Circuit Description - Kenwood CD-425M Service Manual

1. Main Microprocessor : uPD784217GF501
Microprocessor periphery block diagram
IC2
CXD2587Q
CLOCK
(DSP) XLAT
DATA
SCLK
SENS
SYSM
SCOR
SQCO
SQCK
IC13
uPD780232GC CLK
SO
(DOT DRIVER)
SI
STB
TIMER_SW
TIMER PLAY
ON/OFF
SERIAL COMMUNICATION
REMOCOM INPUT
POWER KEY
JOG
DISC SENSOR ON/OFF
LASER ON/OFF
SPINDLE MOTOR ON/OFF
DOOR OPEN/CLOSE
PROTECTION
ANALOG MUTE
2. Key matrix
PORT
VOLTAGE RESISTER
2.9V 5.1K
2.0V 3K
1.2V 2K
0.4V SHORT

CIRCUIT DESCRIPTION

IC6
35 CLOK
36 XLAT
44 DATA
33 SCLK
34 SENS
45 MUTG
46 SCOR
73 SQSI
75 SCK/SQCK
67 SCK_SW
72 SI
74 SO
71 STB
uPD784217GF501
49 SBUSY
50 SDATA
48 REM
47 POWER
60 JOG_2
59 JOG_1
23 PWM
32 LDC
26 MON
70 DOOR_SW
53 PROTECT
10 RMUTE
A/D 0(IC13,22pin) A/D 1(IC13,21pin)
RANDOM
DISPLAY CONFIRM
STOP
PLAY
CD-425M/4260M/4700M/DPF-J6030
S1_SW 56
S2_SW 28
S3_SW 27
D1_SW 58
D2_SW 57
R_CW 24
R_CCW 25
LOAD_SW 55
UNLOAD_SW 54
LOAD_P 31
LOAD_M 30
RESET 43
REG_ON 29
IC RESET 63
84~91
(AD0~AD7)
76~83,92~98
(A0~A14)
RD 5
WR 6
CS 7
REPEAT
DOWN
UP
CD MECHA
S1_SW
S2_SW
S3_SW
DISC_SW1
DISC_SW2
ROTARY+
ROTARY-
LOAD_SW
UNLOAD_SW
LOADM+
LOADM-
RESET INPUT
PERIPHERY IC ON
PERIPHERY IC RESET
IC10
CY62128L-70SC
(SRAM)
OE
WE
CS
3