Circuit Description - Kenwood RXD-251 Service Manual

1. Microprocessor : (IC601, LC867224A-5H71)
1-1 Pin description
No. Name
1 CE
2 ENABLE
3 DI
4 DO
5 CLK
6 DATA
7 SQCO
8 SQCK
9 XLAT
10 FOK
11 GND
12 RESET
13 POWER - DOWN
14 SENS
15 VSS
16 X1
17 X2
18 VDD1
19~22 K1~K4
23, 24 GND
25 MODE - SW2
26 MODE - SW1
27 SCOR
28 COUNT
29 REMOTE IN
30 VR +
31 VR -
32 PIC - UP
33 PIC - DOWN
34 DISC - COUNT
35 TURNTABLE - SW
36 TRAY - OPEN
37 TRAY - CLOSE
38 N/C
39 VR - 1
40~51 N/C
52~55 S1 - S4
56 VDD2
57 VSS2
58~79 S5~S26
80~82 BIAS 3~1
83~86 COM - 0~3
87 FM - STEREO
88 SYN REC
89 VSS3

CIRCUIT DESCRIPTION

I/O Description
I LC7218, LC75392 CE out
– No used
I LC7218, LC75392, 74HC4094 data out
O Data output to LC7218
I LC 7218, LC75392, 74HC4094 clock out
O Serial data out to CXD2508Q
I Serial output of SUBQ 80BIT
O Clock output
O Latch output
O Focus OK output
– GND
I Reset signal input
I Power down input
I CXD2508Q sens
– Vss
– Xtal 6.0MHz
– Xtal 6.0MHz
– Vdd
I Key input (K1~K4)
– GND
I Model discrimination (RXD-371S only)
I Model discrimination
I CXD2508Q Sub - code synch detect
O Track number count signal output
I Remote signal input
I VR encoder input A
I VR encoder input B
I Pick - up SW
I Pick - down SW
I Disc counter SW
I Turntable SW
I Tray open SW
I Tray close SW
– No used
O VR step extend out
– No used
O Segment out (1~4)
– Vdd
– Vss
O Segment out (5~26)
– GND
O FL Common 0~3
I FM stereo signal input
I Synchro start input
– Vss
RXD-251/301/351/371S/A3
0, 1 step
Mono
Active
H L
others
Stereo
7