JVC CH-X1500 Service Manual page 37

• Pin function
QQ
Pin No. Symbol
3 7 63 1515 0
1 VCC
2 FNI
3 FPI
4 TPI
5 TNI
6 MDI
7 LDO
8 SEL
9 TEB
10 TEN
11 TEO
12 RFDC
TE
13 GVSW
L 13942296513
14 VRO
15 FEO
16 FEN
17 RFRP
18 REIS
19 RFGO
20 RFGC
21 AGCIN
22 RFO
23 RFI
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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.
SEL
GND
Hiz
VCC
I Tracking error balance adjustment signal input pin
Adjusts TE signal balance by eliminating 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 generation 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
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
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
O RF signal generation amp output pin
I RF signal generation amp input pin
- GND pin
x ao
y
i
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Function
8
APC
circuit
OFF Connected VCC through 1k resistor
ON
Control signal output
ON Control signal output
Q Q
3 6 7 1 3
GVSW Mode
GND CD-RW
Hiz Normal
VCC
u163
.
2 9 9 4 2 8
LDO
1 5 0 5 8 2 9 9 4
m
co
CH-X1500
9 9
2 8 9 9
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