Kenwood RXD-803 Service Manual page 8

RXD-803/803E/853/853E/A83
4-2 Key Matrix
Input Voltage
(V)
0.00 0.26 POWER
0.27 0.81 DISPLAY/DEMO
0.82 1.37 TUNING MODE
1.38 1.94
1.95 2.51 SOUND
2.52 3.07
3.08 3.62 SELECT
3.63 4.16 ENTER
4.17 4.73
4.73 5.00 KEY OFF
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 CE
22 BEEP SOUND
23 PLL DO
24 CS RELAY
25 D XRESET
26 DXLAT
27 AMUTE
28 MCLK
29 STAT
30 MDATA
31 FL DATA
32 HPDET
33 FL CLK
34 FL CE
35 D DATA
36 D READY
37 D.SCK
38 SOLB
39 CPM
40 SOLA
8
CIRCUIT DESCRIPTION
KEY1 KEY2
Pin97 Pin95
EX. BASS
KEY OFF
CD PLAY/ PAUSE
MENU BAND
TAPE B
BACK TAPE A
AUX
STOP
KEY OFF
I/O
I RDS signal level input.
I Backup detection input 2.
I SD detection input.
I Stereo detection input.
O PLL IC & E. volume chip enable.
I RDS data input.
O PLL IC & E. volume 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 Relay control port for center and surround speakers.
O DSP reset port.
O DSP latch output.
O Control port of audio muting.
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 Detection port of headphones.
O Clock output to VFD dot driver.
O Chip enable output toVFD dot driver.
O DSP data output.
I DSP ready signal input.
O DSP clock output port.
O B deck solenoid control.
O Capstan control port for deck.
O A deck solenoid control.
KEY3
Pin94
REV. MODE
REC
TAPE EQ.
OPEN/CLOSE
DISC SKIP
DISC 3
DISC 2
DISC 1
KEY OFF
Description
ACTIVE
H L
AC ON AC OFF
NORMAL RESET
AC ON AC OFF
ON OFF
RESET
NORMAL H/P IN
ON OFF
ON OFF
ON OFF