Service manual

32
HCD-EH10
PANEL BOARD IC701 MB90802-107 (SYSTEM CONTROLLER)
Pin No. Pin Name I/O Description
1
P24
O
Main power on/off control signal output terminal "H": on
2 P25 O
Standby control signal output to the power amplifier and system reset signal output to the CD DSP
3
P26
-
Not used
4
P27
O
Serial data output to the electrical volume
5
SO3 O MP3 serial data output to the CD DSP
6
SC3 O MP3 serial data transfer clock signal output to the CD DSP
7
SI3 I MP3 serial data input terminal
8
TMCK O CD serial data latch pulse signa output to the CD DSP
9 IC0 I
Remote control signal input from the remote control receiver
10
IC1 O MP3 serial data latch pulse signal output to the CD DSP
11
OCU0 O System reset signal output to the motor/coil driver
12
OCU1 O MP3 data request signal output to the CD DSP
13
X0A I Sub system clock input terminal (32.768 kHz)
14
X1A O Sub system clock output terminal (32.768 kHz)
15 VCC -
Power supply terminal (+3.1V)
16
VSS - Ground terminal
17 LED0 O
LED drive signal output terminal for STANDBY indicater
18 to 24 LED1 to LED7 O
Not used
25, 26 TIN0, TIN1 O
Not used
27
TIN2 I RDS serial data input terminal (AEP, East European, Russian models)
28
PPG1 I CD lid open/close detection switch input terminal "L": CD lid close
29
SI0 I Internal status (SENSE) signal input from the CD DSP
30
SC0 O CD serial data transfer clock signal output to the CD DSP
31
SO0 O CD serial data output to the CD DSP
32 AVCC -
Power supply terminal (+3.1V)
33
SI1 I Serial data input from the FM/AM tuner
34
P76 O Oscillator control signal output to the CD DSP
35
AVSS - Ground terminal
36
AN0
I
Power monitor input terminal
37, 38
AN1, AN2 I Front panel key input terminal (A/D input)
39
AN3
I
Auto gain control signal input terminal
40
AN4 I REC switch signal input terminal
41
AN5 I Front panel key input terminal (A/D input)
42 AN6 -
Not used
43
AN7 I Subcode sync (S0+S1) detection signal input from the CD DSP
44
VSS - Ground terminal
45
INT3 I RDS serial data transfer clock signal input terminal (AEP, East European, Russian models)
46 SC1 O
LED drive signal output terminal for liquid crystal display back light
47
SO1 I Model destination setting terminal
48 SI2
I Dial pulse input of the rotary encoder (for VOLUME control)
49
SC2 I MP3 data request signal input from the CD DSP
50
SO2 I MP3 acknowledge signal input from the CD DSP
51 to 53
MD2 to MD0
-
Not used
54 RSTX I
Reset signal input from the reset switch "L": reset
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
55
V0 O Chip enable signal output to the FM/AM tuner
Ver. 1.3