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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 |
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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 1.
Survey of modules
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37 |
2 |
6 |
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10 |
8 |
4 |
96 |
85 |
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4 |
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12 |
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61 |
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11 |
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7 |
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5 |
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5 |
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Keyboard |
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3 |
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9 |
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1
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...........................PCB1 |
Socket |
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PCB2 ........................... |
Master |
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PCB3 ........................... |
Magic |
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PCB4 ........................... |
Light |
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PCB5 ........................... |
Turn wheel |
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PCB6 ........................... |
Main microprocessor |
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PCB7 ........................... |
Codec |
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PCB8 ........................... |
Tacho |
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PCB9 ........................... |
Headphone |
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PCB10 ......................... |
Display |
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PCB11 ......................... |
SD/MMC card reader |
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PCB12 ......................... |
Switch |
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37Module ................... |
DAB |
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PCB61 ......................... |
SMPS |
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PCB85 ......................... |
FM tuner EU/JP |
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96Module ................... |
CD unit |
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1.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.
PIN-code 1.
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 l for 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.
1.PIN-code
Activate the PIN-code
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.
Enter 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
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 1530 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 1.
Warnings
ESD
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.
STATIC ELECTRICITY
MAY DESTROY THE
PRODUCT
Laser exposure
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
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.
Cleaning
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. Final check after repair
Final check after repair
Isolation test
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.
Isolation test at the customer
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.
1.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 2.
Fault flow chart
Instructions
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. Fault flow chart
Placement of measuring points
6V - IC1000 pin1
5V_CD - IC1000 pin5
9V_CD
Mains supply - P101
5V_SB
12V - IC1 pin8 -12V - IC1 pin4
Fault flow chart 2.
@uPH8
6V 
5V_CD
9V_CD
Mains supply
P101
@back of display 5V_SB
@Headphone jack -12V
+12V
2.Fault flow chart
Fault symptom:
- Fault in voltages
Possible causes:
-PCB61, SMPS
-Connections
Fault symptom:
- Front glass does not close
Possible causes:
-Bright light shining on the product
-PCB3, Magic
No
Yes
Measure mains supply |
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Measure connection |
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Re-establish |
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Fuse F101 OK? |
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to Socket, PCB1 |
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connection |
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OK? |
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Measure 12V, -12V, |
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Measure all |
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6V 5V_SB |
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connections in BS4 |
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OK? |
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are all right |
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Change
PCB61, SMPS
Use menu to change sensitivity of the door censors
OK?
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 flow chart 2.
No
Yes
Fault symptom: |
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- No stand-by light |
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- Unable to use/remote BS4 |
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Possible causes: |
Measure mains supply |
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Replace defect fuse |
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- PCB61, SMPS |
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Fuse F101 OK? |
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- Fuse F101 |
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Connections from
PCB61 to other 
Re-create connection boards OK?
Replace PCB61, SMPS
Fault symptom: |
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- No sound in headphone |
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Possible causes: |
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Unplug headphone |
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Switch to FM |
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- PCB9, headphone connector |
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Change PCB2, Master |
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- PCB2, Master |
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Sound in speaker? |
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Sound in speaker? |
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Plug another |
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Connection from |
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headphone |
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PCB2 to PCB9 OK? |
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connection |
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Sound in headphone? |
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Change PCB9, |
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Change PCB2, Master |
Headphone |
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2.Fault flow chart
Fault symptom:
- Unable to remote with turn wheel
Possible causes:
-Connection not OK
-Defect turn wheel
-PCB3, Magic open defect
No
Yes
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Connection to PCB5, |
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Change defect PCB5, |
Both wheels defect |
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PCB3 and keyboard |
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Turn wheel |
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OK? |
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Connection to PCB5, |
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Re-establish |
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PCB3, PCB6 and |
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connection |
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keyboard OK? |
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Keyboard OK? |
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Change PCB3, Magic |
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Fault symptom: |
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Check option setting |
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Check ML cable |
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e.g. try another cable |
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- Unable to use MasterLink |
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Refer to user guide |
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Connect to another |
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Change PCB2, Master |
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product |
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Possible causes: |
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OK? |
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OK? |
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- Wrong option setting |
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- ML cable |
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- PCB2, Master |
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Change cable |
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Fault symptom: |
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Measure connection |
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- No power |
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to PCB61, SMPS |
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- Stand-by led not lit |
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- Unable to remote |
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Possible causes: |
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- PCB61, SMPS |
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Measure mains supply |
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Re-establish |
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connection |
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Fuse F101 OK? |
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Change fuse |
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Change PCB61, SMPS
Fault flow chart 2.
Fault symptom:
-Unable to play CD (test CD)
-No disc rotation
-Playback with SD card OK
-Cable connection to CD PCB OK
Possible causes:
-Focus problem
-PCB76, CD board
-PCB96, CD unit
Fault symptom:
-Regular dropouts/mute when playing CD
-CD stops playing/rotating
-CD search problem
Possible causes:
-Tracking problem
-Dirty lens
-PCB76, CD board
-PCB96, CD unit
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No |
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Yes |
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Establish the fault with |
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Establish fault |
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customer’s CD |
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symptom with B&O |
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Check the disk for |
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Test CD |
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visible defects |
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Fault symptoms |
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Report fault and send |
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established? |
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the customer CD to |
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B&O for analyse |
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Measure supply |
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Clean lens with |
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voltages to CD |
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Measure supply voltages |
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isopropyl alcohol and |
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mechanism |
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to CD mechanism |
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play disk |
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PCB2, IC100 pin5 - 5V |
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Change PCB61, SMPS |
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PCB2, IC1000, pin1 - 6V |
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PCB2, IC1003, pin4 - 9V |
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PCB2, IC1003, pin2 - 12V |
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OK? |
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Measure connections |
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are correctly connected |
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Change PCB96, CD |
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Change PCB2, Master |
unit |
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Establish fault |
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Establish the fault with |
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customers CD |
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symptom with B&O |
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Check the disk for |
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Test CD |
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visible defects |
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Fault symptoms |
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Report fault and send |
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established? |
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the customer CD to |
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B&O for analyse |
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Measure supply |
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Clean lens with |
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voltages to CD |
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Measure supply voltages |
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isopropyl alcohol and |
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mechanism |
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to CD mechanism |
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Change PCB61, SMPS |
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play disk |
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PCB2, IC100 pin5 - 5V |
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PCB2, IC1000, pin1 - 6V |
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PCB2, IC1003, pin4 - 9V |
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PCB2, IC1003, pin2 - 12V |
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OK? |
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Measure connections |
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are correctly connected |
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Change PCB96, CD |
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Change PCB2, Master |
unit |
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2.Fault flow chart
Fault symptom:
-Fault in display
-Only a few lines are faulty
Possible causes:
-PCB10, display
-Connections to display
Fault symptom:
-Fault in display
-Nothing in display
-Stand-by led OK
-Able to remote
-Able to play CD
Possible causes:
-PCB10, display
-Connections to display
Fault symptom:
-Unable to play FM
-CD plays OK
Possible causes:
-PCB85, tuner
-PCB61, SMPS
No
Yes
Measure connections |
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Re-establish |
to the display is OK? |
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connection |
Change PCB10,
Display 
Change PCB2, Master
OK?
Change PCB10, |
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Change PCB2, Master |
Display OK? |
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Measure voltages |
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Replace PCB61, SMPS |
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+12V |
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Measure connections to tuner OK
Replace PCB85, tuner
Fault flow chart 2.
Fault symptom:
-Unable to play DAB
-CD plays OK
-FM plays OK
Possible causes:
-PCB37, DAB
-PCB61, SMPS
Fault symptom:
- Unable to open front glass
Possible causes:
-PCB3, Magic door censor
-PCB61, SMPS
-Motor
Measure voltages +6V
Replace PCB61, SMPS
DAB aerial is mounted
Measure connections to DAB OK
Replace PCB37, DAB
Lift the glass so the |
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keyboard is visible |
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Measure connection |
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Press the “Load” |
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button |
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to PCB3, Magic |
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The front glass slides |
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up? |
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No
Yes
Measure voltages |
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Change PCB61, SMPS |
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5V_SB & 6V |
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BS4 in service position Measure connection to
PCB3, Magic 
Change PCB61, SMPS Change PCB3, Magic 
Change PCB2, Master Confirm voltage
5V_SB & 6V
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OK? |
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2.10Fault flow chart
Fault symptom: |
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Connection to PCB8, |
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Re-establish |
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- The front glass slides to the top |
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Tacho |
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connection |
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without stopping above the |
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keyboard |
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Possible causes: |
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- PCB8, Tacho |
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Change PCB8, Tacho |
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Replace PCB2, Master |
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Replace motor unit |
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OK? |
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Fault symptom:
-Unable to load CD
-Front glass does not open
-Front glass slides down a little and nothing else happens
Possible causes:
-PCB12, Switch
-PCB2, Master
Check if the magnet on the door
mechanism is mounted
See figure page 2.11
Measure connection to PCB8, Tacho & PCB12, Switch
Door mechanism must
be in lower position Change PCB2, Master Measure 3.3V PCB12
P1 pin2
Change PCB12, Switch
Fault symptom:
-No sound in loudspeaker and/or headphone
-Radio/DAB OK
-CD OK
Possible causes:
-PCB2, Master
-PCB1, Socket
Measure voltages |
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Change PCB61, SMPS |
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OK? |
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Change PCB2, Master
Change PCB1, Socket
No
Yes
Fault flow chart 2.11
Placement of magnet
2.12
Service Mode 3.
Not |
completed |
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