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Bang & Olufsen BeoSound 4 2851 Service Manual

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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 !

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Summary of Contents for Bang & Olufsen 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 !

  • Page 2: Table Of Contents

    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 ....................

  • Page 3: Survey Of Modules

    Survey of modules Survey of modules Keyboard 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 ......

  • Page 4: How To Service

    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).

  • Page 5: Pin-Code

    PIN-code 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.
  • Page 6 PIN-code Activate the PIN-code Select the SETUP menu. twice and then STOP to bring up the PINCODE SETUP menu. Press 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.

  • Page 7: Warnings

    Warnings Warnings 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...

  • Page 8: Final Check After Repair

    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.

  • Page 9: Fault Flow Chart

    Fault flow chart 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.

  • Page 10: Placement Of Measuring Points

    Fault flow chart Placement of measuring points 6V - IC000 pin 5V_CD - IC000 pin5 9V_CD Mains supply - P0 5V_SB 2V - IC pin8 -2V - IC pin4...
  • Page 11 Fault flow chart @uPH8 5V_CD 9V_CD Mains supply P0 @back of display 5V_SB @Headphone jack -2V +2V...
  • Page 12 Fault flow chart Fault symptom: - Fault in voltages Possible causes: Measure connection Measure mains supply Re-establish - PCB6, SMPS to Socket, PCB Fuse F0 OK? connection - Connections Measure 2V, -2V, Measure all 6V 5V_SB connections in BS4 are all right Change PCB6, SMPS Fault symptom:...
  • Page 13 Fault flow chart Fault symptom: - No stand-by light - Unable to use/remote BS4 Possible causes: Measure mains supply Replace defect fuse - PCB6, SMPS Fuse F0 OK? - Fuse F0 Connections from PCB6 to other Re-create connection boards OK? Replace PCB6, SMPS Fault symptom: - No sound in headphone...
  • Page 14 Fault flow chart Fault symptom: Connection to PCB5, Change defect PCB5, - Unable to remote with turn wheel Both wheels defect PCB3 and keyboard Turn wheel Possible causes: - Connection not OK - Defect turn wheel - PCB3, Magic open defect Connection to PCB5, Re-establish PCB3, PCB6 and...
  • Page 15 Fault flow chart Establish the fault with Fault symptom: Establish fault customer’s CD - Unable to play CD (test CD) symptom with B&O Check the disk for - No disc rotation Test CD visible defects - Playback with SD card OK Report fault and send Fault symptoms - Cable connection to CD PCB OK...
  • Page 16 Fault flow chart Fault symptom: Measure connections Re-establish - Fault in display to the display is OK? connection - Only a few lines are faulty Possible causes: - PCB0, display - Connections to display Change PCB0, Change PCB2, Master Display Fault symptom: - Fault in display - Nothing in display...
  • Page 17 Fault flow chart Fault symptom: - Unable to play DAB Replace PCB6, SMPS Measure voltages +6V - CD plays OK - FM plays OK Possible causes: - PCB3, DAB - PCB6, SMPS DAB aerial is mounted Measure connections to DAB OK Replace PCB3, DAB Lift the glass so the keyboard is visible...
  • Page 18 2.0 Fault flow chart Fault symptom: Connection to PCB8, Re-establish - The front glass slides to the top Tacho connection without stopping above the keyboard Possible causes: - PCB8, Tacho Change PCB8, Tacho Replace PCB2, Master Replace motor unit Fault symptom: Check if the magnet - Unable to load CD on the door...

  • Page 19: Placement Of Magnet

    Fault flow chart 2. Placement of magnet...
  • Page 20 2.2...

  • Page 21: Service Mode

    Service Mode...
  • Page 22 Service Mode...

  • Page 23: Service Tips

    Service tips 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 laptop.

  • Page 24: Repair Tips

    Repair tips Repair tips 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 mechanism or 96Module is removed.

  • Page 25: Replacement Of Modules

    Replacement of modules 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 6P08 Main Replacement of the Main microcomputer PCB6 (µPH8)

  • Page 26: Disassembly Overview

    Replacement of modules Disassembly overview Module name Page Socket Master Magic Light Turn wheel 5.0 Main microprocessor Codec 5. Tacho 5.2 Headphone 5.3 Display 5.4 SD/MMC card reader 5.5 Switch 5.6 37Module 5.20 SMPS 5.7 FM tuner 5.8 96Module CD unit 5.9 Cabinet 5.2...
  • Page 27 BeoSound 4 in service position - Remove all cables - Push front glass to top position and remove it - Remove screw covers at top - and all screws TX10 - Remove cables Plug with lock! 8P and 5P2...

  • Page 28: Beosound 4 In Service Position

    Remove Chassis + 5.3 BeoSound 4 in Service Position - Remove screws at socket panel TX10 - Remove screws at front TX10 - Remove cables 2P1002 2P1009 - Pull out chassis...
  • Page 29 Replace PCB, Socket + 5.3 BeoSound 4 in Service Position + 5.4 Remove Chassis - Remove plugs 85P100 7P101 - Pull off socket cover Snap-locks! - Remove plugs - Remove screws GND! TX20...
  • Page 30 Replace PCB2, Master + 5.3 BeoSound 4 in Service Position + 5.4 Remove Chassis - Remove screws and release snaplocks TX10 ➁ ➀ - Remove plugs 76P103 2P1003 - Remove electrical chassis from mechanical chassis - Remove cables PCB2 2P1004 2P1008...

  • Page 31: Socket

    Replace PCB2, Master - Remove screws TX10 - Remove plugs on the back of PCB2 2P1005 2P1013 2P1010 2P1012 2P1011 - Transfer EEPROM software EEPROM PCB6 EEPROM SOCKET Use IC-pliers for replacement (part no. 362945)

  • Page 32: Magic

    Replace PCB3, Magic + 5.3 BeoSound 4 in Service Position + 5.4 Remove Chassis - Remove screws - Remove PCB3, Magic ➀ ➁ ➀ - Remove PCB9, Headphone ➀ ➀ ➁...

  • Page 33: Light

    Replace PCB4, Light + 5.3 BeoSound 4 in Service Position + 5.27 Remove finger niche - Remove PCB4, Light...
  • Page 34 Replace PCB5, Turn wheel and parts (left and right) 5.0 + 5.3 BeoSound 4 in Service Position - Remove cable - Release snaplocks and push out ➀ Snaplock! ➁ ➀ - Dismantle turn wheel TX10 PCB5 Base Wheel...
  • Page 35 Replace PCB7, Codec 5. + 5.3 BeoSound 4 in Service Position + 5.4 Remove Chassis - Remove screws and release snaplock TX10 ➁ ➀ - Remove electrical chassis from mechanical chassis - Remove plugs 7P101 7P100 - Remove screw TX10...
  • Page 36 Replace PCB8, Tacho 5.2 + 5.3 BeoSound 4 in Service Position + 5.4 Remove Chassis + 5.23 Remove Clamper unit - Remove screws and plug TX10 - Remove screws TX10 - Remove drive belt - Remove plug and gear wheel...

  • Page 37: Headphone 5.3

    Replace PCB9, Headphone 5.3 + 5.3 BeoSound 4 in Service Position + 5.4 Remove Chassis ➀ + 5.8 Remove PCB3, Magic - Remove PCB9, Headphone ➀ ➁...
  • Page 38 Replace PCB0, Display 5.4 + 5.3 BeoSound 4 in Service Position - Remove screws TX10 - Remove cable Plug with lock! CON CON1...

  • Page 39: Sd/Mmc Card Reader 5.5

    Replace PCB, SD/MMC card reader 5.5 + 5.3 BeoSound 4 in Service Position - Remove screws - Pull out PCB, SD/MMC card reader...
  • Page 40 Replace PCB2, Switch 5.6 + 5.3 BeoSound 4 in Service Position + 5.4 Remove Chassis - Remove screw...

  • Page 41: Smps 5.7

    Replace PCB6, SMPS 5.7 + 5.3 BeoSound 4 in Service Position + 5.4 Remove Chassis - Remove screws and release snaplock TX10 ➁ ➀ - Remove electrical chassis from mechanical chassis - Remove plugs 7P101 7P100 - Remove screws TX10...
  • Page 42 Replace PCB85, FM tuner 5.8 + 5.3 BeoSound 4 in Service Position + 5.4 Remove chassis - Remove screws TX10 - Remove plugs on th back of PCB85 85P106 85P103 85P100...

  • Page 43: Remove Chassis

    Replace 96Module, CD unit 5.9 + 5.3 BeoSound 4 in Service Position + 5.4 Remove Chassis - Remove screws and release snaplock TX10 ➁ ➀ - Remove electrical chassis from mechanical chassis - Remove screws TX10 - Pull off CD unit...
  • Page 44 Replace 37Module, DAB 5.20 + 5.3 BeoSound 4 in Service Position + 5.4 Remove chassis - Remove plugs 37P201 37P101 - Remove screws TX10...

  • Page 45: Cabinet

    Replace Cabinet 5.2 + 5.3 BeoSound 4 in Service Position + 5.4 Remove Chassis + 5.8 Remove PCB3, Magic + 5.24 Remove Base...

  • Page 46: Clamper Cover

    Replace clamper cover 5.22 + 5.3 BeoSound 4 in Service Position + 5.4 Remove Chassis + 5.23 Remove Clamper unit - Release snaplocks...
  • Page 47 Replace Clamper unit 5.23 + 5.3 BeoSound 4 in Service Position + 5.4 Remove Chassis + 5.9 Remove CD unit - Remove screws TX10 - Lift off clamper Note! Take care that the arm is placed correctly...

  • Page 48: Base

    Replace Base 5.24 + 5.3 BeoSound 4 in Service Position + 5.4 Remove Chassis - Remove screws TX10...

  • Page 49: Door Mechanism

    Replace door mechanism 5.25 + 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  ...

  • Page 50: Drivebelt

    Replace drivebelt 5.26 + 5.3 BeoSound 4 in Service Position + 5.4 Remove Chassis + 5.23 Remove Clamper unit - Remove screws and plug TX10 - Remove screws TX10 - Remove Drivebelt...
  • Page 51 Replace Finger niche 5.27 + 5.3 BeoSound 4 in Service Position - Remove screws - Remove finger niche Note: lift free of “lock” ➁ ➀...

  • Page 52: Finger Niche

    Replace keyboard 5.28 + 5.3 BeoSound 4 in Service Position + 5.5 Remove SD/MMC card reader + 5.27 Remove finger niche - Remove cables - Remove screws - Pull out keyboard...

  • Page 53: Motor

    Replace motor 5.29 + 5.3 BeoSound 4 in Service Position + 5.4 Remove Chassis + 5.23 Remove Clamper unit - Remove screws and plug TX10 - Remove screws TX10 - Remove drivebelt - Remove screws and plug...
  • Page 54 5.30...
  • Page 55 Specification guidelines for service use 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...

  • Page 56: Specification Guidelines For Service Use

    Specification guidelines for service use ≥92dB Dynamic range (kHz) ≤±dB Channel unbalance (kHz) 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 Audio Codec playback...
  • Page 57 Specification guidelines for service use Audio Aux Input/Output x  AUX in L/R Phono 2V RMS 22 – 47kW AUX out L/R Phono .3V RMS ±0.2 <kW Power Link Front & Rear Pin  PL ON = >2.5V, OFF = <0.5V Pin 2 Signal GND Pin 3...

  • Page 59: Wiring Diagram

    Wiring diagram Wiring diagram Wiring diagram 6200094 P1001 P102 < < < < < < < < Display Tuner DAB Master < < < < >< >< >< >< >< >< >< >< >< >< FFC 0.5mm 30/30pins Socket 6200095 P1002 7211386 <...

  • Page 60: Available Parts

    Available parts Available parts Available parts 9004 BeoSound 4 9005 See page 8.5 9006 Incl. pos. no. 5 9007 Incl. PCB12 See page 8.4 9001 Incl. pos. no. 5 9008 9009 See page 8.3 9002 Incl. pos. nos. 9011, W9, PCB9 9010 9003 9011...

  • Page 61: Available Parts

    Available parts 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/LAT...
  • Page 62 Available parts Front Incl. 2 x PCB4 9012 Incl. pos. no. 9016 9013 9016 Incl. PCB5 9014 9015 Incl. PCB5 9014 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...
  • Page 63 Available parts CD unit and Motor 9018 9017 96Module 9020 9019 9021 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 Screws 2052011 Screw 3 x 10mm...
  • Page 64 Available parts Electrical chassis 9025 9028 9029 9026 9030 9027 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.
  • Page 65 Available parts Wire bundles See wiring diagram page 7.1. The part no. is printed on the diagram above the wire bundle, as shown. 6200094 P1001 < < < < < < < < Display < < Master < < > < >...
  • Page 66 Available parts Packing 9301 9302 9301 9303 9301 3396308 Foam, set of top and bottom 9302 3917143 Foam foil 9303 3392385 Outer carton...
  • Page 67 Available parts Floor Stand 2180 1218011 9102 Incl. pos. nos. 9102, 1 9101 9301 9302 9301 9103 9303 9104 9101 3932012 Tube incl. pos. nos. 9102, 1 9102 2369003 Cable clip 9103 3162237 Cover plate 9104 3103391 Rubber foot 2046017 Screw 6 x 16mm 3390065 Bag w/parts...
  • Page 68 Available parts Wall bracket 2181 1218111 2019035 Screw 4 x 12mm 3390071 Bag w/parts 3507400 Guide...
  • Page 70 Bang & Olufsen DK-7600 Struer Denmark Phone +45 96 84 11 22* Fax +45 97 85 39 11 3538035 04-06...

This manual is also suitable for:

Beosound 4 2855Beosound 4 2852Beosound 4 2857Beosound 4 2858Beosound 4 2859Beosound 4 2860 ... Show all

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