Bang & Olufsen BeoSound 4 2851 User manual

BeoSound 4
Type 2851, 2852, 2853, 2854, 2855, 2857, 2858, 2859, 2860
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 !
ABO-CENTER v/HENRIKSENS ELEKTRONIK

CONTENTS
Survey of modules ........................................................................................ 1.1
How to service .............................................................................................. 1.2
PIN-code ....................................................................................................... 1.3
Warnings ...................................................................................................... 1.5
Final check after repair .................................................................................. 1.6
Fault flow chart ............................................................................................. 2.1
Placement of measuring points ..................................................................... 2.2
Placement of magnet .................................................................................. 2.11
Service mode ................................................................................................ 3.1
Service tips .................................................................................................... 4.1
Repair tips ..................................................................................................... 4.2
Replacement of modules ............................................................................... 5.1
Specification guidelines for service use .......................................................... 6.1
Wiring diagram ............................................................................................. 7.1
Available parts .............................................................................................. 8.1
ABO-CENTER v/HENRIKSENS ELEKTRONIK

Survey of modules 1.1
PCB1 .......................... Socket
PCB2 .......................... Master
PCB3 .......................... Magic
PCB4 .......................... Light
PCB5 .......................... Turn wheel
PCB6 .......................... Main microprocessor
PCB7 .......................... Codec
PCB8 .......................... Tacho
PCB9 .......................... Headphone
PCB10 ........................ Display
PCB11 ........................ SD/MMC card reader
PCB12 ........................ Switch
37Module ................... DAB
PCB61 ........................ SMPS
PCB85 ........................ FM tuner EU/JP
96Module ................... CD unit
Survey of modules
37
2
10
12
8 96
61 85
5 5
9
3
4
4
7 11
1
Keyboard
6
ABO-CENTER v/HENRIKSENS ELEKTRONIK

1.2 How to service
How to service
Converting mains supply voltage
The unit has separate type nos. for each market, due to country approvals.
The mains voltage is determined by the type nos. of the unit, there are only two
internal mains voltage settings (a jumper) on the SMPS, 100/120V and
230/240V AC (P108, when mounted = 100/120V).
Front line service
The BeoSound 4 unit has been developed for simple module exchange to follow
the on-site service strategy. Module exchange is possible onsite, in the shop or in
the service workshop whatever is most convenient in each case. For on-site service
a back-up suitcase must be used. Module exchange is the recommended way to
perform service, due to the fact that most of the modules are multi-layer based,
and most of the circuits are on a single main PCB. An electrical fault symptom can
be removed during one visit to the customer’s home, if you bring a BeoSound 4
back-up suitcase with you. Is it a mechanical symptom, the particular part must be
brought with you separately.
Service documentation
Service documentation for BeoSound 4 will be a Service manual with part no. for
the back-up suitcase, electrical and mechanical parts, user’s guides etc.
ABO-CENTER v/HENRIKSENS ELEKTRONIK

PIN-code 1.3
PIN-code
The product has a 4 digit PIN-code, of the user´s own choice, which must be entered
if the product has been disconnected from the mains for 15-30 min.
If the PIN-code is activated, and the product has been without mains for 15-30 min.,
the user will be asked to enter the 4 digit PIN-code when the product is switched on.
Before the product is handed in to service it is a good idea to ask the customer to
deactivate the PIN-code.
The PIN-code is activated when the product is shipped from Bang & Olufsen.
Refer to the user guide for further information.
PIN-code active prior to service
If the PIN-code is not deactivated prior to service you must use the Service code to
unlock the product.
Service code
The service code
-unlocks the product, but does not affect the pin-code setting
- gives you 12 hours service time
Entering the Service code
1. When the product asks for PIN-CODE press and hold lfor 3 seconds.
2. The Master code menu appears.
3. Enter the Service code: 1 1 1 1 1.
Important notice concerning Service time
The service time is active as long as the product is connected to the mains, including
Standby.
To obtain maximum service time:
Only connect the product to the mains while you are performing actual service on
the product.
When the service time is expired, the product can only be unlocked by entering
the PIN-code or the Master code.
Registration of the modules
The modules will be registered to the product in the following situations:
-the product has been connected to the mains for more than 12 hours, including
Standby time.
-the PIN-code is activated or deactivated.
PIN-code deactivated by customer prior to service
With the PIN-code deactivated prior to service you must be aware of the modules
will be registered to the product in the following situations:
-the product has been connected to the mains for more than 12 hours, including
Standby time.
-the PIN-code is activated or deactivated.
The registration of modules in the product can only be changed at Bang & Olufsen.
ABO-CENTER v/HENRIKSENS ELEKTRONIK