Service manual
CD-CH1500H/CD-CH1500W
– 52 –
IC6 VHiTA2147F/-1: Servo Pre Amp. (TA2147F)
1 VCC Input 3.3 V 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.
9 TEB Input Tracking error balance adjustment signal input terminal.
• 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 SBAD 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= 3.3 V: 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 RFIS 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 AGCI 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 1 kΩ
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 52 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
20µ
12K
20K
20K
20K
2K
40K
50K
50K
40K
10p
1.3V
1K
14K
2K
SBAD
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
AGCI
RFO
RFN
GND
RFIS
RFGO
3K
1
2
3
4
56
78
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