Bang&Olufsen rt.

BeoSoundCentury
Typ€ 2651, 2652, 2654, 265/l

SERVICE
MANUAL

CircuitDescription
3540178Danish
3540179English
3540180German
3540181Fi€nch
 Bang&Olufsen

CONTENTS
Surveyof modules 1-1
Specification
Guidelines
for service
use............... 1-2
Wiringof transformer.......,......... .. 1-3
Briefoperationguide 1-5

Diagrams etc. 2
Explanation
of diagram 2-1
Wiringdiagram 2-2
Blockdiagrams.................. 2-3-2-8
Diagrams 2-9-2-24

List of electrical parts ..........

List of mechanical parts

Adjustments and repair tips

GB D F
Adjusffnents.................. 5-1 5-10 5-22
Tuner.......... 5-1 5-10 5-22
Tape............ 5-1 5-10 5-22
cD............... 5-3 5-13 5-25
Loudspeaker 5-4 5-14 5-25
Replacement of PCB2 Amplifier 5-4 5-14 5-25
Replacement of PCB3 or 31C4 5-5 5-15 5-27
Replacement of a speaker unit.............. 5-5 5-15 5-27

Repairtips ............. 5-6 5-17 5-29

Lubrication 5-5 5-17 5-29
Replacement of CDdrivemechanism 5-5 5-17 5-29
TapeWow frequencies 5-6 5-17 5-29
Testfunctions ................... 5-5 5-17 5-29
Testmode... 5-7 5-18 5-30
Displayof tuner variant 5-7 5-18 5-30
Gearbox test...........,.. 5-7 5-18 5-30
Keyboard test.............. 5-7 s-18 5-30
LEDtest 5-7 5-18 5-30
Displayof softwareversion 5-7 5-18 5-30
Presetting of EEPROM 5-8 5-19 5-31
Continuousoperationof tape recorder 5-8 5-19 s-31
Speakersoundleveladjustment 5-8 5-19 5-31
5-8 5-19 5-31
[ffi;;;; ;;;;;il;il::::::::
:::::::
:::::::::::::::::::::::
:::::r
:::::::::::::::: 5-9 5-20 5-32

Disassembly

Glass door... ...................;. 5-1

F r o nfta b r i ct , " r " . . . . . . . . . . : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : . : : : : : : . : : : . : : : : : : : 6: :-:l: : : : . . . . . . . . . . .
Handle/PCB 21 Activeantenna 5-1
Rearpanel 6-2
CDfront frame/PCB 20 Doorsensor 5-3
Tape/Keyboard front frame.......... .. 5-4
Gearbox/PCB 9 Gearsensor 54
Sfidingbracketfor glassdoor............ 6-4
Transformer 64
PCB1 - PCB22 .........6-5- 6-7
Tapemechanism .............. 5-8

Insulation test

-
s
I
Bang
&Olufsen 1-1
SURVEY
OF MODULES

I FM/AM decoder ..... diagr. A

page 2-10
3 Microcomputer...........
;$:rr1;;
Amplifier Sound processing .......diagr. I 4 oisptay& Keyboard
page 2-19 ;"rJ:rrl;l
Output Amplifier, left .............. .. diagr. J 5 Power Supply & Motor Control diagr, M
page 2-20 page 2-23

Output Amplifier, right ............ . diagr. K 6 rRReceiver...................

page 2-21 ;.T:rr1;l
2 Door sensor transmit.... diagr. L 7 rapedieital
page 2-22 ;#:rr:;?
2 Amplifier power supply diagr. M 7 tapeanalos
page 2-23 ;#?:;;
7 Reset
converter
;$:T-r?

.f

Seenfrom the front

r
 1-1 1-1
OF MODULES
SURVEY

8 cD servo diagr. E 2O ooor Sensor receive......... ..,...,,.,diagr, L

page 2-15 page 2-22

8 C D D e c o d e r. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .d. .i a g r . F 21 active FM Antenna diagr. I

page 2-16 page 2-19

9 Gear-sensor ................... diagr. G 22 Crossover network, left ...,,.,,.,,.,, diagr. J

page 2-17 page 2-20

1oMains 22 Crossover network, right ......,..... diagr. K

;:i'1tl-ii page 2-21

11 Re_deck
electronic
;$:T1?
1 2 O s c i l l a t o r. . . . . . . . . . . . . . . . . . . diagr. D
page 2-14

17 FM Front end . diagr. A

page 2-10

8
1/17

Seenfrom the back

Z
1-2 1-2
SPECIFICATION
GUIDELINES

SPECIFICATION
GUIDELINESFORSERVICEUSE
BeoSound Century
rV ranfe Type2651 EU
FM-MW-LWrange Type 2652cB, 2653 USA/CAN,2654 JAp
Operation Direct,easy-touchpushbuttons
Optionalextra Beolink1000,one-way
Cabinetfinish Black
Front cover Grey-Red-Blue-Green,
type 6037

Acoustic system:
Active speakers 2x2outputamplifier
O u t p u ta m p l i f i e r ClassG
SoundPressure
Level 95 dB IECnoise/3m/stereo/room
Frequencyresponse 75 - 20,000Hz +4 -8 dB
C a b i n e tp r i n c i p l e BassReflex
Croosoverfrequency 3 5 0 0H z
Active crossovernetwork 24 dB/octaveLinkwitz/Ri
ley
Woofer 10cm-4"
Tweeter 1.8cm - 3/q"
Net volume 1.'l litres

Tuner:
PretuneJradio programs 30 FM or AM
FM section:
't08.0
FMrange 8 7 . 5- MHzEU/GB
7 6 . 0- 9 0 . 0M H z J A P
F M a e r i a li m p e d a n c e 75O
Sensitivity < 1,4;rV26 dB S/Nmono
Qulgting sensitivity < 45prV 50 dB S/Nstereo
Signal-to-noise
ratio > 66 dB mono
> 63 dB stereo
Totai HarmonicDistortion < 0,8%o
mono
< 1,0%o
stereo
Freqencyresponse 40 - I 5,000Hz +1.5dB
C h a n n esl e p a r a t i o n > 33dB lkHz
lmage rejection > 75 dB
lF rejection > 80 dB
AM section:
AM range L W 1 5 0- 2 7 9 k H z G B
M W 5 2 2- 1 6 1 0k H zG B
MW s20 tttOiiz USA/CAN
Antenna L o o p1 8 . 1 p r H
Sensitivity < 4mV/m 26dBS/N156kHz
< 1.8mv/m26 dB S/N558kHz
Signal-to-noise
ratio > 47dB 50mV/r gOitHt
Total HarmonicDistortion < 3% 50mV/mnoise96ikHz
Selectivity59 > 42 dB 1494kHz
lmage rejection > 40 dB 270kHz
> 30 dB 1494KHz
lF rejection > 65 dB 270kHz
> 5 0d B 5 5 8 k H z

Tape recorder:
Compactcasette c46 - C120
-2 1-2 Bang
INES SPECIFICATION
GUIDELINES
&Olufsen

fape transport Auto reverse

Taperecordingsystem HX PRO
Record level Auto RecordLevel
Noisereduction NR
r a p es w t t c n Auto ferro/chrome
fape fread oynattoyiHarOpermalloy)
Wow and flutter < 0 . 1 5 %D t N
Speeddeviation < +2o/o
Fastforward < 120sec.C60
Frequencyrange 50 - 14,000Hz +3 dB chrome
sig;at to-noiseratio > 53 dB ferro
t 62 ;B ferro with noisereduction
> 56 dB chrome
> 64 dB chromewith noisereduction
Distortion < 3ohD31315Hz
Channelseparation >35dB1kHz
C h a n n eul n b a l a n c e <2dB
Erasure >70dB
Erasurefreqency 80 kHz

CD player:
Drsctype: 1 2 c m ( 5 " )a n d 8 c m ( 3 " )
Convertersystem Bitstream
Frequencyrange 20 - 20,000kHz +0.5 dB/ 2 dB
Signal-to-noise
ratio > 94 dB A-weighted
Harmonicdistortion < O.025o/o
at 0 dB/1 kHz

Connections:
n u O i oA u x Pin t l.t.C.
P i n2 S i g n agl r o u n d
Pin 3 AF in left 0.25-2VRM547kO
P i n4 N . C .
Pin 5 AF in right O.25-2VRMS47kO
P i n6 N . C .
P i n7 N . C .

Powersupply 2 3 0 VA C 2 6 5 1E U
240V AC 2652 GB
12OVAC 2653USA/CAN
toovnc 2654 JAP
Power consumption Max. 50 watts
t wati in stand-by
fotaiOimensionrW"|{*O 75x37 x17 cm
7 5 x 3 3 . 5x 1 1 c m o n w a l l b r a c k e t
Weight 1 2k g

Optional accessories:
Beolink'1000 T y p e1 5 0 1 ,1 5 0 2l t a l y
Carryinghandle/activeFM antenna Type2036
nfV loop antenna 8720043
Wall bracket Type 2OaS

Subj-ct to change without notice

--
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WIRINGOFTRANSFORMER

Type 2551
EU230V-
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PCB10, Mains

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1-3 1-3
WIRINGOFTRANSFORMER

Type 2552
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WIRINGOFTRANSFORMER

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Bang&Olufsen 1-5 1-
BRIEF
OPERATION
GUIDE BRIE

BRIEFOPERATIONGUIDE
BeoSoundCenturyis primarilydesignedfor closeupoperation.Only the COMPACT DISC:
relevantbuttons light up. UseBeolink'l000for remote control (seeUser's R a i s et h e C D - c l a m p
guide).
.,{,1-''il'l'0
' Lowerthe CD-clamp
RADIO: $ltu DrspLAy:
Turnon the radio
\'//' p Start playingthe CD
\ (Display= track no.)
C h a n g ed i s p l a yi n d i c a t i o n \N F EE.E
(display= frequency) Browsethrough tracks
Z"nffiflNe
Tuneinto and storeall FM 2sec. EE.E Selecttrack number (ex.5)
radiostationsin the area

Searches up/down the EE.E Pausethe CD player

frequencies for an accep-
t a b l es i g n a l
Resumeplayingafter stop,
Keyin frequency
(ex.87.5MHz)
E 1.5 o r c h a n g ed i s p l a yi n d i c a t i o n
(display= track time)
C h a n g ed i s p l a yi n d i c a t i o n
Storethe stationon a vacant
programnumber (0-30)
P ] D ( d i s p l a y= r e m a i n i n gt i m e )

Randomplay status
Storethe stationto a pro-
gram number (0-30)
P E ( d i s p l a yi n d i c a t i o ni s
blinking)
Randomplay on/off
Erasethe stationfrom pro-
g r a mn o .
P (displayindicationrotates
w h e n r a n d o mp l a y i s o n )
Switchingbetween FM/AM
(not all types)
EE.E Selectanother source

Browsethrough program
numbers
1 Switchto stand-by

Keyin exactprogram number

]D AUXITLARY SOURCE:
O p e n a u x i l a yi n p u t
Selectanother source (startnow auxilarysource)

Switchto stand-by
Switchto stand-by

SOUND ADJUSTMENTS:
ACTIVEANTENNA
Raises/lovers
the levels
OPTION:

Volume level
Selectactiveantennaoption

Storeall sound levels

Cut out activeantenna option D
Loudspeakerbalance
REMOTECONTROL:
(No light in buttons) Basslevel

Disablethe remote control function

Treblelevel

Regainthe remote control function D Loudness

t-5 1-5
GUIDE BRIEF
OPERATION
GUIDE

DISPLAY: TAPE RECORDER: DISPLAY:

Start playingthe tape Dnn
Playthe other side (turn)
@r,"..
-nnn
P l a yf r o m t h e b e g i n n i n g NDD
I Browsethrough tracks
I

I
f
I
Pausethe tape recorder nPl
tl Fastforwards/rewinds
the tape
DEE
t.\1 Erasetape (no source) DEE
I El E Resumeplayingafter stop DJl

tl
Noisereductionstatus nr-

Noisereductionon/off NT
ll ( d i s p l a yi n d i c a t i o nb l i n k s
when noisereductionis off)

Selectanother source

Recordingpausemode rEt
(displayblinksalternately)
--l
Auto reversestatus

--l
.,9 NU Auto reverseonlofl

c
( d i s p l a yi n d i c a t i o nb l i n k s
when auto reverseis off)
a Start recordingtrack 4 (ex.) \
on CD (only if CD is selected
as source)

Stop recordingpausemode
1n
Start recording rPr
1D
Pausethe recording
EE
Stop recordingcompletely

Returnto approx.recor-
D ding start
Resumerecordingafter
pause
rPr
D
Selectanother source

Lnud Switch to stand-by

Bang
&Olufsen 2-2 2-2
WIRINGDIAGRAM WIRIN

WIRINGDIAGRAM

A-/ G E A R
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CL A N1PFR,/
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IAGRAM WIRINGDIAGRAM

A N I[ N \ A

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BLOCKDIAGRAM BLOC

BLOCKDIAGRAM FOR POWERSUPPLY

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BLOCKDIAGRAM BLO

BLOCKDIAGRAM FOR SYSTEMCONTROL

SYS. ON/OFF
T A P Eo S C . & 5 / 8 . 4 1
M O T O RO N / O F F
D O O RC L O S E
CLAMPER ON,/OFF
OPEN,/C L OSt
RAq< OPTO RESET TAPE ON/OFF
TRFBI F SDA r
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l'41CROCOI'.1PUTER
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STROBE

KEYBOARD
DATA
DISPLA&
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STROBE KEYBOARD
FM,/AM 26x f,
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DECODER 4 x B
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RAM BLOCKDIAGRAM

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[-JJ TAPE oSC . 8. 5 /8 . 47
MOTORON/OJ:-
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2ND-
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LOOP FILTER
FM TUN
VOLTAGE

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2-5 2-5 2-
BLOCKDIAGRAM BLO

BLOCKDIAGRAM FORTAPE ANALOG

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DECK B
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iang&0lufsen 2-6 2-6
BLOCKDIAGRAM BLOCKDIAGR

LOCKDIAGRAM FORTAPE DIGITAL

I]OWER DO14N

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 2-6 2-6 2-6
IAGRAM BLOCKDIAGRAM

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2-7 2-7 2"'
BLOCKDIAGRAM BLOC

BLOCKDIAGRAM FOR CD

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 2-7 2-7 Bang&Olufse
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BLOCKDIAGRAM BL

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DIAGRAMA D

) onGRAM A FM/AMDE.'DER

TUNERUNIT
M O D U 1L E

FM- FRONTEND

Fx l0Slllz 7-9v
Ftl 87.9ttlz 1.3-2v
Fil 9Oltlz 7-9v JAPAN
FM 781+lzl,3-2.2v JAPAN
Iff lSllkHz 8.5Y +-0,1v EURoPE
t{t 522kHz l. lv +-0.3v EUROPE
LW 279kHz 8.5v +-0.lv Etn0PE
LU lS3KllZ lV +-0.1V EUROPE
tt l7lfiHz 8 , 5 v + - 0 .l Y USA
tfl 530kHz lY +-0.3v USA
lfl 522KHz l' IY +-0.3v JAPAN
lfl l829kHz 8v +-0.3v JAPAN

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 2-10 2-10
DIAGRAMA

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i 2116 8 1 8 3239 0t3
1 2ll7 D20 3210 nt
r 2 l l 8 F 2 0 3 2 1 1l t t
iB z l l s o 2 l 3212 Ctz
1 2120F2l 3213 n1
| 2l2l E7 3 2 1 18 1 9
| 2t23 cA 3215 J22
l' 2t21et1 5 l 0 t F 5
| 212509 s t 0 2 0 1
| 2t26010 5 t 0 3 0 s
| 2126ilo 5 1 0 48 t 2
Ic 2129or3 5 1 0 58 t 5
To DTAGRAM
r,/M | 2t3l 016 5 1 0 60 1 2
pcBz. pLUczo
5 1 0 7J 3
Jsr
1117
i ;lil l? 5t08 t?
l. 2r1z 16 5t0g t{3
| 2143 t{3 5llt 0t1
LEFT I Zt11 K1 5n2 Lt2
lP28-l I ZtlS Js 5l1308
ID 2 1 1 5L 6 5u1 16
| 2 1 1 ?J l 5 5!28Bl0
| 2 r 1 BJ t 5 5 1 2 9J t 0
| 2 1 4 9J t 5 5l0l il3
r. 2 1 5 0J l G 6102 r(1
| 2tst rtz 6109 F22
6 1 2 1t l l 8
6t23il7
?tot 04
7102 c1
?r03 E9
7 1 0 18 t 6
? t 0 5n 3
7106 J22
1107 L22
7 1 0 8l { t 1
? t 0 90 r 1
7il0 L2
?il t t{2
7il2 n5
7l13iltz
7tt1 n2
?u5 I1
7il6 C7
7t20 022
9 1 6 0J 7

sT0Pstc | .. 3103 83
n 3lol c3
I
r 3 1 0 5E 2
MU|L gtoo os
i
| 310?01
srEREo t' 3108Es
| 3 1 0 9c 1
^E | 3ll0 0{
| 3lll 05
|| 3ll2 c5
corJt{IER | 3tt3 R5
| 3ll1 c7
D^T I 3ll33;
| 3u7 C?
ctocr( | 3lt8 8?
| 3 t 2 0R t 3
| .l 3tzl Bil
I gtzz Blt
I 3 1 2 3B t ?
| 3 1 2 18 1 8
r. 3 1 2 58 2 0
| 3 1 2 68 2 0
| 3 1 2 ?0 2 0
| 3 1 2 8F 2 0
ir 3 1 2 90 1 6
| 3l3l 019
i 3 1 3 20 1 3
| 3 1 3 3o l o
l. 3 1 3 3r r 0
I 3 t 3 10 1 3
i 3l3s F8
i 3 1 1 0L 2
i ,- 3l1t t12
i 3t1z )tz
i 3 1 1 3J 4
i 3 1 1 1J s
i. 3t1s r5
i 3u6 H6
i 3 1 1 7r ( s
i 3 1 1 8r s

ii r :l;3 ti,
3tst 0t2
| 3 1 5 20 1 2
I 3 1 5 3L 3
i' 3ls1 L1
I 3lss nlS
1 3 1 5 6I l 5
| 3 1 5 ?0 1 1
J FOf, AM i tl 3158 iltl
| 3lsg Nt7
J FORFM
| 3 1 6 0i l 1 8
.Y FoR tS | 3 1 6 2J t 3
l' 3t63 122
I toRus^ | 3 1 6 1J l o
| 3 1 6 5J l ?
| 3 1 6 6J l 8
| 3t67Jt7
|0 3t?0 t2l
| 3t?r Lzt
| 3t12 K22
| 3l?3 X23
| 3 1 8 60 2 1
' 2 8 2 1 e -6 - - - +
2-11 2-11 2-11

DIAGRAM sEEpAGE2-13)
B rApE DrGrrAL(pcB DRAWTNG

RECORDER/DIGITAL
PART
MODULE
7

A PVCC
3645
RE-DEC(DELECTROIII
C
IODULEI I

t-----t
I N T E R C 0 N i l E C |T I 0 N. ^ - ^
B0nB!_ PR(}TECTD I ( I) (N) t ) E
| i9 F o R7 6 3 9

?529
8C807-

CRPSTRN
f10T0R
l1 2-11 2-11
DIAGRAMB

)Jl

807-40
il z.zv
v l
lEl3641
tNl

tl CLOCKINPU]

_ l O S - S E R I 8O
L UI
8 S I S G ES H I F I
R E OSI TER

8 8ITSHIFT
R E GSIT E R

OE

FROIl ? 7 0 9
P I N 40

+5V

3 6 6I

3813
2-11 2-11 Bang&Olufsen
IAGRAMB DIAGRAMB

IOJf, E 7
I 655 829
I 656 E 2
1661 El4
"^
2't5'l Dlt
2't68 K23
3 6 04 F23
3605 D21
360? F23
360S F22
JOZ) 023
3529 Gr6
B:o:t E 8
TO I}IRGRRII6
P C 8 3P L U O
5 3635 F 8
l 655 3 63 7 G 8
3639 010
3 6 4I F 9
3 6 43 cl0
3645 010
364? F lI
c a648 828
3649 c23
3 6 5r ct2
3 6 55 t1l5
3657 013
e
e) 3 6 6I nt2
o_ 3 6 64 123
3565 nr6
-
o_
D 366?
3668
El5
F17
-. 3669
3670
Rl7
R18
3 6 ?l B1?
36't2 818
; 36?4
36?5
c28
c28
E 36?7 Hl6
- 3679 E1l
3?50 H23
E. 3805
O 3807
o_ 3813
3 8 17
:= 3820
L F 3900
3 9 01
+5V
-
O
RECNUTE
3907
6 6 3l
?625
't621
CO 7629
7 6 3I
E
O
:=
o_
^ ?633
/OJf,

o_ ? 63 ?
NR8 7 63 9
C)
? 6 41
ca 7643
7 6 45
PflIJSE
164'7
; ?653
H lloa
u = ??09
P80-8

__l

(Y
O
["'*t, o_
; n00uLE
t2
DrscRnn
0 a

il

+5v
5V <_

PVCC
1 0 . 6 V< _
ts.8-l1v)
I]C VOLTROTS
A T E R S U RI E
ND
P L B Y E RnCo( D E -_ ^-._ P0l{N
t u J b 4 9< _
+ 3.6V
O r.v.u
I :vilil^'<-.------<
ut I b:b
Bang&0lufsen 2-12 2-1
DIAGRAMC DIAGR

DIAGRAM sEEpAGE2-13)
C rApE ANALoG (pcB DRAWTNG
1 , ? , 3 , 4 5 6

RECORDER/ANALOG
PART
3171 12661
N O D U L7E lttno
T""
I
VR lvR

TAPED[CI(
-TODUL[
- _ - -911
I659

AA#o'uo*n'
\
It'.,v
*rr-,T-l -
C1

I 12 OSCILLSTOR

J T ' 0 5 C .C O N T R O L
I
I
c2
I650
I
l g
t =
t -

t H

_ t E

l z n r q^ j 2 6 1 1
r-;;.-,
r R , n v + z z N 9 <r l h - - r F t 4V I
ii ii- lrr r.ill looN [n s.ovlra

=:E=-
tl
764s V ll
PB ov _BcB17- ao___lr Llv
R E C13 . 8 V

i'noJ
?655
ToVnn BC848B

P8 IN O LIFT

P8 IN R R:GHT

P BI N 8 R , O H T

--1"
P8 I FEC

l;:
tzo

IF T.
lp I
 2-12 2-12
DIAGRAMC

IN/OUT vcc
2 r*
OUT/IN CONIROL
R '1720 lvcc I
3
VR

136l 9
OUT/IN
I N/OU]
4
CONTROL
I)
Illl0uT
1121
HEF?O69U8T l
| ,.{t-
-
'1
. CONTROL8
5
OUT/IN
lLf,___J-
r\
6
CONTROLC O U TI N
/
1
VSS IN/OUT

o | -.- | _ | | /'REct

I r---------------r NS/HS
P8 IN 8 LEFT
PB T"EYIL
B DEC|(L
'l 4MU7 | 100P I
12669 12?65 1268s
163r
t100P trNs iiN
I uo I lu*o
lQl3srs
l=l
T
I
l vRD RICAMPUIIIR
LIIT
NJf134
15I]
?70s

2i09
100P
22N

3 ?1 5
t[/cR
EQUAUZATIOTI
2103 uu7
70P
SPE[D
EqUAUZAIIOII 3125
3905
OSCCONTROL

nUTE:
I
RIC I^EVEL
R
7705
2138 NJM3415D

4MU1 ?'ll0
L :100P
HS-REC:VCC
^ RECI / :2 V C C
[J P8:0

c
I

I rr=vcc VCC
CR02=0
l7

0 E C K8 = V C C
0 E C Kf l = 0

70P 5628

2!18 PBI..EYEL
ll?;^,^,,
.3v 3688
. B DECI(
R
2146 3740

Tff'
L
T1N5
2612 vR I
T^
l vRD
.31_____--f-< *trau
330N
lYl
2614 36so vR T
,/|;;-1@< .E31N1 83
I
vR0
vR0 I vR0

PVCC 1721
1720
IE 3 1 2 1 HEFTO69UBT
ld
HEFTO69UBT'"

P 8 R6 \ l s _ 4 \ 1 3
 2-12 2-12

rd % % -3---J--j--i-
q @l\il lu" t</__l
l| n,,n,o,,
- NJn4s6o
I H E F ? o o s u BI T

sr'J ^,^l
J
oJut llq--_l ""1
LL__J___J__S!I
TO DIRCREN
P C 8 2P L U O
I/N
2I
I660
J D I 2 3
5633 nP21-1

3?15 741 r??t-2

]N3

VRt] vR0 r02 IP2l-3

26l 9
-{
68 TO t?21-4
2145
1
I 2?59 2135
MU47 IP2l-5
IMU
3?65
IP2l-6
vR0
VRD
3606
n?21-1

733 2 l 1 3r . o v
?620
f1P21-8
4

J /OO IP2l-9

2624 - l0
11P2l
2136

0l
-{F
lMU i
80P
2623
SPIED
EQUAUZAIIO}I
iR 3905
T100N
l.
P O H EI R \
ol,tN ,/
PVCC
-=\
;- rno I
l77l I I
I
,l"F=,1 iUTT
VCC zl I

I,
3712 30N I

UIIIRRICI|T cuE/REv-
VCC
l,t . ?v
7705 r NR-B
r . vl

NR_REC

l11. SPEED
aiop IQUAUZATI0I{

3901

REC=101,{

PB_NUTE

R E CI l U I I
#F------
"." 680N +

PEINR^p6 0N

I .t.t2t
Y PVCC 1721
8372? iri?roosusr
I - S I O N RPLS T H
P L R YE R C | (
L E F TC H S N N I L
t]S vR0REFERENCE
v0L
I R O IN R - S I O N f lP
LRTHREC
L E F TC H R N N E T

t}C VOLTSOES NERSUREI]

I N P L R YE R C K

t)C VOLIAOES NEflSURTt)

IN REC
( N R( ) F F )

-----I
, n
 ,
Bang
&0lufsen 2-14 /
DIAGRAMD D

DIAGRAM D oscrLLAToR
& RE-DEcK
ELEcrRoNtc
& REsErcoNVERTER
cc$
>: | 2oscrLrATOR
< l.l ,o \o
7r=.
3-o.
a- h- -
>f-
o! < t--
' o .
arnI l- cctl

;:+"' 'l
(j)H
Z <
H Hf-

m
|/3 ICI O O
f4NCI4D F I
;::t___-_)
I - -l
P)-2r

.L
TR4
BC848B
2/3 ICI
I4HCI 4D

IAPE OSC.
8 .461|4H2/ TRls
<:, 8.5O2MHz BC8 7-40
aJ"
( J ^
R3 a sozuu.l i
qtf . T
D
. - t / sI
L r -
---.lt-J '
"22p

S M D P L A C E D O N S E C U N D A R YS I D E

m
z
0
r.' 7 p i"-'s'r r
/

C 3r r
r--'1r-
CONVERTER

C2

z <
cno'
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n <Fr
ta&(J
(JH
O

- oo
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an
ca,. R F &
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o B C 8 47 B

-- n
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ta
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 2-14 2-14
DIAGRAMD

o'
o ELECTRONIC
REDI-DECK
H
N O D U LIEI
l-.

c0
0_

( cflss I t'rl

'ARD WEW
/ C0UP1l,lENlSlhE/ REfr-REC-CT

DT0 ' r GIAtr

*@- f/[9'
-L. fa- -
Ht
th |Ir I l?01I LlI
2-15 2-15 2-1
DIAGRAME DIAGR

DIAGRAM sEEpAGE 2-16)

E cD sERvo (pcB DRAWTNG

ffi
,36t 3 5
i o m VD C 1
,2mV
I
-1.ruog=-l
rsl "' --T-
|
r00nl I
"+ l - l

i-l
I

tffi
]!t-t HF Ar

;1,,,-.
tffi
lw
@ I

fE?
'

| | rr,. I I'i:. ,, f*P

I I--u T*?
I| | E
l_[-!|*.
I l_-itrl- t-]tu
r3:,
,:;.I:*l:
) ^,,u
ll 4 /Onl
I
m DJI
&IC

l:fl ll."* ,Corr,rr'l

u,,,/ !v1
l_r________e!_e
-:c

l*=:fr;t--t'i1*
{+&
I
,l C28I6s

l"p;;=
lf,
rl(
_+-

IC7882
"*-f
MC7805C

1 1 3 5V lrnnrul fifpl t-
T2
ltul I l#.1+
r
C2882s
-lI 2^
oon
I I

t t ^ ^ t _ _ ^ t t t t t
I C7883
NlC79L05
OV

t
2 1 3
+ I C 2 8 8 5s
--T-- "
Oon
|

pleliil;l*^:,T" 1
-3 f, 3;r*l;"
N44 zP 88
r' t
Y;-tni = x,kP,.ri
I
F r -+?

tI ,
I L{tse( l

\
trl
 2-15 2-15 Bang&Olufse
DIAGRAME DIAGRAME

8 S E R V OM C I O R S Y S T E I . 4 91
v s = SMD PLACED ON SECONDARY

i;.RFd
s . [][--lsrzqo
--ll---| LJl--l L-l
, 8rs_, -l L-i L L
,.Jrr*
ffi
',r/--1Izv ;
>..1 sc

C28 8s F O C U SM O T O R A I . 4 P L I F I E R

r /2IC7803
TCAA372

A l2D q
.dI
co ll
l 9
y) tr lC282Os o
M
cr- &
l ,r ^u u
^n
I
,
c28t1
P180r-

- , J v o = a

YI
f---r
c2821L 2.5vpgp (3 CON)
]F2822

2 t 3
--T-
t n --

lloon
, RADIAL
A I 4 P LI F I E R
3 PtSOt-4

a
@
n
o ol
l")
(l A
IC 7802 38 D-r
TDA 88097 ml
col
RADIAL SERVO t t
a.
R3835s lV5

PI80t-3

O S CI L L A T O R
650 Hz

=j::
^^ 33On R383 I s
a1

l Il r r ,
' - -
U)
R A DI A L
i
(J
F

=
a

26

282qL
l c-- C282-7 sl C2826s
J
| )
,3"7-__l
T3u
33"
=F 38
33n
3 C * | |
I
I 5v
vpEr
Bang&Olufsen 2-16 2
DIAGRAMF D

DIAGRAM F cD DECoDER

. Q ,"n. -r. -.-n" - n G22

' trD ' t4', n
\J ftl
l , l l - C\l
I
)>t I
<lc\.1lrll c!
5V rl@ 6l cO
crllco <l
>l
9
o-
YI
a , l
or,
co
5VA
( 2 C O N ) f.)
t
I

, , t l l d
V D

l a
a

TR7884s RESET ST. BY

P t 8 8 2R3888s BC848

L I J
reI"*
I L
TL

TL

REtn
ICTEEI st
MC68HCO5CO8
ic

SERVO IPROCESSOR
4 k x S R O M
128 x 8 RAM
rR'7a44
8C848

t5 REdr

I4 SI,/RD

80
REOUEST/
RI
ACKNOWLEDGE

83 CLK

R388 | s

,,i'o:1.*,
nHHH$H.
R3848 ^^ D684 |

C284'7s

R384
1
. tI C 2 8 4 I s CLK DATA R/J
51 52 70
VngprVcgrnffi
46 57
Voo. VDon

MOTOR
C 2a A a 2n2
28 DATA CONTROL
S LI C E R STRVO
47 c2845| IC784 | s ,o
{ , B = o
pPROCESSOR SAA734 I
33ot l')
|J. l c
I NTERFACE DECODER,
@ F I LTER
c! Tci AND DAC
CJ I
-
l28 DIF
rBI
DAC

DIGI TAL
F ILIER
4 x OVER- DIF
CONCEALMENT S A N 4 P ILN G IBI
DAC

RAMINTERFACE
AO AI 42 A3 44 A5 A6 A7 A8 49 AIOAIIAI2DO DI D2 D3 D4 D5 D6 D7 i{E
XO X]
C2842 TZ TI
IB

T
too

A o A r A 2 A 3 A 4 4 5 A 6 4 7 A t A r o e r r A en e B G
\ \B \B \ E \ E \ B \ S\
B H H H H H H
o 5VA

IC1842 2A vcc
FCB6 IC65L_7OT C
8K x 8 STATIC RA|\4 cs2

I
2-16 2-16 2-16
IGRAMF DIAGRAMF

SMD PLACED ON SECONDARY SIDE

SPECIALLY ADAPTED SA|\4PLE

T U R NT A B L E
I ' 4 O T OA
RM P L I F I E R

rc7843
TCA
o3-72
M2
TURN
287 | s lC2855s TABLE
3o
= =3A t40T0R
ll00n ll00n
, 2
rTt4-
Dtd

- 5?jfi
Dl>c
@.- r r--
t t l
oul t l
F44--4s-.]p1ay

46 57
Voor Voon

r'40T0R
CONTROL
R3854s
IB|J
C 2 8 5 4s
DEET4.

W
( V;O
t-
4n-7

DIF R3862
IB I T
uo " l P l

l
DAC
D =
,grl
-
Pt84
SER,/
PAR -L
r
48X
RIGHT ar-l
pP IB
c2869
t 0 -r
ru
DEEI'4. re zzv9l
R 3 8 6 5s 2855s -
4nJ

D I G] T A L
OUTPUT
D6 Dl l./E
2-17 2-17 2-1
DIAGRAMG DIAGR

DIAGRAM G MrcRocoMpurER
& GEAR-sENsoR

-q G r i \ R S F T N S o R-
3,'CROPROCESSOR ll aI
J
e - t \ ' \

= SMD PLACED ON SECUNDARY SIDE

= SPECIALLY ADAPTED SAMPLE lL!
t(v

ICI

-I
R I
L I
BC8478 ,l
tz l.,t lcs, 1os
'
l.r=tJt' L
3l
jzo.]zo"fro. f oo"fo,,

OPTO

a STROBE 2
t)
(y 25 24

L2
o

Rr7
I " I. 5vsF
I
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-
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Tzzoo l)zoo
2"2
ICz*
P83C528
I
4L.LUr-^ I ! 32kx8 ROM
5 | 2x8 RAM
uPR0CESS0R
c32 .I

r)
E
220
t
o

K E Y B. D A T A

K E Y BS
. TROBE

LED CLOCK

LED DATA

t5 lcrS

]zo'!zo'l'

B RI G H T N E S S
TR2
B C 8 47 B

CD N4AST

CD SLA
1 30 c22

I" I. I"
TAPE CLOCK

TAPEDATA

rnpE ilEEEJ
23

t 4 x2 I.
I.
 2-17 2-17 Bang&Olufse
DIAGRAMG DIAGRAMG

! cran sENSOR
R

^ r R 1_ * *
rcr
z f l 5ilr -fclpllPllPl
r '
gt
l

,il
Fl,
s l
lr- Pl
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- L a
) t Q _ | I

\J

|6-1

c25

I. IR RECEIVE

I. t-3

:::ii...,I l8l P2-l

P2-2

K E Y BD
. ATA
I
KEYBS
. TROBE\ H

P2t1
lo lctS r5 t8 l9 re
f'ot" I 'I 70 7 0o T .
J.
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8 R IG H T N E S S
P28
TR2
BC847B 1 H57.

1 c30 c22

I" I " I .
co
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I col
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26
 ,
Bang
&0lufsen 2 -18 I

l
DIAGRAMH T

& tRREcEtvER
DIAGRAM H DrspLAy/ KEvBoARD

D I S P L A Y& K E Y B O A R D
s = S M D P L A C E D O N S E C O N D A R YS I D E :9
= R9 0R R25 IS | 4 O U N T E D( l -

ej<
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BCP53- | 6

4 .5V

8 " R
- "A D P 3 R
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DPI
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2d
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2d li- a. l'
2d
t ^
t n l leI s I tp_3 ^ l s I
t ocr
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5h ;; 5h

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5-1 5-1
ADJUSTMENTS

TUNERAdiustmenttable
Waverange Input frequency Input Set tuned to Adjust Output Scope / Voltmeter
V A R I C A PA L I G N M E
NT

1 0 8M H z check 7....9V
FM
8 7 . 5- 1 0 8 M H z 87.5MHz check 1.3....2V
AM 1700kHz 5 10 B 8.5Vr 0.1V
(2 band version)

LW
530- 1700kHz

1 5 3- 2 7 9 k H z
530kH z

279kH z

153kH z
check

5 10 B

check
o 1V t 0.3V

8.5Vt 0.1V

1V r 0.1V
MW 1611kHz 2142 8.5Vt 0.1V
(3 bandversion)
522-1611kH2 522kH z check '1Vt
1 0.3V
FM IF

FM
9 8 MH z l m Vrf
mod = lkHz
Af = 75kHz o 98MHz 5 10 5

8 0V t 20m V

S T E RE OC R O S T AL

9
o
check l o w< 1 V
9 BMH zl mV rf
FM 90%L+ 98MHz
9% pilot
3 13 1 <j) R m i n .ouI

S E A R C HS E N S I T I V I T Y
9 8 MH z 1 Sp rV Switchesjust
FM mod = lkHz
L f :7 5 k H z
1.2 98MHz 3125 'j/ from Highto Low

AM-IF
1494kHz - l0nF
> symmetricaland
ifrf
-Tr.l
MW Af = 1OkHz 50E,,\ 1494kHz 5104 m ax height
(c>
low as posible 1
? \.,/

AM-RF
MW 558kHz 558kH z 5107 I
mod=l kHz MAX
30%AM 1494kHz 1494kHz

o
2141
V
MW only 101117
m od= 1 kH z
30% A M

LW
mod=l kHz
560kHz

16 0 0 k H z

15 6 k H z
560kH z

1600kH z

156kH z
5 10 7

2 14 1

5 10 9
o MAX
t
]
+
+
MAX
30%AM 2 7 )k H z 27j kH z 2140
V
* i n p u tv i a
I repeat
inductive
coupling
5-1

L
ADJUSTMENTS,
ENGLISH
Bang&Olufsen
ADJUSTMENTPROCEDURE

TUNER Seesection2 for component locationdrawing and test points,if necessary.

- PlacePCB2 in serviceposition(seedismantling,section
6). Adjustmentson
PCB1 Tuner are now accessible.
(SeeTuner adjustmenttable)

TAPE RECORDER In d i c a ti o n as re for the l eft channel(ri ght channeli n brackets).

W h e n u s i n ga n audi o osci l l atorw i th si gnaloutput at al l four pi nsof the D I N
p l u g ,th e a u di o osci l l atormust be di sconnected duri ng recordi ngi n orderto
avoid fau lty measurements.

Testtapes usedfor adjustment:

Az i mu th -20 dB
6k3 Hz +1o/ollevel Part No. 6780036

'ir
Wow 3,150H z r0.1o/ol w ow0.08%
: Part No. 6780037
Torque S R K -C0-100
T g Part No. 6780046
Level 333 Hz tlo/o/250pWb t0.5 dB Part No. 6780035
CrO, ABEXTCC2O3B P a r tN o . 6 7 8 0 1 3 5
Fero, BASFR 723 DG Part No. 6780067

Azimuth - LoadAzimuth tape, part No. 6780036.

- c o n n e c tthe tw o i nputsof an osci l l oscope
to 2p21-5(L our) and 2p21-6(R
OUT) respectivelyfrom Tape pCB7.
- PressTAPE,and adjustthe screwA (side1) until the
two curveson the
o s c i l l o s c ope
are i n phaseat maxi mumampl i tude.
- PressTAPEfor 1.5secs.,thereby obtaining the reverse
direction(side2),
and adjustthe screwB until the two curveson the oscilloscope are in
p h a s ea t m axi mumampl i tude.
- Repeatthis procedureas a check.

TX6 IX6
f

Bang
&Olufsen 5-2
ENGLISH
ADJUSTMENTS,

ft Speed Load Wow tape, part No. 6780037(the adjustment must be made at the
centreof the tape).
Connecta Wow/Flutter meter or a frequencycounter to 2P21-5(L OUT).
PressTAPE.After 30 seconds'operation, adjust3705on PCB11 to 3,150
Hz +0.3o/o(seesection6 for servicepositionof PCB11).

Take-up torque Load Torque cassette,part No. 6780046.

PlacePCB2 in serviceposition(seedismantling,section6).
?r PressTAPE,and adjust 1635on PCB7 to a take-uptorque of 45-50g-cm.

Playback level Usea PegelLevelreferencetape 250 pWb/mm, part No. 6780035(*Level

referencetape 200 pWb/mm is mentionedas an alternativein brackets*):

- PlacePCB2 in serviceposition(seedismantling,section6).
- Connectan AF voltmeter to test point 8 (9) on PCB7 or to 2P21-5(2P21-6).
- PressTAPE,and then pressMODEuntil NR is flashingin the display(the
noisereductionsystemis disconnected).
- Adjust 1631(1632)on PCB7 to 620 mV (*550 mV/200pWb/mm*).

TESTMODE 22 The tape recordernoisereductionsystemis connectedautomaticallywhen

re c o rd i ng.
Electricrecordingadjustmentsin the tape recordersectionmust be made
with the noisereductionsystemdisconnected, which is done in test mode:

Connectthe productto a mainsoutlet.

t\ Within 30 secs.,press:. 2650. The displayreads:8888when the product is

in test mode.
PressAUX RECREC22 (22 = disconnectionof noisereductionsystem).
T e s tmode i s abandonedby pressi ng' or di sconnecti ng
the mai nsvolt age'

HX filter PlacePCB2 in serviceposition(seedismantling,section6).

Short-circuitcapacitor 2657on PCBT(Automatic LevelControl off).
connect a DCvoltmeterto |c7710 pin 6 (13)on PCB7.
L o a dC rO,standardtape, part N o.6780135.
Carryout the procedurementioned under TESTMODE22 above.
Adjust coil5627(5626)on PCB7 to minimum DCvoltage.
Removethe jumper across2657 afier the adjustment has been completed.

Bias PlacePCB2 in serviceposition(seedismantling,section6).

Short-circuitcapacitor2657on PCBT(AutomaticLevelControloff).
Connectan audio oscillatorto the AUX input, 333 Hzl30mV.
Connectan AF voltmeter to test point 2 (3) on PCB7 or to 2P21-5(2P21-6).
Load CrO,standardtape, part No. 5780135.
Carryout the procedurementionedunder TESTMODE22 above.
'I} Ad j u stthe audi o osci l l atorunti l 30 mV i s measured.
Adjust 1626(1627)on PCB7 until the playbacklevelat 333 Hz and 12,500
Hz is the same(approx.30 mV) by first recordingand then playingback
333 Hz and 12,500Hz. PressAUX RECREC22 everytime a recordingis
made and <STEPand TAPEeverytime the recordedpieceis to be
5-3 Bang&Olufsen
ADJUSTMENTS,
ENGLISH

reproduced.STOPmust not be used. (Lessbiasproducesa treble boost,

mo re bi asa trebl e drop.)
- check the adjustmentwith an Fero,standardtape, part No. 6790067.lf
the resultdeviatessignificantly,adjustto the mean value between CrO/
FerOr.
- Removethe jumper across2657a{1terthe adjustment has been completed.

Record current PlacePCB2 in serviceposition(seedismantling,section6).

short-circuitcapacitor 2657on PCB7 (Automatic Levelcontrol off).
Connectan audio oscillatorto the AUX input, 333 Hzl100mV.
connect an AF voltmeter to test point 2 (3) on pcB 7 or to 2p21-5(zp21r-6).
Load CrO,standardtape, part No. 6780135.
Carryout the procedurementioned under TESTMODE22 above.
Adjust the audio oscillatoruntil 200 mV is measured.
Adjust 1633(1634)on PcB7 until the playbacklevelis 200 mv by first
recordingand then playingback 333 Hz. pressAUX RECREc22 everytime
a recordingis made and <STEP and TAPEeverytime the recordedpieceis
to be reproduced.STOPmust not be used.

f{
CD The optical pick-upis extremelysensitiveto staticelectricity.The work site
must therefore be protected againststatic electricity. Carelesstreatment of
the optical pick-upmay reduceits life dramatically.
The CD drive mechanismand PCB8 must be connectedwhen the product is
connectedto a mainsoutlet.

Laser current lmportant:

Presetthe lasercurrent potentiometer,8R3813,when replacingthe CD drive
mechanism,and checkthe connectionto the monitor diode before
connectingthe productto a mainsoutlet.

tl ER3B00
- l
_
rc78oo
:
I l
01
I

r - - l

r @ l
L - J

R3BI3

Removethe rear panel (seedismantling,section6).

Connectan ohmmeter from pin 18 to pin 27 of 81C7800.
Adjust 8R3813,coordinate3D, until 1 Kohm is measured.
Connecta DCvoltmeter across8R3800,coordinate3C.
Connectthe productto a mainsoutlet, and pressLOAD. Loadtest discNo.
5 (CDwithout errors,part No. 3634031).
PresscD. The voltage across8R3800must be higherthan 15 mV,
otherwisethe product hasto be switchedoff and the error found.
lf the voltage across8R3800is higher than 15 mv, playtrack 1 on test disc
5 , a nd adj ust8R 3813unti l 50 mV + 2 mV i s measured.

NorE: lf the voltage across8R3800is lessthan 25 mv, the CD may stop

shortlyafter having been started. The adjustmentmust therefore
be made immediatelyafter starting.
 f

Bang
&Olufsen 5-4
I
ADJUSTMENTS,
ENGLISH

fr TOUDSPEAKER
Adjustment of bass/treble level H a sto be carri edout onl y w hen repl aci nga speakeruni t, P C B2 A mplif ier ,
PCB3 Microprocessor or 31C4.

TESTMODE 13 Thistest mode allows manualadjustmentof the bassand treble levelsof the
s p e a kers,
and i t i s avai l abl ei n stand-byonl y.

- Connectthe productto a mainsoutlet.

- Within 30 secs.,press:o 2650. The displayreads:8888when the product is
in test mode.
- Press13.
The presentadjustmentis shown in the display:

'X '=lefttreble.
' X '=leftbass.
' X '=righttreble.
' X ' = ri ght bass.

Testmode is abandonedby pressing. or disconnectingthe mainsvoltage.

?q
Replacement of PCB 2 Amplifier Connectthe new PCB2 Amplifier with the exceptionof 2P28(R OUT)and
2P2s(L OUT).
Transferthe labelconcerningspeakeradjustmentfrom the old PCB2 to
the new PCB2.
Connectan AC voltmeterto that speakerunit which hasthe weakest
output accordingto the label.

LB (left bass): X.XX VAc 2P29-3 RB (right bass): X.XX VAc 2P28-3
LT (left treble): X.XX VAc 2P29-1 RT(right treble): X.XX VAc 2P28-1
Left ground: 2P29-2 Right ground: 2P28-214

C o nnectan audi o osci l l atorto the A U X i nput.

Bass : 700 HzJl mY.
Treble : 7200 HzJl mV.
Carryout the procedurementioned under TESTMODE 13 above.
Adjustto maximumoutput: Display= 9999. lf necessary, selectspeakerby
meansof STEb (the activespeakerflashes)and then press9.

.r1 PressSTORE.
PressAUX.
P re ssn unti l the vol ume reachesmaxi mum(di spl ay= 72). A dj ustb alance,
bassand treble to neutral level,and loudnessoff.
Adjust the audio oscillatoroutput voltage until:
the voltage on the AC voltmeter = weakestoutput on label.
Measureand make a note of the voltage at the three other speaker
outputs by meansof the AC voltmeter:

LB (left bass,700H2): X.XX VAc 2P29-3

LT (left treble, 7200H2): X.XX VAc 2P29-1
Left ground: 2P29-2

RB(right bass,700H2): X.XX VAc 2P28-3

RT(right treble, 72O0Hz): X.XX VAc 2P28-1
R i g htground: 2P28-2t4

The differencebetweenthe rated voltage statedon the labeland the

measuredvoltage hasto be calculatedfor the three speakerunits:
I
th 1*::l::?."=^
Measuredvoltage
5-5 Bang
&0lufsen
ADJUSTMENTS,
ENGLISH

X C OD E
> 1.00 9
0.87 8
0 .7 5 7
0 .6 s 6
0.56 5
0.49 4
0.42 3
0 .3 7 2
0 .3 2 1

- PerformTESTMODE 13,and enter the digit (CODE)correspondingto the

calculateddifference(X) betweenthe three speakerunits.
- PressSTORE when all four speakerunits havethe desiredcoding.
- PressAUX, and checkthat the measuredvoltagescorrespondto those
statedon the label.

Testmode is abandonedby pressing. or disconnecting

the mainsvoltage.
lrl
Replacement of PCB 3 or 3lC4 The bassand treble levelsof the speakersare storedelectronicallyin lC4
(EE PR OM) on P C B3. W hen repl aci ngP C B3 or 31C 4,
the ori gi nalbassand
treble levelvalueshaveto be storedagain:

- lf the old valuesare accessible,

enter them in TESTMODE 13. PressSTORE
when all four speakerunits havethe desiredcoding.
- lf the old valuesare not accessible,
see:Replacementof PCB2 Amplifier.

Replacement of a speaker unit A measuredvalue in dB is printed on the backof the new speakerunit. This
v a l u e i s usedfor adj usti ngthe soundl evel ,w hi ch i s,donei n TE S TMODE13:

- Make a note of the value printed on the backof the new speakerunit,
and replacethe old unit with the new one.
- C a rr yout the proceduredescri bedunderTE S TMOD E13.
- The rated value printed on the backof the speakerunit may be either
positiveor negative:
Pos.: lf the rated value printed on the backof the speakerunit is
positive,dampenthe unit in questionby X number of steps.lf t1
necessary, selectspeakerby meansof STEP>(the active speaker
flashes),and then enter a new digit (seetable).
N e g .: l f the ratedval uepri ntedon the backof the speakeruni t i s
negative,dampenthe three other units by X number of steps.
Selectthe three speakersby meansof STEP>(the activespeaker
flashes),and then enter new digits (seetable).

Kateo value In oB X stepsdown

U.UU
+/- 0.25 0 stepsdown
+/- 0.50
+l- O.75
+/- 1.00
+ l - 1.25 1 step down
+/- 1.50
+ l - 1.75
+l- 2.O0 2 stepsdown

PressSTORE
/,tI
when all four speakerunits havethe desiredcoding.

Testmode is abandonedby pressing. or disconnectingthe mainsvoltage.

\

Bang
&Olufsen 5-6
TIP5,ENGLISH
REPAIR

eir REPAIRTIPS
Lubrication T h e n eedfor subsequentl ubri cati oni s mi ni mal .In connecti onw i th major
checksand replacementof mechanicalparts it may be necessary to apply a
little lubricant(seeexplodedview, section4).

Replacement of CD drive The optical pick-upis extremelysensitiveto staticelectricity.The work site

mechanism must therefore be protectedagainststaticelectricity.Careless treatment of
the optical pick-upmay reduceits life dramatically.
The CD drive mechanismand PCB8 must be connectedwhen the product is
connectedto a mainsoutlet.

- Loosenthe two transport screwsA for CD.

Removethe CD front frame (seedismantling,section6, if necessary).

Removethe CD cover plate by looseningthe four pins (markedwith
arrows).
fi tti ng.
Make a depth adj ustmentby bendi ngthe spri ng-l oaded
Make the lateralcentringby adjustingthe two springslaterallyon the
f i tti ng.
s p r i ng-l oaded

TAPE
Wow frequencies W OW FR E QU E N C IE S

Frequency Foult source Pos. no.

1 . 7H z Pinchroller, left 9407

?D 1 . 7H z
4 . 1H z
P i nchrol l er,ri ght
D ri vi ngbel t
9411
9455
6.0 H z Flywheelleft 9438
7 . 6H z Flywheelright 9451
29.6 Hz Motor (capstan) 9453

TESTFUNCTIONS BeoSoundCenturycan be brought into TESTMODE,thereby providingthe

fol lowing possibilities:

D i spl ayof tuner vari ant.

Gearboxtest.
Keyboardtest.
LEDtest.
Displayof softwareversion.
Presettingof EEPROM 31C4.
Continuousoperationof tape recorder.
Speakersound leveladjustment.
CD test.
5-7 Bang
&0lufsen
r
REPAIR
T I P S ,E N G L I S H

TESTMODE ln test mode the productcan be operatedin the ordinaryway with the
exceptionof the digits (selectionof new test mode).
iI
- Connectthe productto a mainsoutlet.
- Within 30 secs.,press:o 2650.The displayreads:8888when the product is
in test mode.

Testmode is abandonedby pressing. or disconnectingthe mainsvoltage.

Display of tuner variant B ri n gt he producti nto TE S TM O D E .

Press08 Display V ari ant
0: Tunervari anterror
1: EU
2: GB
3: USA
4: JAP

Gearbox test B ri n gt he producti nto TE S TMOD E .

Press09. Door sensoris disconnected.
Press17. Door is closed. Removeglassdoor.
P re s s16. D oor i s opened.
P re s s18. C D cl amperi s opened.
P re s s19. C D cl amperi s cl osed.

Keyboard test B ri n gt he producti nto TE S TMOD E .

Press05
T h e d i spl ayshow sthe row and col umnnumberof the key:

r1cl MODE r3c5 TU N E

r1c2 REC r3c6 v
r1c3 S TOR E r3c7 o
r1c4 SOUND r2c1 0
r1c5 n r2c2 1
r1c6 LOA D r2c3 2
r2c4 RADIO r4c1 3
r2c5 CD r4c2 4
r2c6
r3cl
TAPE
AUX
r4c3
r4c4
5
6 {'l
r3c2 <STEP r4c5 7
r3c3 STOP r4c6 8
r3c4 STEP> r4c7 9

Disconnectthe mainsvoltageto abandonTESTMODE05, or press06 on a

B e o l i n k1000remotecontroltermi nal .

LED test B ri n gt he producti nto TE S TMOD E ,

Press23.
Al l L ED ' sare sw i tchedon.

Display of software version B ri n gt he producti nto TE S TMOD E .

Press26.
Display: X.XX

fl
 Bang
&Olufsen 5-g

l
REPAIR
TIPS,ENGLISH

Presetting of EEPROM - Bringthe product into TESTMODE.

- Press07.
while presetting.
Display:07. Flashes
The presetprogrammesare deleted.
Volume - 30; balance,bassand treble in neutral;loudnesson.
Noisereductionon.
Autoreverseon.
Speakersound leveladjustmentis not affected.
- Disconnectthe mainsvoltagewhen the presetprocedurehasbeen
completed.

Continuous operation of tape - Bringthe product into TESTMODE.

recorder - PressTAPE.
- Press38.
The tape recorderplayscontinuously,i.e.30 secs.on side2,30 secs.on side
1 etc.,until 37 is pressed.

Speaker sound level adjustment To be performedwhen replacingPCB3 Microprocessor, 31C4,PCB2 Amplifier

C A
1 7 i ' or a speakerunit. Seesection5 for adjustmentprocedure.

CD test - B ri ngthe producti nto TE S TMOD E .

- PressCD. The following error messages will be displayedin test mode
when playinga CD (discwithout errors,part No. 3634031):

D i spl ay:
2: Focuserror.
H asa C D been l oaded?
Doesthe laserswitchon? LO 81C7800-17.
Doesthe FEoutput regulate?FE81C7800-15.
D oesthe focusmotor regul ate?FOC +8P 1801-l /FOC 8P- 1801- 2.
3: R adi alerror.
Doesthe RADoutput regulate?RAD81C7802-15.
D oesthe radi almotor regul ate?R A D +8P 1801-4/R A 8P1801-
D- 3.
4: Turntablemotor error.
Doesthe PWMA output regulate?PWMA 81C7841-28.
Doesthe turntable motor receiveDCvoltage?TTM+ 8P1842-1lTTM-
8P1842-2.
5: TL is low for more than 50 msec.
C heckTL 81C 7800-11.
6: Jump/Steperror.
Checkeyepattern.HF8C2843,test point 3.
Checkdata transmission. R/A,DATA and CLK81C7881-1111019.
7: Subcodeerror, no subcodewithin 3 secs.
Checkdata transmission.
8: TOCerror. Outsidethe "lead in" area while TOC(programcontent)is
bei ng read.
Checklaserarm mechanics.
30: Communicationerror between PCB3 Microcomputerand Servo
microprocessor.
Checkdata transmission. Master/Slave 81C7881-27
128.

Removethe CD if you

Press40. Laserswitcheson, and focusis searchedfor (focusis searched

for everytime 40 is pressed).
Press42. Turntablemotor starts,and the laserswitcheson and goes into
starting position.
Press43. Turntablemotor stops,and the laserswitchesoff and goes into

Press44. Laserarm movestowards extremeoutsideposition.

Press45. Laserarm movestowardsthe centre.
 7

5-g Bang&Olufsen
REPAIR
TIPS,ENGLISH

Loadthe CD (LOAD). (l
- Press46. CD startsplayingfrom lead in (display= 0). No sound is
producedby the speakers.
- Press47. CD brakesand stopsplaying.
- PressCD.
- Press48. CD winds towardsthe extremeoutsidepositionand stops
there.
- Press49. CD winds towardsthe centreand stopsthere.

Testmode is abandonedby pressing. or disconnecting

the mainsvoltage.

Checking the laser supply The laser,the lasersupplyin 81c7800and the monitor diode form a feed-
backsystem.A defect in the lasersupplymay resultin destructionof the
laser.

As it is impossibleto checkand repaira feed-backif one part of the systemis

missing,the lasersupplycan be checkedby meansof the below circuit.

The green LEDreplacesthe laser.The voltageacrossthe l8ohm resistoris the /I

feed-backvoltage for the monitor.The 33ohm resistorand the switch make
it possibleto changethe power consumptionfrom the lasersupply.

l
TOLO 8Pt80t-6

T0 LM 8Pt80t-7 !.oNrr.r., DTRECTLy

t r r H Es E R v O
P C B8
I
l ^ ^ . ^ ^ .
tuJdPtdut-3 )

GreenLED,e.g. CQY94,part no. 8330054.

Removethe flex PCBfrom Pl801 on the pCB8.

Connectthe above-mentionedcircuitto pl801 on the pCBg.

fl
ConnectSl (pin 6 of 81C7800)
to ground.

when st (stan Initialization)low, the lasersupplycan be switchedon in

TESTMODE. Then pressCD and 40.

M e a s u reth e LO vol tageon pi n 6 of 8P 1801.

51open:
L O fro m 1 .8V to 2.3V
LM from 170 mV to 220 mV
T h e g re e n L E Demi tsl i ttl e l i ght

S'l closed:
L O fro m 1 .8V to 2.3V
LM from '170mV to 220 mV
T h e g re e n L E Demi tsl i ttl e l i ght

D u ri n gth e changefrom 51 cl osedto 51 open,the LE Dw i l l shortl yemi t mor e

light than usual.The feed-backsystemensuresthat the sameamount of
current passes through the LEDirrespective of whether S1 is open or closed.
II Bang
&0lufsen
EINSTELLU
NGEN, DEUTSCH
5-10

"h EINSTELLVORGANG

TUNER Sieheevtl. Abschnitt2 wegen Komponentenplazierungsskizze

und
M e Bpunkte.

PCB2 in Service-Position bringen (siehehierzuAbschnitt6'Zerlegung').

auf P C B lTunersi ndj etzt zugdngl i ch.
E i nstel l ungen
(Tuner-Einstel lungstabelle am seite5-1)

CASSETTEN.RECORDER D i e Hi nw ei sebezi ehensi chauf den l i nkenK anal(di e i n K l ammern

angefUhrtenHinweisebeziehensichauf den rechtenKanal).
B e iA n w endungei nesTongenerators, der S i gnal ean al l evi er A nsc hlusse
des
DlN-Steckers h i nausgi bt, m u B der Tongeneratorbei Wiedergabebetrieb
abgeschaltetwerden, um Falschmessungen zu vermeiden.

Fur die Einstellungenzu benutzendeTest-Cassetten:

A z i m ut -20d8
6.3kH z+ 1% P egel Bestell-Nr. 6780036
Wow o/o
3 150Hz+0,1 / ow: <0,08o/o
-W Bestell-Nr. 6780037
'Torque' SRK-CT 0-1009 Bestell-Nr. 6780046
Pegel 333Hz+1%/250pWb+0,5dB Bestell-Nr. 6780035
CrO, ABEXTCC2O3B B estel l -N 678013
r. 5
Fero, BASFR 723 DG Bestell-Nr.6780067

Azimut Azimut-Cassette einlegen(Bestell-Nr. 6780036).

Die beiden EingdngeeinesOszilloskops an 2P21-5(L OUT)bzw. 2P21-6(R
OUT)von Tape PCB7 anschlieBen.
TAPEdrUcken,und mit der SchraubeA (Cassettenseite 1) so lange
a b gl ei chen,bi sdi e bei denK urvenam Oszi l l oskop
bei max.A mplit ude
g l e i chphasisi
g nd.
TAPE>1,5s Drucken,wodurch 'Reverse'-Richtung (Cassettenseite 2) erzielt
w i rd, und mi t der S chraubeB so l angeabgl ei chen, bi sdi e bei denKur ven
a m Oszi l l oskop bei max.A mpl i tudegl ei chphasisi
g nd.
Z ur K ontrol l eden V organgw i ederhol en.

IFI

?n
 Bang
&0lufsen 6-1
DISASSEMBLY

a DISMANTLING ZERLEGUNGBS2OOO DESASSEMBLAGE,BS2OOO

When the rear panel is removed,PCB Wird der R0ckwandteilentfernt, so Aprdsavoir d6pos6la face arridre,il
1 Tuner,PCB5 Powersupplyand s i n ddi e fol gendenP l ati nen est possibled'acc6deraux cartes
'PCB 1 Tuner" (s6lecteurde canaux),
Motor control,PCB7 Tape,PCB8 CD z u g dngl i ch:P C B1 Tuner,P C B5
und "PCB5 Powersupplyand motor
and P CB10 M a i n sa re a c c e s s i b lAl
e.l Stromversorgung
other componentscan be serviced Motorsteuerung(PowerSupplyand control" (alimentation6lectriqueet
from the front, includingadjustment Motor Control),PCB7 Tape, PCB8 commandemoteur),'PCB 7 Tape"
of PCB1 Tuner and PCB7 Tape. C D u nd P C B10 N etztei l(Mai ns).A l l e (platine-cassettes), PCB8 CD"
UbrigenKomponentenkdnnen von (pl ati nel aser)et " P C B10 M ains"
der Frontseiteaus gewartet werden, (secteur).Le servicede maintenance
Glass door e i n schlE von P C B1 Tuner
. i nstel l ung peut intervenirsur tous lesautres
- P ulls t r aig h to u t o f th e s l i d i n g u n d P C B7 Tape. composantsdepuisla face avant,
bracket. m6me pour r6gler lescartes"PCB1
Tuner" et "PCB7 Tape".
Glastiir
Front fabric frame - G l asturausdem S chl i tten Porte vitr6e
- Removetwo screwsfrom the h erauszi ehen. - La sortir du chariot en tirant vers
cornersof the rear panel. soi .
- P ullout t h e fro n t fa b ri cfra me a
t little at the bottom, outside
c or nerand p u s hi t o u t to th e s i d e .
Frontstoffrahmen
- ln den Eckendes Ruckwandteils 2
Panneau frontal d6coratif en
tissu
Schraubenentfernen. - E nl ever2 vi sdansl esc oinsde la
- Frontstoffrahmenan der unteren face arridre.
Handle/PCB21 Active antenna d uB erenE ckeei n w eni g - Ti rerl 6gdrementsur l e panneau
- Removetwo screws. herauszi ehen und zur S ei tehi n frontal d6coratifen tissuen le
- P ullt he ha n d l es tra i g h tb a c k verschieben. prenant sur l'ext6rieurdu coin
(becauseof the socket). inf6rieur.Repousser sur le cot6.

Handgriff/PCB 21 Aktivantenne Poign6e/carte "PCB 21 Active

- 2 Schraubenentfernen. antenna" (antenne active)
- Handgriffgerade nach hinten - E nl ever2 vi s.
ziehen(wegen Steckverbindung) - U ne fi cheobl i gede ti rer la
poigneeversI'arridreet d
l ' hori zontal e.

0
6-2 Bang
&Olufsen

I
DISASSEMBLY

Rear panel Riickwandteil Face arriire

- Removethe two covers(or - D i e b e i denD eckel(oderden - Enleverlesdeux couvercles(ou la
handle)on the rear panel (two Handgriff)am Ruckwandteil(2 poignee)de la face arridre(2 vis).
screws). Schrauben)entfernen. - E nl ever16 vi s reper6espar u n A
- Remove16 screwsmarkedA - Hinter den Frontstoffrahmen16 sur la face arrieredes panneaux
behind the front fabric frames. Sc h ra uben (Marki erungA ) frontaux d6coratifsen tissu.La vis
The screwA behind the gearbox entfernen. A masqu6epar l a pi gnonne r ie
becomesvisiblewhen the gear of D i e S c hraubeA hi nter dem apparaiten tournant la roue
the gearboxis turned Getriebekommt zum Vorschein, dent6edansl e sensanti hor air e.
anticlockwise. w e n n dasZahnraddesGetri ebes - D6brancherla fiche 2P3O,
- Removeplug 2P30,coordinate1C. g e g e nden U hrzei gersi nngedreht coordonnees 1C .
- P ullt he r ear pan e ls tra i g h tb a c k w i rd . - D6poserla face arridreen la tirant
when the foot hasbeen removed - Steckverbindung 2P30, aprdsavoir enlev6l'embase
(remountchassis on foot). K o o rd i nate1C , abmonti eren. (remonterle ch6ssis sur l'embase).
- Ruckwandteilnach Entfernendes
F u B e sgeradenachhi nten zi ehen
(C h a ssiwsi eder auf FuB
montieren).

r?f

N t \ i
'1,
''i\ t\

l
A
i
-?. I

?il.'
-'
'to
:'o_
A
---

Bang
&Olufsen 6-3
D IS A SSEM BLY

o) CD front frame/PCB 20 Door

sensor
CD-Frontrahmen/PGB 20
Tiirfiihler (Door Sensor)
Panneau frontal d6coratif de la
platine laser/carte "PCB 2O Door
- Removethe front fabric frames. - Frontstoffrahmenentfernen. sensor" (6metteur-r6cepteur de
- Removethe four screwsholding - D i e 4 S chrauben desC D - la porte)
the CD front frame. Frontrahmensentfernen. - E nl everl espanneauxfront aux
- Loosenthe four gearbox screws - Die 4 Schraubendes Getriebes d6coratifsen tissu.
marked D, and pushthe gearbox (Marki erungD ) l 6sen,und - Enleverles4 vis maintenantle
to the left. Getriebenach linksverschieben. panneaufrontal d6coratifde la
- Take out the CD front frame and - C D -Frontrahmenherausheben pl ati nel aser.
turn it 90 degreestowards the left u n d um 90" nachl i nksdrehen,bi s - Desserrerles4 vis D de la
unt il t he c lam p e ra rm g o e so u t o f d e r ' C l amper' -A rmausdem pi gnonneri e.R epoussel a r
meshwith the gearbox. Getriebeausgerastetist. pi gnonneri eversl a gauche.
- Sortir le panneaufrontal d6coratif
de la platine laseren le soulevant,
le tourner de 90" versla gauche
j usqu' dce que l e l evi erdu
f mai nti enne soit plus
di sposi tide
en pri seavecl a pi gnonner ie.

CI

OD

?)
6-4 Bang
&Olufsen
DI5455EMBLY

Tape/Keyboard front frame

- Removethe front fabric frames.
- Removethe four screwsholding
the Tape/Keyboard front frame.
- Pullout the Tape/Keyboard front
Tape/Keyboa rd-Frontrahmen
- Frontstoffrahmenentfernen.
- Die 4 SchraubendesTape/
Keyboard-Frontrahmens
entfernen.
Panneau frontal d6coratif Tape/
Keyboard (platine-cassettes/
clavier)
- Deposerlespanneauxfrontaux
decoratifsen tissu.
I
frame when the foot has been - Den Tape/Keyboard-Frontrahmen - E nl everl es4 vi s mai ntenantle
removed(remountchassis on nach Entfernendes FuBes panneaufrontal decoratifde la
foot). herausziehen(Chassis wieder auf platine-cassettes et du clavier.
F u Bm o nti eren). - Sortir le panneaufrontal de la
platine-cassettes et du clavier
Gearbox/PGB 9 Gear sensor aprdsavoir enlev6l'embase
- Removethe front fabric frames. Getriebe/PGB 9 Getriebefiih ler (remonterle ch6ssis sur l'embase).
- Turn the gear of the gearbox - Frontstoffrahmenentfernen.
a nt ic loc k wisun
e ti l th e s l i d i n g - Zahnraddes Getriebesgegen den Pignonnerie/carte "PCB 9 Gear
bracketfor the glassdoor and the U h rz e i gersi nndrehen,bi sder sensor" (capteur de pignonnerie)
C Dc lam perar e i n th e o p e n S c h l i ttender Gl asturund C D - - D6poserlespanneauxfrontaux
p os it ion. 'Clamper'in offener Position
d6coratifsen tissu.
- Pullt he s lidingb ra c k e tfo r th e stehen. - Tourner la roue dentee de la
glassdoor free of the gearbox - Schlittender Glasturvom pi gnonneri edansl e sens
a r m in t he open p o s i ti o n . Ge tri e bearmi n P osi ti on' Offen' anti horai rej usqu' dce que l e
- Removethe four gearboxscrews fre i h e b en. chariotde la porte vitr6e et le
mar k edD. - D i e 4 Schrauben desGetri ebes di sposi tide
f mai nti endu C D
- Pullout the gearbox(ease (Ma rk ierungD ) entfernen. soienten positionouverte.
gearboxand clamperarmsfree) - G e tri e beherauszi ehen (Getri ebe- - En positionouverte,degager le
a nd r em ov et he p l u g s5 P 1 7a n d u n d ' C l amper' -A rmvorsi chti g chariotde la porte vitr6e du bras
5P18. h e ra u sl 6sen),und di e de l a pi gnonneri e.
- Dismantlethe gearboxby S te c k v erbi ndungen 5P 17 und - E nl everl es4 vi s D de l a
removingthe four screwsE. 5 P 1 8a bmonti eren. pi gnonneri e.
- Z u m Z e rl egendesGetri ebesdi e 4 - S orti rl a pi gnonneri e(d6gag er
S c h ra uben (Marki erungE ) avecpr6cautionle brasde la
Sliding bracket for glass door entfernen. pi gnonneri eet l e l evi erdu
- P ullt he s lidingb ra c k e tfo r th e di sposi tide
f mai nti en).
glassdoor free of the gearbox D ebrancherl esfi ches5P 17et
ar m in t he open p o s i ti o n . Schlitten fiir Glastiir 5P18.
- P us ht he s lidingb ra c k e td o w n a n d - Sc h l i tt ender Gl asturvom - D 6sassembl ler a pi gnonnerieen
off. G e tri e bearmi n P osi ti on' Offen' enl evantl es4 vi s E .
fre i z i ehen.
- Sc h l i tt ennachunten drU ckenund Chariot de la porte vitr6e
Transformer abnehmen. - En positionouverte,degagerle
Removethe front fabric frames. chariotde la porte vitree du bras
Removethe Tape/Keyboardfront de l a pi gnonneri e.
fr am e. Transformator - A ppuyersur l e chari otpour le
Rem ov eplug 10 P 1 2 . - Frontstoffrahmenentfernen. d69ager.
Removefive screws. - Tape/Keyboard-Frontrahmen
P ullout t he t r an s fo rme r,a n d entfernen. Transformateur
r em ov e5P 13and 5 P 1 8(p u l lth e - Steckverbindung1OP12 - Deposerlespanneauxfrontaux
two leadsout of the spring- a b m o n ti eren. d6coratifsen tissu.
loadedsocketby pushinga - 5 Schraubenentfernen. - E nl everl e panneaufrontal
pointed object into the free hole - Transformatorherausziehenund decoratif de la platine-cassettes et
abovethe leadto be removed). 5 P1 3u n d 5P 18abmonti eren(di e du cl avi er.
b e i d e nLei tungenausden - D6brancherla fiche 10P12.
Federanschl ussenherausziehen. - E nl ever5 vi s.
(Hierzuist ein spitzerGegenstand - Sortir le transformateuren le
i n d a sfrei e Lochuberj eder der zu tirant et d6brancherlesfiches
l6sendenLeitungen 5P 13 et 5P 18(sorti rl esdeux f ilsde
h i n e i nzudrucken). la fiche d ressorten enfonqantun
objet pointu dans l'orificelibre
surmontantl e fi l a degager) .
 Bang
&Olufsen 6-5
DISASSEMBLY

o) PCB 1 Tuner/PCB 17 Front end

Servicepositionfor the primaryside
PCB 1 Tuner/PCB 17 'Front End'
Service-Position fur die Primiirseite
Cartes "PCB 1 Tuner" (s6lecteur
de canaux)/"PCB 17 Front end"
can be obtained by turning PCB2 k a n n dadurcherzi el tw erden,daB ll est possibled'amenerle cot6
into serviceposition. PCB2 in Service-Position gedreht pri mai reen posi ti onde ma int enance
- Removethe rear panel. wird. en pivotant la carte PCB2 dansune
- Removethree screws,and turn - Ruckwandteilentfernen. positioncorrespondante.
PCB1 into serviceposition. - 3 Schraubenentfernen,und PCBl - D6poserla face arridre.
Rememberto connectthe ground in Service-Position verdrehen. - Enlever3 vis et pivoter la carte
leadt o t he a n te n n ap l u g w h e n B e i mZ u s a m m e n b amu u Bd i e PCB1 en positionde
r eins t alling . M a ssel ei tung w i eder mi t der mai ntenance. N e pasoublierde
Antennensteckbuchse verbunden relier le c6blede masseA la prise
w erden. d'antennelorsdu montage.
PCB2 Amplifier/PCB 22 Active
filter
- Removethe right-handfront PCB 2 Verstdrker (Amplifier)/PcB Cartes "PCB 2 Amplifier"
f abr icf r am e . 22 Aktiv-Filter (ampl if icateur)/" PCB 22 Active
- Removethe six screwsmarked B - RechtenFrontstoffrahmen filter" (filtre actif)
on PCB2, and turn PCB2 into entfernen. - D6poserle panneaufrontal
serviceposition. - D i e 6 S chrauben
(Marki erungB ) d6coratifdroit en tissu.

ol auf PCB2 entfernen,und PCB2 in

Service-Position bringen.
- Enleverles6 vis B de la carte PCB2
et pivoter cette carte en position
de mai ntenance.
l"l

B
qfl'

OD
s
\

att -
6foB
.\ - f f i . ..'
tl
..9

t)
 6-6 Bang
&Olufsen
DISASSEMBLY

PCB 3 Microprocessor
- Removethe Tape/Keyboardfront
frame.
- Removethe plugs,lift the spring-
l o adedpins( one in e a c hs i d e )a n d
PCB 3 Mikroprozessor
- Tape/Keyboard-Frontrahmen
entfernen.
- Steckverbindungen entfernen,
anheben(ei nerauf
F e d e rz a pfen
Carte "PCB 3 Microprocessor"
(microprocesseur)
- D6poserle panneaufrontal
decoratifde la platine-cassettes
du cl avi er.
et
I
p ull out P CB3. jeder Seite)und PCB3 - D6brancherlesfiches,souleverles
h e ra u s zi ehen. ergots6lastiques(un de chaque
cote) et sortir la carte PCB3 en la
PCB4Display&Keyboard ti rant.
- Removethe Tape/Keyboardfront PCB4Display&Keyboard
fram e. - Tape/Keyboard-Frontrahmen Carte "PCB 4 Display &
- Removethe stiffeningplate and entfernen. Keyboard" (affichage et clavier)
lift PCB4 free of the Tape/ - Versteifungsplatte entfernen,und - D6poserle panneaufrontal
Keyboardfront frame. Tape/Keyboa rd-Frontrahmen decoratif de la platine-cassettes
et
fre i h e b en. du cl avi er.
When replacingcontactfoil, the - Deposerla plaquede renfort et
cover plate may be cut free of pCB4 Zum Austauschder Kontaktfolie souleverla carte PCB4 pour la
with a knife/scissors. kann die Abdeckplattevon PCB4 d6gagerdu panneaufrontal
f reigeschnitten werden. decoratif de la platine-cassettes
et

PCB 5 Power supply and motor

control
Servicepositionfor the primaryside
PCB 5 Stromversorgung und
du cl avi er.

Pourchangerle film de contact,il est

fIr
Motorsteuerung (Power Supply possiblede decouperla plaque de
can be obtained by removingthe and Motor Control protectionafin de l'enleverde la
gearbox. Service-Position fur die Primdrseite carte PCB4.
- Removethe rear panel. kann durch Entfernendes Getriebes
- Removethe two transport screws erzieltwerden. Carte "PCB 5 Power supply and
for CD as well as the two screws - RUckwandteilentfernen. motor control" (al imentation
h o l dingt he m et al re a r p l a te . - Die beidenTransportschrauben 6lectrique et commande moteur)
- LoosenPCB5 by meansof the two fu r d e n C D -Teisowl i edi e bei den ll est possibled'amenerle c6t6
sp r ing- loaded pins ,a n d re m o v ea l l S c h ra u ben,di e di e R U ckpl atte aus pri mai reen posi ti onde mai ntena nce
p l u gs . MetalI festhalten,entfernen. en d6posantl a pi gnonneri e.
- P C B5 m i t H i l feder bei den - Deposerla face arridre.
F e d e rz a pfen l osenund al l e - Enleverlesdeux vis de transfert
PCB6lR receiver Steckverbindungen abmontieren. du C D ai nsique l esdeux vi s
- Removethe CD and Tape/
mai ntenantl a pl aquemetal l i que
Keyboardfront frames. arri dre.
- Pullout PCB6 into service PCB 5 lR-Empfdnger (lR Receiver) - Degagerla carte PCB5 en agissant
p o s it ion. - CD-und Tape/Keyboard- sur lesdeux ergotselastiqueset

PCB 7 Tape/PCB12 Oscillator

Frontrahmenentfernen.
- PCB6 in Service-Position
h e ra u s z i ehen.
debrancherl ' ensembl edesfi ches.

Carte "PCB 5 lR receiver"

o
Servicepositionfor the primaryside (r6cepteur lR)
can be obtained by turning pCB2 - D6poserle panneaufrontal
into serviceposition. PCB 7 Tape/PCB12 Oszillator decoratifde la platine laseret de
- Removethe rear panel. Service-Position fur die Primiirseite l'ensemble platine-cassettes/
- LoosenPCB7 by meansof the k a n n d a d u rcherzi el tw erden,daB cl avi er.
sp ring- loaded
pin. PCB2 in Service-Position gedreht - Sortir la carte PCB6 pour l'amener
w i rd . en positionde maintenance.
- R u c k w a n dtei l entfernen.
- PCB7 mit Hilfe des Federzapfens Cartes "PCB 7 Tape" (platine-
losen. cassettes)/"PGB 12 Oscillator"
(oscillateur)
ll est possibled'amenerle cote
pri mai reen posi ti onde mai ntenance
en pivotant la carte PCB2 dans une
positioncorresponda nte.
- D6poserla face arridre.
- Degagerla carte PCB7 en agissant
sur lesdeux ergotselastiques.
 Bang
&Olufsen 6-7
DISASSEMBLY

ol PCB 8 CD
- Removethe rear panel.
PCB 8 CD
- Ruckwandteilentfernen.
Carte "PCB 8 CD" (platine laser)
- Deposerla face arridre.
- Removethe two transport screws - Die beidenTransportschrauben - Enleverlesdeux vis de transfertdu
for CD as well as the two screws fur den CD-Teilsowie die beiden C D ai nsique l esdeux vi s
holdingt he me ta l re a r p l a te . S c h rauben, di e di e R uckpl atteaus mai ntenantl a pl aquemetallique
- Loosenthe spring-loadedpins, Metall festhalten,entfernen. arri dre.
and push upwardsand out of the - Federzapfenlosenund - Enfoncerlesergotselastiqueset
holder (watch out for the flat a n s c hl i eB end
nachoben und aus repousserla cartevers le haut pour
c ablet o t he CD d ri v e m e c h a n i s m). d e r H al terungherausdrucken (auf la sortir de son support (farc
d a sFl achkabel fur dasC D - attention au c6bleen nappe reli6
Laufwerkachten!). au m6cani sme d' entrai nementdu
PCB9 Gear sensor qD .
SeeGearbox.
PCB 9 Getriebefiihler (Gear Carte "PCB 9 Gear sensor"
Sensor) (capteur de pignonnerie)
PCB10 Mains S i e h eh ierzuGetri ebe. V oi r pi gnonneri e.
- Removethe rear panel.
- Removethe Tape/Keyboardfront
f r am e. PCB 10 Netzteil (Mains) Carte "PCB 1O Mains" (secteur)
- Rem ov et he pl u g s1 0 P 1 01, 0 P11 - Ruckwandteilentfernen. - Deposerla face arridre.
?) and 10P 12asw e l l a sth e s c re w
h o l d i n gP C B1 0 .
- Tape/Keyboard-Frontrahmen
entfernen.
- Deposerle panneaufrontal
decoratifde la platine-cassettes et
- Removethe five screwsholding - Ste ckverbi ndungen 10P 10,10P 11 du cl avi er.
the transformer. u n d 1 OP 12 sow i edi e S chraube, di e D 6brancherl esfi ches10P 1 0,
- P ullP CB10 bac k w a rd sa n d o u t o f PCB10 festhiilt,abmontieren. 1 0 P 1 1e t 1 0 P 1 2e t e n l e v e rl a v i s
t he pr oduc tby p u l l i n gc a u ti o u s l y - D i e 5 S chrauben, di e den mai ntenantl a carteP C B10 .
at the transformer. Transformator festhalten, - E nl everl es5 vi s mai ntenan tle
a b monti eren. transformateur.
- D u rchvorsi chti ges Zi ehenam - S orti rl a carteP C B10 de l ' appar eil
PCB 11 RE-deckelectronics TransformatorPCB10 nach hinten en extrayantprudemmentle
- Removethe Tape/Keyboardfront a u sd em Gerdtherauszi ehen. transformateur.
frame. b
H
H
- Removethe three screwsholding g

H
the coverplate,and take out the PCB 11 'RE-Deck elektronic' Carte "PCB 11 RE-deck
t ape t r ans portm e c h a n i s m.P C B1 1 - Tape/Keyboard-Frontrahmen electronic"
is locatedat the very top of the entfernen. D6poserle panneaufrontal
tape transportmechanism. D i e 3 S chrauben, di e di e decoratifde la platine-cassettes et
Abdeckplattehalten,entfernen du cl avi er.
und dasTape-Laufwerk E nl everl es3 vi s mai ntenantla

o! PCB12 Oscillator
SeePCB7 Tape.
herausheben.PCB11 sitzt ganz
oben auf dem Tape-Laufwerk.
plaquede protectionet soulever
le m6canismed'entrainementde
la cassette.La carte PCB11 est
l ogeesur l e haut du mecanism e.
PCB 17 Front end PCB 12 Oszillator
SeePCB1 Tuner. S i e h eh i e rzuP C B7 Tape. Carte "PCB 12 Oscillator"
(oscillateur)
V oi r " P C B7 Tape" .
PCB20 Door sensor P C B1 7 ' Front E nd'
SeeCD front frame. S i e h eh i erzuP C B1 Tuner. Carte "PCB 17 Front end"
V oi r " P C B1 Tuner" .

PCB 21 Active antenna PCB 20 Tiirfiihler (Door Sensor) Carte "PCB 2O Door sensor"
Se eHandle. S i e h eh i erzuC D -Frontrahmen. (6metteur-r6cepteur de la porte)
Voir "panneaufrontal decoratifde
l a pl ati nel aser" .
PCB 22 Active filter PCB 21 Aktivantenne (Active
Se eP CB2 A m plif i e r. Antenna) Carte "PCB 21 Active antenna"
S i e h eh i erzuH andgri ff. (antenne active)
V oi r " poi gnee" .

t) PCB 22 Aktivfilter (Active Filter) Carte PCB 22 Active filter (filtre

actif)
Siehehierzu PCB2 Verstdrker
(Amp l i fi er). V oi r " P C B2 A mpl i fi er" .
6-8
DISASSEMBLY

TAPE MECHANISM
Bang
&Olufsen

l
4'O

fc
Mountingof rotationhead
3n Bang
&Olufsen 5-g
DISASSEMBLY
(

Demountingof pinchroller
2

Demountingof carrier

Demountingof CounterBearingplate
BAIIIG& OLUFSE]I
DK - 7600 SIRUER
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