Bang & Olufsen BeoLab 7-1 User manual

BeoLab 7 – 1
Type 6210, 6212
Service Manual
English
German, French, Italian, Spanish, Danish and Dutch versions
are available in the Retail System
This Service Center repair guide must be
returned with the defective parts/back-up
suitcase !

1
How to service .............................................................. 2
Repair tips .................................................................... 3
Replacement of spare parts ........................................... 4
Adjustments ................................................................. 5
Final check after repair .................................................. 6
Illustrations .................................................................... 7
Specification guide lines .............................................. 14
Overall block diagram .................................................. 16
Wiring diagram .......................................................... 17
Available parts ............................................................ 18
Contents
There is no Brief operation guide in this Service Manual. Instead an english version
of the User Guide is enclosed in the back-up suitcase

2
How to service
Strategy
The speaker is to be serviced in the customer’s home.
The static–protective field service kit must always be used when the product is
disassembled or modules are being handled.
The repair involves replacement of modules or speaker units, which are supplied in
the Back-up suite case.
The replaced modules must be returned for repair at Bang & Olufsen, Module
Repair Department.
Fault description must be returned with the replaced modules.
Use the Module Repair form or the form in the Retail Order System, Exchange
Module.
Preparations before service
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.
Handling and cleaning
Static electricity
Static electricity may damage the speaker.
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 the 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 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 value for ohm and watt.
The new component is to be mounted in the same way as the replaced one.
Cleaning
Please refer to the chapter “Final check after repair” or use the User’s guide.
STATIC ELECTRICITY
MAY DESTROY THE
PRODUCT
ESD
How to service

3
Repair tips
Repair tips
Hum in loudspeaker when no music is played.
The Power Link cable must be of type MK 3 or higher.
The ground connection in Power Link cable lower than MK 3 may be insufficient
for optimum sound performance.
Stand by LED
The Standby LED indicates the status of the BeoLab 7 – 1.
Access to Standby LED.
Stand by LED STATUS
Red BeoLab 7 – 1 is in standby.
Green BeoLab 7 – 1 is operating.
Orange BeoLab 7 – 1 is shut down due to thermal overload.
No light Fuse may be defect, check fuse F501 on PCB5
Pay special attention to the gaskets for baffle
If the LED Status is Orange, turn off and disconnect the mains to the BeoLab 7 – 1.
Wait for minimum 5 minutes for the loudspeaker to cool down.
Connect mains and turn on the BeoLab 7 – 1.
If the LED status still is orange the fault may be due to:
1. Woofer protection - Perform speaker unit check.
2. Tweeter protection - Perform speaker unit check.
3. Midrange protection - Perform speaker unit check.
4. NTC- board or connection on one of the woofers.
Access the NTC-board by dismantling the woofer.
5. Power supply failure.
No power on outlet
Check Fuse on PCB1
Pay special attention to the gaskets for baffle
Speaker unit check
Measure the impedance of the speaker unit to determine if the fault is caused by a
speaker unit.
It is recommended to measure on the terminals on the speaker unit.
The speaker unit must be dismantled from the BeoLab 7 – 1.
Pay special attention to the gasket on the speaker unit.
Speaker unit Nominal value Limits
Woofer 6.1 ohm 5.6 - 6.7 ohm
Midrange 6.1 ohm 5.6 - 6.7 ohm
Tweeter 6.1 ohm 5.6 - 6.7 ohm
If the speaker unit is outside the limits, it is defect and must be replaced.
Under normal conditions it is not necessary to replace the gaskets on the speaker
unit.
Power Link
Mk 3

4Replacement of spare parts
Replacement of spare parts.
Available spare parts
Main chassis, Module 999
PCB2, ICE-Power module
PCB4, Filter module
Woofer
Midrange
Tweeter
Fuse, PCB1 F1
Follow the illustrations on pages 7 - 13.
Speaker unit, woofer
1. Remove the defect speaker unit.
2. Adjust the Filter module or take a note of the speaker value from the label.
WO; Woofer.
3. Mount the speaker unit.
The NTC board must be connected, otherwise the BeoLab 7 – 1 will shut down.
4. Adjust the Filter module, if this action has not been performed in step 2.
Speaker unit, midrange or tweeter
1. Remove the defect speaker unit.
2. Adjust the Filter module or take a note of the speaker value from the label.
TW; Tweeter.
MR; Midrange.
3. Mount the speaker unit.
4. Adjust the Filter module, if this action has not been performed in step 2.
PCB4, Filter module
1. Remove the PCB4.
2. Transfer the speaker values to the Filter module potentiometers, or take a note of
the speaker value position on the defect PCB4.
WO; Woofer.
TW; Tweeter.
MR; Midrange.
3. Mount the new PCB4.
The NTC board must be connected, otherwise the BeoLab 7 – 1 will shut down.
4. Adjust the Filter module potentiometers, if this action has not been performed in
step 2.
Main chassis, module 999
1. No adjustment is required.

5
Adjustments
Adjustments described
Filter module adjustment on PCB4.
The speaker units are individually measured and the Filter module must be
adjusted accordingly.
Adjustment must be performed when either speaker unit or Filter module is
replaced.
The gasket on the adjustment lid on the baffle must be replaced whenever
adjustment is performed.
Access to adjustment points.
Adjustments
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
Speaker adjustment table
Speaker value
from label on speaker Switch position
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
TX10
TW: Tweeter
MR: Midrange
WO: Woofer

6
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 2.5kV(ac) is
obtained. Maintain the voltage level for one second, then slowly decrease the
voltage to 0V(ac).
Restore setup.
Ensure that,
- The F/W switch is in correct position.
- The plug is inserted over the Standby LED.
- The Power Link cable is a MK 3 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 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

7
Remove front cover
Pull out front cover
Push front cover to left

8Replace left baffle
10x
TX20
2x
TX10
6x
TX10
10x
TX10
8.1 Remove front cover
Remove screws
Remove screws
Pull out baffle
Remove screws, and pull out speakerunits
Remove plugs from ICE-Power module
Remove plugs from filter module
Remove screws, and remove modules
2P07
2P04
4P16
4P14
4P13
4P15
4P10
4P12