Bang Olufsen BeoSound 4 Service 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 !

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

Survey of modules

5 5

Keyboard

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

1.2 How to service

How to service

Converting mains supply voltage

Front line service

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).

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.

PIN-code

PIN-code active prior to service

Service code

PIN-code 1.3

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.

If the PIN-code is not deactivated prior to service you must use the Service code to unlock the product.

The service code

unlocks the product, but does not affect the pin-code setting

- gives you 12 hours service time

Entering the Service code

When the product asks for PIN-CODE press and hold

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.

l for 3 seconds.

1.4 PIN-code

Activate the PIN-code

Enter the PIN-code

If the PIN-code has been forgotten

Select the SETUP menu. Press

l twice and then STOP to bring up the PINCODE SETUP menu.

Enter the 4 digit Pin-code. Re-enter the code to conﬁrm it and press GO. If you want to change or delete the PIN-code, enter the correct PIN-code and press GO. It is now possible to change the PIN-code or delete the PIN-code.

If the PIN-code is activated and the product is disconnected from the mains for more than15-30 minutes, a PINCODE menu appears as soon as the product is switched on. Enter the PIN-code, and the product starts again.

If the PIN-code has been forgotten the only way to unlock the product again is by entering a 5 digit Master-code. The Master-code is ordered by sending a request via the Retail System. When the product prompts for a PIN-code, press and hold

l down to bring up the

MASTERCODE menu. Enter the Master-code and press GO. This will deactivate the PIN-code and reactivate the product.

Product locked by PIN-code

The product is locked by PIN-code when:

The PIN-code is activated and the mains is disconnected for more than 15- 30

minutes.

The product is unlocked when the PIN-code is entered.

The PIN-code counter is set to 5 attempts within 3 hours. When a wrong PIN-code has been entered 5 times within 3 hours, the product cannot receive any commands for a period of 3 hours. After this period the PIN-code counter is reset. The product must be in standby mode to activate the timer.

Warnings

STATIC ELECTRICITY MAY DESTROY THE PRODUCT

ESD

Laser exposure

Warnings 1.5

When electrical replacements or disassembly all taking place, use an ESD-mat. The internal electronics are very sensitive to static electricity. When mains voltage on BeoSound 4 is required, remove the connection from BeoSound 4 to the ESD mat.

BeoSound 4 contains a laser system and is classiﬁed as a class 1 laser product. BeoSound 4 must be opened by qualiﬁed personal only.

CLASS 1

LASER PRODUCT

General warnings

Cleaning

Wear cotton gloves to avoid ﬁngerprints on the product. The display surface on the product is very sensitive, so handling should be done with great care to avoid damage. When transporting BeoSound 4, it is recommended to use the product cover, part no. 3375490. Be sure that the plugs in each end are connected correctly.

Clean BeoSound 4 surfaces using DuPont Polishing Cloth, part no. 3624018. Finally clean the front glass with DuPont Final Tack Cloth. It prevents electrostatic buildup. Never use alcohol or other solvents to clean any parts of BeoSound 4.

1.6 Final check after repair

Final check after repair

Isolation test

Isolation test at the customer

Each set 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. Flashovers must not occur during the testing procedure! 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 of the insulation tester to the chassis pin of the aerial socket.

NOTE! To avoid damaging the set, it is essential that both terminals of the insulation tester have good contact. Slowly turn the voltage control of the insulation tester until a voltage of 2.5 kV and max. 5 mA is obtained. Maintain that voltage for one second, and then slowly turn it down again.

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.

Test of the device

After the insulation test, it is important to do the ﬁnal test of the device, to make sure there are no other faults.

Turn on BeoSound 4 and load a CD. Play the CD.

2. Switch to SD play mode.

3. Switch to FM radio and make a tuning.

4. Switch to DAB radio and make a tuning.

5. Use volume up/down.

6. Make sure that both the remote control and the buttons work perfectly.

Before ﬁnishing the device, make sure that the option setting is correct.

Fault ﬂow chart

Instructions

Fault ﬂow chart 2.1

Instructions before trouble shooting in the fault ﬂow chart:

•

In the following fault ﬂow chart BeoSound 4 is named BS4.

• Never connect or disconnect a socket, when the power is turned on.

Disconnect the mains supply and wait minimum 30 seconds for the electrolytic

capacitors to discharge.

When measuring voltages BS4 must be in CD mode,

•

When fault ﬁnding in CD use Bang & Olufsens test CD 3634031 (SBC444A).

2.2 Fault ﬂow chart

Placement of measuring points

6V - IC1000 pin1 5V_CD - IC1000 pin5

9V_CD

Mains supply - P101

5V_SB

2V - IC1 pin8

-12V - IC1 pin4

@uPH8

5V_CD

9V_CD

Mains supply P

101

Fault ﬂow chart 2.3

@back of display

5V_SB

@Headphone jack

12V

+12V

2.4 Fault ﬂow chart

Fault symptom:

- Fault in voltages

Possible causes:

- PCB61, SMPS

- Connections

Measure mains supply

101 OK?

Fuse F

e 12V, -12V,

Measur

6V 5V_SB

OK?

Measure connection

to Socket, PCB

Measure all

connections in BS4

are all right

OK?

Yes

Re-establish

connection

Fault symptom:

ont glass does not close

- Fr

Possible causes:

- Bright light shining on the product

- PCB3, Magic

Use menu to change

sensitivity of the door

censors

OK?

Change

PCB6

1, SMPS

Lift the front glass a

little

Push “Load”

Front glass opens

BS4 is placed in bright

light?

Move BS4 to another

place

OK?

Measure connections

or replace PCB3,

Magic

Fault symptom:

- No stand-by light

- Unable to use/r

Possible causes:

- PCB61, SMPS

- Fuse F

101

emote BS4

Measure mains supply

Fuse F

101 OK?

Connections from

1 to other

PCB6

boards OK?

Fault ﬂow chart 2.5

Yes

Replace defect fuse

Re-create connection

Fault symptom:

- No sound in headphone

Possible causes:

- PCB9, headphone connector

- PCB2, Master

Replace PCB6

Unplug headphone

Sound in speaker?

Sound in headphone?

1, SMPS

Plug another

headphone

Switch to FM

Sound in speaker?

Connection from

PCB2 to PCB9 OK?

Change PCB9,

Headphone

Change PCB2, Master

Re-establish

connection

Change PCB2, Master

2.6 Fault ﬂow chart

Yes

Fault symptom:

- Unable to remote with turn wheel

Possible causes:

- Connection not OK

- Defect turn wheel

- PCB3, Magic open defect

Fault symptom:

- Unable to use MasterLink

Possible causes:

rong option setting

- W

- ML cable

- PCB2, Master

Both wheels defect

Connection to PCB5,

PCB3, PCB6 and

keyboard OK?

Keyboard OK?

Check option setting

Refer to user guide

OK?

Connection to PCB5,

PCB3 and keyboard

OK?

Re-establish connection

Change PCB3, Magic

Check ML cable

e.g. try another cable

Connect to another

product

OK?

Change defect PCB5,

Turn wheel

Change PCB2, Master

Fault symptom:

- No power

- Stand-by led not lit

- Unable to r

Possible causes:

- PCB61, SMPS

emote

Measure connection

Measure mains supply

Change PCB61, SMPS

to PCB6

Fuse F

1, SMPS

101 OK?

Change cable

Re-establish

connection

Change fuse

Fault ﬂow chart 2.7

Fault symptom:

- Unable to play CD (test CD)

- No disc r

- Playback with SD car

- Cable connection to CD PCB OK

Possible causes:

- Focus pr

- PCB76, CD board

- PCB96, CD unit

Fault symptom:

- Regular dr playing CD

- CD stops playing/r

- CD search problem

Possible causes:

- Tracking problem

- Dirty lens

- PCB76, CD board

- PCB96, CD unit

otation

d OK

oblem

opouts/mute when

otating

Establish fault

symptom with B&O

Test CD

Fault symptoms

established?

Clean lens with

isopropyl alcohol and

play disk

OK?

Establish fault

symptom with B&O

Test CD

Fault symptoms

established?

Clean lens with

isopropyl alcohol and

play disk

OK?

Establish the fault with

customer’s CD

Check the disk for

visible defects

Report fault and send

the customer CD to

B&O for analyse

Measure supply

voltages to CD

mechanism

CB2, IC100 pin5 - 5V

PCB2, IC1003, pin4 - 9V

Measure connections

are correctly connected

Change PCB96, CD

unit

Establish the fault with

customers CD

Check the disk for

visible defects

Report fault and send

the customer CD to

B&O for analyse

Measure supply

voltages to CD

mechanism

CB2, IC100 pin5 - 5V

PCB2, IC1003, pin4 - 9V

Measure connections

are correctly connected

Measure supply voltages

to CD mechanism

CB2, IC1000, pin1 - 6V

PCB2, IC1003, pin2 - 12V

Change PCB2, Master

Measure supply voltages

to CD mechanism

CB2, IC1000, pin1 - 6V

PCB2, IC1003, pin2 - 12V

Yes

Change PCB61, SMPS

Change PCB96, CD

unit

Change PCB2, Master

2.8 Fault ﬂow chart

Yes

Fault symptom:

- Fault in display

- Only a few lines are faulty

Possible causes:

- PCB

10, display

- Connections to display

Fault symptom:

- Fault in display

- Nothing in display

- Stand-by led OK

- Able to r

- Able to play CD

Possible causes:

- PCB10, display

- Connections to display

emote

Measure connections

to the display is OK?

Change PCB

Change PCB10,

Display OK?

10,

Display

OK?

Re-establish

connection

Change PCB2, Master

Fault symptom:

- Unable to play FM

- CD plays OK

Possible causes:

- PCB85, tuner

- PCB6

1, SMPS

Measure voltages

12V

Measure connections

to tuner OK

Replace PCB85, tuner

Replace PCB61, SMPS

Fault symptom:

- Unable to play DAB

- CD plays OK

- FM plays OK

Possible causes:

- PCB37, DAB

- PCB61, SMPS

Measure voltages +6V

DAB aerial is mounted

Replace PCB6

Fault ﬂow chart 2.9

Yes

1, SMPS

Fault symptom:

- Unable to open fr

Possible causes:

- PCB3, Magic door censor

- PCB61, SMPS

- Motor

ont glass

Measure connections

to DAB OK

Replace PCB3

Lift the glass so the

keyboard is visible

Press the “Load”

The front glass slides

BS4 in service position

Measure connection to

Conﬁrm voltage

7, DAB

button

up?

PCB3, Magic

5V_SB & 6V

Measure connection

to PCB3, Magic

Change PCB6

1, SMPS Change PCB3, Magic

Measure voltages

5V_SB & 6V

Change PCB6

Change PCB2, Master

1, SMPS

Change PCB3, Magic

OK?

Change PCB2, Master

2.10 Fault ﬂow chart

Fault symptom:

- The front glass slides to the top without stopping above the keyboar

Possible causes:

- PCB8, T

Fault symptom:

- Unable to load CD

- Fr

- Front glass slides down a little and nothing else happens

Possible causes:

- PCB12, Switch

- PCB2, Master

acho

ont glass does not open

Connection to PCB8,

Tacho

OK?

Change PCB8, Tacho

OK?

Check if the magnet

on the door

mechanism is

mounted

e page 2.11

See ﬁgur

Measure connection

to PCB8, Tacho &

PCB

12, Switch

Re-establish

connection

Replace PCB2, Master

Yes

Replace motor unit

Fault symptom:

- No sound in loudspeaker and/or headphone

- Radio/DAB OK

- CD OK

Possible causes:

- PCB2, Master

- PCB

1, Socket

Door mechanism must

be in lower position

Measur

e 3.3V PCB12

P1 pin2

Change

PCB12, Switch

Measure voltages

OK?

Change PCB2, Master Change PCB

Change PCB2, Master

Change PCB6

1, SMPS

1, Socket

Placement of magnet

Fault ﬂow chart 2.11

2.12

Service Mode 3.1

Not completed

+ 49 hidden pages