING END, CAP 250810 BAG, POLY, HDPE, 18 X 26, 1 MIL 255354-001 CREASE SHEET 15.50 X 33.25...
  • Page 7 Bose 251™ Environmental Speaker ® Service Manual 2004 Bose Corporation © Part Number 256033 REV. 01...
  • Page 8 ECN 33972 - REV 00 TO REV 01 Specifications and Features Subject to Change Without Notice Bose Corporation The Mountain Framingham Massachusetts USA 01701 P/N 256033 REV. 01 3/2004...