Read Sony ICF-CD823 Service Manual online
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5-7. IC PIN FUNCTION DESCRIPTION
• MAIN BOARD IC401 µPD789407AGK (SYSTEM CONTROL/LCD DRIVER)
Pin No.
1
2
3–5
6
7–10
11–26
27
28–30
31
32–34
35–38
39
40
41–45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78–80
I/O
−
O
−
−
−
O
O
−
Ι
−
Ι
Ο
−
−
−
I
I
−
I
I
I
I
O
O
O
O
O
O
O
O
O
O
O
O
O
O
I
O
I
−
−
−
Ο
Ι
−
Ο
Ο
Ο
Ο
Ο
−
−
−
Description
System power supply
LCD bias output
LCD drive power supply
Ground
LCD drive common signal
LCD drive segment signal
Not used
Initialization input
Not used
Key return signal
Key strobe signal
Analog power supply
A/D converter reference voltage
Key return signal
Key return signal
CD lid open/close detection
Analog ground
Sub code sync input
CD SENS2 input
Power failure detection
CD SENS1 input
Buzzer input
Sub code Q 80-bit serial output
CD mute
CK for reading sub code Q 80-bit
CD reset output
Audio muting output
CD ON output
Radio ON output
Radio data output
Radio CLK output
Radio LAT output
Power ON output
Serial clock output 0
Serial clock output 1
Serial reset input
Main system clock output
Main system clock input (4.19 MHz)
Ground
System power supply
Sub system clock output
Sub system clock input (32 kHz)
Normally, not used. (Used for writing)
CD CLK output
CD LAT output
CD data output
Not used.
Pin Name
VDD1
BIAS
VLC0–2
VSS1
COM0–3
COM3–15
NC
VERSION0–2
NC
KR01–3
KS0–3
AVDD
AVREF
KR0–4
KR00
DOOR IN
AVSS
C SCOR
C SENS2
AC IN
C SENS1
BUZZER
C SQSO
C MUT
C SQCK
C RST
AMUT
DC ON
RADIO ON
R DATA
R CLK
R LAT
POWER ON
SHIFT0
SHIFT1
RESET
X2
X1
VSS0
VDD0
XT2
XT1
IC
C CLK
C LAT
C DATA
NC
5-8. IC BLOCK DIAGRAMS
IC1
CXA1238M-T6
IC51
BU2614FS-E2
30
29
4
5
6
7
8
9
10
11
12
13 14 15
3
2
1
28 27
26 25 24 23 22 21
20
19
18
17
16
REG
FM FRONT-END
AM FRONT-END
VCO
MPX REG.
1/2
COUNTER
1/2
COUNTER
PD1
PD2
MUTING
DECODER AMP
MONO/ST
SELECT
RIPPLE
FILTER
AUTOBLEND
BAND PASS
MUTE
TUNING
INDICATOR
FM IF/
DISCRI
AM
IF/DET
GND
PLL LPF2
MPX REG
VCO
FM
DISCRI
MUTE
AM OSC
AFC
FM OSC
REG
FM RF
AM RF IN
FM RF IN
BAND SELECT
AM IF IN
FM IF IN
TUNE IND
GND
VCC
L CH OUT
R CH OUT
ST IND/
VCO CHECK
PILOT DET LPF2
PILOT DET LPF2
PLL LPF1
AGC AFC2
AGC AFC1
RIPPLE
FIL
TER
FM GND
FM/AM
FE OUT
16
15
14
13
12
11
1
2
3
5
6
7
8
4
10
9
PHASE DET
MAIN CTL
PRESCALER
COUNT
IF
I/O CTL REDISTER
OUT PUT CTL
VSS
PDI
VDD1
VDD2
FM IN
AM IN
P2
IF-IN
P1
P0
CD
DA
CK
CE
X IN
X OUT
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