Bang & Olufsen Beolab 4000 MKII 6642 Service manual

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 !
CONTENTS
Survey of modules ..................................................................... 1.1
How to service ........................................................................... 1.2
Warnings – Insulation test . ........................................................ 2.1
Adjustments .............................................................................. 3.1
Repaie tips ................................................................................. 4.1
Replacement of modules ........................................................... 5.1
Specification guidelines for service use ....................................... 6.1
Block diagram . .......................................................................... 7.1
Wiring diagram . ........................................................................ 7.1
Available parts ........................................................................... 8.1
Survey of modules
Survey of modules
3
1
2
4
PCB01
Amplifier
PCB02
SMPS
PCB03
Main PCB
PCB04
LED
1.1
1.2
How to service
How to service
Front line service
BeoLab 4000 MKII is to be serviced in the customer’s home when it comes to
electrical symptoms or exchange of mechanical parts. In this way you avoid having
to make more than one visit and using minimum of time on the case, all for the
benefit of the customer.
BeoLab 4000 MKII has been split-up into as few service items as possible. Each
service friendly item is packed individually, prepared for worldwide transport, and
has a separate seven digit spare part number to be found in the Service Manual or
on the Bang & Olufsen Retail System. The exploded view drawing will show the
service spare parts.
All necessary electrical modules and the two loudspeaker units can be ordered to
prepare front-line service. Cabinet parts must also be brought with you separately,
if to be replaced in the customer’s home.
To improve the quality and secure a better service please send the defective part
for quality analyse purposes to:
Att:
Bang & Olufsen Operation a/s
Att.: JEB 7210-3
Peter Bangsvej 15
DK-7600 Struer
Please remember to fill-in a fault description (part no.: 3542206).
Delivery
There is several type numbers for BeoLab 4000 MKII, however, this is only due to
market approvals. All types can be used on all markets with 100 to 240 V (ac)
mains voltage. When you order BeoLab 4000 MKII (set of two) two mains cables
and two Power Link cables are included.
Installation and setting-up
Only the switch for Left, Right or Line must be set into correct position as
described in the User Guide, before Power Link or a Line signal and AC power
wires are connected. If Power Link is used, the switch is for Left or Right setting. If
a Line signal (0 to 1V) is connected (via phono-male to PL Line-in) part no. see
Parts not shown) the switch must be set to Line position. See more details in the
User Guide. The LED will indicate on (green) or off (red).
Fault Finding
Before troubleshooting is initiated, let the customer demonstrate the fault, if
possible. There are four electrical modules in the product. Therefore a faulty
module is easy to point out in most cases. The PCB’s has been divided into:
PCB01, Amplifier - PCB02, SMPS - PCB03, Main PCB and PCB04, LED.
No special service programs are available in this product or via the ServiceTool.
If there is a fault in the PCB02, SMPS or PCB01, Amplifier the LED is typically off.
Replacement
Each loudspeaker is individually adjusted from production to ensure optimal stereo
perspective. When replacing a speaker unit bass/treble level have to be adjusted.
On the back of the new unit will be printed a rated value for the sensitivity of the
particular unit. The rated value is rated in dB.
Warnings – Insulation test
2.1
Warnings
ESD
When electrical replacement or disassembly is taking place, use an ESD-mat. The
internal electronics are very sensitive to static electricity.
ESD
ESD-Mat
Handling
Wear cotton gloves to avoid any fingerprints on the product.
The surfaces on the product are very sensitive, so handling should be done with
great care to avoid damage.
Cleaning
Clean the surfaces of the BeoLab 4000 MKII using a soft, lintfree cloth which you
have wrung firmly in a solution of lukewarm water containing a few drops of mild
household cleaner, for example a dish washing detergent. The cooling fins on the
rear may be cleaned using a soft brush or a vacuum cleaner. The front cloth may
be cleaned with a vacuum cleaner set to the lowest level.
Note: Never use alcohol or other solvents to clean any part of the BeoLab 4000 MKII !
Insulation test
The product 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.
Flashover must not occur during the test.
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.
Connect the other terminal to ground on the Power Link socket.
NOTE!
To avoid damaging the product it is essential that both terminals of the insulation
tester have good contact.
During the test the current must not exceed 10 mA.
Slowly increase the voltage on the insulation tester until a voltage of 2.5 kV (ac) is
obtained. Maintain the voltage level for one second, then slowly decrease the
voltage to 0 V (ac).
3.1
Adjustments
Adjustments
Adjustments after replacing PCB03, Main PCB
Read out the adjustment position of the old potentiometers, R301 & R312, and
set the new potentiometers to the same position.
Adjustments of bass/treble levels
Each loudspeaker is individually adjusted from production to ensure optimal stereo
perspective. When replacing a speaker unit or PCB03, Main PCB, bass/treble levels
have to be adjusted. On the back of the new speaker unit will be printed a rated
value for the sensitivity of the particular unit. The rated value is stated in dB and
have to be converted to a mechanical position of the two potentiometers by using
table 1 and fig.1.
After replacing a speaker unit
- Adjust treble level by means of (R301) and the bass level by means of (R312).
These two potentiometer are accessible via the two holes in the socket well, see
fig. 1.
- Adjusts according to the drawing and table 1. Only the potentiometer of the
replaced unit have to be adjusted.
WARNING: Do under no circumstances adjust the level of a unit that has not been
replaced!
Table 1
Fig.1
‘‘Clock position’’
(The new position
of the
potentiometer)
Bass deviation ±dB
Treble deviation ±dB
0830
+3.1
+3.9
0900
+2.7
+3.3
1000
+1.8
+2.2
1100
+0.9
+1.1
1200
0.0
0.0
0100
-0.9
-1.1
0200
-1.8
-2.2
0300
-2.7
-3.3
0330
-3.1
-3.9
11 12 1
10
2
9
3
W
T
LINE
L
R
POWER
1
2
LINK
Repair tips
4.1
Repair tips
Hum in loudspeaker when no music is played
The Power Link cable must be of type MK III or higher.
The ground connection in Power Link cable lower than MK III may be insufficient
for optimum sound performance.
PowerLink
MKIII
Check loudspeaker units
The loudspeaker units can be checked by an ohm-meter.
OK values for tweeter and woofer are approx. 6 W.
How to check the Switch Mode Power Supply
- Take off the baffle.
- Connect an audio signal (set the input switch corresponding to the applied signal).
- Connect mains, 100 - 240V.
- Confirm 12V standby on PCB02, SMPS P2 pin 6, GND pin 3 (if not OK, replace
PCB02, SMPS).
- Confirm 12V HT_ON, on PCB02, SMPS P2 pin 8 (if not OK replace PCB03, Main
PCB).
- Confirm ±12V on PCB02, SMPS P2 +12V pin 1, 2 and -12V pin 4, 5 (GND pin 3).
If not OK replace PCB02, SMPS.
4.2
Replacement of modules
Replacement of modules
Modules that can be replaced
BeoLab 4000 MKII in service position ..........................
Replace PCB01, Amplifier ...........................................
Replace PCB02, SMPS . ...............................................
Replace PCB03, Main PCB ..........................................
Replace PCB04, LED ...................................................
5.2
5.4
5.5
5.6
5.7
Warning – Static electricity
Static electricity may damage the product.
A static-protective field service kit must always be used when the product is
disassembled or modules are being handled.
ESD
Notice!
All modules must be placed on the ESD-mat or in an ESD-proof bag.
ESD-Mat
Purpose of replacement of modules
Short instructions for replacement of the available modules, with reference to
additional illustrations:
- The correct sequence for replacing modules.
- Text and illustrations.
- Reference to adjustment.
Adjustments
After replacing PCB03, Main or a loudspeaker an adjustment is required, see
adjustments.
5.
5.
BeoLab 4000 MKII in service position
- Remove cables connected to BeoLab 4000 MKII
LINE
L
R
POWER
1
2
LINK
- Remove front frame
- Remove profile
2x
TX10
- Remove screws for baffle
10x
TX10
BeoLab 4000 MKII in service position
- Remove cables for speaker units
5.
5.
Replace PCB01, Amplifier
+ 5.2 BeoLab 4000 MKII in service position
- Remove screws
4x
TX10
- Remove cables on backside of PCB
4P300
4P301
Replace PCB02, SMPS
+ 5.2 BeoLab 4000 MKII in service position
2P1
- Remove cables
2P2
- Remove screws and pull out PCB02, SMPS
6x
TX10
5.
5.
Replace PCB03, Main PCB
+ 5.2 BeoLab 4000 MKII in service position
- Remove screws and pull out PCB03, Main PCB
- Remove ground cable!
5x
TX10
Ground
- Remove cables
3P300
3P103
3P100
Replace PCB04, LED
+ 5.2 BeoLab 4000 MKII in service position
- Remove screw and pull out LED
1x
TX10
- Remove screws and pull PCB04, LED out
2x
TX10
- Remove screw and pull off light guide
1x
TX10
5.
5.
Specification guidelines for service use
6.1
Specification guidelines for service use
Type
Power supply:
Voltage
Power consumption
Cabinet finish
Front cloth
BeoLab 4000 MKII
6642 (EU), 6643 (GB), 6644 (US), 6645 (J), 6646 (AUS), 6647 (KOR)
6648 (CN)
Dimensions W x H x D
Weight
Indicator
Operation
Protection
System data:
Effective Frequency range
Sound Pressure Level (SPL)
Input impedance
Harmonic distortion
Electronics:
Active crossover network
High pass filter
Low frequency equalization
Bass equalization
28 x 32 x 16 cm (with wall bracket)
4.5 kg
LED for On (green) or Off (red)
Left, Right or LINE, switch
Thermal protection of SMPS
Tweeter protection
Acoustics and cabinet:
Cabinet principle
Woofer
Tweeter
Magnetically shielded
Crossover frequency
Net volume, bass
Power amplifier:
Signal to noise ratio
Input sensitivity/impedance:
Input sensitivity Power Link & Line
Power link sockets
Power link channel separation Standby function Switch off time (line)
Power amplifier, bass
Power amplifier, treble
Long-term maximum output power 100-240 Volt
Typical: 6 W, Standby: 0.5 W
Grey, black, dark grey, yellow, red/black, blue/black
Grey, black, dark grey, yellow, red, blue
55–20,000 Hz
97 dB/IEC noise 3 m/stereo/room
47kW
<6% 90 dB SPL/1 m/250-1000 Hz
<2% 90 dB SPL/1 m/1000-5000 Hz
Linkwitz/Riley
30 dB/octave, 51 Hz
51 Hz/+10 dB
ABL (Adaptive Bass Linearization)
Bass reflex
114 mm (4½”), 8W
18 mm (¾”), 8W
Yes
3.3 kHz
4 litres
>= 84 dBA (1W in Woofer)
125 mV (88 dB SPL) Auto switch on
1V/47 kW
>55 dB/10,000 Hz
Automatic On-Standby
3 min.
30 W, Class D, ICE power®
30 W, Class D, ICE power®
56 W
Connections:
Power Link 2 x 8-pin socket
Pin 1 Power up/down not used
(interconnected between the two Power Link plugs )
Pin 2 Signal GND
Pin 3 Left in (also used for line in. Note: pin2&7 in the plug must be connected when used for line in)
Pin 4 Loudspeaker on/sense => 2.5V, OFF =< 0.5V
Pin 5 Right in
Pin 6 Data (Not used)
(interconnected between the two Power Link plugs )
Pin 7 Data GND
Pin 8 (Not used)
(Jacket:
No connect)
Subject to change without notice
6.2
Block diagram – Wiring diagram
Block diagram
7.
7.
Block diagram – Wiring diagram
7.
PCB04, LED
PCB01,
Amplifier
Autostart
R302
1
EQ
notch
4 kHz
2
H. P. F
fc
3200 Hz
EQ
notch
7 kHz
Tweeter
Protection
Limiter
H. P. F
fc
3200 Hz
Tweeter
Differential
Output
Tweeter gain adjust
HT On
Tweeter
amp.
gain
20dB
ICE power
Gain 12dB
Woofer
Gain adjust
MUTUAL EQ
1
Input amp.
2
750Hz
notch
R312
1.35kHz
notch
2.4kHz
peak
ABL
L. P. F
L. P. F
fc
3560Hz
fc
3560Hz
Woofer
amp.
gain
20dB
Differential
Output
Filter PWB
Input
select
+12V stby.
AC in
PCB02,
SMPS
Woofer
PCB03, Main
+/-12V
DIN input
HT on
Wiring diagram
Tweeter level
Woofer level
Line R/L
Plug
Plug
2/3pins
Neutral
>
>
P1
Plug
8/8pins
8/8pins
P2
W01
>
>
>
Tweeter
Plug
Purple
P300
Plug
01
>
<
>
>
AMPLIFIER
>
>
W02
>
>
>
>
>
>
>
>
<
<
White
4/5pins
P301
>
>
>
>
Power Link 2
SMPS
Live
>
>
>
W03
>
<
>
>
02
AC Inlet
8/8pins
8/8pins
P300
Power Link 1
W05
Woofer
03
Red
MAIN PCB
Black
Plug
P100
04
Plug
3/3pins
3/3pins
P103
>
>
W04
>
>
Plug
LED
P104
G
R
GND
8.1
Available parts
8.1
8.1
Available parts
Available parts
Baffle – left
9001
Baffle – right
9015
9014
!
1
1
1
!
2
1
9002
Incl. pos. nos. 9004, 9005
9003
10
9104
10
9003
11
Baffle
3
9101
9016
10
2
11
10
10
10
9102
9017
10
10
11
9004
10
9018
10
9102
4
9005
10
9006
9103
4
3
4
7
2
4
1
6
9001
9
4
9
9
9020
10
9021
6
4
4
9009
6
6
6
6
1
4
8
10
6
4
1
6
6
6
4
6
6 6
4
8
1
10
1
9007
2
9019
10
9020
5
Incl. pos. nos.
9004, 9005
9008
10
4
4
3
12
9
9010
9011
9012
9013
Available parts 8.2
BeoLab 4000 MKII
9001
9002
9003
9004
9005
9006
9007
9008
9009
9010
9011
9012
9013
9014
9015
9016
9017
9018
9019
9020
9021
3451181
3451227
3451242
3456201
3456202
3456205
3358346
3947350
3340136
3340090
3169054
3170226
3152399
3151432
2576128
6150039
3340134
2938320
3440162
3440163
8480321
8480384
3320300
3320742
3320750
3320885
2568090
2568111
2568148
2568150
2568158
2816315
3332015
Top/bottom, red
Top/bottom, blue
Top/bottom, dark grey
Top/bottom, aluminium
Top/bottom, black
Top/bottom, yellow
Heat sink incl. pos. nos. 9004, 9005
Foam tape, 10m
Gasket
Gasket
Bracket incl. pos. nos. 9004, 9005
Shield
Holder f/PCB2
Holder f/PCB1
Adapter
Light guide
Gasket f/light guide
Bush f/light guide
Baffle, left
Baffle, right
Tweeter
Woofer
Front frame, black
Front frame, grey
Front frame, yellow
Front frame, dark grey
Set of profiles, black
Set of profiles, yellow
Set of profiles, red
Set of profiles, blue
Set of profiles, dark grey
Spring
Set of gaskets
01Module 8003563
PCB01, Amplifier
02Module 8003556
PCB02, SMPS
03Module 8003562
PCB03, Main PCB
04Module 8003555
PCB04, LED
9101
9102
9103
9104
3031601
3031620
2816297
3031651
Bracket f/wall
Bracket f/speaker
Clips
Wall bracket, complete
Screws etc.
1
2
3
4
5
6
7
8
9
10
11
12
2013177
2816298
2042053
2013229
7530087
2013137
7530119
2015182
2015132
2015139
2054046
3340137
Screw 3 x 13mm
Spring
Screw 4 x 16mm
Screw 3 x 6mm
Solder tab
Screw 3 x 10mm
Solder tab
Screw 3 x 13mm
Screw 3.5 x 10mm
Screw 3.5 x 16mm
Screw 3.5 x 12mm
Gasket
Wires
The W number refers to the Wiring diagram page 7.1
W01
W02
W03
W04
W05
6278171
6278172
6278173
6278174
6278175
Wire, Inlet
Wire, SMPS
Wire, Amplifier
Wire, LED
Wire, speaker
8.3 Available parts
Mains cables
6100273
6100329
6100307
6100331
6100332
6100386
6100047
Mains cable, EU, 3m
Mains cable, UK, 3m
Mains cable, US, 3m
Mains cable, JP, 3m
Mains cable, AUS, 3m
Mains cable, KOR, 3m
Mains cable, China, 3m
Packing
3397996
3392504
Set of foam
Outer carton
Parts not shown
3658262
3103325
3040030
6270041
Product cover
Rubber foot
Allen key
Power Link cable MKIII, 5m, black
Accessories
1203726
Base
6270856
6270433
Phono male to PL line-in, black, 5 m
Stereo mini-jack (male) to 2 x phono-female, black, 3m
See Retail Ordering System
Available documentation
Available parts 8.4
Floor Speaker Stand – type 2069
9201
9202
9203
9204
9205
Incl. pos. no. 9210
9210
9211
9201
9202
9203
9204
9205
9210
9211
3031707
2072119
2950216
3459257
2752081
3103392
3103390
Fitting
Fixing screw
Aluminium tube
Cover plate
Foot incl. pos. no. 9210
Foot “soft”
Foot “spike”
3390616
3504637
3392710
3396136
Bag w/parts (2 screws 4x12mm, 6 pcs. of pos. no. 9211 and 1 torx key
Setting-up guide
Outer carton
Foam packing top/bottom
8.5
Bang & Olufsen
DK-7600 Struer
Denmark
Phone +45 96 84 11 22*
Fax +45 97 85 39 11
3538061
03-07