Bang and Olufsen Beolab 3 Service manual

BeoLab 3

Type 6881, 6882, 6883, 6884, 6885, 6886, 6887, 6888
from serial no. 19355490

Service Center repair guide
English

CONTENTS

How to service, Warnings, PIN code protection .......................................... 1

English ................................................................................................ 1.1

German .............................................................................................. 1.3

French ................................................................................................ 1.5

Italian ................................................................................................. 1.7

Spanish ............................................................................................... 1.9

Danish .............................................................................................. 1.11

Nederlands ....................................................................................... 1.13

Japanese ........................................................................................... 1.15

Specication guidelines for service use ....................................................... 2

Diagrams ........................................................................................................ 3

Overall block diagram ......................................................................... 3.1

Wiring diagram ................................................................................... 3.2

Available parts ............................................................................................... 4

Service tips, Replacements, Cleaning ........................................................... 5

English ................................................................................................ 5.1

German .............................................................................................. 5.3

French ................................................................................................ 5.5

Italian ................................................................................................. 5.7

Spanish ............................................................................................... 5.9

Danish .............................................................................................. 5.11

Nederlands ....................................................................................... 5.13

Japanese ........................................................................................... 5.15

Disassembly .................................................................................................... 6

Insulation test ................................................................................................ 7

English ................................................................................................ 7.1

German .............................................................................................. 7.2

French ................................................................................................ 7.3

Italian ................................................................................................. 7.4

Spanish ............................................................................................... 7.5

Danish ................................................................................................ 7.6

Nederlands ......................................................................................... 7.7

Japanese ............................................................................................. 7.8

There is no Brief operation guide in this Service Center repair guide.
Instead an english version of the user guide is enclosed the back-up suitcase.

How to service

Front line service

BeoLab 3 must be serviced in the customers home when it comes to electrical
symptoms or exchange of mechanical parts. In this way you avoid having to make
more than one visit and using minimum of time on the case, all for the benet of
the customer.
The loudspeaker dimensions are H-215mm, W-135mm, L-162mm, 2,55 kg and
the carbon box for two loudspeakers are H-350mm, B-360mm, D-380mm, 6,5 kg.
In the customers house it is possible to replace :
The electrical parts :
The loudspeaker units
The passive radiators
The complete main chassis
The standby LED PCB
The mechanical parts :
The lens for the tweeter
The cabinet
The foot

A sound level adjustment procedure is necessary when replacing one or more
loudspeaker units, or replacing the main chassis. This is done easily be means of
click potentiometers.
Replacements of the cabinet can be done at the customers as it consist of a
complete cabinet with gaskets and other materials there are needed when
exchanging the complete cabinet. Only the lens, the loudspeaker units, the main
chassis and the foot must be put onto the new cabinet.

Back-up Suitcase

The service Back-up Suitcase will contain all needed electrical parts, that is needed
to service a failing speaker. All mechanical parts must be ordered separately from
B&O Struer DK. All the needed tools and a Service Center Repair Guide will be
found in the suitcase.

Converting mains voltage supply

If it is necessary to change voltage supply, e.g. when moving between two
countries, this can be done easily in the BeoLab 3 speakers (on module 01 – P504).
You will only need to mount/remove a jumper. The fuse will be a global type, so
here is no need for replacement. Remember to order new mains cables.
See illustration on page 6.11

Type survey

Variants Type Jumper P504 Mains cable

EU 6891 NOT mounted 6100273
GB 6892 NOT mounted 6200327

US/CDN 6893 Mounted 6100307

JAP 6894 Mounted 6100331
AUS 6895 NOT mounted 6100332
KOR 6896 NOT mounted 6100386

How to service, English 1.1

1.2 Warnings – PIN code protection, English

STATIC ELECTRICITY
MAY DESTROY THE
PRODUCT

Warnings

ESD

When electrical replacements or disassembly is taking place use an ESD-mat. The
internal electronic are very sensitive to static electricity.

General warnings

Wear cotton gloves to avoid any ngerprints on the product.

The surfaces on the product is very sensitive, so handling should be done with
great care to avoid damage.

Cleaning of the speaker surfaces should only be done a lint-free cloth, which you
have dipped in lukewarm water and wrung rmly.

When doing disassembly small aluminum chips can occur when screws are
removed. Make sure all these small aluminum chips are removed from the speaker
cabinet before assembly is done. These aluminum chips can resolve in internal
shortcuts, and damage the Main chassis badly, if not removed.

If the speaker needs to be transported, a product cover can be ordered from B&O
(ordrenr. can be found in the back of this guide)

Specication guidelines for service use BeoLab 3

Type no. 6891 Europe – 230V
Type no. 6892 England – 230V
Type no. 6893 USA, Canada – 120V
Type no. 6894 Japan – 100V
Type no. 6895 Australia – 240V
Type no. 6896 Korea – 220V

Dimensions for one speaker Height – 215mm (223mm on foot)
Width – 135mm
Length – 162mm
Weight – 2,55 Kg

Box for two loudspeakers Height – 350mm
Width – 360mm
Depth – 380mm
Weight – 6,5 Kg

Input sensitivity
Power Link 125mV – 88dB SPL
Line in (via Power Link socket, pin 3) 125mV – 88dB SPL (auto switch on)
Switch off time 3 min.

Maximum Sound Pressure Level 94 dB (Stereo, pair)
Power Ampliers 2 (Class D ICEpower)
Power amplier, bass 125 Watts, Class D, ICEpower
Power amplier, treble 125 Watts, Class D, ICEpower
Long Term Maximum, output per amplier Bass : 220 Watts (4 Ohm)
Treble : 120 Watts (8 Ohm)

Effective Frequency range 50 – 20.000 Hz
Crossover frequency 3300 Hz
Cabinet principle Double passive radiator system
Magnetically shielded Yes
Net volume, bass 1.5 litres

Woofer 4” (101,6 mm)
Passive radiators 2 x 4” (101,6 mm)
Treble ” (19mm)

Directivity control Treble *Acoustic Lens Technology
Bass equalization ABL (Adaptive Bass Linearization)
Protection Thermal protection

Connections
Power Link - input 1 (PL MKIII Semi-Balanced)
Mains – input 1
LINE in – input (via Power Link socket – pin3) 1 (auto switch on)

Indication 1 tri-color LED
Green On
Red Stand-by
Orange Protection (see “Service Hints”)

Operations
Switch for : Left – Right – LINE
Switch for : Wall – Corner – Free

Power consumption Typical : 7 Watts
IEC65 : 20 Watts
Stand-by : 0.2 Watts

*ALT (or Acoustic Lens Technology) is licensed from Sausalito Works LLC.

Specication guidelines for service use 2.1 2.1 2.1

3.1 Overall block diagramOverall block diagram 3.13.1

Overall block diagram

3.2 Wiring diagramWiring diagram 3.2 3.2

Wiring diagram

6

4.1 Available partsAvailable parts 4.1

4.1

Available parts
BeoLab 3

9001

9002

9004

9005

9006

9007

9008

9009

9010

9011

9012*

9013

9014

9015

9015

Incl. pos. no. 9003

9003

Incl. pos. no. 9005

Incl. pos. no. 9007

9018

9018

9019

9020

9016

9017

9015

9026

9027

9028

9022

9024

9018

9019

9021

9025

9012*

5

999

6

1

1

1

1

1

1

2

2

2

2

2

3

3

3

3

3

3

3

3

3

3

3

3

4

5

6

7

8

9012*

Consist of pos. nos.
9009, 9011, 9013, 9014, 9015,
9022, 9023, 9024, 9025

9023

Available parts 4.2

Top plate

Acoustic lens w/ lt

Tweeter cover w/gasket

Tweeter 19mm w/gasket

Thermal conductive rubber

Thermal conductive rubber

Woofer

Wire holder

8052223

Washer

Wire bundles

Wire bundle, PCB2 - PCB5

Wire bundle, PCB3 - PCB5

Wire bundle, PCB3 - PCB6

3395305

Accessories

Available documentation

Available parts 4.4

Tube

9501

Incl. pos. no. 9006

9502

9503

9504

9505

9506

Table stand 2166

Tube

9512

9513

9511

9510

Wall bracket 2167

9521

9520

9522

9520

Service hints and adjustment

Service Hints

Doing fault searching, the BeoLab 3`s LED can give you a hint.
If the LED turns orange in colour it can be a result of a thermal shutdown, remove
the mains and let the speaker cool down. If the LED still light orange when the
mains is connected again, then it is a indication of an internal error.

A internal error indication can be caused by many things, but the most likely is
listed below.

1. The NTC module on the bass driver unit is not connected to the Main chassis, the
plug is disconnected.

2. Tweeter unit is failing (How to measure the driver units is described later on this
page)

3. Bass unit is failing (How to measure the driver units is described later on this page)

4. Error in Switch Mode Power Supply

How to measure the Driver units (treble/bass), using a Ohm-meter :

Dismantle the speaker to get access to the driver unit you want to measure.

Disconnect the unit completely

Measure with an Ohm-meter

The bass unit should be 4,0 Ohm +/- 10% (between 3,6 - 4,4 Ohm)

The treble unit should be 6,4 Ohm +/- 10% (between 5,7 - 6,9 Ohm)

If the measurements are below the – 10% value, it indicates that the driver unit
coil is shortcut.

If the measurements is over the + 10% value, it indicates that the driver unit coil is
disconnected.

Adjustment after driver unit or Main chassis replacement

When a driver or a Main chassis is replaced, the driver unit levels needs to be
adjusted, so the speaker once again is in accordance with specications.

The adjustment is done with two click-potentiometers, one for treble level
adjustment and one for bass level adjustment. Each potentiometer haves 10 step
(10 * 0,5 dB) and is located on module 03, on the Main chassis.

Service hints and adjustment, English 5.1

Tweeter

Woofer

Remove the left slave unit, to gain access to the potentiometers.

When the Main chassis is replaced, the potentiometers on the new chassis are set
to the same value (click) as the old chassis. No further adjustment is used, as long
as the driver units not have been replaced.

When a driver unit is replaced, either treble or bass, you will need to perform an
adjustment on the two potentiometers. On the new service driver unit there will
be a dB value stated on the back. This value is used along with the table below to
adjust the correct potentiometer.

Bass adjustment (the lower potentiometer)

Stated value on the

service driver unit

Position of the click-

potentiometer

3,5 - 3,8 0
2,6 - 3,4 1
1,8 - 2,5 2
1,1 - 1,7 3
0,4 - 1,0 4

-0,3 - 0,3 5 (0 dB level)

-0,4 - -0,9 6

-1,0 - -1,7 7

-1,8 - -2,4 8

-2,5 - -2,8 9

Treble adjustment (the upper potentiometer)

Stated value on the

service driver unit

Position of the click-

potentiometer

3,1 - 3,7 0
2,4 - 3,0 1
1,7 - 2,3 2
1,0 - 1,6 3
0,4 - 0,9 4

-0,3 - 0,3 5 (0 dB level)

-0,4 - -0,8 6

-0,9 - -1,5 7

-1,6 - -2,2 8

-2,3 - -2,7 9

5.2 Service hints and adjustment, English

6.1

BeoLab 3 in serviceposition

BeoLab 3 in serviceposition

1

2

3

4

1

2

1x

TX10

6.2

Replace Top plate

Replace Top plate

1

6.3

Replace Acoustic lens

2

1

Replace Acoustic lens

See page 6.1, BeoLab 3 in serviceposition

See page 6.2, Remove Top plate

2x

TX15

6.4

Replace tweeter cover

Replace tweeter cover

See page 6.1, BeoLab 3 in service position

See page 6.2, Remove Top plate

See page 6.3, Remove acoustic lens

1

6.5

Replace Tweeter

Replace Tweeter

See page 6.1, BeoLab 3 in service position

See page 6.2, Remove Top plate

See page 6.3, Remove acoustic lens

See page 6.4, Remove tweeter cover

2

1

3x

TX15

2x

ESD

ESD-Mat

6.6

Replace Bezel

Replace Bezel

See page 6.1, BeoLab 3 in service position

1

2

6.7

Replace woofer

2

1

Replace woofer

See page 6.1, BeoLab 3 in serviceposition

See page 6.6, Remove Bezel

4x

TX10

3x

ESD

ESD-Mat

Replace passive radiator

Replace passive radiator6.8

2

1

See page 6.1, BeoLab 3 in serviceposition

See page 6.6, Remove Bezel

4x

TX10

3x

ESD

ESD-Mat

Replace PCB 5

2

1

See page 6.1, BeoLab 3 in serviceposition

See page 6.2, Remove Top plate

1x

TX30

2x

See page 6.3, Remove Acoustic lens

See page 6.4, Remove Tweeter cover

Replace PCB 5 6.9

See page 6.6, Remove Bezels

See page 6.7, Remove Woofer

See page 6.8, Remove Passive radiators

5P15

5P17

PCB 5

ESD

ESD-Mat

Replace main chassis

2

1

6.10

Replace Main chassis

See page 6.1, BeoLab 3 in serviceposition

See page 6.2, Remove Top plate

See page 6.3, Remove Acoustic lens

See page 6.4, Remove Tweeter cover

See page 6.5, Remove Tweeter

See page 6.6, Remove Bezels

See page 6.7, Remove Woofer

See page 6.8, Remove Passive radiators

2x

5P15

5P17

5x

TX15

ESD

ESD-Mat

1x

6.11

Converting mains voltage supply

Converting mains voltage supply

See page 6.10, Remove main chassis

Insulation test

BeoLab 3 must be insulation tested if it has been dismantled.
Make the test when the BeoLab 3 is reassembled and is ready to be returned to
the customer.

Insulation test at the Service center

Short-circuit the two pins of the mains plug and connect them to one of the
terminals of the Insulation tester. Connect the other terminal of the insulation
tester to ground on the Power Link socket.
To avoid damaging the BeoLab 3, it is essential to ensure that both terminals of
the insulation tester have good contact.
Slowly turn up the voltage control of the insulation tester until a voltage of 2.5kV(ac) is
obtained.
Maintain that voltage level for one second, then slowly turn it down again.
During the testing the current must not exceed 5mA.

Insulation test at the customer

Remove the mains cable from the wall outlet.
Place a jumper across the two AC plug prongs.
Use a multi-meter, set for measurements in the Ohm-area.
Place one lead from the multi-meter on the AC plug and place the other lead on
ground at the Power Link plug.
The resistance during this measurement must be of 1 Mega Ohm or more.
Resistance measured below 1 Mega Ohm indicates an abnormal situation and
corrective action must be taken.

Please note:

Avoid all skin contact with the AC plug and all other metal parts while performing
the test, as this contact may inuence the measurement.

Insulation test, English 7.1

Bang & Olufsen
DK-7600 Struer
Denmark

Phone [phone]*
Fax [phone]

3538052 06-06