Key Matrix; Pin Description Of Microprocessor; Circuit Description - Kenwood RXD-303 Service Manual

RXD-303/353/503/553/653/A33/A53

4-2 Key Matrix

Input Voltage
(V)
0.00 0.23 REV. MODE
0.26 0.75
0.79 1.29 TAPE EQ.
1.33 1.84 OPEN/CLOSE
1.88 2.38 DISC SKIP
2.42 2.93
2.96 3.45
3.49 3.98
4.01 4.52
4.54 4.80 KEY OFF
* The input voltage value : for 4.8[V] in a standard voltage

4-3 Pin Description of Microprocessor

Pin No. Pin Name
1 SLEVEL
2 CE2
3 SD
4 ST
5 PLL CE
6 RDS DATA
7 PLL CLK
8 BYTE
9 CNVSS
10 XCIN
11 XCOUT
12 RST
13 X OUT
14 VSS
15 X IN
16 VCC(BU)
17 NMI
18 REM
19 RDS CLK
20 BLKCK
21 CE2
22 BEEP SOUND
23 PLL DO
24 B EQ
25 REC MUTE
26 R/P
27 NOR
28 MCLK
29 STAT
30 MDATA
31 FL DATA
32 A CrO2
33 FL CLK
34 FL CE
35 FL RST
36 F REC
37 B CrO2
38 A PACK
39 A PLAY
40 B PACK
8

CIRCUIT DESCRIPTION

KEY3 KEY2
Pin94 Pin95
POWER
REC EX. BASS
CD PLAY/ PAUSE
BAND
TAPE B
DISC 3 TAPE A
DISC 2 AUX
DISC 1 STOP
– –
KEY OFF
I/O
I RSD signal level input.
I Backup detection input 2.
I SD detection input.
I Stereo detection input.
O PLL IC chip enable.
I RDS data input.
O PLL IC clock output.
- GND.
- GND.
I Timer clock input(32.768kHz).
O Timer clock output(32.768kHz).
I Reset signal input.
O Main clock output(10MHz).
- GND.
I Main clock input(10MHz).
- u-com power supply(+5.0V).
- Connected to VCC.
I Signal input of remote control.
I RDS clock input.
I Sub code synchronous signal input. L H Interrupt
I Back up detection input.
O Beep sound output.
I PLL IC data input.
O Equalizer control of B deck play back.
O Deck recording mute control.
O Deck recording/playback changeover control.
O B deck Normal/CrO2 changeover control.
O CD DSP command clock signal output.
I CD DSP status signal input.
O CD DSP command data output.
O Data output to VFD dot driver.
I A deck CrO2 detection switch input.
O Clock output to VFD dot driver.
O Chip enable output toVFD dot driver.
O Reset signal output to VFD dot driver.
I B deck forward recording prohibition detection switch.
I B deck CrO2 detection switch input.
I A deck cassette tape detection switch input.
I A deck head position detection switch input.
I B deck cassette tape detection switch input.
KEY1
Pin97
DISPLAY/DEMO
TUNING MODE
MENU
SOUND
SELECT
BACK
ENTER
–
KEY OFF
Description
ACTIVE
H L
AC ON AC OFF
NORMAL RESET
AC ON AC OFF
MUTE ON
RECORDING PLAY
NORMAL CrO2
NORMAL CrO2
CrO2 Normal