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Bang & Olufsen BeoSound 4 2851 Service Manual

Summary of BeoSound 4 2851

  • Page 1

    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/henriksen...

  • Page 2

    Contents survey of modules ........................................................................................ 1.1 how to service .............................................................................................. 1.2 pin-code ............................................................

  • Page 3

    Survey of modules 1.1 pcb1 .......................... Socket pcb2 .......................... Master pcb3 .......................... Magic pcb4 .......................... Light pcb5 .......................... Turn wheel pcb6 .......................... Main microprocessor pcb7 ...........................

  • Page 4

    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 ...

  • Page 5

    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 digi...

  • Page 6

    1.4 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 possi...

  • Page 7

    Warnings 1.5 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. Laser exposure beosound 4 con...

  • Page 8

    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-cir...

  • Page 9

    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 fo...

  • Page 10

    2.2 fault flow chart placement of measuring points 6v - ic000 pin 5v_cd - ic000 pin5 mains supply - p0 5v_sb 2v - ic pin8 -2v - ic pin4 9v_cd abo-center v/henriksens elektronik.

  • Page 11

    Fault flow chart 2.3 @uph8 6v 5v_cd 9v_cd mains supply p0 @back of display 5v_sb @headphone jack -2v +2v abo-center v/henriksens elektronik.

  • Page 12

    2.4 fault flow chart fault symptom: - fault in voltages possible causes: - pcb6, smps - connections measure mains supply fuse f0 ok? Measure connection to socket, pcb ok? Re-establish connection measure 2v, -2v, 6v 5v_sb ok? Measure all connections in bs4 are all right change pcb6, smps fault sympto...

  • Page 13

    Fault flow chart 2.5 fault symptom: - no stand-by light - unable to use/remote bs4 possible causes: - pcb6, smps - fuse f0 measure mains supply fuse f0 ok? Replace defect fuse connections from pcb6 to other boards ok? Re-create connection replace pcb6, smps fault symptom: - no sound in headphone pos...

  • Page 14

    2.6 fault flow chart fault symptom: - unable to remote with turn wheel possible causes: - connection not ok - defect turn wheel - pcb3, magic open defect both wheels defect connection to pcb5, pcb3 and keyboard ok? Change defect pcb5, turn wheel connection to pcb5, pcb3, pcb6 and keyboard ok? Re-est...

  • Page 15

    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 - pcb6, cd board - pcb96, cd unit establish fault symptom with b&o test cd fault symptoms established? Establish the fault w...

  • Page 16

    2.8 fault flow chart fault symptom: - fault in display - only a few lines are faulty possible causes: - pcb0, display - connections to display measure connections to the display is ok? Re-establish connection change pcb0, display ok? Change pcb2, master fault symptom: - fault in display - nothing in...

  • Page 17

    Fault flow chart 2.9 fault symptom: - unable to play dab - cd plays ok - fm plays ok possible causes: - pcb3, dab - pcb6, smps measure voltages +6v replace pcb6, smps dab aerial is mounted measure connections to dab ok replace pcb3, dab fault symptom: - unable to open front glass possible causes: - ...

  • Page 18

    2.0 fault flow chart fault symptom: - the front glass slides to the top without stopping above the keyboard possible causes: - pcb8, tacho connection to pcb8, tacho ok? Re-establish connection change pcb8, tacho ok? Replace pcb2, master replace motor unit fault symptom: - unable to load cd - front g...

  • Page 19

    Fault flow chart 2. Placement of magnet abo-center v/henriksens elektronik.

  • Page 20

    2.2 abo-center v/henriksens elektronik.

  • Page 21

    Service mode 3. Not completed abo-center v/henriksens elektronik.

  • Page 22

    3. Service mode not completed abo-center v/henriksens elektronik.

  • Page 23

    Service tips 4. Service tips service tool along with a cable kit for servicetool (3375397) and a p.I.T. Box (3375055) it is possible to flash-update the fep software. From the service module a special service cable goes to the beosound 4 unit. From the service module another service cable goes to a ...

  • Page 24

    4. Repair tips repair tips cd the diodes and the laser are very sensitive to static electricity. Damaging the diodes or laser may reduce their lives dramatically. So be sure, that the workstation is protected against static electricity. The product may not be connected to the mains, when the cd mech...

  • Page 25

    5. Replacement of modules replacement of the pcb61 (smps) when replacing pcb6 (smps), remember to check jumper at 6p08 mains voltage 5v = jumper at 6p08 must be mounted mains voltage 220v = jumper at 6p08 must be removed main replacement of the main microcomputer pcb6 (µph8) when replacing the pcb6 ...

  • Page 26

    5.2 disassembly overview pcb module name page socket 5.5 2 master 5.6 3 magic 5.8 4 light 5.9 5 turn wheel 5.0 6 main microprocessor 5.7 7 codec 5. 8 tacho 5.2 9 headphone 5.3 0 display 5.4 sd/mmc card reader 5.5 2 switch 5.6 37module dab 5.20 6 smps 5.7 85 fm tuner 5.8 96module cd unit 5.9 cabinet ...

  • Page 27

    5.3 - push front glass to top position and remove it - remove all cables 4x tx10 - remove screw covers at top - and all screws - remove cables beosound 4 in service position 8p1 8p3 5p2 plug with lock! 8p and 5p2 abo-center v/henriksens elektronik.

  • Page 28

    5.4 - remove screws at front 3x tx10 - remove screws at socket panel remove chassis + 5.3 beosound 4 in service position 4x tx10 - remove cables - pull out chassis 2p1002 2p1009 abo-center v/henriksens elektronik.

  • Page 29

    5.5 replace pcb, socket - pull off socket cover - remove plugs - remove screws + 5.3 beosound 4 in service position - remove plugs + 5.4 remove chassis 4x tx20 1p7 1p1 gnd! 85p100 7p101 snap-locks! Abo-center v/henriksens elektronik.

  • Page 30

    5.6 replace pcb2, master 2x tx10 - remove electrical chassis from mechanical chassis - remove cables pcb2 2p1004 2p1008 + 5.3 beosound 4 in service position - remove screws and release snaplocks + 5.4 remove chassis ➁ ➀ 76p103 2p1003 - remove plugs abo-center v/henriksens elektronik.

  • Page 31

    5.7 - remove screws 6x tx10 - remove plugs on the back of pcb2 replace pcb2, master 2p1005 2p1013 2p1010 2p1012 2p1011 - transfer eeprom software ic3 ic6 eeprom pcb6 use ic-pliers for replacement (part no. 362945) ic socket eeprom abo-center v/henriksens elektronik.

  • Page 32

    5.8 + 5.3 beosound 4 in service position - remove screws - remove pcb3, magic + 5.4 remove chassis replace pcb3, magic 2x tx7 ➁ ➀ ➀ - remove pcb9, headphone ➀ ➀ ➁ abo-center v/henriksens elektronik.

  • Page 33

    5.9 replace pcb4, light + 5.3 beosound 4 in service position - remove pcb4, light + 5.27 remove finger niche abo-center v/henriksens elektronik.

  • Page 34

    5.0 - remove cable - release snaplocks and push out replace pcb5, turn wheel and parts (left and right) + 5.3 beosound 4 in service position - dismantle turn wheel 5p1 2x tx10 pcb5 base wheel snaplock! ➀ ➁ ➀ abo-center v/henriksens elektronik.

  • Page 35

    5. Replace pcb7, codec 7p100 7p101 - remove plugs - remove screw x tx10 2x tx10 - remove electrical chassis from mechanical chassis + 5.3 beosound 4 in service position - remove screws and release snaplock + 5.4 remove chassis ➁ ➀ abo-center v/henriksens elektronik.

  • Page 36

    5.2 replace pcb8, tacho + 5.3 beosound 4 in service position + 5.4 remove chassis - remove screws and plug + 5.23 remove clamper unit 3x tx10 - remove screws - remove drive belt - remove plug and gear wheel 8p3 p1 4x tx10 abo-center v/henriksens elektronik.

  • Page 37

    5.3 replace pcb9, headphone + 5.3 beosound 4 in service position - remove pcb9, headphone + 5.4 remove chassis ➀ ➀ + 5.8 remove pcb3, magic ➁ abo-center v/henriksens elektronik.

  • Page 38

    5.4 replace pcb0, display 3x tx10 - remove screws - remove cable + 5.3 beosound 4 in service position con1 plug with lock! Con abo-center v/henriksens elektronik.

  • Page 39

    5.5 replace pcb, sd/mmc card reader + 5.3 beosound 4 in service position - remove screws - pull out pcb, sd/mmc card reader 2x tx6 abo-center v/henriksens elektronik.

  • Page 40

    5.6 replace pcb2, switch + 5.3 beosound 4 in service position - remove screw + 5.4 remove chassis abo-center v/henriksens elektronik.

  • Page 41

    5.7 replace pcb6, smps 7p100 7p101 - remove plugs - remove screws 4x tx10 2x tx10 - remove electrical chassis from mechanical chassis + 5.3 beosound 4 in service position - remove screws and release snaplock + 5.4 remove chassis ➁ ➀ abo-center v/henriksens elektronik.

  • Page 42

    5.8 replace pcb85, fm tuner - remove screws - remove plugs on th back of pcb85 + 5.3 beosound 4 in service position 3x tx10 + 5.4 remove chassis 85p106 85p103 85p100 abo-center v/henriksens elektronik.

  • Page 43

    5.9 replace 96module, cd unit 2x tx10 - remove electrical chassis from mechanical chassis + 5.3 beosound 4 in service position - remove screws and release snaplock + 5.4 remove chassis ➁ ➀ 4x tx10 - remove screws - pull off cd unit abo-center v/henriksens elektronik.

  • Page 44

    5.20 - remove plugs - remove screws + 5.3 beosound 4 in service position 3x tx10 replace 37module, dab + 5.4 remove chassis 37p201 37p101 abo-center v/henriksens elektronik.

  • Page 45

    5.2 replace cabinet + 5.3 beosound 4 in service position + 5.4 remove chassis + 5.8 remove pcb3, magic + 5.24 remove base abo-center v/henriksens elektronik.

  • Page 46

    5.22 replace clamper cover + 5.3 beosound 4 in service position + 5.4 remove chassis - release snaplocks + 5.23 remove clamper unit abo-center v/henriksens elektronik.

  • Page 47

    5.23 replace clamper unit + 5.3 beosound 4 in service position + 5.4 remove chassis 4x tx10 - remove screws - lift off clamper note! Take care that the arm is placed correctly ! + 5.9 remove cd unit abo-center v/henriksens elektronik.

  • Page 48

    5.24 4x tx10 replace base + 5.3 beosound 4 in service position - remove screws + 5.4 remove chassis abo-center v/henriksens elektronik.

  • Page 49

    5.25 replace door mechanism + 5.3 beosound 4 in service position + 5.4 remove chassis + 5.23 remove clamper unit + 5.2 remove motor unit - check that the alignment is correct scratch in the plastic abo-center v/henriksens elektronik.

  • Page 50

    5.26 replace drivebelt + 5.3 beosound 4 in service position + 5.4 remove chassis - remove screws and plug + 5.23 remove clamper unit 3x tx10 - remove screws - remove drivebelt p1 4x tx10 abo-center v/henriksens elektronik.

  • Page 51

    5.27 - remove finger niche note: lift free of “lock” 4x tx6 replace finger niche + 5.3 beosound 4 in service position - remove screws ➀ ➁ abo-center v/henriksens elektronik.

  • Page 52

    5.28 - remove screws - pull out keyboard 4x tx6 replace keyboard + 5.3 beosound 4 in service position - remove cables + 5.5 remove sd/mmc card reader + 5.27 remove finger niche 5p1 5p1 abo-center v/henriksens elektronik.

  • Page 53

    5.29 replace motor + 5.3 beosound 4 in service position + 5.4 remove chassis - remove screws and plug + 5.23 remove clamper unit 3x tx10 - remove screws - remove drivebelt - remove screws and plug 3x 8p3 p1 4x tx10 abo-center v/henriksens elektronik.

  • Page 54

    5.30 abo-center v/henriksens elektronik.

  • Page 55

    Specification guidelines for service use 6. Specification guidelines for service use beosound 4 with fm and rds type 285 eu 230v type 2852 gb 230v type 2853 us 20v type 2854 jp 00v type 2855 aus 240v type 2857 twn 20v type 2858 kor 230v type 2859 lat 230v type 2860 chk 230v preamplifier section inte...

  • Page 56

    6.2 specification guidelines for service use dynamic range (khz) ≥ 92db channel unbalance (khz) ≤ ±db thd+noise: khz, 0 dbfs, volume 76 -85db / -75db with volume 76 sd player/recorder storage media secure digital cards (sd) multimediacard (mmc) or 00% sd sandisk compatible capacity all capacity audi...

  • Page 57

    Specification guidelines for service use 6.3 audio aux input/output x aux in l/r phono 2v rms 22 – 47k w aux out l/r phono .3v rms ±0.2 w power link front & rear pin pl on = >2.5v, off = pin 2 signal gnd pin 3 audio l out 0v to 2v rms pin 4 pl speaker on = >2.5v, off = pin 5 audio r out 0v to 2v rms...

  • Page 58

    6.4 abo-center v/henriksens elektronik.

  • Page 59

    7.1 wiring diagram wiring diagram 7.1 7.1 wiring diagram > > 6200357 w13 6200357 w14 w27 6277880 p101 > > > > > > 6270881 w24 p1 > > > > > > > > p2 > > > > > > > > > > > > > p1006 > > > > > > > > > > p1 > > > > > > > > > > > > > > p1007 > > > > > > > > > > > > > > p1001 > > > > > w08 6200094 > > > p...

  • Page 60

    8.1 available parts available parts 8.1 8.1 available parts beosound 4 9003 9002 9001 incl. Pcb12 see page 8.4 see page 8.3 see page 8.5 9005 9004 9006 9007 9008 w9 9010 9011 12 9 3 incl. Pos. Nos. 9011, w9, pcb9 1 1 1 1 1 2 1 1 1 3 3 3 3 1 1 1 1 1 1 4 4 4 6 6 5 5 5 5 5 incl. Pos. No. 5 incl. Pos. N...

  • Page 61

    Available parts 8.2 beosound 4 9001 3110018 movable mechanics incl. Pcb12 9002 3162231 front 9003 3162228 glass 9004 3341017 screw cover, left 9005 3341014 screw cover, right 9006 3430045 cabinet 9007 3103136 base incl. Pos. No. 5 9008 3151913 wire guide incl. Pos. No. 5 9009 6100079 mains cable eu/...

  • Page 62

    8.3 available parts front 9012 3162232 finger niche incl. 2 x pcb4 9013 3162233 front cover incl. Pos. No. 9016 9014 2791022 set of wheels incl pcb5 9015 3167040 keyboard 9016 3162217 cover 4module 8002409 pcb4, light 5module 8002410 pcb5, turn wheel 11module 8002405 sd/mmc card reader 9012 4 4 7 7 ...

  • Page 63

    Available parts 8.4 cd unit and motor 9017 3320949 cd unit 9018 3162230 clamper cover 9019 2755082 gear unit 9020 2732127 belt 9021 8400025 motor 8module 8002530 pcb8, tacho 96module 8420024 cd unit 9017 9018 96module 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 8 9020 9019 9021 screws 1 2052011 screw 3 x 10mm a...

  • Page 64

    8.5 available parts electrical chassis 9025 3110010 holder f/pcb2 and pcb37 9026 3110012 holder f/pcb61 9027 3110011 holder f/pcb7 and pcb85 9028 2570016 ground connector 9029 3110013 holder f/pcb1 9030 3160344 cover 1module 8002592 pcb1, socket 2module 8002593 pcb2, master incl. Pcb6 6module 800013...

  • Page 65

    Available parts 8.6 wire bundles see wiring diagram page 7.1. The part no. Is printed on the diagram above the wire bundle, as shown. Parts not shown 3395296 back-up suitcase 3375490 product cover 3634031 test cd - sbc 444a 3624018 du pont polishing cloth servicetool 3375055 p.I.T. Box servicetool –...

  • Page 66

    8.7 available parts packing 9301 3396308 foam, set of top and bottom 9302 3917143 foam foil 9303 3392385 outer carton 9301 9302 9301 9303 abo-center v/henriksens elektronik.

  • Page 67

    Floor stand 2180 1218011 available parts 8.8 9101 3932012 tube incl. Pos. Nos. 9102, 1 9102 2369003 cable clip 9103 3162237 cover plate 9104 3103391 rubber foot 1 2046017 screw 6 x 16mm 2 3390065 bag w/parts 3 2019035 screw 4 x 12mm 9301 3396329 foam packing, set 9302 3016011 guide f/cover plate 930...

  • Page 68

    8.9 available parts wall bracket 2181 1218111 3 2019035 screw 4 x 12mm 3390071 bag w/parts 3507400 guide 3 3 3 abo-center v/henriksens elektronik.

  • Page 69

    Abo-center v/henriksens elektronik.

  • Page 70

    Bang & olufsen dk-7600 struer denmark phone +45 96 84 11 22* fax +45 97 85 39 11 3538035 04-06 abo-center v/henriksens elektronik.