JVC XL-SV205GD, Service Manual

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1-15
XL-SV205GD
Pin description
Pin No. Pin Name I/O Description
1 AGCVTH - Reference level variable pin for RF level control. The reference level can be varied by the
external resistor.
2 LD O APC amplifier output pin.
3 PD I APC amplifier input pin.
4 PD1 I Inversion input pin for RF I-V amplifiers.
5 PD2 I Connect these pins to the photodiodes A + C and B + D respectively. The current is supplied.
6 V
EE
- //V
EE
pin
7 F I Inversion input pin for F and E I-V amplifiers
8 E I Connect these pins to the photodiodes F and E respectively. The current is supplied.
9 EI - Gain adjustment pin for I-V amplifier.
10 VC O DC voltage output pin of (Vcc + V
EE
)/2. Connect to GND for ±1.75 power supply; connect a
smoothing capacitor for 3.5V Power supply.
11 TE O Tracking error amplifier output pin. E-F signal is output.
12 FE_BIAS I Bias adjustment pin for inverted side of focus error amplifier.
13 FE O Focus error amplifier output pin.
14 FRM I RF amplifier inverted side input pin. RF amplifier gain is determined by the resistor connected
between this pin and RFO pin.
15 RF O O RF amplifier output pin.
16 RF I I The RF amplifier output RFO is input with its capacitance coupled.
17 RFTC - External time-constant pin for RF level control.
18 AGCCONT I RF level control ON (limit level of 50%/30%)/OFF switching pin. OFF for Vcc, 30% for open or Vc
and 50% for V
EE
.
19 LD_ON I APC amplifier ON/OFF switching pin. OFF for Vcc and ON for V
EE
.
20 V c c Vcc pin
Pin configuration
U8: CXA2550N (RF AMPLIFIER)
Block diagram