Read Sharp CD-CH1000 (serv.man20) Service Manual online
CD-CH1000H/CD-CH1000W
– 64 –
IC6 VHiTA2147F/-1:Servo Pre Amp. (TA2147F)
1
VCC
—
3.3V power supply terminal
2
FNI
Input
Main beam amp input terminal
3
FPI
Input
Main beam amp input terminal
4
TPI
Input
Sub-beam amp input terminal
5
TNI
Input
Sub-beam amp input terminal
6
MDI
Input
Monitor photodiode amplifier input terminal
7
LDO
Output
Laser diode amp output terminal
8
SEL
Input
APC circuit ON/OFF signal, LDO terminal control input terminal and bottom/peak
detection frequency switching terminal
detection frequency switching terminal
9
TEBC
Input
Tracking error balance adjustment signal input terminal
• TEBC input voltage
• TEBC input voltage
10
TEN
Input
Tracking error signal generation amp antiphase input terminal
11
TEO
Output
Tracking error signal generation amp output terminal
12
RFDC
Output
RF signal peak detection output terminal
13
GVSW
Input
AGC, FE, TE amp gain switching terminal
14
VRO
Output
Reference voltage (VRO) output terminal • VCC=3.3V: VRO=1/2 VCC
15
FEO
Output
Focus error signal generation amp output terminal
16
FEN
Input
Focus error signal generation amp antiphase input terminal
17
RFRP
Output
Signal generation amp output terminal for track count
18
RFRPIN
Input
Signal generation amp input terminal for track count
19
RFGO
Output
RF signal amplitude adjustment amp output terminal
20
RFGC
Input
RF amplitude adjustment control signal input terminal • RFGC input voltage
21
AGCIN
Input
RF signal amplitude adjustment amp input terminal
22
RFO
Output
RF signal generation amp output terminal
23
RFN
Input
RF signal generation amp input terminal
24
GND
—
GND terminal
Terminal Name
Pin No.
Input/Output
Function
GND
OFF
Connection to VCC via 1k
Ω
Hi-z
ON
Control signal output
VCC
ON
Control signal output
SEL
APC circuit
LDO
GND
CD-RW
Hi-z
CD-DA
VCC
CD-CA
GVSW
Mode
Figure 64 BLOCK DIAGRAM OF IC
PIN
SEL
(APC_SW)
TEB
(TE_BAL)
RFGC
(AGC_Gain)
GVSW
(CD/RW)
V
CTRL
V
CC
HiZ
GND
APC ON
APC ON
APC OFF
(LDO=H)
-50%
0%
+50%
+12dB
+6dB
0dB
DA
(0dB)
DA
(0dB)
RW
(+12dB)
GVSW
VRO
FEO
FEN
RFRP
20K
20K
20K
15K
15K
10p
50u
20
µ
12K
20K
20K
20K
2K
40K
50K
50K
40K
10p
1.3V
1K
14K
2K
RFDC
TEO
TEN
TEB
SEL
LDO
MDI
TNI
TPI
FPI
FNI
VCC
80K
80K
20K
20K
240K
15p
240K
15p
180K
40p
40p
60k
60k
180K
40K
20K
30K
3K
20K
12K
RFGC
AGCIN
RFO
RFN
GND
RFRPIN
RFGO
3K
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
BOTTOM
PEAK
PEAK
K
x0.5
x2
x2
x0.5
1
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