Bang & Olufsen BeoLab 20 Bedienungsanleitung

BeoLab 20

Type 6791 – 6797, 6799

Service Manual - version 1.0

English

German, French, Italian, Spanish, Dutch, Japanese, Korean and

Simpliﬁed Chinese versions are available in the Retail System

This Service Manual must be returned

with the defective parts/back-up suitcase !

82.0

30.4

39.3

CONTENTS

Survey of modules ................................................................... 1.1

How to service ......................................................................... 1.2

Repair tips ................................................................................ 2.1

Fault ﬂow chart ........................................................................ 2.5

Survey of plugs and pins ........................................................ 2.11

Adjustments - Final check after repair ...................................... 3.1

Replacement of modules .......................................................... 4.1

Speciﬁcation guidelines for service use ..................................... 5.1

Block diagram .......................................................................... 6.1

Wiring diagram ........................................................................ 6.3

Available parts ......................................................................... 7.1

Change log:

Ver. 1.0 ................................................................. Original release

Survey of modules 1.1

Survey of modules

02.2

48.2

02.1

35.2

35.1

48.3

48.1

Modules

PCB02.1 Input Panel

PCB02.2 Connector Interface

PCB04 Power Supply

PCB30 Digital Sound Engine

PCB35.1 Amplier

PCB35.2 Amplier

PCB47 LED Indicator

PCB48.1 NTC

PCB48.2 NTC

PCB48.3 NTC

PCB68 Switch Panel

PCB89 Wireless Power Link Rx

Speaker units

Tweeter

Midrange

Woofer

1.2 How to service

How to service

Strategy

This product is to be serviced in the customer’s home.

The repair involves replacement of the module(s). The replaced modules must be

returned for repair at the Bang & Olufsen Module Repair department. Error codes

as well as an adequate fault description must be returned with each replaced part.

For this purpose, use the Exchange Module section in the Retail Order System. To

help the Bang & Olufsen Module Repair department it is very important to answer

the following questions:

1. Which software versions are used in the product?

2. What happens in the actual situation?

3. Error code, the error code contains data that may be used for repairing the

module(s) and must be returned with the defective module(s).

Handling the error code (error log).

a. Make a note of the error code on the Exchange Module section and print it.

b. Use the error code when troubleshooting.

c. Return the error code in the Retail Order System.

d. Before returning the product to the customer, clear the error code.

Preparations before service

Fault explanation and demonstration

Before troubleshooting is initiated, let the customer demonstrate the fault, if

possible.

Recommended tools for service

- Bang & Olufsen ServiceTool

- Static-protective ﬁeld service

- White gloves

- Shoe covers

- Soft lint-free cloth for cleaning

- WiSpy (Wi-Spy DBx + Chanalyzer Pro)

- Product cover

- Protection stocking to protect the tweeter assembly and decoration ring

Final check after repair

The ﬁnal check after repair describes the activities that are needed to ensure the

product will be returned in perfect condition to the customer.

Please refer to ‘Final check after repair’ section on page 3.6.

How to service 1.3

Warnings when handling

Static electricity

Static electricity may damage the product.

Static-protective ﬁeld service kit

A static-protective ﬁeld service kit must always be used when the product is

disassembled or modules are being handled, since the internal electronics are very

sensitive to static electricity.

Follow the instructions in the Service Manual and use the ESD-mat for both old

and new modules.

When mains voltage on the product is required, remove the connection between

the product and the ESD-mat. This is important to avoid getting injured by mains

voltage.

STATIC ELECTRICITY

MAY DESTROY THE

PRODUCT

ESD

ESD-Mat

Waste of Electrical and Electronic Equipment (WEEE)

Electrical and electronic equipment, parts and batteries marked with this symbol

must not be disposed of with normal household wastage; all electrical and

electronic equipment, parts and batteries must be collected and disposed of

separately.

Management methods for controlling pollution caused by Electronic Information Products

Component

name:

Hazardous substance

Pb Hg Cd Cr(VI) PBB PBDE

Aluminum parts ×ooooo

PCBA ×ooooo

Symbols used in the charts:

o Indicates all homogeneous materials’ hazardous substances content are below the

ST/T 11363–2006 MCV limit.

× Indicates that the hazardous substance content contained in any one of the

homogeneous materials of the part exceeded the MCV limits speciﬁed in the

standard SJ/T 11363-2006.

1.4

Repair tips – Fault ow chart 2.1

Repair tips

Check cables .................................................................................... 2.2

Check for newest SW ....................................................................... 2.2

Backup ............................................................................................. 2.2

Restore ............................................................................................. 2.2

Error Log .......................................................................................... 2.2

Autocalibrate .................................................................................... 2.2

LED indicator .................................................................................... 2.2

Description of LED indications ........................................................... 2.2

Product Information - Usage data ..................................................... 2.3

NTC module test ............................................................................... 2.3

Speaker unit test ............................................................................... 2.4

Sound test ........................................................................................ 2.4

Fault ow chart

No function and no LED indication .................................................... 2.5

LED indicator is ashing quickly orange ............................................. 2.7

No sound from speaker in a wired setup ........................................... 2.8

No sound from speaker in a wireless setup ........................................ 2.9

Missing, atttenuated or distorted sound from speaker and no error

indication in error logs .................................................................... 2.10

Survey of plugs and pins ................................................................. 2.11

2.2 Repair tips

Repair tips

Check cables

Always check all external cables as well as internal cables.

Check for newest SW

Always ensure to have the newest software version installed. This is done via the

ServiceTool. Select BeoLab 20 > Software > Automatic Software Update.

The ServiceTool also includes noise and sound sources for testing.

Backup

Before starting the fault nding activity make a complete backup of the product by

means of the ServiceTool (see under Repair > Chassis and follow the instructions).

Restore

After the fault nding activity make a complete restore of the product by means of

the ServiceTool (see under Repair > Chassis and follow the instructions).

Error Log

If an error occurs in the product it is recorded and saved in the error log. The error

log may be helpful in troubleshooting situations. Use the ServiceTool to read out

the error log.

Autocalibrate

Use the ServiceTool > Adjustments > Adjustments > Autocalibrate to check

the amplier output if sound is missing, attenuated or distorted and the error log

doesn’t give a useful explanation. If the autocalibration fails the error can be

located to an error in either the Digital Sound Engine, the amplier modles or the

connection in between. If the autocalibration is successful and sound is still faulty,

it is most likely caused by a speaker driver error or a faulty connection between

amplier modules and speaker drivers.

LED indicator

The LED at the top of the speaker indicates the state of the

product by changing colour (red/orange/green), ashing or

solid. If errors occur during operation, the product will enter an

error state and the LED will start ashing quickly orange.

Description of LED indications

Constant Flashing slowly Flashing quickly

Green Product switches On (10

sec. duration)

Software update is

on-going

Associate mode (only in wireless mode:

ready for pairing)

Orange --The product is failing. The product will

not revert to normal operation. In some

cases it can be resolved by disconnecting/

connecting the mains:

This could be:

- NTC is defective or disconnected.

- Digital Sound Engine is overheating.

- Calibration failed or has not been done

(ashing quickly orange/green).

Red The product is connected

to mains, the product is

switching off or the

product restarts after a

reset.

Not used Not used

Repair tips 2.3

Product Information - Usage data

Usage data is logged in the product which can be very useful information in

troubleshooting situations. Use the ServiceTool to read out the usage data.

Approach (ServiceTool)

Connect a service PC with ServiceTool. Follow the procedure below:

- Connect the ServiceTool to the SERVICE connector on the product as shown:

- Run ServiceTool.

- Be sure that ServiceTool is updated to the latest version. If not, upgrade and restart

ServiceTool.

- Select COM port - ATI COM port

- Scroll down to BeoLab section.

- Select BeoLab 20 and click Launch.

- Click on the PRODUCT tab (if not already shown).

- Click + next to each item to expand the menus.

- Click System Info -> Product ID (the information screen appears).

- Click the Read button and conrm that product data is read out on the screen.

This indicates successful communication between the product and the service PC.

NTC module test

Measure the resistance of the NTC module to determine if

the fault is caused by a defective speaker unit or the NTC

module.

It is recommended to measure on the terminals on the

back of the speaker unit. The NTC module must be

disconnected from the product.

The resistance of the NTC module at 22ºC (72ºF) is approximately 470 kΩ.

If the NTC module is outside the limits, it is defective and must be replaced.

I/O

FREE

WALL

CORNER

ROLE POS.

RESET

POWER LINK R-INPUT-L IN-TOSLINK-OUT SERVICE

2.4 Repair tips

Speaker unit test

Measure the DC resistance of the speaker unit to determine if the fault is caused

by a defective speaker unit. It is recommended to measure on the terminals on the

speaker unit. The speaker units must be disconnected from the product.

Speaker unit Impedance Nominal resistance Limits

Tweeter 8 Ω 6.7 Ω ± 15%

Midrange 8 Ω 6.2 Ω ± 15%

Woofers *) 2 × 6 Ω 2 × 5.9 Ω ± 15%

*) Each Woofer has two coils.

If the speaker unit is outside the limits, it is defective and must be replaced.

Under normal conditions it is not necessary to replace the gaskets on the speaker

unit, unless they have been damaged by accident.

Sound test

It is possible to test each speaker unit/amplier to check the sound quality, and

determine whether the devices are faulty or healthy. For this purpose use ServiceTool

and refer to the test section.

The Sound Test section features a sound generator which allows the user to send

a pure sound directly to the speaker unit. This feature makes troubleshooting or

testing more easy and targeted.

- Run ServiceTool.

- Be sure that ServiceTool is updated to the latest version. If not, upgrade and restart

ServiceTool.

- Scroll down to BeoLab section.

- Select BeoLab 20 and click Launch.

- Click on the PRODUCT tab (if not already shown).

- Click + next to each item to expand the menus.

- Click Test -> Test Sound (the information screen appears).

- Follow the procedure in Service Tool.

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