Bose PANARAY MB4 Manuale utente

Service Manual

Panaray®MB4 Modular Bass

Loudspeaker System

Electronic Copy Only

CAUTION: The Bose®Panaray MB4 Modular Bass Loudspeaker System

contains no user-serviceable parts. To prevent warranty infractions,

refer servicing to warranty service stations or factory service.

PROPRIETARY INFORMATION

THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF

BOSE CORPORATION WHICH IS BEING FURNISHED ONLY FOR

THE PURPOSE OF SERVICING THE IDENTIFIED BOSE PRODUCT

BYAN AUTHORIZED BOSE SERVICE CENTER OR OWNER OF

THE BOSE PRODUCT,AND SHALL NOT BE REPRODUCED OR

USED FOR ANY OTHER PURPOSE.

The Bose Panaray MB4 Modular Bass Loudspeaker System is covered by a limited 5-year

transferable limited warranty.

Warranty

Contents

IMPORTANT SAFETY NOTICE: Do not attempt to remove the inserts holding the bass module

handle in place. These are held in place with a thread locking adhesive and ensure the integrity

of the mounting system. Any attempt to disassemble these parts will void the warranty. For this

reason the handle, end caps an inserts are not available as service parts.

Warranty.............................................................................................................................................2

Specifications....................................................................................................................................3

Product Description..........................................................................................................................3

Part List Notes...................................................................................................................................3

Packaging Part List, Panaray® MB4 Bass Loudspeaker (see Figure 1) ......................................4

Figure 1. Panaray MB4 Bass Loudspeaker Packaging View ...........................................................4

Main Part List, Panaray MB4 Bass Loudspeaker System (see Figure 2).....................................5

Figure 2. Panaray MB4 Bass Loudspeaker Exploded View .............................................................5

Disassembly Procedures .................................................................................................................6

Test Procedures ................................................................................................................................7

Figure 3. Panaray MB4 Test Setup Diagram ....................................................................................7

Part List, Panaray MB4 Bass Loudspeaker Protection Circuit Board (see Figure 3) .................8

Figure 4. MB4 Bass Loudspeaker Protection Board Layout.............................................................8

Figure 5. Panaray MB4 Bass Loudspeaker Wiring Diagram............................................................9

Service Manual Revision History...................................................................................................10

Specifications

External Dimensions: 26.7 x 10.2 x 18.1 in. (677 x 260 x 459 mm)

Weight: Single Speaker: 55 lb (25 kg)

Packed System: 62 lb (28 kg)

Sensitivity: 87 dB SPL, 40 - 300 Hz (1W, 1m free space)

System Protection: PTC, Lamp

Impedance: 8 Ohms nominal, 6.2 Ohms minimum

Power Handling: 200 Watts continuous per IEC-268 for 96 hours

Product Description

The Bose®Panaray®MB4 Modular Bass Loudspeaker System is a modular, low frequency

loudspeaker component that can be used in small, medium and large venues. It has a long-term

power rating of 200W. It uses four 5.25 inch bass drivers and has a bandwidth that extends

from 40 to 300 Hz. Its output, bandwidth and physical size makes it a useful unit quantity of

bass for use in singles and in multiples as a building block for any professional system.

The Bose Panaray MB4 Modular Bass Loudspeaker System has two standard colors: black and

white. The Panaray MB4 Modlular Bass Loudspeaker can be installed using an accessory wall

mount bracket.

Part List Notes

1. This part is not normally available from Customer Service. Approval from the Field Service

Manager is required before ordering.

2. The individual parts located on the PCBs are listed in the Electrical Part List.

3. This part is critical for safety purposes. Failure to use a substitute replacement with the

same safety characteristics as the recommended replacement part might create shock, fire

and/or other hazards.

4. This part is referenced for informational purposes only. It is not stocked as a repair part. Refer

to the next higher assembly for a replacement part.

Figure 1. Panaray MB4 Bass Loudspeaker Packaging View

Packaging Part List

Panaray®MB4 Bass Loudspeaker (see Figure 1)

Item

Number

Description Bose

Part

Number

Vendor Part

Number

Qty. Note

1 PACKING FOAM 259317 145A-7570-0 2

2 OWNER’S MANUAL 259162 4301-5189-1 1

3 POLYBAG, 12” x 16” x 49” N/A 1497-4552-0 1

4 MB4 BASS MODULE, BLACK

MB4 BASS MODULE, WHITE 027054

027055 FM000C

FM001C 1

5 CARTON 259316 145A-7590-0 1

Main Part List

Panaray®MB4 Bass Loudspeaker System (see Figure 2)

Figure 2. Panaray®MB4 Bass Loudspeaker Exploded View

Part NumberItem

Number

Description

Black White

Qty

Note

1 LOCKWASHER, LOGO - - 1

2 SPRING, LOGO - - 1

3 CUP WASHER, LOGO - - 1

4 GRILLE GASKET - - 1

5 GRILLE ASSY (WITH ITEMS 1, 2, 3 & 4) 298571 298572 1

6 SCREW, GRILLE, M4x28 298573 298573 4

7 PROTECTION CKT ASSY 298574 298575 1

8 TERMINAL PANEL 259193-1 259193-1 1

9 CONNECTOR, NEUTRIK 298548 298548 2

10 SCREW, NEUTRIK CONN, M3x12 - - 4

11 SCREW, TERMINAL PANEL, M4x16 - - 4

12 GASKET, WOOFER 298576 298576 4

13 WOOFER ASSEMBLY 298577 298577 4

14 SCREW, WOOFER, M4x16 - - 16

15 LOGO ASSY (WITH ITEMS 1, 2 & 3) 298578-001 298578-002 1

16 SCRIM FOR WHITE VERSION SPKR - - 1

Disassembly Procedures

Note: Refer to the figure below for the

following procedures.

1. Terminal Panel Removal

1.1 Using a Phillips-head screwdriver,

remove the four screws (11) that secure the

terminal panel (8) to the loudspeaker cabi-

net.

1.2 Gently pull the terminal panel away from

the cabinet. Be careful not to mark the

surface of the terminal panel or the cabinet.

1.3 Unplug the wiring harness from the PCB.

2. Grille Assembly Removal

2.1 Using an M4 torx-head screwdriver,

remove the four screws (6) that secure the

grille assembly (5) to the plastic end caps.

2.2 Gently pull the grille assembly (5) off of

the cabinet.

3. Woofer Assembly Removal

3.1 Perform procedure 2.

3.2 Using a Phillips-head screwdriver,

remove the four screws (14) that secure

the woofer assembly (13) that you wish to

remove to the loudspeaker cabinet.

3.3 Lift the woofer assembly out of the

cabinet and unplug the wires from the

woofer terminals.

Note: Be sure to replace the woofer gasket

(12) when you replace the woofer assembly.

4. Logo Removal

4.1 Perform procedure 2.

4.2 Clip off the lock washer (1) from the logo

assembly. Hold the spring (2) while clipping

the lock washer as the spring may fly off.

4.3 Pull the logo (15), cup washer (3),

spring and lock washer away from the grille.

Test Procedures

1. Air Leak Test

1.1 Set up the system for test as shown in

Figure 3.

1.2 Apply a 100 Hz, 10 Vrms sine wave to

the input connectors.

1.3 Listen carefully for any air leaks from

around the end cap, drivers and the baffle.

Air leaks will be heard as a hissing or sput-

tering sound. All repairs must be hidden.

Test duration should be 5 seconds minimum.

2. Rub and Tick Test

2.1 Perform disassembly procedure 3. It is

not necessary to unplug the wires at the

driver assembly terminals.

2.2 Connect a signal generator directly to

the terminals of the driver under test.

2.3 Apply a 10 Hz, 10 Vrms sine wave to the

driver assembly.

2.4 Listen carefully for any extraneous

noises, such as rubbing, scraping or ticking.

Note: To distinguish between normal sus-

pension noise and rubs or ticks, displace the

cone slightly with your fingers.

If the noise stays the same, it is normal

suspension noise and the driver is fine.

Suspension noise will not be heard with

program material.

3. Phase Test

3.1 Apply 10 VDC to the loudspeaker input

connector. Apply the positive to pin “1+” and

the negative to pin “1-” of the Neutrik®

connector.

3.2 When applying the DC voltage level,

observe the driver cones. They should all

move outward when the DC level is applied.

3.3 Rewire any incorrectly wired driver.

4. System Sweep Test

4.1 Set up the system for test as shown in

Figure 3.

4.2 Apply a 10 Hz, 10 Vrms sine wave to the

loudspeaker input connector.

4.3 While listening to the output of the

system, sweep the input frequency slowly

from 10 Hz to 400 Hz.

4.4 Listen carefully for any extraneous

noises such as buzzing or ticking.

Figure 3. Panaray®MB4 Test Setup Diagram

owe

ower

pli

plif

ier

INPU

INPUT

OUTPU

OUTPUT

Audio

Signa

Signal

Generato

Generator

Part List

Panaray®MB4 Bass Loudspeaker Protection Circuit Board (see Figure 4)

Figure 4. MB4 Bass Loudspeaker Protection Board Layout





Item

Number

Description Part Number Qty. Note

1 LAMP, GREEN DOT 298554 2

2 POLYSWITCH, RXE075 298555-075 1

Figure 5. Panaray®MB4 Bass Loudspeaker Wiring Diagram

PTC

LAM

LAMP

protective

lam

lamp

polyswitc

polyswitch

PCB

ELL

ELLOW

WOOFER

WOOFER 4

WOOFER

WOOFER 3

BLACK BLUE

WOOFER

WOOFER 2

WOOFER

WOOFER 1

RED

BLACK

BLUE

Service Manual Revision History

Date Revision

Level

Description of Change Change Driven

Pages

Affected

1/02 00 Document released at revision 00. Service manual

release All

10/06 01 Added RoHS compliant part numbers. RoHS initiative 4, 5

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