Read Sharp SD-EX100H (serv.man18) Service Manual online
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SD-EX100H
IC701 VHiTA2157F/-1: Head AMP. (TA2157F)
94k
Ω
22k
Ω
15pF
240k
Ω
94k
Ω
22k
Ω
40pF
40pF
180k
Ω
180k
Ω
60k
Ω
60k
Ω
3k
Ω
3k
Ω
20k
Ω
20k
Ω
20k
Ω
40k
Ω
40k
Ω
10pF
15pF
13
GVSW
18
RFRPIN
19
RFGO
RFGC
20
21
AGCIN
22
RFO
23
RFN
24
GND
12
RFDC
11
TEO
10
TEN
9
TEBC
8
SEL
7
LDO
6
MDI
5
TNI
4
TPI
3
FPI
2
FNI
1
VCC
20k
Ω
20k
Ω
15k
Ω
2k
Ω
1.75k
Ω
14k
Ω
1k
Ω
50k
Ω
2k
Ω
1.3V
20k
Ω
12k
Ω
12k
Ω
20k
Ω
40k
Ω
50k
Ω
15k
Ω
30k
Ω
20k
Ω
240k
Ω
10pF
14
VRO
15
FEO
16
FEN
17
RFRP
BOTTOM
PEAK
PEAK
x0.5
x2
K
x0.5
x2
1
50uA
40uA
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 69 BLOCK DIAGRAM OF IC
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