JVC KD-S785 Service Manual page 23

3.Pin function
Pin No. Symbol
1 Vcc
2 FNI
3 FPI
4 TPI
5 TNI
6 MDI
7 LDO
8 SEL
9 TEBC
10 TEN
11 TEO
12 RFDC
13 GVSW
14 VRO
15 FEO
16 FEN
17 RFRP
18 RFRPIN
19 RFGO
20 RFGC
21 AGCIN
22 RFO
23 RFN
24 GND
I/O
- 3.3V Power supply pin
I Main-beam amp input pin
I Main-beam amp input pin
I Sub-beam amp input pin
I Sub-beam input pin
I Monitor photo diode amp input pin
O Laser diode amp output pin
I APC circuit ON/OFF control signal,laser diode (LDO) control signal input or
bottom/peak detection frequency change pin.
SEL
circuit
GND OFF
HIZ
Vcc
I Tracking error balance adjustment signal pin
Adjusts TE signal balance by eliminating carrier component from
PWM signal(3-state output, PWM carrier = 88.2kHz) output from
TC9490F/FA TEBC pin using RC-LPF and inputting DC.
TEBC input voltage:GND~Vcc
I Tracking error signal generation amp negative-phase input pin
O Tracking error signal generation amp output pin.
Combining TEO signal and RFRP signal with TC9490F/FA configures
tracking search system.
O
RF signal peak detection output pin
I
AGC/FE/TE amp gain change pin
GVSW
GND
HIZ
Vcc
Reference voltage (VRO) output pin *VRO = 1/2 Vcc when Vcc = 3.3V
O
Focus error signal generation amp output pin
O
Focus error signal generation amp negative-phase input pin
I
Signal amp output pin for track count
O
Combining RFRP signal TEO signal with TC9490F/FA configures tracking
search system.
Signal generation amp input pin for track count
I
RF signal amplitude adjustment amp output pin
O
RF amplitude adjustment control signal input pin
I
Adjusts RF signal amplitude by eliminating carrier component from PWM
signal (3-state output, PWM carrier = 88.2kHz) output from TC9490F/FA
RFGC pin using RC-LPF and inputting DC.
*RFGC input voltage : GND-Vcc
RF signal amplitude adjustment amp input pin
I
RF signal generation amp output pin
O
RF signal generation amp input pin
I
GND pin
-
Function
APC
LDO
Connected to Vcc
through 1k resistor
Control signal output
ON
Control signal output
ON
Mode
CD-RW
CD-DA
CD-DA
KD-S785
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