Read Sony BM-21 / BM-23 (serv.man3) Service Manual online
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18
BM-21/23
BM-21/23
• IC Block Diagrams
IC102, IC103 MM3111AWLE
— AUDIO Board —
1
BIAS
3
4
2
8
6
5
7
SHUTDOWN
BYPASS
+IN
-IN
VO2
GND
VDD
VO1
1
ROUT1
CO3
CO4
VCC
2
ROUT2
3
TC
4
ADJ
VCC
OP1
OP2
CO1
CO3
8 VCC
7 CF
6 RIPPLE
5 GND
IC502 MM1210-XFF
FC GND
VCC
VCC
FC
WB
VCC
NC
UOUT
VOUT
WOUT
P-GND
VB
UB
GND
TO
CONTROL
BLOCKS
TO
EACH
BLOCKS
N1
OUT
VSP
IN+
VREF
S/S
COM
OSC
7
5
4
3
1
2
6
8
9
10
11
12
13
14
15
16
18
20
19
STARTING
DETECT
POWER
SUPPLY
BIAS
OSCILLATING
CIRCUIT
SPEED CONTROL
REFERENCE VOLTAGE
REFERENCE
VOLTAGE
CURRENT
DETECT
SPEED
DETECT
WAVEFORM DETECT
COMMUTATION STARTING LOGIC
SOFT SWITCH
PRE DRIVER
+
–
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IC601 LB1979VS-TLM-E
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