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Bang & Olufsen Beolab 4000 MKII 6642 User Manual

Bang & Olufsen Beolab 4000 MKII 6642
26 pages
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BeoLab 4000 MKII
Type 6642, 6643, 6644, 6645, 6646, 6647, 6648
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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Bang & Olufsen Beolab 4000 MKII 6642 Specifications

General IconGeneral
Frequency response50 - 20, 000 Hz
Weight3.6 kg
Amplifier power100 W
Cabinet principleBass reflex
TypeActive speaker
Power output100 W
Frequency range55 - 20, 000 Hz
Woofer100 mm
Dimensions W x H x D280 x 420 x 240 mm
Woofer Size100 mm
InputsRCA
FinishAluminum

Summary

Service Procedures

Front Line Service Guidelines

Procedures for servicing at customer location.

Troubleshooting and Fault Finding

Methods for diagnosing and locating faults.

Safety Warnings and Tests

ESD Protection Measures

Importance of ESD-mat for electronic components.

Insulation Test Procedure

Step-by-step guide for insulation testing.

Component Adjustments

Main PCB Adjustment

Setting potentiometers after Main PCB replacement.

Bass and Treble Level Tuning

Adjusting audio output levels for bass and treble.

Troubleshooting and Repair Tips

Loudspeaker Hum Resolution

Tips for fixing hum issues in the loudspeaker.

SMPS Testing Procedure

Steps to verify the Switch Mode Power Supply.

Module Replacement Process

Static Discharge Prevention

Essential ESD precautions for module handling.

Service Preparation: Part 1

Cable Disconnection Steps

How to safely disconnect cables from the unit.

Front Frame Removal Guide

Instructions for removing the front frame.

Service Preparation: Part 2

Speaker Cable Disconnection

How to disconnect cables connected to speaker units.

PCB01 Amplifier Replacement

Removing Amplifier Screws

Steps to unscrew the amplifier module.

PCB02 SMPS Replacement

PCB03 Main PCB Replacement

PCB04 LED Replacement

System Diagrams

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