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Sharp SM-SX1 Service Manual page 13

1-bit amplifier
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OG
DIGITAL INPUT
ANALOG AMP.
ANALOG
INPUT
Q313~Q328
IC308
ANALOG
IC302,IC303,
D304~D308,
Q305~Q307
0
Q801
Q802
Q803
Q311
1bit
Dig+5V
N
Ana+5V
+5V
1
(Digital)
NJM78M05
RELAY/SW/
MICROCOMPUTER
OP AMP. +10V
1BIT UNIT SECTION
FEEDBACK CIRCUIT
LOGIC CIRCUIT
14
6
1
15
5
4
ICA1
22
2
13
7TH ORDER
23
3
10
MODULATION
CONVERSION
17
LSI
20
IX2815AF
PROTECT
OFFSET
DETECTION
IC651
Q651,Q652
Q653,Q654
IC307
NJM4558M
MOTO
DRIVER
Q306
Q307
IC302
DC/DC
6
3
CONVERTER
IC303
TZ0775AF
+12V
1
+5V
IC306
NJM431U
IC304
1
NJM78M12
IC304
+10V
1
NJM78M12
Figure 13 BLOCK DIAGRAM (2/2)
SWITCHING
ICA2
3
QA1~QA8
NAND GATE
6
74AC00F
8
LEVEL SHIFT
ICA3
11
AND GATE
TAC08F
1bit
+22V
RLY303
Q303
R307
G
+22
UNIT501
2
AC/DC
CONVERTER
3
3
2
– 13 –
VRA1~VRA4
FEEDBACK LEVEL
ADJUSTMENT
5
3
QA9,QA10
ICA4~ICA7
POWER
FET DRIVER
6
8
HIP2100
SWITCHING
Q203
Q204
RLY201
RLY202
1bit
1bit
-22V
-12V
IC301
NJM431U
REGULATOR
-22V
UNIT502
AC/DC
CONVERTER
SM-SX1; 4A/125V
SW501
SM-SX1W; T3.15A L 250V
POWER
LINE
FILTER
SM-SX1; AC120V, 60Hz
SM-SX1W; AC110-127/
220-240V,50/60Hz
SM-SX1/SX1W
LPF
Network
L
R
SPEAKER
TERMINAL
F501
SOC501
AC INLET

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