ICF-CDK70 - Sony Audio Service Manual (repair manual). Page 33

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ICF-CDK70
33
•  IC Pin Function Description
MAIN BOARD  IC801 MB90802PF-G-124E1 (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
O-TU-DO
O
Serial data output to the FM/AM PLL
2
O-TU-CE
O
Chip enable signal output to the FM/AM PLL    "L": active
3
I-CD-LIMSW
I
Detection input from the sled limit-in detect switch
The optical pick-up is inner position when "L"
4
I-CD-BUSY
I
Busy signal input from the CD DSP
5
O-CD-DIN
O
Serial data output to the CD DSP
6
O-CD-MCK
O
Serial data transfer clock signal output to the CD DSP
7
I-CD-DOUT
I
Serial data input terminal
8
O-CD-RW
O
Data read/write selection signal output to the CD DSP
9
I-RMC
I
Remote control signal input from the remote control receiver
10
O-POWER CD
O
CD power on/off control signal output terminal    "H": CD power on
11
O-AMP STANDBY
O
Output control signal output to the power amplifi er
12
O-4.5V CE
O
Not used
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 (+3.3V)
16
VSS
-
Ground terminal
17
O-CD-XRST
O
System reset signal output to the CD DSP    "L": reset
18
O-MO2-
O
Motor drive signal (-) output terminal for CAM rotation
19
O-MO2+
O
Motor drive signal (+) output terminal for CAM rotation
20
O-MO1-
O
Motor drive signal (-) output terminal for drawer movable
21
O-MO1+
O
Motor drive signal (+) output terminal for drawer movable
22
O-A MUTE
O
Audio muting on/off control signal output terminal    "H": muting on
23
O-BUZZER
O
Buzzer drive signal output terminal
24
O-BASS BOOST OFF
O
Not used
25
I-TRSW3
I
CD switch (SW3) input terminal
26
I-TRSW1
I
CD switch (SW1) input terminal
27
I-TRSW7
I
CD chuck switch (SW7) input terminal
28
I-TRSW2
I
CD switch (SW2) input terminal
29
I-TRSW6
I
CD close switch (SW6) input terminal
30
I-TRSW5
I
CD stock switch (SW5) input terminal
31
I-TRSW8
I
CD open switch (SW8) input terminal
32
AVCC
-
Power supply terminal (+3.3V) (for A/D converter)
33
O-VOL-DATA
O
Serial data output to the electrical volume
34
O-VOL-CLK
O
Serial data transfer clock signal output to the electrical volume
35
AVSS
-
Ground terminal (for A/D converter)
36
I-REG6.0V-CHK
I
Input terminal for +6V power supply voltage detection
37
I-REG4.5V-CHK
I
Input terminal for +4.5V power supply voltage detection
38 to 40
I-KEY0 to I-KEY2
I
Front panel key input terminal (A/D input)
41
I-REG3.3V-CHK
I
Input terminal for CD +3.3V power supply voltage detection
42
I-AC IN
I
Not used
43
I-CD-SUBSYQ
I
Subcode Q data (80 bit serial) input from the CD DSP
44
VSS
-
Ground terminal
45 to 47
I-SUFFIX 0 to 
I-SUFFIX 2
I
Input terminal for destination discrimination
48
I-BASS BOOST ON/
OFF
I
MEGA BASS switch input terminal    "L": MEGA BASS on, "H": MEGA BASS off
49, 50
I-ENCODER +, 
I-ENCODER -
I
Jog dial pulse input from the rotary encoder (VOLUME)
51 to 53
MD2 to MD0
I
Input terminal for fl ash writing mode setting
54
I-RESET
I
System reset signal input from the reset signal generator    "L": reset
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
55 to 57
O-DISC1KEY LED to 
O-DISC3KEY LED
O
LED drive signal output terminal
58
VLCD
I
Input terminal for liquid crystal display drive voltage setting
59 to 62
COM4 to COM1
O
Common drive signal output to the liquid crystal display
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