Bang & Olufsen BeoLab 3500 MKII 1601 Service Manual
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Bang & Olufsen BeoLab 3500 MKII 1601 Service Manual

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BeoLab 3500 MKII
Type 1601, 1602, 1603, 1604, 1605, 1607, 1608
from serial no. 19343452
Service Manual
English
German and French, versions are available in the Retail System

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Summary of Contents for Bang & Olufsen BeoLab 3500 MKII 1601

  • Page 1 BeoLab 3500 MKII Type 1601, 1602, 1603, 1604, 1605, 1607, 1608 from serial no. 19343452 Service Manual English German and French, versions are available in the Retail System...

  • Page 2: Table Of Contents

    CONTENTS Survey of modules ..................1.1 Adjustments ....................2.1 Repair tips ..................... 3.1 Disassembly ....................4.1 Insulation test ....................5.1 Specification guidelines for service use ............6.1 Wiring diagram ..................... 7.1 Block diagrams ..................7.3 – 7.5 Available parts ....................8.1...

  • Page 3: Survey Of Modules

    Survey of modules Seen from the front Seen from the back 32 35 Switch Mode Power Supply DC/DC Converter Transformer left Transformer right Power Amplifier left Power Amplifier right LF Supply and Control Cross Field Plug PCB Display, Keyboard and IR Receiver Microcomputer...

  • Page 5: Adjustments

    Adjustments ADJUSTMENTS When replacing IC, LM3578, on PCB2, Switch-Mode Power Supply, the supply voltage may have to be adjusted to 5V ±0.25V by means of R2 and R0: If 5V is above level, install R2 (R//R2). If 5V is below level, install R0 (R3//R0). SPEAKER Adjustment of bass/treble sound level.

  • Page 6: Replacement Of Pcb36 Microcomputer

    Adjustments Replacement of PCB36, Microcomputer The bass and treble levels of the speakers are stored electronically in the Microcomputer (PCB36). When replacing PCB36, the original bass and treble level values must be restored: Install the new Microcomputer (see section 4, Disassembly, if necessary). In TEST MODE 0, enter the values printed on the label in the socket well: LT (left treble) : X LB (left bass)
  • Page 7 Repair tips REPAIR TIPS BeoLab 3500 can be brought into TEST MODE from stand-by with a Beo4, giving access to the following functions: TEST MODE 00 Display of: Software version number and time of operation in Audio mode, Video mode and stand-by. Press MENU 0 0 GO.

  • Page 8: Repair Tips

    Repair tips ERROR : Error during address configuration. No address has been allocated because too many units are connected to the BeoLink. Remove all products from BeoLink, and connect them again one at a time until the error code occurs. Disconnect that product from BeoLink. ERROR 2: It is not possible to transmit on BeoLink, because it has been pulled low.

  • Page 9: Disassembly

    Disassembly DISASSEMBLY Front fabric frame Push the front fabric frame to the side and lift it off. When both front fabric frames have been removed, PCB35, Display, Keyboard & IR receiver, PCB36, Microcomputer, and PCB32, Cross field, are accessible: Remove the display glass (two screws) and the two plastic covers (four screws). PCB35 can now be tilted out into service position, thereby also providing access to PCB36 and PCB32.
  • Page 10 Disassembly Service position Important! The display glass and cabinet must be protected against scratches by placing them on a soft base. Remove the sixteen screws, A, behind the front fabric frames. Place the front face down. Remove the socket well by first removing the two Allen screws. Lift the cabinet up and off carefully.

  • Page 11: Insulation Test

    Insulation test INSULATION TEST Each set must be insulation tested after dismantling. The test is to be performed when the set has been re-assembled and is ready for delivery to the customer. Make the insulation test as follows: Short-circuit the two plug pins of the mains plug and connect one of the terminals of the insulation tester.

  • Page 13: Specification Guidelines For Service Use

    Specification guidelines for service use SPECIFICATION GUIDELINES FOR SERVICE USE BeoLab 3500 MKII Type 60 (EU), 602 (GB), 603 (USA-CDN), 604 (JAP), 605 (AUS) 607 (KOR), 608 (CHK) Concept X-tra room product Active stereo loudspeaker with control circuitry, stand-by relay and IR receiver Operation Local operation...
  • Page 14 Specification guidelines for service use Power amplifiers Rated power woofer 35W, 8W Rated power tweeter 35W, 8W Amplifier signal-to-noise ratio > 80 dBA, W/8W Signal-to-noise ratio > 74 dBA, full volume Frequency range 20 - 20,000 Hz +0 - dB Harmonic distortion <...

  • Page 15: Wiring Diagram

    Wiring diagram Wiring diagram Wiring diagram L LEV PFAIL MLCON MICRO MCLRX COM- MCLTX MLRX PUTER MLTX MAINS STKEY PLUG PCB 230VAC PLIM DATA 230VAC CLOCK SWITCH MODE REL1 REL2 BAS L POWER SUPPLY TREB L PLIM POWER AMPLIFIER TRANSFORMER LEFT PMUTE PFAIL LEFT...
  • Page 17 Block diagram Block diagram TRANSFORMER LEFT SWITCH MODE POWER SUPPLY CROSS DISPLAY, FIELD KEYB.&IR P19-2 MAINS IN P23-4 P21-4 5V ST.BY 5V ST.BY 5V ST.BY P23-3 P9-18 P21-3 P4-1 P2-3 P19-1 P24-1 5VA ST.BY P2-4 P9-17 REL1 1V 1 P21-1 P23-1 LM3578 µC...
  • Page 18 Block diagram Block diagram PLUG PCB CROSS FIELD MLD- MLD- P7-1 P3-14 MLD+ MLD+ P7-2 P3-13 MASTER LINK P5-3 SDA, SCL 3/4IC1 P5-2 PL DATA PL D 8V5 =>15V P3-1 PL DATA P7-14 TR3,4,5 P17-3 P17-2 SOUND CONTROL DISPLAY, KEYBOARD & IR ML DATA V ML V ML...
  • Page 19 Block diagram Block diagram Block diagram for Power amplifier POWER AMPLIFIER TREBLE FILTER, 4. ORDER HP TREBLE IN POWER AMPLIFIER TREBLE P2-5 IC100 P1-1,2,3,4 4558 IC100 4558 STK4171V D200 TREBLE -35V MUTE TREBLE PROTECT TRANSISTOR PA MUTE PFAIL TO IC1 PIN 6 P1-9,10,11,12 TO PCB3 ?P P2-8...
  • Page 20 Available parts Available parts Available parts 9008 9009 BeoLab 3500 9011 9010 9022 9023 9012 9013 9014 9015 9001 9016 9002 9017 9003 9004 9005 9006 9007 9018 9019 9020 9021...

  • Page 21: Available Parts

    Available parts Available parts 902 3332055 Damper 900 2576302 Distance bolt 9002 34422 Chassis 903 370300 Insulating piece 9003 8480340 Tweeter 904 35224 Wire holder 9004 3907064 Rubber 905 6276907 Mains socket 9005 3950053 Rubber belt 906 364935 Cover 9006 345207 Front piece 907 34406 Chassis f.
  • Page 22 Available parts Accessories 303302 Wall bracket, type 607 303235 Wall bracket 339048 Bag with parts f/Wall bracket 303333 Wall plate 3390468 Bag with parts f/Wall plate 606 Table stand 3390480 Bag with parts f/table stand 2560276 Cable cover, 0 pieces Parts not shown 3947547 Foam, 3x9mm x 0m 3947350 Foam, 3x7mm x 0m...
  • Page 24 Bang & Olufsen DK-7600 Struer Denmark Phone +45 96 84 11 22* Fax +45 97 85 39 11 06-06 A...

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