Bang & Olufsen BeoLab 12-3 User manual

BeoLab 12-3
Type 6232
Service Manual - version 1.0
English
German, French, Italian, Spanish, Dutch, Japanese, Korean and
Simplied Chinese 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
Troubleshooting – Fault ow chart ............................................ 2.1
Adjustments ............................................................................. 3.1
Replacement of modules ........................................................... 4.1
Before assembly process – Assembly process –
Final check after repair .............................................................. 5.1
Specication guidelines for service use ...................................... 6.1
Block diagram ........................................................................... 7.1
Wiring diagram ......................................................................... 7.2
Available parts .......................................................................... 8.1
Change log:
Ver. 1.0 ................................................................. Original release

Survey of modules
Modules:
PCB04 SMPS
PCB30 Digital Sound Engine (DSE)
PCB35 ICEpoweramplier(x3)
PCB40 Interconnection
PCB41 V.CON (not present in all versions)
PCB47 LED Indicator
PCB48 NTC(x3)
PCB68 Signal Switch
Speaker units:
Tweeter unit
Midrange unit
Woofer(cosconex2)
Survey of modules 1.1
35
35
35
30
04
68
48
48
40
47
48
41

1.2 How to service
How to service
Strategy
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 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.
Important!
After the modules have been replaced and the product is ready to be assembled,
there are some very important steps you must be aware of before starting the
assembling process of the product.
Please refer to page 5.1.
Recommended tools for service
- Static-protectiveeldservice
- White gloves
- Shoe covers
- Soft lint-free cloth for cleaning
Final check after repair
Thenal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 5.7.

How to service 1.3
Warnings when handling
Static electricity
Static electricity may damage the product.
Static-protectiveeldservicekit
Astatic-protectiveeld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.
ESD
ESD-Mat
STATIC ELECTRICITY
MAY DESTROY THE
PRODUCT
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 × o o o o o
PCBA × o o o o o
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speciedinthe
standard SJ/T 11363-2006.

1.4

Troubleshooting – Fault ow chart 2.1
Troubleshooting
LED indicator .................................................................................... 2.2
Description of LED errors .................................................................. 2.2
Product Information - Usage data ..................................................... 2.3
Error log ........................................................................................... 2.3
Test - Sound ...................................................................................... 2.4
Speaker unit check ........................................................................... 2.5
NTC module test ............................................................................... 2.5
Fault ow chart
No function, No LED indication ......................................................... 2.6
No power ON, Red LED indication ..................................................... 2.8
LED indicator is orange (constant lit) ................................................ 2.10
LED indicator is ashing orange ...................................................... 2.12
No sound from any speaker, Green LED indication .......................... 2.14
Distorted audio from one or more speaker(s) .................................. 2.16

2.2 Troubleshooting
Troubleshooting
LED indicator
If errors occur during operation, the product will enter an error state. The LED in
the lens tweeter unit indicates the respective error state by changing colour (red/
orange/green), ashing or lit.
Description of LED errors
- Green
Constant lit:
Product is ON and no problems is observed.
Flashing:
Software update is on-going (or ready for software update).
- Orange
Constant lit:
The product is operating but something is on the limit. The product will revert to
normal operation by itself without the need of user interaction.
This could be:
- The product is close to overheating, and have shortly turned off one or more
ampliers shortly.
- Over current protection circuit switched off amplier shortly.
Flashing:
The product is having a fail. Product will not revert to normal operation.
In most cases it is required to contact a retailer. In some cases can be resolved by
disconnecting/connecting the mains.
This could be:
- NTC is defective or disconnected.
- Over current protection is constantly active.
- Over heating of ampliers.
- Serial/type numbers are missing.
- Calibration is not done (to be done by service personnel).
- Calibration failed.
- Red
Constant lit:
Product is turning off (or will turn off in a short time)
Note!
The blinking frequency is telling the severity of the problem. Blinking slowly is used
for smaller problems. Blinking fast is used for bigger issues.
LED

Troubleshooting 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.
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.
Approach (ServiceTool)
Connect a service PC with ServiceTool. Follow the procedure below:
- Remove the service lid next to the mains inlet.
- Connect the ServiceTool hardware from the service connector on the product to
the service PC as shown:
- 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 12-3 and click Launch.
- Click on the PRODUCT tab (if not already shown).
- Click +next to each item (BeoLab-> BeoLab 12-3 to expand the menus.
- Click Info -> Product (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.
I/O

2.4 Troubleshooting
Test - Sound
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 Test Sound 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.
For use simply choose a sound frequency and an output amplier to activate the
test function.
Woofer 1
Woofer 2
Midrange
Tweeter
I/O