Circuit Description - Kenwood KRC-478R Service Manual

KRC-478R/RV/RY/RYV
(X14-) IC1 : -COM
PORT
PORT NAME
No.
1 AV CONT
2 IC2 TYPE O
IC2 TYPE 1
3
4 AVSS
MOTOR
5
6 M-STBY
AV REF 1
7
8 ILLUMI
9
L-RESET
10 PANEL
L-DATA L
11
12 L-DATA S
L-CLK
13
14,15 N.C.
CH-DATA C
16
17 CH-DATA H
CH-CLK
18
19 L-CE
SUB+
20
21 SUB-
MS-CONT
22
23 EQ-MUTE
PLL-SCL
24
25 AM+B
FM+B
26
27 N.C.
DSI
28
29
MUSIC
30
FWD/REV
31 R-DATA
R-QUAL
32
33 VSS1
SD
34
35 IC2-SCL
N.C.
36
37 PLL-SDA
IC2-SDA
38
39 MUTE
N.C.
40
4

CIRCUIT DESCRIPTION

I/O FUNCTION
O Analogue reference voltage control.
I Stereo signal data switch.
I Stereo signal data switch.
- Analogue GND.
O Cassette mechanism power supply control.
I
Stand-by signal input from the cassette mechanism.
- 5V power supply for D/A converter reference voltage.
O Illumination power supply control.
O Reset signal output to LCD driver (X13-).
I Panel detection signal input.
I Data input from LCD driver.
O Data output from LCD driver.
O Data clock output from LCD driver.
- -
I Data input from the changer.
O Data output to the changer.
I/O Changer communication clock input and output.
O LCD driver data control.
O Sub motor control signal output.
O Sub motor control signal output.
O No audio signal detection level switch to equalizer amplifier.
O Mute control signal output to equalizer amplifier.
O Communication clock signal output to the front-end.
O Front-end's AM power supply control output.
O Front-end's FM power supply control output.
- -
O DSI's LED on/off switch.
I No audio signal detection level input to equalizer amplifier.
I Tape FWD/REW signal input.
I Data input from RDS decoder.
I Qual input from RDS decoder.
- GND.
I SD signal input from the front-end.
O Clock output to E-volume (IC2).
- -
I/O Data input and output to the front-end.
I/O Data input and output to E-volume (IC2).
O Preout and mute signal output to E-volume (IC2).
- -
OPERATING CONDITION
Active "H".
-
-
-
"H" : Mechanism motor +B "ON".
"L" : Mechanism motor +B "OFF".
"H" when the stand-by signal exists.
"L" when the other signal exists.
-
"H" : Illumi. "ON" or the ALL OFF mode.
"L" : Illumi. "OFF".
"L" : Reset.
"H" : Panel OFF. "L" : Panel ON.
-
-
-
-
-
-
-
Active "H".
-
-
"H" : PLAY. "L" : FF/REW.
"H" : FF/REW or the other source.
"L" : TAPE PLAY.
-
"H" : AM+B "ON".
"H" : FM+B "ON".
-
"H" : LED "ON".
"H" when audio signal does not exist.
"L" when audio signal exists.
"H" : Forward. "L" : Reverse.
-
-
-
"H" when the carrier signal exists.
"L" when the carrier signal does not exist.
-
-
-
-
"H" : Mute "ON". "L" : Mute "OFF".
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