Circuit Description - Kenwood RXD-655 Service Manual

RXD-655/755
1. Port Description of Microprocessor
Port No. Port Name
1 VDD
2 -20dB ATT
3 NO USE/DSA STB
4 T BIAS
5 T T1/T2
6 REC/PLAY
7 RES OUT
8 DRF
9 WRQ
10 REQUEST
11 X2
12 X1
13 VPP/IC
14 XT2
15 SPN
16 VDD
17 CD CLK
18 CD DI
19 CD DO
20 CD CE
21 CE
22 CLK
23 DI
24 DO
25 AVSS
26 O/C SW/DSA DATA
NO USE/DSA ACK
27
/TUN SM
28 SPEANA 2
29 SPEANA 1
30 SPEANA 0
31~33 KEY2~KEY0
34 AVDD
35 AVREF
36 P IN
37,38 JOG1,0
39 REMOCON
40 VSS
41 SMUTE
42 T SOL B
43 T SOL A
44 T MOTOR
45 TIMER LED
46 VDD
47 AC RLY CONT.
48 SP RLY
49 SP DET
50 T1 RUN
51 T2 RUN
52 CD CLAMP SW
53 PLAY SW A
54 PLAY SW B
55 FPA
10

CIRCUIT DESCRIPTION

I/O
- POWER SUPPLY(+5V)
O -20dB ATTENUATION
- GND
O DECK BIAS CONTROL
O DECK T1/T2 CHANGE OVER
O DECK RECORDING/PLAYBACK CHANGE OVER
O CD DSP REQUEST
I CDRF LEVEL DETECTION
I CD DSP WRITE REQUEST
I RESET SIGNAL INPUT
O MAIN CLOCK OUTPUT
I MAIN CLOCK INPUT
- GND
- OPEN
- OPEN
- POWER SUPPLY(+5V)
O CD DSP CLOCK
O CD DSP COMMAND
I CD DSP CODE Q INPUT
O CD DSP CE OUTPUT
O CHIP ENABLE OUTPUT
O CLOCK OUTPUT
O DATA OUTPUT
I DATA INPUT
- GND
I CD OPEN CLOSE SWITCH INPUT
I TUNER SIGNAL METER INPUT
I SPEANA DATA INPUT(16kHz)
I SPEANA DATA INPUT(1kHz)
I SPEANA DATA INPUT(63kHz)
I KEY INPUT
- ANALOG POWER SUPPLY
- ANALOG REFERENCE VOLTAGE
I POWER FAILURE DETECTION
I JOG VOLUME INPUT 1, 0
I REMOTE CONTROL SIGNAL INPUT
- GND
O SYSTEM MUTE CONTROL
O DECK2 SOLENOID CONTROL
O DECK1 SOLENOID CONTROL
O DECK MOTOR CONTROL
O TIMER LED CONTROL
- POWER SUPPLY(+5V)
O AC RELAY CONTROL
O SPEAKER OUTPUT RELAY CONTROL
I SPEAKER OUTPUT DETECTION
I DECK1 REEL SENSOR DETECTION PORT
I DECK2 REEL SENSOR DETECTION PORT
I CD CHANGER CLAMP SWITCH INPUT
I DECK PLAY SWITCH A INPUT
I DECK PLAY SWITCH B INPUT
I DECK FORWARD RECORDING SWITCH INPUT
Function