S-FCRW220
S-FCRW720
6
4. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM
4.1 EXTERIOR SECTION
Buff
Buff
Gain Adj
Vref
+6 V
+6 V
-6 V
Vref
Power
IND
OP Amp
MAIN Volume
7
LEVEL DIAGRAM
Buff
(+6dB)
Line
Level
AC120V
60Hz
H. P. F.
L. P. F.
IN
to Photo
Coupler
D101-D104
S5688G
Offset
Cancel
Photo
Coupler
to Power
AMP
Ó
Ó
+
−
[dBv]
0
+8dB
+6dB
+6dB
-1.5
-10
-18.5dBv
50Hz : 120mV
IC 201
NJM2904M
FU1
REK1067(5A)
IC 201
NJM2904M
IC 41
NJM2904M
IC 44
NJM7906FA
IC 43
NJM7806FA
D31-D34
S5688G
+16v
+16v
D201
T11
T12
D33
D31
D32
D34
PC41
TLP621(Y)
JA201
2
5
7
2
1
1
Q201
2SC2412K
OPERATON
ASSY : AWU7761
AMP ASSY
: AWU7760
A
+12.6v
-12.6v
- 6v
+ 6v
+ 6.1v
0 v
B
A
A
B
C
C
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