Sony XR-3750 Service Manual page 26

• IC Block Diagrams
– MAIN Section –
IC301 CXA2509AQ-T4
30 29 28 27 26 25 24 23 22 21
24dB
120µ/70µ
T2
+ –
– +
NR BIAS MS
PBFB2 31
X1 MODE
32
PBRIN2
TAPE/AUX
33 F2
PBREF2
TAPE EQ
PBFIN2 34
FWD/RVS
VCT 35
VCT
PBGND VCC
36
+ LPF
+
DETECT
–
PBFIN1 37
F3
F1
PBREF1 38
X1
PBRIN1 39
PBFB1 40
T1
120µ/70µ
24dB
1 2 3 4 5 6 7 8 9 10
IC331 LC75373ED
33 32 31 30 29 28 27 26
+
–
+
–
+
–
–
+
LSELO 34
L4 35
L3
36 –
+
L2 37 +
L1 38 –
VDD 39
DECODER
–
R1 40
+
R2 41 +
–
R3 42
R4 43
RSELO 44
+
–
–
+
–
+
–
+
1 2 3 4 5 6 7 8
20 MSMODE
19 DRSW
18
TAPESW
17 INSW
16 NC
15 NC
MS ON/
OFF
14 MSOUT
13 DGND
12 MSTC
11 G1FB
25 24 23
22 LFIN
+
21 LFOUT
–
+
20 LROUT
–
19 VREF
SHIFT
LATCH CONTROL 18 CE
REGISTER
17
DI
16
CL
15 VSS
–
14
RROUT
+
–
RFOUT
13
+
12 RFIN
9 10 11
– 31 –
IC351 MM1322XFBE
GND 1
8 OUT2
7 VS
IN2 2
VCC 3
IN1 4
6
OUT1
5 GND
IC611 BA3918-V2
REGULATOR
OVER VOLTAGE
PROTECT
–
+
1 2 3 4 5 6 7 8 9 10
• Waveform
– MAIN Section –
1 IC501 &¶ (X-IN)
3.2 Vp-p
222 ns
11 12
– 32 –