4
KRC-208S/218,268/288,28MR
CIRCUIT DESCRIPTION
(X14-) IC1 :
µ
-COM
PORT No.
PORT NAME
I/O
FUNCTION
OPERATING CONDITION
1
XIN
I
µ
-com clock. (4.5MHz)
-
2
GND
-
GND.
-
3
L DATA L
I
LCD driver data.
-
4
L DATA S
O
LCD driver data.
-
5
L CLK
O
LCD driver clock.
-
6
L CE
O
LCD driver chip enable.
-
7
SDA
I/O E-volume data.
-
8
PLL DATA
I/O Tuner data.
-
9
PLL CLK
O
Tuner clock.
-
10
SD
I
Tuner signal detection.
"H" : Tuner signal exists.
"L" : Tuner signal does not exist.
11
DATA C
I
Changer data.
-
12
DATA H
O
Head unit data.
-
13
CH CLK
I/O Changer clock.
-
14
-
-
No connection.
-
15
MOTOR
O
Mechanism motor.
-
16
SCL
O
E-volume clock.
-
17-24
-
-
No connection.
-
25
AM+B
O
AM power supply.
-
26
FM+B
O
FM power supply.
-
27
PACK IN
I
Cassette tape pack-in.
"L" : Pack in. "H" : Ejection.
28
FF/REW
I
FF/REW signal.
"L" : FF/REW. "H" : Play.
29,30
GND
-
GND.
-
31
VDD
-
VDD.
-
32
REQ C
I
Request from changer.
-
33
MUTE
O
Mute.
-
34
CH CON
O
Changer control.
-
35
REQ H
O
Request to head unit.
-
36
SVR
O
Power IC (IC4) discharge control.
-
37
AMP STBY
O
Power IC (IC4) stand-by.
-
38
AMP MUTE
O
Power IC (IC4) mute.
-
39
P CON
O
P.CON for external amplifier.
-
40
ANT. CON
O
Power antenna.
-
41
SW5
O
Circumambient circuit power supply control.
-
42
ILL
O
Illumination.
-
43
-
-
No connection.
-
44
BEEP
O
Buzzer. (2KHz)
-
45-47
-
-
No connection.
-
48
ROLL OFF
I
Destination switch.
-
49
N.CAN
I
Destination switch.
-
50
SEL1
I
Destination switch.
-
51
SEL2
I
Destination switch.
-
52
-
-
No connection.
-
53
EQ MUTE
O
Tape equalizer mute.
-
54
FWD/REV
I
FWD/REV.
-
55
-
-
No connection.
-
56
REMO
I
Remote control.
-
57-60
-
-
No connection.
-
61
ACC DET
I
ACC detection.
-
62
BU DET
I
Back-up detection.
-
63
S METER
I
Tuner signal meter.
-
64
PANEL
I
Panel on/off.
"L" : Panel on. "H" : Panel off.
65,66
GND
-
GND.
-
67
HOLD
I
Clock stop.
-
68
VDD
-
VDD.
-
69,70
GND
-
GND.
-
71,72
-
-
No connection.
-
73
VDD
-
VDD.
-
74,75
GND
-
GND.
-
76
VSS
-
GND.
-
77,78
-
-
No connection.
-
79
GND
-
GND.
-
80
XOUT
O
µ
-com clock. (4.5MHz)
-
