Bang & Olufsen BeoLab 9 6217 User manual

BeoLab 9
Type 6217
Service Manual
English
German, French, Italian, Spanish, Danish, Dutch and Japanese versions
are available in the Retail System
This Service Manual must be returned
with the defective parts/back-up suitcase !

CONTENTS
Survey of modules .................................................................... 1.1
How to service .......................................................................... 1.2
Fault flow chart ......................................................................... 2.1
Adjustments ............................................................................. 3.1
Repair tips ................................................................................. 3.2
Final check after repair .............................................................. 3.3
Replacement of modules ........................................................... 4.1
Specification guidelines for service use ...................................... 5.1
Block diagram ........................................................................... 6.1
Wiring diagram ......................................................................... 6.3
Available parts .......................................................................... 7.1

PCB1 Cross Over
PCB2 LC-Filter
PCB3 LED
PCB4 Power Supply
PCB5 ICEpower Amplifier
PCB7 NTC
999Module Chassis complete, incl. PCB1, PCB2, PCB5
4
999
7
3
Survey of modules
Survey of modules 1.1

How to service
Strategy
BeoLab 9 has been split-up into as few service items as possible. Each service-
friendly item is packed individually, prepared for worldwide transport, and has a
separate seven digit spare part number to be found in the Bang & Olufsen Retail
System or the Service Manual. An exploded view drawing shows the service spare
parts.
The back-up suitcase holds all necessary electrical modules for front-line repair of
one loudspeaker in e.g. the customers home.
Cabinet parts must be brought with you separately, if to be replaced in the
customers home.
An adequate fault description must be returned with each replaced part. For this
purpose, use the Module Repair form or the form in the Retail Order System under
Exchange Module. To help the Bang & Olufsen Module Repair department it is
very important to answer the following questions:
1. Which products are in the setup?
2. Which software versions are used in these products?
3. How are the products linked together?
4. What happens in the actual situation?
All service repair will be on module level by means of the back-up suitcase.
Service Manuals in other languages can be found in the Retail System as PDF-files.
Preparations before service
Always remember to download the latest version of the Service Manual.
Fault description must be returned with the replaced parts.
Use the Module Repair form or the form in the Retail Order System, Exchange
Module.
Fault explanation and demonstration
Before troubleshooting is initiated, let the customer demonstrate the fault, if
possible.
Recommended tools for service
White gloves.
Soft lint-free cloth.
Multimeter.
1.2 How to service

Handling and cleaning
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.
Follow the instructions in this Service Manual and use the ESD-mat for both old
and new modules.
Please note:
When mains voltage on the product is required, remove the connection between
the product and the ESD-mat.
The chassis or modules must always be connected to the static-protective field
service kit or placed in an ESD-proof bag.
Symbol of safety components
When replacing components with this symbol, the same type has to be used, also
the same values for ohm and watt.
The new component is to be mounted in the same way as the replaced one.
Transport and handling
It is recommended to:
- use the product cover when transporting the product.
- do not move the product when it is operating.
Cleaning
Please refer to the chapter “Final check after repair” or the User’s guides.
STATIC ELECTRICITY
MAY DESTROY THE
PRODUCT
ESD
How to service 1.3

1.4

Fault flow chart 2.1
Fault flow chart
No red light in STANDBY ...................................................... 2.2
No sound, but green LED is OK ............................................ 2.4
No sound from woofer, but tweeter and midrange is OK ..... 2.4
No sound from midrange, but tweeter and woofer is OK ..... 2.5
No sound from tweeter, but midrange and woofer is OK ..... 2.5
No function of the PCB7, NTC ............................................. 2.6
No function of S1 and S2 ..................................................... 2.6

2.2 Fault flow chart
Fault symptom:
- No red light in STANDBY
Possible causes:
- Fuse F1
- PCB4, Power Supply
- Module 999, Amplifier
Connect a Master Link cable from e.g. a
BeoSound 4, to BeoLab 9. Make sure that S101
is set to either L or R. Connect mains to BeoLab 9.
Is there red light in the LED on top of BeoLab 9?
Reconnect mains
Confirm mains on
PCB4, Power Supply
P13 pin1 and 2
If possible, check fuse
F1 on PCB1, Cross
Over
Replace fuse F1
Replace PCB4, Power
Supply
Confirm 4.2V on
PCB1, Cross Over P9
pin 2
Replace Module 999,
Amplifier
Replace PCB3, LED
No
Yes
Confirm 5V on PCB4,
Power Supply P14
pin1
Confirm mains in the
mains wire
Note:
Ground is
chassis

Fault flow chart 2.3
Select e.g. Radio or
CD on the
Audiomaster, and
press GO on Beo4
Does BeoLab 9 turn
on (Green light in
LED)
Confirm 5V on PCB4,
Power Supply P14 pin
7
Check Power Link
cable and
Audiomaster.
Reconnect/replace if
nescessarry.
(This is not covered in
this fault flow chart)
Confirm -12V on
PCB4, Power Supply
P14 pin 3
Replace PCB4, Power
Supply
Replace PCB4, Power
Supply
No
Yes
Confirm 44V on PCB4,
Power Supply P15
pin 4
Replace PCB4, Power
Supply
Confirm -44V on
PCB4, Power Supply
P15 pin 5
Go to
next page
Confirm 12V on
PCB4, Power Supply
P14 pin 5
Replace PCB4, Power
Supply
Confirm 66V on
PCB4, Power Supply
P15 pin 6
Replace PCB4, Power
Supply
Confirm approx 4.7V
on PCB4, Power
Supply P14 pin 9
Replace PCB4, Power
Supply
Replace Module 999,
Amplifier

2.4 Fault flow chart
Fault symptom:
- No sound, but green LED is OK
Possible causes:
- Module 999, Amplifier
Is there no sound, but the green LED is OK?
Go to box
further down
on page
Replace Module 999,
Amplifier
From above
No
Yes
Note:
It wil give the best result if it is possible to
use an audio test CD with pure sine waves
and an oscilloscope, when measuring on
the woofer or midrange.
Warning:
Be very careful, when measuring on the
woofer, because there is approx 35Vdc on
both input terminals. Make sure to use a
differential probe, or make sure that the
oscilloscope and the product is not
connected to earth.
Fault symptom:
- No sound from woofer, but tweeter and
midrange is OK
Possible cause:
- Woofer
- Module 999, Amplifier
Turn volume on the Audio Master up to 50.
Confirm an AC-Sound signal by means of the
Bar-graph on the multimeter or an oscilloscope,
when measuring across the woofer input
terminals.
From previous
page
Visual confirm cable
connection between
woofer and Module
999, Amplifier
Reconnect/replace
cable
Remove mains from the
product. Remove the black wire
from the woofer. Measure the
resistance across the woofer
terminals:
Approx 2.9 ohm?
Replace woofer Replace Module 999,
Amplifier

Fault flow chart 2.5
Fault symtom:
- No sound from midrange, but tweeter and
woofer is OK
Possible cause:
- Midrange
- Module 999, Amplifier
Turn volume on the Audio Master up to 50.
Confirm an AC-Sound signal by means of the
Bar-graph on the multimeter or an oscilloscope,
when measuring across the midrange input
terminals.
Note:
It wil give the best result if it is possible to
use a audio test CD with pure sine waves
and an oscilloscope, when measuring on
the woofer or midrange
Visual confirm cable
connection between
midrange and Module
999, Amplifier
Reconnect/replace
cable
Remove mains from the
product. Remove the black
wire from the midrange.
Measure the resistance across
the midrange terminals:
Approx 6.1 ohm?
Replace midrange Replace Module 999,
Amplifier
Fault symtom:
- No sound from tweeter, but midrange and
woofer is OK
Possible cause:
- Tweeter
- Module 999, Amplifier
Turn volume on the Audio Master up to 50.
Confirm an AC-Sound signal by means of the
Bar-graph on the multimeter or an oscilloscope,
when measuring between PCB1, Cross Over
P10 pin 1 and ground.
Visual confirm cable
connection between
tweeter and Module
999, Amplifier
Reconnect/replace
cable
Remove mains from the
product. Remove the connector
on PCB1, Cross Over P10.
Measure the resistance
between the orange and white
wire:
Approx 6.6 ohm?
No
Yes
Replace tweeter Replace Module 999,
Amplifier

2.6 Fault flow chart
Fault symptom:
- No function of the PCB7, NTC
Possible cause:
- PCB7, NTC
- Cable W4
- Module 999, Amplifier
Is the loudspeaker in
protection mode?
Visual confirm cable
connection between
Module 999, Amplifier
and PCB7, NTC
Reconnect/replace
cable Replace PCB7, NTC Replace Module 999,
Amplifier
To confirm correct operation of the NTC, measure
approx. 9.35V DC at normal room temperature, as
shown in fig 1
(When the temperature is rising, the DC voltage is
going towards 0)
Note:
When the loudspeaker goes into protection mode,
it is nescessarry to disconnect mains and wait one
minute before connecting it again.
Fault symptom:
- No function of S1 and S2
Possible cause:
- Module 999, Amplifier
Is there no function of
switch S1 and/or S2?
Replace Module 999,
Amplifier
No
Yes
Fig1
Red Black

Adjustments
Adjustments described
Speaker driver adjustment.
The speakers are individually measured and the speaker driver must be adjusted
accordingly.
Adjustment must be performed when either speaker or speaker driver is replaced.
Access to adjustment points
The adjustment points are placed on the socket panel on the back of the product.
Speaker adjustment table
Adjustments 3.1
1
2
3
4
5
6
7
8
9
0
+
1
2
3
4
5
6
7
8
9
0
+
1
2
3
4
5
6
7
8
9
0
+
TW MR WO
TW: Tweeter
MR: Midrange
WO: Woofer
Speaker value from Switch position
label on speaker
1.8 – 2.3 0
1.3 – 1.7 1
0.8 – 1.2 2
0.3 – 0.7 3
-0.2 – 0.2 4
-0.3 – -0.7 5
-0.8 – -1.2 6
-1.3 – -1.7 7
-1.8 – -2.2 8
-2.3 – -2.5 9

Power Link
MK III
Repair tips
Hum in speaker when no music is played
The Power Link cable must be of type MK III or higher.
The ground connection in Power Link cable lower than MK III may be insufficient
for optimum sound performance.
Standby LED
The standby LED indicates the status of the BeoLab 9.
Standby LED STATUS
Red BeoLab 9 is in standby.
Green BeoLab 9 is operating.
Orange BeoLab 9 is shut down due to thermal overload.
If the LED Status is orange, turn off and disconnect the product from the mains.
Wait for minimum 5 minutes for the speaker to cool down.
Connect mains and turn on BeoLab 9.
If the LED status still is orange the fault may be due to:
1. Woofer protection – perform speaker check.
2. Tweeter protection – perform speaker check.
3. Midrange protection – perform speaker check.
4. NTC-board or connection on one of the woofers.
Access the NTC-board by dismantling the woofer.
4. Power supply failure.
3.2 Repair tips

Final check after repair
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.
The content is:
– Insulation test.
– Restore setup.
– Final cleaning of the product.
Insulation test
The product must be insulation tested after having been dismantled. Make the
test when the set has been reassembled and is ready to be returned to the
customer.
Flashover must not occur during the test.
Make the insulation test as follows:
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 to ground on the Power Link socket.
NOTE!
To avoid damaging the product it is essential that both terminals of the insulation
tester have good contact.
During the test the current must not exceed 5 mA.
Slowly increase the voltage on the insulation tester until a voltage of 2.5 kV (ac) is
obtained. Maintain the voltage level for one second, then slowly decrease the
voltage to 0 V (ac).
Restore setup
Ensure that,
– The F/W/C switch is in correct position.
– The plug is inserted over the standby LED.
– The Power Link cable is a MK III or higher.
Check sound
Ensure that all speakers are OK.
Clean the product
Clean dusty surfaces using a dry soft cloth. If necessary, remove grease stains or
persistent dirt with a lint-free, firmly wrung cloth, dipped in a solution of water
containing only a few drops of mild detergent such as washing-up liquid.
The loudspeaker front grill may be cleaned with a vacuum cleaner with a soft
brush nozzle, and set to the lowest level.
Final check after repair 3.3

3.4

4.1Replacement of modules
Replacement of modules
Modules that can be replaced
BeoLab 9 in service position ....................................... 4.2
Replace PCB3, LED ..................................................... 4.4
Replace PCB4, Power Supply ...................................... 4.6
Replace 999Module, Amplifier ................................... 4.7
Replace tweeter ......................................................... 4.9
Replace midrange .................................................... 4.11
Replace woofer ........................................................ 4.12
Replace rubber foot ................................................. 4.13
Warning – Static electricity
Static electricity may damage the product.
A static-protective field service kit must always be used when the product is
disassembled or modules are being handled.
Notice!
All modules must be placed on the ESD-mat or in an ESD-proof bag.
Purpose of replacement of modules
Short instructions for replacement of the available modules, with reference to
additional illustrations:
- The correct sequence for replacing modules.
- Text and illustrations.
- Reference to adjustment.
Modules that do not require any special procedure may be shown as only
illustrations.
After replacement of drivers
After replacing a driver, see Adjustments and Repair tips.
ESD
ESD-Mat

4.2 BeoLab 9 in service position
- Remove cables connected to BeoLab 9
- Remove cover
2x
3mm
- Remove cover, top
- Remove screws for lens
- Use Special tool
3x
2.5mm

4.3
BeoLab 9 in service position
- Gently lift off lens
- Pull off fabric frame

4.4 Replace PCB3, LED
- Remove cables connected to BeoLab 9
- Remove cover
2x
3mm
- Remove cover, top
- Remove screws for lens
- Use Special tool
3x
2.5mm