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JVC KD-SX8250 Service Manual page 37

Cd receiver
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3 7 63 1515 0
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
TE
L 13942296513
12
RFDC
13
GVSW
14
VRO
15
FEO
16
FEN
17
RFRP
18
RFRPIN
19
RFGO
20
RFGC
www
21
AGCIN
22
RFO
23
RFN
.
24
GND
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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 amp 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.
APC
SEL
circuit
GND
OFF
Hiz
ON
VCC
ON
I
Tracking error balance adjustment signal input pin
Adjusts TE signal balance by ellminating carrier component from PWM
signal (3-state output,PWM carrier = 88.2kHz) output from TC94A14F/FA
TEBC pin using RC-LPF and inputting DC.
TEBC input voltage:GND~VCC
I
Tracking error signal genaration amp negative-phase input pin
O
Tracking error signal generation amp output pin.
Combining TEO signal RFRP signal with TC94A14F/FA configures tracking
search system.
O
RF signal peak detection output pin
I
AGC/FE/TE amp gain change pin
GVSW
Mode
GND
CD-RW
Hiz
Normal
VCC
O
Reference voltage (VRO) output pin
VRO=1/2VCC When VCC=3.3V
O
Focus error signal generation amp output pin
I
Focus error signal generation amp negative-phase input pin
O
Signal amp output pin for track count
Combining RFRP signal and TEO signal with TC94A14F/FA configures
tracking search system.
I
Signal generation amp input pin for track count
O
RF signal amplitude adjustment amp output pin
I
RF amplitude adjustment control signal input pin
Adjusts RF signal amplitude by eliminating carrier component from PWM
signal (3-state output,PWM carrier=88.2kHz)output fromTC94A14F/14FA
RFGC pin using RC-LPF and inputting DC.
RFGC input voltage:GND~VCC
I
RF signal amplitude adjustment amp input pin
x
ao
u163
y
O
RF signal generation amp output pin
I
RF signal generation amp input pin
i
-
GND pin
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2 9
8
Function
LCD
Connected VCC through 1k resistor
Control signal output
Control signal output
Q Q
3
6 7
1 3
1 5
co
.
KD-SX8250/KD-SX780
9 4
2 8
TA2175FN-X
0 5
8
2 9
9 4
2 8
m
9 9
9 9
1-37
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