Sony ICF-CD523 Service Manual page 30

ICFCD523
Ver. 1.1
• IC Pin Function Description
MAIN BOARD IC401 uPD789406AGC-044-8BT-A (SYSTEM CONTROLLER)
Pin No. Pin Name
1
VDD1
2
BIAS
3 to 5
VLC0 to VLC2
6
VSS1
7 to 10
COM0 to COM3
11 to 26
SEG0 to SEG15
27 to 30 SEG16 to SEG19
31
NC
32
B MUT
33
C RST
34
KS4
35 to 38
KS0 to KS3
39 AVDD
40
AVREF
41
VERSION0
42
VERSION1
43 CLOSE SW
44
OPEN SW
45
C SENS2
46
C SENS1
47 C SQSO
48
AVSS
49
SCOR
50
C MUT
51 C SQCK
52
AC IN
53
BUZZER
54
C CLK
55 C LAT
56
C DATA
57
M MUT
58 AMUT
59
CD ON
60
RADIO ON
61
R DATA
62
R CLK
63
R LAT
64
POWER ON
65
SHIFT0
66 SHIFT1
67
RESET
68
X2
69
X1
30
I/O
- Power supply terminal (+5V)
O Bias output for the liquid crystal display drive
- Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
- Ground terminal
O Common drive signal output to the liquid crystal display
O Segment drive signal output to the liquid crystal display
O Segment drive signal output terminal Not used
- Not used
O Buzzer sound muting on/off control signal output terminal Not used
O System reset signal output to the RF amplifier and digital signal processor "L": reset
O Key strobe signal output to the key matrix
O Key strobe signal output to the key matrix
- Power supply terminal (+5V) (for A/D converter)
- Reference voltage (+5V) terminal (for A/D converter)
I Destination setting terminal "L": US and Canadian models, "H": AEP model
I Destination setting terminal Fixed at "L" in this set
I Disc tray close detection switch input terminal "H": disc tray is closed
I Disc tray open detection switch input terminal "H": disc tray is opened
I Internal status signal (sense signal) input from the RF amplifier
I Internal status signal (sense signal) input from the digital signal processor
I Subcode Q data (80 bit serial) input from the digital signal processor
- Ground terminal (for A/D converter)
I Subcode sync (S0+S1) detection signal input from the digital signal processor
O Digital muting on/off control signal output to the digital signal processor "H": muting on
O Subcode Q data (80 bit serial) reading clock signal output to the digital signal processor
I Power failure detection input terminal "L": power failure, "H": power on
O Buzzer sound drive signal output terminal
O Serial data transfer clock signal output to the digital signal processor
O Serial data latch pulse signal output to the digital signal processor
O Serial data output to the digital signal processor
O Muting on/off control signal output terminal Not used
At initial mode: Setting terminal for the test mode (CD manual mode) "L" CD manual mode
I/O
At normal mode: Audio muting on/off control signal output terminal "L": muting on
At initial mode: Setting terminal for the test mode (CD auto mode) "L": CD auto mode
I/O At normal mode: Power on/off control signal output for the CD +5V power supply
"L": CD power on
O Power on/off control signal output for the radio +5V power supply "L": radio power on
O PLL serial data output to the FM/AM PLL
O PLL serial data transfer clock signal output to the FM/AM PLL
O PLL serial data latch pulse signal output to the FM/AM PLL
O Front side speaker on/off control signal output to the power amplifier "H": speaker on
O Shift clock output terminal of the main system clock (4.19 MHz) Not used
O Shift clock output terminal of the main system clock (4.19 MHz) Not used
System reset signal input from the reset signal generator "L": reset
I
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
O Main system clock output terminal (4.19 MHz)
I Main system clock input terminal (4.19 MHz)
Description
Not used