Circuit Description - Kenwood CD-203 Service Manual

1. Pin description
Pin No. Name
1~7 7G~1G
8 VDD
9 SQCK
10 NC
11 SUBQ
12~15 KR3~KR0
16 NC
17 RESET
18 SLT SW
19 DOWN SW
20 AVSS
21 UP SW
22 CLOSE SW
23 OPEN SW
24 OPEN M
25 CLOSE M
26 RTRAY R
27 RTRAY L
28 RTRAY S
29 AVDD
30 AVREF
31 NC
32 XT2
33 VSS
34 X1
35 X2
36 DSENSE
37 PSENSE
38 LDC
39 FOK
40 D.R.I.V.E
41 SERIAL SW
42 SDATA
43 BUSY
44 SCOR
45 MON
46 MUTG
47 REM
48 VPP
49 SENSE
50 DTA
51 CLK
52 VDD
53,54 DEFECT SEL./NC
55 LAT
56 GFS
57 RMUTE
58 MDT
59 MCK
60 MEL
61~70 Sp~Sg/KS
71 VLOAD
72~77 Sf~Sa/KS
78~80 10G-8G

CIRCUIT DESCRIPTION

I/O
O Display digit control (Grid7~Grid1)
Power supply (+5V)
O Q data reading clock output
O Unused
I Q data input
I Key return 3~0
I Unused
I Reset input
I CDM25 start limit switch input
I CDM25 mechanism down switch input
I Unused (connected to VSS)
I CDM25 mechanism up switch input
I CDM25 close switch input
I CDM25 open switch input
O Open motor control
O Close motor control
O Rotary tray motor control (CW)
O Rotary tray motor control (CCW)
O Rotary tray motor control (deceleration)
Unused (connected to VDD)
Unused (connected to VSS)
I Unused
Unused (OPEN)
GND
I System clock input
Unused
I CDM25 disc sensor detection
I CDM25 position sensor detection
O Laser signal output
I FOK signal input
I Unused
I Serial communication 8 (XS8)/16(SL16) bit changover
I/O System serial data signal input output
I/O System serial busy signal input output
I Sub code frame sync detection
O Focus drug countermeasure circuit control
O Digital mute control
I Remote control signal input
GND
I Sense input from CXD2507AQ
O Data output for CXD2507AQ
O Clock output for CXD2507AQ
Power supply (+5V)
I Unused
O Latch output for CXD2507AQ
I Frame signal input
O Analog mute control
O Attenuater data output
O Attenuater clock output
O Attenuater latch output
O Display segment control (Seg p-Seg g) / Key scan
Display drive negative power supply (-35V)
O Display segment control (Seg f-Seg a) / Key scan
O Display digit control (Grid10-Grid8)
CD-203/204/DPF-R3010/R3010E/R4010/R4010E
Function
L : RESET
L : SW ON
L : SW ON
L : SW ON
L : SW ON
L : SW ON
H : ACTIVE
H : ACTIVE
H : ACTIVE
H : ACTIVE
H : ACTIVE
L : LASER ON
H : FOCUS ON
H : 16 BIT
H : MUTE ON
L : MUTE ON
3