Kenwood RXD-251, Service Manual

Page: 7 / 37

No. Name I/O Description
Active
H L
1 CE I LC7218, LC75392 CE out
2 ENABLE – No used
3 DI I LC7218, LC75392, 74HC4094 data out
4 DO O Data output to LC7218
5 CLK I LC 7218, LC75392, 74HC4094 clock out
6 DATA O Serial data out to CXD2508Q
7 SQCO I Serial output of SUBQ 80BIT
8 SQCK O Clock output
9 XLAT O Latch output
10 FOK O Focus OK output
11 GND – GND
12 RESET I Reset signal input
13 POWER - DOWN I Power down input
14 SENS I CXD2508Q sens
15 VSS – Vss
16 X1 – Xtal 6.0MHz
17 X2 – Xtal 6.0MHz
18 VDD1 – Vdd
19~22 K1~K4 I Key input (K1~K4)
23, 24 GND – GND
25 MODE - SW2 I Model discrimination (RXD-371S only)
26 MODE - SW1 I Model discrimination
27 SCOR I CXD2508Q Sub - code synch detect
28 COUNT O Track number count signal output
29 REMOTE IN I Remote signal input
30 VR + I VR encoder input A
31 VR - I VR encoder input B
32 PIC - UP I Pick - up SW
33 PIC - DOWN I Pick - down SW
34 DISC - COUNT I Disc counter SW
35 TURNTABLE - SW I Turntable SW
36 TRAY - OPEN I Tray open SW
37 TRAY - CLOSE I Tray close SW
38 N/C – No used
39 VR - 1 O VR step extend out 0, 1 step others
40~51 N/C – No used
52~55 S1 - S4 O Segment out (1~4)
56 VDD2 – Vdd
57 VSS2 – Vss
58~79 S5~S26 O Segment out (5~26)
80~82 BIAS 3~1 – GND
83~86 COM - 0~3 O FL Common 0~3
87 FM - STEREO I FM stereo signal input Mono Stereo
88 SYN REC I Synchro start input
89 VSS3 – Vss
RXD-251/301/351/371S/A3
7
CIRCUIT DESCRIPTION
1. Microprocessor : (IC601, LC867224A-5H71)
1-1 Pin description