Sharp CD-CH1000 Service Manual page 58

CD-CH1000
IC6 VHiTA2147F/-1:Servo Pre Amp. (TA2147F)
13
GVSW
VRO 14
15
FEO
16
FEN
RFRP
17
18
RFRPIN
RFGO 19
20
RFGC
21
AGCIN
RFO 22
RFN 23
24
GND
V
CTRL
GND
20K
20K
15K
10p
20K 50u
12K
12K
20K
BOTTOM
PEAK
40K
20K
30K
3K
3K
PIN
SEL
(APC_SW)
V
APC ON
CC
HiZ
APC ON
APC OFF
(LDO=H)
Figure 58 BLOCK DIAGRAM OF IC
PEAK
40K
20K
20K
40K
1.3V 2K
240K
15p
240K
15p
180K 40p
60k
180K
60k
40p
TEB RFGC
(TE_BAL) (AGC_Gain)
-50% +12dB
0% +6dB
+50% 0dB
– 58 –
12
15K
50K
20µ
11
10p
10
20K
9
50K
8
1K
7
14K
2K
6
x0.5
K
5
x2
x0.5
1
4
x2
80K
3
20K
80K
2
20K
1
GVSW
(CD/RW)
DA
(0dB)
DA
(0dB)
RW
(+12dB)
RFDC
TEO
TEN
TEB
SEL
LDO
MDI
TNI
TPI
FPI
FNI
VCC