Sharp XL-3000 Service Manual download pdf (Page 48)

XL-3000/3000C

– 48 –

IC801 VHiTA2109F/-1:Servo Pre Amp. (TA2109F)

1 VCC — Power voltage 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 amp input terminal

7 LDO Output Laser diode amp output terminal

8 SEL Input Laser diode control signal input and APC circuit ON/OFF signal input terminal

9 TEB Input Tracking error balance adjustment signal input terminal

To be controlled by 3-value PWM signal. (PWM carrier = 88.2 kHz)

10 2VRO Output Standard voltage (2VR) output terminal. When Vcc = 5V, 2VR = 4.2V.

11 TEN Input Tracking error signal generation amp reversed phase input terminal

12 TEO Output Tracking error signal generation amp output terminal

13 SBAD Output Sub-beam addition signal output terminal

14 FEO Output Focus error signal generation amp output terminal

15 FEN Input Focus error signal generation amp reversed phase input terminal

16 VRO Output Standard voltage (VR) output terminal. When Vcc = 5V, VR = 2.1V.

17 RFRP Output Track count signal generation amp output terminal

18 RFIS Input RFRP detection circuit input terminal

19 RFGO Output RF signal output terminal

20 RFGC Input RF amplitude adjustment control signal input terminal

The amplitude of RF signal can be controlled by using the 3-value PWM signal (PWM

carrier = 88.2 kHz) which is output from the RFGC terminal of TC9432F.

21 AGCI Input RF signal amplitude adjustment amp input terminal

22 RFO Output RF signal generation amp output terminal

23 GND — GND terminal

24 RFN Input RF reversed phase input terminal

Terminal Name

Pin No.

Input/Output

Function

IC801 VHiTA2109F/-1:Servo Pre Amp. (TA2109F)

15kΩ

50kΩ

10kΩ

7.96kΩ

10kΩ

21kΩ 21kΩ

12kΩ

20kΩ

23.5kΩ

12kΩ

1.53kΩ

20kΩ

3.3kΩ

180kΩ

60kΩ

20kΩ

180kΩ

13kΩ

2.12kΩ

680kΩ

1kΩ

47kΩ

1.74kΩ

24kΩ

30kΩ

24kΩ

21kΩ 29kΩ

10kΩ

7.67kΩ

30kΩ

10kΩ

20kΩ

3.3kΩ

20pF

40pF

20pF

40pF

36pF

10pF

PEAK

BOTTOM

re = 130Ω

SW3

SW2

SW1

65µA

50µA

20µA

1213

VCC

FNI

FPI

TPI

TNI

MDI

LDO

SEL

TEB

2VRO

TEN

TEO

RFN

GND

RFO

AGCI

RFGC

RFGO

RFIS

RFRP

VRO

FEN

FEO

SBAD

3 STATE

DET.

I . I

SEL

HiZ

SW1

SW2

LDC

SW3

OFF

OFF OFF

LDC

Figure 48 BLOCK DIAGRAM OF IC

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 63 64

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Sharp XL-3000 Service Manual Page 48

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