Bang & Olufsen BeoLab 3500 MKII 1601, Service Manual

Page: 18 / 24

7. Block diagram Block diagram 7. 7.
34
PLUG PCB
POWER AMP. RIGHT
POWER AMP. LEFT
22
22
31
2
31
LF
CROSS FIELD
32
35
DISPLAY, KEYBOARD & IR
MICROCOMPUTER
36
32
2
SMPS
P2-11
P4-14
P24-14
P24-2
RELAY
TR1
PON
P9-10
PMUTE
L-LEV
LCD
CONTRAST
POWER
ON/MUTE
IC4
TR7,8,15
DATA
STROBE
CLOCK
OE
DISPLAY
IC1,2,7
2/4IC6,DP1
ML DATA
TRANSCEIVER
TR9-14,IC8
P9-3
MLTX
MLD-
P9-5
MLD+
P9-4
CLOCK
P9-14
OE
P9-12
DATA
P9-13
P9-6
P2-15
P2-8
P2-9
3
P2-7
P2-17
P2-16
C4 22n
14
1
2
1/4IC1
5V
P1-10
P1-12
P1-1
P1-11
OE
P8-13
CLOCK
P8-12
MLTX
P8-7
DATA
P8-11
STROBE
P8-22
PF
AI
L
P8-2
PLIM
P8-1
0
5V
P8-17
PL ON
P8-3
PL
R
X
P8-4
SDA
P8-8
PL
TX
P8-
5
IRRX
P8-20
MLRX
P8-6
L-LEV
P8-1
GND P8-15
GND P8-16
TIME
R
P8-1
8
MUTE
P8-1
9
STKE
Y
P8-9
P2-12
P1-
5
P2-13
P1-
4
P2-20
P1-14
P1-
8
7
P9-9
TIMER
P9-
8
P9-1
STKE
Y
MUTE
SOFT TOUCH KEYB.
TR3,TR4,2/4IC6
IR RECEIVER
IC3,TR1,2,5,6 IRRX
P9-7
MLRX
P9-2
P9-19
L-LEV
P-MUTE
P9-20
GND
P4-2
P1-22
P2-2
P1-17
P2-19
P1-3
P2-14
P1-18
P5
P4-13
P4-11
P5-8
5V
R6
10K 10K R7
R21 10K
TR6
P1-
21
P1-13
P1-
6
P1-20 P1-19
P1-15
5V
P3-11
VML
8V5 =>15V
PL DATA
TR3,4,5
P3-1
PL D
P5-2
SDA
SCL
P5-3
P3-13
MLD+
MLD-
P3-14
SDA, SCL
3/4IC1
P25-8
P24-13
P25-6
P24-11
P16-6
P16-8
P17-10
P17-8
SOUND CONTROL
IC1
P17-3 P17-2
MLD-
MLD+
PL DATA
V ML
PLIM
P2-6
PFAIL
P2-8
PLIM
P2-6
PFAIL
P2-8
R78,TR8-10 AND
IC2, TR7
R78,TR8-10 AND
IC2, TR7
PL
5
3
7
2
1
4
6
P7-4
V
ML
8V5 =>15V
P7-14
P7-2
P7-1
1
16
MASTER LINK
1A
1A
1A
1A 1A
SCL SDA
10
P1
16
P2-18
STR.
2
31 32
P25-7 P24-12
P16-7 P17-9
P5-9
P2-1
D5
PMUTE
12
PMUTE
P2-7
PMUTE
P2-7
P4
P1