Circuit Description - Kenwood KRC-705 Service Manual

KRC-705/759R/RY/785/805/859C
ICY/R/RYWWY/885W/PS955
Terminal descrip
Pin Name
tions
CIRCUIT DESCRIPTION
Function
Description
Vdd Positive power supply pin
X2
Main clock connection pin
x1
|
Main clock connection pin
Vss
GND pin
XT2 Sub clock connection pin
XT1
Sub clock connection pin
RESET Reset input pin Active : Lo
POO/INTPO
[CH_RST
Changer reset ouptut pin Active : Hi
PO1/INTP4
R_CLK
RDS clock input pin
PO2/INTP2/NMI REQC Changer handshake request pin
Active : Lo
PO3/INTP3 CAS/SRM
C mechanism/SRM mechanicm voltage
selection pin.
C mechanism : Lo, SRM mechanism :
Hi
PO4/INTP4
SUB MOTOR1 |
Sub-motor output pin
4
PO5S/INTP5
SUB_MOTOR2
Sub-motor output pin
POG/INTP6
SUB_MOTOR3 Sub-motor output pin
AVdd
AVrefO
P10/ANIO
P11/ANI1
PI2/ANI2
SRM_SW1
NOISE
AVD analog power supply pin
AVD reference voltage input pin
PHONE detection pin.
1V or less : PHONE, 2.5V or greater :
NAVI MUTE
SRM position detection pin.
FM noise detection pin
P13/ANI3 SMETER FM S meter detection pin
P14/ANI4
ANA X
Spectrum analyzer input pin
[EIN
ANA _Y
Spectrum analyzer input pin
|P16/ANI6
IF_ MODE
K21 IF mode detection pin.
Wide : Hi, Narrow : Lo
P17/ANI7
T MODE
C mechanism mode detection pin
+
'AVss
A/D GND pin
i:P130/ANO0 NC Output open
P131/ANO1
INC
Output open
AVref1
1
D/A reference voltage input pin
P70/RxD2/SI2 DATAC Data line from changer
P71/TxD2/SO2 DATAH Data line to changer
P72/ASCK2
CH_CLK
Changer clock line
P20/RxD1/SI1
L_DATAL
Data line to LCD driver
P21/TxD1/SO1
L_DATAS
Data line to LCD driver
P22/ASCK1
L_CLK
LCD driver clock pin
P23/PCL NC Output open
10
_P24/BUZ
BEEP Beep detection pin
Active : Hi
P25/SI0
PLL_CE
PLL CE pin
P26/SO0
PLL_DATA
PLL data input/output pin