Bowers & Wilkins 804 D3 Bedienungsanleitung

Bowers & Wilkins TECHNICAL SUPPORT

The contents of this document and associated files contain confidential information that is propriety to Bowers & Wilkins, and

are intended solely for the purpose of servicing the product. The information is intended for use by service technicians familiar

with electronic products. No part of the contents should be supplied or published elsewhere.

Page 1 of 51 © Bowers & Wilkins 2016

Distributor Service Technical Manual

804 D3 Speakers

Produced by: T. Taylor

Bowers & Wilkins TECHNICAL SUPPORT

The contents of this document and associated files contain confidential information that is propriety to Bowers & Wilkins, and

are intended solely for the purpose of servicing the product. The information is intended for use by service technicians familiar

with electronic products. No part of the contents should be supplied or published elsewhere.

Page 2 of 51 © Bowers & Wilkins 2016

Revision History

Date

Revision

Details

22 MAR 2016

Initial Release

800 Series Tool Kit

Bowers & Wilkins TECHNICAL SUPPORT

The contents of this document and associated files contain confidential information that is propriety to Bowers & Wilkins, and

are intended solely for the purpose of servicing the product. The information is intended for use by service technicians familiar

with electronic products. No part of the contents should be supplied or published elsewhere.

Page 3 of 51 © Bowers & Wilkins 2016

Content

Front Cover Page 1

Revision History & 800 Series Tool Kit Page 2

Content Page 3

Introduction Page 4

Technical Sheet Page 5

1. Tool and Test Equipment Page 6

2. Cosmetic Inspection Page 7

3. First Functional Test Page 8

4. Basic Wire Connections to Speakers Page 8

5. Bi-Wiring Connections to Speakers Page 9

6. Bi-Amplification Connections to Speakers Page 9/11

7. Vertical Bi-Amplification Connection to Speakers Page 11/12

8. 804D3 Mechanical Drawing & Spare Parts List Page 13/15

9. Wiring Diagram for 804D3 Page 16

10. Tweeter Motor Disassembly Page 17/20

11. Tweeter Mechanical Drawing& Parts Page 21

12. Tweeter Unit Removal Page 22/24

13. Mid - Range Removal Page 25/28

14. Draw Bar Assembly Removal Page 28/30

15. 5” MF Cabinet Tube Removal Page 30/31

16. Upper and Lower Base Unit Speaker Removal Page 31/32

17. Upper 6” Cabinet Tube Removal Page 33/34

18. Lower 6” Cabinet Tube Removal Page 34/35

19. Terminal Tray Removal Page 36/37

20. HF Crossover Assembly Removal Page 38/40

21. LF Crossover Assembly Removal Page 40/41

22. HF Crossover Drawing & Circuit Page 42

23. HF Parts List Page 43

24. LF Crossover Drawing & Circuit Page 44

25. LF Parts List Page 45

26. Final Functional Test (Stethoscope Examination) Page 45/46

27. Cleaning Page 47

28. Product Test List Page 48

29. Test Result Sheet Page 49/51

Bowers & Wilkins TECHNICAL SUPPORT

The contents of this document and associated files contain confidential information that is propriety to Bowers & Wilkins, and

are intended solely for the purpose of servicing the product. The information is intended for use by service technicians familiar

with electronic products. No part of the contents should be supplied or published elsewhere.

Page 4 of 51 © Bowers & Wilkins 2016

Introduction

Please read this manual carefully before commencing servicing!

Only qualified and authorised technicians should attempt to service this product.

Antistatic Precautions (ESD)

Electronic devices and components are extremely sensitive

to electrostatics (ESD). Always observe ESD precautions

when handling electronic modules or PCBs. Never

exchange boards with a different revision number, unless

authorised by B&W

Always use B&W original type replacement parts.

Whenever you see this

warning, always take

electrostatic precautions.

Chemicals and Solvents (COSHH)

Solder’s, fluxes and cleaning agents are used widely in the

servicing of electronic products. Such substances are

hazardous to health; therefore always take precautions to

protect yourself and others when using any hazardous

substance. Protective clothing and equipment if provided

should be worn. If in doubt refer to the COSHH.

Be aware whenever

you see this warning.

Electricity

Electricity is the most common hazard that will be confronted

when building and testing product.

Always take precautions when working on live equipment or

with any test equipment that uses electricity. Note: Do not

wear an ESD wrist strap when working on live electricity.

Be aware whenever

you see this warning.

Personal Protection Equipment (PPE)

PPE is equipment that will protect the user against health or

safety at work. It can include items such as safety helmets

and hard hats, gloves, eye protection, high visibility clothing,

safety footwear and safety harnesses.

Be aware whenever

you see this warning.

Bowers & Wilkins TECHNICAL SUPPORT

The contents of this document and associated files contain confidential information that is propriety to Bowers & Wilkins, and

are intended solely for the purpose of servicing the product. The information is intended for use by service technicians familiar

with electronic products. No part of the contents should be supplied or published elsewhere.

Page 5 of 51 © Bowers & Wilkins 2016

Technical Sheet

Technical Features: Diamond Tweeter, Continuum Cone FST, Turbine

Head, Aerofoil Cone Bass Units, Flow Port, Optomised

Matrix and Solid Body Tweeter.

Description: 3-way vented-box system

Drive units: 1x ø25mm (1 in) diamond dome high-frequency

1x ø130mm (5 in) Continuum cone FST™ midrange

2x ø165mm (6.5 in) Aerofoil cone bass units

Frequency range: 20Hz to 35kHz

Frequency response: 24Hz to 28kHz (+/-3dB from reference axis)

Sensitivity: 89dB SPL (2.83Vrms at 1m)

Harmonic distortion: 2nd and 3rd harmonics (90dB, 1m on axis)

<1% 70Hz - 20kHz & <0.3% 120Hz - 20kHz

Nominal impedance: 8Ω (minimum 3.0Ω)

Recommended AMP power: 50W - 200W into 8Ω on unclipped programme

Cable Impedance: 0.1Ω cable impedance

Dimensions: Height: 1180mm - Width: 340mm - Depth: 480mm

Net weight: 33Kg (73Ib)

Cabinet & Grille: Rosenut/Black –Gloss Black/Black & Satin White/Grey

Bowers & Wilkins TECHNICAL SUPPORT

The contents of this document and associated files contain confidential information that is propriety to Bowers & Wilkins, and

are intended solely for the purpose of servicing the product. The information is intended for use by service technicians familiar

with electronic products. No part of the contents should be supplied or published elsewhere.

Page 6 of 51 © Bowers & Wilkins 2016

1. Tools and Test Equipment

The tools listed below in Figure: 1 are required to carry out the initial testing and repair of the

804 D3 Speakers, , the specialized tools are included in the 800 Diamond Tool Kit.

1 x HF Retaining Bolt Tool HH37842, 1 x Grill Removal Tool HH37214, 1 x HF Motor

Removal Tool HH15156, 1 x Terminal Nut Runner HH33782, 1 x Hex/Aln Key 3mm,

1 x Phillips Screwdriver, 1 x Facom Screwdriver 4.0x0.8, 1 x Offset Screwdriver

WIHA 224/1-2, 1 x Tyco tool, 1 x Molex Tool, 1 X Mid Extractor Tool HH15121, MF

Adaptor Cap HH15180, 1 x Tommy Bar HH36994, 1 x 6mm Box Spanner, 1 x Torx

T8, 1 x Amplifier, Spring Hook HH15164, 1 x CD Player, 1 x Stethoscope, 1 x Signal

Generator and Gloves.

Required Tools

Figure: 1

HH37214

HH15156

HH37842

HH33782

Tyco Tool

Hex/Alen Keys

Facom 4.0x0.8

WIHA 224/1-2

HH36994

HH15121

HH15180

HH15164

Torx

Tool - 8

Molex Tool

Phillips Screwdriver

6mm Box

Bowers & Wilkins TECHNICAL SUPPORT

The contents of this document and associated files contain confidential information that is propriety to Bowers & Wilkins, and

are intended solely for the purpose of servicing the product. The information is intended for use by service technicians familiar

with electronic products. No part of the contents should be supplied or published elsewhere.

Page 7 of 51 © Bowers & Wilkins 2016

2. Cosmetic Inspection

This is visual check and should be done before any work commences to clarify that

there is no external damage to the 804 D3 Speaker see Figure: 2.

Note: It is recommended that PPE gloves are used for this function.

Check the cabinets

Check both tweeters, Mid - Range & Upper/Lower Base Drivers

Check the Trim Rings

Check both Flow Ports

Check both sets of terminals trays

Terminals

Mid - Range

Figure: 2

Flow Port

Tweeter

Magnetic Trim Ring

Lower Base Driver

Dust Cap

Upper Base Driver

Bowers & Wilkins TECHNICAL SUPPORT

The contents of this document and associated files contain confidential information that is propriety to Bowers & Wilkins, and

are intended solely for the purpose of servicing the product. The information is intended for use by service technicians familiar

with electronic products. No part of the contents should be supplied or published elsewhere.

Page 8 of 51 © Bowers & Wilkins 2016

3. First Functional Test

Confirm the reason for returning the 804 D3 Speakers, carry out a functional test

using the equipment shown below in Figure: 3.

4. Basic-wire Connections to Speakers

B&W 804D3 have speaker wire connections to allow for bi-amplification or bi-wiring.

Connection of a basic audio system where there is only one connection from the

amplifier is very simple and is shown in Figure: 4. Connect the speakers using the

regular left and right speaker wire connections and ignore the second set of terminals.

B&W speakers are shipped with Terminal Links connecting the two sets of terminals

that allow the speaker to be connected as a traditional loudspeaker.

Figure: 3

Terminal Links

Figure: 4

Positive Terminal

Link cable

Input cable from the

amplifier

Negative Terminal

Link cable

Bowers & Wilkins TECHNICAL SUPPORT

The contents of this document and associated files contain confidential information that is propriety to Bowers & Wilkins, and

are intended solely for the purpose of servicing the product. The information is intended for use by service technicians familiar

with electronic products. No part of the contents should be supplied or published elsewhere.

Page 9 of 51 © Bowers & Wilkins 2016

5. Bi-wiring Connections to Speakers

The Bi-wire connection separates the woofer/midrange from the tweeter section.

These two sets of terminals allow the speakers to be split into two independent

sections. The split connects the mid and high frequency drivers to one set of

terminals and the low frequency driver to the other pair. In the bi-wire connection the

Terminal Links are removed and separate sets of speaker wire are run from the

amplifier to each section as shown in Figure: 5.

Connect speakers in the bi-wire mode:

Ensure that your system is powered OFF.

Remove the Terminal Links from speakers (this separates the LPF & HPF).

Connect each amplifier channel to its respective speaker section as shown.

6. Bi-Amplification Connections to Speakers

Bi-amplification is the use of two amplifiers for both speakers with one amplifier

connected to the woofer section of a loudspeaker while the other is connected to the

tweeter section. With this arrangement each amplifier operates over a restricted

frequency range. This restricted range presents each amplifier with a much simpler

job and each amplifier is less likely to "influence" the sound in some way.

Connect speakers in the bi-amplification mode:

Ensure that your system is powered OFF.

Figure: 5

Terminal Links

Removed

Bowers & Wilkins TECHNICAL SUPPORT

The contents of this document and associated files contain confidential information that is propriety to Bowers & Wilkins, and

are intended solely for the purpose of servicing the product. The information is intended for use by service technicians familiar

with electronic products. No part of the contents should be supplied or published elsewhere.

Page 10 of 51 © Bowers & Wilkins 2016

Remove the Terminal Links from each speaker (this separates LPF & HPF).

Connect each amplifier channel to its respective speaker section as shown in

Figure: 6.

Set the level controls on the amplifiers such that the signal will arrive at all speaker

terminals at the same power-volume level. If your amplifiers are identical, it is usually

sufficient to set all the amplifier level controls the same. The speaker's built-in

crossover is designed to match the efficiency of all the individual drivers (tweeters,

midranges, and woofers). When using the bi-amplifier connection you must directly

deal with some of these issues by adjusting levels according to your listening

preference.

The following advice assumes that you have a pre-amplifier and two power amplifiers.

Ideally, the power amplifiers should be identical models. Here are the steps to

connect speakers in the Bi-Amplification mode.

a. Turn everything OFF and wait at least 30 seconds for the power amplifiers to

shut down.

Figure: 6

Terminal Links

Removed

Amplifier 1

Amplifier 2

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