Bose 301 Series Bedienungsanleitung

Service Manual

P/N 181850 REV 1

301®SERIES IV DIRECT/REFLECTING®SPEAKER SYSTEM

PROPRIETARY INFORMATION

THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION

OF BOSE CORPORATION WHICH IS BEING FURNISHED 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 RE-

PRODUCED OR USED FOR ANY OTHER PURPOSE.

Table Of Contents

BOSE®301®SERIES IV TECHNICAL DESCRIPTION ............................................................................... 2

SPECIFICATIONS ......................................................................................................................................... 2

DISASSEMBLY/ASSEMBLY PROCEDURES .............................................................................................. 3

1. Grille Removal........................................................................................................................................... 3

2. Woofer Removal/Replacement ................................................................................................................. 3

3. 3" Tweeter Removal/Replacement............................................................................................................3

4. 2" Tweeter Removal/Replacement .......................................................................................................... 3

5. Remounting the Grille ...............................................................................................................................4

TEST PROCEDURES.................................................................................................................................... 5

1. Woofer Rub and Tick Test .........................................................................................................................5

2. Woofer Sweep Test ................................................................................................................................... 5

3. Tweeter Sweep Test.................................................................................................................................. 5

4. Air Leak Test ............................................................................................................................................ 5

5. Woofer Phase Test .................................................................................................................................... 5

6. Tweeter Phase Test................................................................................................................................... 6

7. Crossover Testing ..................................................................................................................................... 6

Figure 3: 301 Series IV Main Assembly Drawing ........................................................................................ 7

Figure 4: 301 Series IV Packaging Parts Drawing...................................................................................... 8

TABLES

301 Series IV Main Assembly Parts List ....................................................................................................9

301 Series IV Crossover Parts List .......................................................................................................... 10

301 Series IV Main Packaging Parts List ................................................................................................. 10

BOSE®301®SERIES IV TECHNICAL DESCRIPTION

The BOSE 301 Series IV speaker is a replacement for the 301 Series III and 4.2®Series II

speakers. It is a passive, two-piece (mirror image stereo pair) home loudspeaker in a bookshelf

configuration. The 301 Series IV is designed for use with standard amplifiers, receivers and other

related home audio components.

The 301 Series IV speaker utilizes separate inward and outward firing tweeters to achieve

consistent stereo imaging over a broad listening area (Stereo Everywhere®performance), while

maintaining a spacious sound stage.

Asethetically, the 301 Series IV speaker features molded plastic right and left side caps mounted

to a vinyl covered, particle board enclosure. This construction eliminates the use of edge-

banding, and maintains differentation with competitors due to horizontal placement on the

bookshelf.

The sum of all these unique features makes the 301 Series IV speaker capable of reproducing the

wide dynamic range demanded by today’s advanced recordings without strain or loss of clarity.

SPECIFICATIONS

Speaker Compliment: One 8" (20 cm) woofer

One 3" (7.6 cm) tweeter

One 2" (5.08 cm) tweeter

Nominal Impedance: 8 Ohms

IEC Power Rating: Min: 10 Watts per channel

Max: 75 Watts per channel

Cabinet: All Black, all Warm Gray or Rosewood

finish w/Black End Caps

Shipping Weight: 27.7 lbs. (12.6 kg) per pair

Speaker Dimensions: 10.25"H x 16.38"W x 9.5"D

DISASSEMBLY/ASSEMBLY PROCEDURES

Note: Refer to Figure 3 for the following proce-

dures.

1. Grille Removal: Both the front grille (1) and the

side grille (3) are held in place by a snap-fit and

are easily removed by hand. To remove,

CAREFULLY pull the grille away from the

speaker.

2. Woofer Removal/Replacement:

2.1 Remove the front grille as indicated in Proce-

dure 1.

2.2 Remove the 4 screws (11) holding the woofer

(9) in place.

2.3 Lift the woofer out and cut the wires connected

to the woofer terminals as close to the terminals

as possible.

2.4 Strip the wires and connect to the replacement

woofer. Make sure that the Red wire is con-

nected to the positive (+) terminal, both Black

wires are connected to the negative (-) terminal

and both Yellow wires are connected to the

woofer's "dummy" terminal, (no solder joint at

this terminal). Dress or twist wires to prevent

buzzing.

2.5 Remount the woofer to the cabinet using the

four screws.

3. 3" Tweeter Removal/Replacement: In order

to remove the tweeter it will first be necessary to

remove the woofer from the enclosure.

Note: The positive terminal of the tweeter is

marked with a Red dot.

3.1 Remove both the front and side grilles as

indicated in Procedure 1.

3.2 Remove the 4 screws that secure the woofer to

the enclosure and lift the woofer away from its

opening.

3.3 Remove the #8-32 screw (6) from the back of

the gasket backed tweeter (4) and separate the

tweeter from the molded bracket portion of the

endcap.

3.4 Cut the wires connected to the tweeter as close

to the tweeter terminals as possible.

3.5 Strip the wires and connect the replacement

tweeter. Make sure the Yellow wire is con-

nected to the positive (+) terminal and the Black

wire is connected to the negative terminal (-).

3.6 Remount the tweeter using the #8-32 screw.

3.7 Remount the woofer using the four #8-11

screws.

4. 2" Tweeter Removal/Replacement: In order to

remove the tweeter it will first be necessary to

remove the woofer from the enclosure.

Note: The positive terminal of the tweeter is

marked with a Red dot.

4.1 Remove the front grille only, as indicated in

Procedure 1.

4.2 Remove the 4 screws that secure the woofer to

the enclosure and lift the woofer away from its

opening.

4.3 Remove the #8-32 screw from the back of the

gasket backed tweeter (12) and separate the

tweeter from the molded bracket portion of the

endcap.

4.4 Cut the Yellow wire and the lamp lead con-

nected to the tweeter as close to the tweeter

terminals as possible.

4.5 Strip the Yellow wire and connect the replace-

ment tweeter. Make sure the Yellow wire is

connected to the negative (-) terminal and the

lamp is connected to the positive terminal (+).

Note: To replace just the lamp or both the tweeter

and lamp it will be necessary to remove the tweeter

by following procedures outlined in section 4.

4.6 Remount the tweeter using the #8-32 screw.

4.7 Remount the woofer using the four #8-11

screws.

5. Remounting the Grilles: Both side and front

grilles can only be mounted one way.

5.1 Side Grille: Align the feet with the fast-on

grommets. Press in lightly until the grille feet

are fully inserted into the grommets and the

snap is engaged.

5.2 Front Grille: Align the feet with the four mount-

ing holes on the end caps and press the grille in

lightly until the snaps are engaged.

TEST PROCEDURES

Note: Before performing any tests, remove both

grilles by following the grille removal instructions in

the disassembly section of this manual.

1. Woofer Rub and Tick Test: Connect the

output of a signal generator to the input of a

power amplifier. Connect the output of the

power amplifier to the input terminals of the

speaker under test, (see Figure 1). Adjust the

frequency of the generator to 45 Hz and the

amplifier output to 8 Vrms. No extraneous

noises such as rubbing, scraping or ticking

should be heard.

Note: To distinguish between normal suspen-

sion noise and rubs or ticks, slightly displace

the cone of the woofer with your fingers. If the

noise can be made to go away or get worse, it

is a rub or tick and the woofer should be re-

placed. If the noise stays the same, it is normal

suspension noise and the woofer is fine. Sus-

pension noises will not be heard with program

material.

2. Woofer Sweep Test: Sweep the signal genera-

tor from 10 Hz to 5 kHz using the 8 Vrms signal.

There should be no loud extraneous sounds. If

there are any loud buzzes or distortion, replace

the woofer.

Test Connections, 301®Series IV Speaker

FIGURE 1

+ -

Audio Signal

Generator Power Amplifier

Input Output

Back of Speaker

Under Test

- -

RIGHT

Red ( + )

Black ( - )

Note: There should not be any buzzes or

rattles from within the speaker cabinet. Re-

dress any wire or component that buzzes.

3. Tweeter Sweep Test: Reduce the amplifier

output to 3 Vrms and continue sweeping from 5

kHz to 15 kHz. Replace either of the tweeters

in which buzzing or distortion occurs.

4. Air Leak Test: Using an 8 Vrms signal, set the

generator frequency to 45 Hz. Listen for air

leaks around the woofer, tweeters and cabinet

seams (glue joints). Any air leaks will be heard

as a sputtering or hissing sound. The repair of

air leaks can be made by repositioning the

transducer gaskets.

5. Woofer Phase Test:

Note: In this test, supply voltage should only

be momentarily applied to the speaker input

terminals to avoid possible damage to the

speaker.

Set a DC power supply to 8 volts. To ensure

that the woofer is connected in phase, connect

the positive lead of the supply to the positive (+)

speaker input terminal and the negative lead to

the negative (-) input terminal. The woofer

should move outwards with the application of

the supply voltage.

FIGURE 2

Schematic Diagram

This ensures that the woofer and speaker input

terminals are wired in phase, (see Schematic

Diagram, Figure 2).

6. Tweeter Phase Test: Remove 4 screws and lift

the woofer carefully away from the speaker

cabinet in order to access the terminal cup.

Check the wiring on the terminal cup and on

both sets of tweeter terminals against the

schematic in Figure 2. This ensures that both

tweeters are wired in phase.

Crossover Measurements

Note: Due to the inaccessibility of the tweeters,

it may be necessary to remove the tweeters

from their respective endcaps. Refer to the

Disassembly Procedures on replacing

tweeters and for separating the tweeters from

the endcaps.

7. Crossover Testing: The crossover is tested by

measuring the voltage across a 10 Ω, 5 watt

resistor in series with the loudspeaker. See

Figure 2 and the following Table. If output

voltage is not within the limits shown, check

connections and component values for C1, C2,

and RT1.

RT1

YEL

2" TWEETER

8" WOOFER

3" TWEETER

BLK

YEL

RED

BLK

Z ( + )

Y ( - )

FIGURE 3: 301®Series IV Main Assembly Drawing

6789

B12

RT1

See Detail A for Logo

Variations and Placement

Detail A

Logo Variations & Placement

( Left Speaker Shown )

Note: Exploded view of end caps is to show

relative location of crossover components as

well as the tweeters and is not intended to

represent a serviceable part.

FIGURE 4: 301®Series IV Packaging Parts Drawing

1 2 3

4 5 6

301®Series IV Main Assembly Parts List (Figure 3)

Item

Number Description Part Number Qty.

Per

Speaker

Reference

1 Grille Assembly, Front:

Brown/Grey or

Black 181851-01

181851-00 1

2 Nameplate, Logo:

Large or

Small 122812-0

185208-01 1

3 Grille Assembly, Side:

Dark Brown or

Black 181856-01

181856-00 1

4Tweeter, 3" Gasket Backed 266161 111/4/2002

5 Grommet, Grille Socket 176068 2

6 Screw, Machine, 8-32 x .375, HexW, Hex 121441-06 2

7 Batting, Polyester, 12 x 2 116082 1 See Note

8 Gasket, Woofer, 8" 187395-208 1

9Woofer Assembly, 8" 181870-001 1

10 Connector, Barrier, 2 Position 181865 1

11 Screw, Tapp, 8-11 x .75, Pan 172672-12 4

12Tweeter, 2", Gasket Backed 181862-SP 1 10/1/2002

Note: This item is not normally stocked as a service part.

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