Kenwood AR-404 Service Manual page 5

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4.2 Microprocessor pin descriptions: X09,IC51
Pin No. Pin name
1,2 G9,G10
3
4 RDS,CK
5 RDS,DT
6
7 VOL.ENC.A
8 REMOCON
9 VOL.ENC.B
10,11
12~14 KR0~KR2
15 PROTECT
16 S.DATA
17 S.BUSY
18 E2.DATA
19 E2.CLK
20 SEL.ENC2 CW
21 SEL.ENC2 CCW2
22 MLT. ENC3 CW3
23 MLT. ENC3 CCW3
24
25~27
28 AV REF
29 S.LEVEL
30~32
33 PLL.DO
34 PLL.STEREO
35 PLL.SD
36 RCV.CE
37 AVSS
38 RESET
39 EXTAL
40 XTAL
41
42
43
44
45 VFDP
46 SEL.STB
47 SEL/PLL.DT
48 SEL/PLL.CK
49 PLL.CE
50 T.MUTE
51 A.MUTE
52
53 10dB.ATT
54 VOL.DT
55 VOL.CK
56 VOL.STB
57~59
60 RELAY.A
61 RELAY.B
62,63
64 POWER.RLY
65 STANDBY.LED
66~71
72 LIMITER
73 S.W MUTE
74,75 KS6/KS7
76~81 P1/KS5~P6/KS0
82~88 P7~P13
89
90~92 P14~P16
93~100 G1~G8
CIRCUIT DESCRIPTION
I/O
O FL grid control (9,10).
NC - u-Com +5V power supply.
I RDS IC clock input control. (E type only)
I RDS IC data input control. (E type only)
NC I u-Com +5V power supply.
I Volume encoder A (CW) signal.
I Remote control signal input.
I Volume encoder B (CCW) signal.
NC - Unused.
I Key return (0~2).
I Protection detection signal input.
I/O Serial communication data.
I/O Serial communication busy.
I/O E2 PROM data.
O E2 PROM clock.
I Selector encoder A(CW) input.
I Selector encoder B(CCW) input.
I Multi control encoder A(CW).
I Multi control encoder B(CCW).
8/16 I Serial communication 8bit/16bit changeover.
NC - Unused.
- Analog reference voltage (+5V).
I Signal level A/D input. (E type only)
NC - Unused.
I PLL IC DO signal input. (E type only)
I TUNER stereo signal input.
I TUNER SD signal input.
I Receiver chip enable signal input.
- Analog ground.
I u-Com reset.
I Main clock(8MHZ).
- Main clock(8MHZ).
VSS - u-Com ground.
TX - Unused.
TEX I Ground.
VDD - Analog power supply (+5V).
- FL power supply(-33V).
O TC9164AF strobe.
O Selector/PLL IC data signal output.
O Selector/PLL IC clock signal output.
O PLL IC CE signal output.
O Tuner mute control.
O Audio mute control.
NC - Unused.
O Volume 10dB attenuator control.
O Volume IC(M62492FP) data control.
O Volume IC(M62492FP) clock control.
O Volume IC(M62492FP) strobe control.
NC - Unused.
O SP. relay A control.
O SP. relay B control.
NC - Unused.
O Power relay control.
O STANDBY LED control.
NC - Unused.
O Output power control at SP. (A+B). K/M/X only.
- Unused.
O Key scan 6,7.
O FL segment 1~6/key scan 5~0.
O FL segment 7~13.
VDD O u-Com +5V power supply.
O FL segment 14~16.
O FL GRID 1~8.
Digitized in Heiloo Netherlands
AR-404/KRF-A4030/A4030E/A4030-S
Description
12/11/2017
Active
H: Protection ON
L: STEREO
L: TUNED
L: ENABLE
H: LATCH
L: MUTE ON
L: MUTE ON
L: ATT ON
H: RELAY ON
H: RELAY ON
H: RELAY ON
H: LED ON
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