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Bang & Olufsen BeoLab 12-3, Service Manual

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Bang & Olufsen BeoLab 12-3 Service Manual Download Page 47

Assembly process     5.5

Assembly process (screw sequence)

10mm

(x1)

TX20

10mm

(x2)

TX20

22mm

(x4)

TX20

10mm

(x4)

TX20

10mm

(x2)

TX10

10mm

(x2)

TX20

10mm

(x14)

TX20

8mm

(x8)

TX10

 

 

Look into the screw holes to ensure that no wires are 
in the way, before mounting the screws.

Follow the screw sequence below:

Be careful not to tighten the screws too hard. If 
the screws are tightened too hard, there is risk of 
damaging the screw bosses.

Sequence: 

Tighten the screw marked 

Tighten the screws marked 

Tighten the screws marked 

Tighten the screws marked 

Tighten the screws marked 

Tighten the screws marked 

Tighten the screws marked 

Tighten the screws marked 

When the top cabinet is to be assembled with the base 
cabinet, the screws must be tightened in the following 
sequence.

Summary of Contents for BeoLab 12-3

Page 1: ...ce Manual version 1 0 English German French Italian Spanish Dutch Japanese Korean and Simplified Chinese versions are available in the Retail System This Service Manual must be returned with the defec...

Page 2: ...lt flow chart 2 1 Adjustments 3 1 Replacement of modules 4 1 Before assembly process Assembly process Final check after repair 5 1 Specification guidelines for service use 6 1 Block diagram 7 1 Wiring...

Page 3: ...DSE PCB35 ICEpower amplifier x3 PCB40 Interconnection PCB41 V CON not present in all versions PCB47 LED Indicator PCB48 NTC x3 PCB68 Signal Switch Speaker units Tweeter unit Midrange unit Woofer cosco...

Page 4: ...error code on the Exchange Module section and print it b Use the error code when troubleshooting c Return the error code in the Retail Order System d Before returning the product to the customer clear...

Page 5: ...RICITY MAY DESTROY THE PRODUCT Waste of Electrical and Electronic Equipment WEEE Electrical and electronic equipment parts and batteries marked with this symbol must not be disposed of with normal hou...

Page 6: ...1 4...

Page 7: ...rror log 2 3 Test Sound 2 4 Speaker unit check 2 5 NTC module test 2 5 Fault flow chart No function No LED indication 2 6 No power ON Red LED indication 2 8 LED indicator is orange constant lit 2 10 L...

Page 8: ...e to overheating and have shortly turned off one or more amplifiers shortly Over current protection circuit switched off amplifier shortly Flashing The product is having a fail Product will not revert...

Page 9: ...rocedure below Remove the service lid next to the mains inlet Connect the ServiceTool hardware from the service connector on the product to the service PC as shown Run ServiceTool Be sure that Service...

Page 10: ...rpose use ServiceTool and refer to the test section The Test Sound section features a sound generator which allows the user to send a pure sound directly to the speaker unit This feature makes trouble...

Page 11: ...the speaker unit unless they have been damaged by accident NTC module test Measure the resistance of the NTC module to determine if the fault is caused by a defective speaker unit or the NTC module I...

Page 12: ...roduct switch on Fault in Power Link connection source Check connection Confirm 3V at PCB04 P4 pin 8 OK Confirm mains voltage at PCB04 P1 pin 1 2 OK Replace defective PCB04 SMPS Fault in cable connect...

Page 13: ...tal Sound Engine DSE Signal Switch 68 P1 14 14pins P1 14 14pins P5 12 12pins P6 11 11pins P7 12 12pins W9 P8 14 14pins W1 P2 RJ45 Service P4 RJ45 P3 4 4pins W1 1 1pins PCB04 P4 pin information P3 P2 P...

Page 14: ...Check connection Confirm 3V at PCB04 P4 pin 8 OK Confirm 33V at PCB04 P3 pin 4 33V at PCB04 P3 pin 2 OK Confirm mains voltage at PCB04 P1 pin 1 2 OK Replace defective PCB04 SMPS Fault in cable connect...

Page 15: ...tal Sound Engine DSE Signal Switch 68 P1 14 14pins P1 14 14pins P5 12 12pins P6 11 11pins P7 12 12pins W9 P8 14 14pins W1 P2 RJ45 Service P4 RJ45 P3 4 4pins W1 1 1pins PCB04 P4 pin information P3 P2 P...

Page 16: ...he new module Reconnect the product to the mains and connect ServiceTool Read out the error log Any useful information Replace the suspected module related to the error log Measure the temperature of...

Page 17: ...5 Service P4 RJ45 P3 4 4pins W1 1 1pins PCB04 P4 pin information P3 P2 P4 P7 P1 2 1 1 2 4 1 1 2 11 12 1 2 7 8 04 P3 P2 P4 4 1 1 2 11 12 1 2 7 8 04 P1 12 12pins P4 4 4pins W6 W8 2 41 W CON1 P2 4 4pins...

Page 18: ...rheated speaker unit and measure the resistance wires disconnected Woofer 6 5 Midrange 3 6 Tweeter 6 5 OK Reconnect the product to the mains and connect ServiceTool Read out product ID Is all product...

Page 19: ...Service P4 RJ45 P3 4 4pins W1 1 1pins PCB04 P4 pin information P3 P2 P4 P7 P1 2 1 1 2 4 1 1 2 11 12 1 2 7 8 04 P3 P2 P4 4 1 1 2 11 12 1 2 7 8 04 P1 12 12pins P4 4 4pins W6 W8 41 W CON1 s P2 4 4pins s...

Page 20: ...drive control at PCB30 P8 pin 12 OK Replace defective PCB41 V CON Replace defective PCB30 Digital Sound Engine Replace the suspected module related to the error log Confirm that line switch settings i...

Page 21: ...12 1 2 7 8 04 P3 P2 P4 4 1 1 2 11 12 1 2 7 8 04 30 P11 P1 P5 P8 P7 P6 P9 1 3 BARCODE 1 11 1 11 1 14 1 12 2 12 1 6 1 13 2 14 30 P11 P1 P5 P8 P7 P6 P9 1 3 1 11 1 11 1 14 1 12 2 12 1 6 1 13 2 14 PCB30 P...

Page 22: ...ier Replace and use ServiceTool to calibrate the new module Connect the cable for ServiceTool to the service connector Any useful information error history usage data Replace the suspected speaker uni...

Page 23: ...tal Sound Engine DSE Signal Switch 68 P1 14 14pins P1 14 14pins P5 12 12pins P6 11 11pins P7 12 12pins W9 P8 14 14pins W1 P2 RJ45 Service P4 RJ45 P3 4 4pins W1 1 1pins PCB04 P4 pin information P3 P2 P...

Page 24: ...2 18...

Page 25: ...Adjustments 3 1 Adjustments Information 3 2 Chassis PCB30 Digital Sound Engine 3 2 Speaker Driver 3 3 Amplifier 3 3 LED settings 3 3 Software udpate 3 4...

Page 26: ...Digital Sound Engine backup function is not possible Restore product data from factory data ID Restore Calibration of amplifiers done automatically PCB35 ICEpower amplifier Calibration of amplifiers S...

Page 27: ...e aim is to ensure optimal sound even if the new speaker unit had to vary from the old speaker unit Use the read function to enable the calibration data fields The procedure for the calibration functi...

Page 28: ...erience Follow the procedure below Approach Connect a service PC with ServiceTool Follow the procedure below Remove the little service lid next to the mains inlet Connect the ServiceTool hardware from...

Page 29: ...disassembled or modules are being handled Notice All modules must be placed on the ESD mat or in an ESD proof bag After replacement of modules Back up product data from the old PCB30 Digital Sound En...

Page 30: ...the screws from falling out of the product and get lost Remove all cables from the product Loosen screws holding the front Disconnect the two cables to the tweeter and remove the front as shown Remove...

Page 31: ...front baffle Reconnect and mount the midrange speaker as shown The product is now in service position GND GND 8mm x8 TX10 10mm x2 TX10 12mm x2 TX20 Remove screws and lift up the speaker unit Disconne...

Page 32: ...s cable Disconnect cables x7 Remove screws and the GND wire Remove PCB30 and the shield plate Replace PCB30 Digital Sound Engine After repair use ServiceTool to copy the serial number into PCB30 DSE w...

Page 33: ...Replacement of modules 4 5 Disconnect cables x4 4 2 BeoLab 12 3 in service position Remove screws and PCB04 Replace PCB04 SMPS 8mm x3 TX10 10mm x1 TX10...

Page 34: ...iers x2 Disconnect cables x4 4 2 BeoLab 12 3 in service position Remove screws and PCB35 Replace PCB35 ICEpower amplifier 8mm x4 TX10 6mm x2 TX10 Tweeter midrange amplifier Remove screws and lift up P...

Page 35: ...screws just been unscrewed from the speaker and collect the screws for safekeeping This is to prevent the screws from falling out of the product and get lost Remove all cables from the product Loosen...

Page 36: ...ed from the speaker and collect the screws for safekeeping This is to prevent the screws from falling out of the product and get lost Remove all cables from the product Loosen screws holding the front...

Page 37: ...cement of modules 4 9 4 2 BeoLab 12 3 in service position Replace PCB48 NTC Remove cooling pad Remove screw and PCB48 NTC The disassembly procedure is basically the same for the other NTC unit 12mm x1...

Page 38: ...4 10 Replacement of modules Replace PCB68 Signal Switch Remove screws Lift the shield plate slightly and remove PCB68 4 2 BeoLab 12 3 in service position 8mm x4 TX10...

Page 39: ...mbly procedure is basically the same for the other NTC unit Remove screws and cableholders Disconnect wires from the speaker terminals and remove the woofer unit Use ServiceTool to align the deviation...

Page 40: ...sion 10mm x4 TX10 Use a screwdriver to release the screws just unscrewed from the speaker and collect the screws for safekeeping This is to prevent the screws from falling out of the product and get l...

Page 41: ...just unscrewed from the speaker and collect the screws for safekeeping This is to prevent the screws from falling out of the product and get lost 18mm x1 TX10 10mm x2 TX10 Replace tweeter unit Remove...

Page 42: ...lens unit Remove the filt gasket and the LED lightguide Use a peeler to gently remove the decorative top plate Use ServiceTool to align the sensivity value printed on the new tweeter unit Please refer...

Page 43: ...ables being damaged when assembled Refer to page 5 4 to see a survey of correct wire placement Safety cable ties There are three locations where lashing of wires with cable ties are required This is v...

Page 44: ...5 2 Before assembly process Large screw boss Small screw boss Screw hole woofers Mounting post Rubber sealings Set of sealings Cabinet sealing Cable holder Survey of critical assembly items...

Page 45: ...ed incorrectly they will be damaged when the cabinet is assembled with the front baffle Mounting post The mounting posts must be totally free from wires If the wires are mounted incorrectly they will...

Page 46: ...5 4 Before assembly process Wire placement Cable tie Cable tie Cable tie Wire holders Wires not present in all versions...

Page 47: ...ence below Be careful not to tighten the screws too hard If the screws are tightened too hard there is risk of damaging the screw bosses Sequence Tighten the screw marked Tighten the screws marked Tig...

Page 48: ...ng the aluminium front When the aluminium front is to be assembled with the speaker cabinet the screws must be tightened in the following sequence 12mm x1 TX20 12mm x1 TX20 12mm x1 TX20 12mm x1 TX20 1...

Page 49: ...tage of 2 5 kV ac is obtained Maintain the voltage level for one second then slowly decrease the voltage to 0 V ac Restore setup Before the product is handed over to the customer ensure that The posit...

Page 50: ...5 8...

Page 51: ...8 mm Tweeter 19 mm Indication LED Green On Red Standby Orange Protection Protection Melting fuse for mains Adaptive Bass Linearisation ABL Thermal protection NTC sensor Features Line sense auto on off...

Page 52: ...Effective Frequency range 45 3 23 900 Hz Connectors POWER LINK x2 Pin 1 Not used Pin 2 PL_Data Pin 3 Signal GND Pin 4 Speaker ON on 2 5V off 0 5V via source Pin 5 Not used PL power up Pin 6 Audio Rig...

Page 53: ...Gain Ranging 12V 30V 18V PL RJ45 PL_L LED driver Red Green PWM Debug JTAG ICE power 2ch Amp PL RJ45 SW2 Line_EN_ dB OC ATI RJ45 PL_R Signal switch Par ser 2 x 8 SPI_A Red Green PWM JTAG in RJ45 ATI co...

Page 54: ...P2 2 2pins W1 41 V CON 1 2 P1 4 4pins P2 4 4pins P3 2 2pins P4 4 4pins P5 4 4pins W5 W4 P2 RJ45 Service P4 RJ45 PowerLink P3 RJ45 PowerLink P2 2 2pins P11 3 3pins P9 6 6pins W12 W13 48 35 ICEpower am...

Page 55: ...s P1 14 14pins W10 1 1pins P5 12 12pins P6 11 11pins P7 12 12pins W14 W10 W8 W16 W9 P8 14 14pins Interconnection 40 P2 2 2pins W1 P2 RJ45 Service P4 RJ45 PowerLink P3 RJ45 PowerLink P2 2 2pins P11 3 3...

Page 56: ...11 11 13 13 9 9 10 10 9 9 9 9 20 20 9022 16 16 17 17 17 17 26 26 16 16 17 17 17 17 16 16 17 18 19 13 16 13 17 17 17 17 16 22 24 24 24 24 24 24 21 21 21 20 20 20 16 16 16 22 22 22 20 20 20 21 21 27 27...

Page 57: ...9025 3332130 Damping material complete incl pos no 9014 9026 8480468 Woofer 9027 3160741 Shielding foil 9028 3170367 Isolation paper 9029 3302484 Shield 9030 2950293 Tube fixation 9031 3440320 Plastic...

Page 58: ...5 2576376 Rubber spacer 26 3170379 Gap pad 27 3376236 Gap pad 28 2013288 Spacer 29 2015163 Screw 4 x 20mm 30 2015001 Screw 4 x 12mm Wire bundles W1 6278753 Wire shielding W2 6278616 Wire mains W14 627...

Page 59: ......

Page 60: ...Bang Olufsen DK 7600 Struer Denmark 3538176 12 02...

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