Sony ICF-CD73 / ICF-CD73V Service Manual ▷ View online
33
ICF-CD73/CD73V
• Waveforms
– CD Board –
– CD Board –
1
IC701
4
(RF) (CD Play mode)
qs
IC2
w;
(XOUT) (ICF-CD73V)
– LCD Board –
wa
IC401
ua
(XT2)
3.1 Vp-p
238.6 ns
2.0 Vp-p
59.1 ns
ws
IC401
ug
(X2) (CD Play mode)
3.2 Vp-p
30.5
µ
s
– POWER Board –
ea
Q304 (Collector) (Tuner Mode)
1.0 Vp-p
13.3
µ
s
1.7 Vp-p
13.3
µ
s
– TUNER Board –
qa
IC2
w;
(XOUT) (ICF-CD73)
460 mVp-p
32.3
µ
s
es
Q305 (Collector) (Tuner Mode)
3.8 Vp-p
32.3
µ
s
2
IC701
rk
(XOUT) (CD Play mode)
1.2 Vp-p
34
ICF-CD73/CD73V
6-16.
IC PIN FUNCTION DESCRIPTION
•
LCD BOARD IC401
µ
PD789477GC-A33-8BT (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1, 2
NC
—
Not used
3 to 5
VLC2 to VLC0
—
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
6 to 9
COM0 to COM3
O
Common drive signal output to the liquid crystal display
10 to 27
SEG17 to SEG0
O
Segment drive signal output to the liquid crystal display
28 to 30
VERSION0 to
VERSION2
I
Setting input terminal for destination
31
POWER ON
O
Power on/off control signal output terminal for the power amplifier
“L”: standby mode, “H”: power amplifier on
“L”: standby mode, “H”: power amplifier on
32
R ON
O
Power on/off control signal output for the tuner section “H”: tuner power on
33 to 37
NC
I
Not used
38
AVDD
—
Power supply terminal (+3.3V) (analog system)
39
FSEQ
I
CD synchronizing signal detection signal input from the digital signal processor
40
NC
I
Not used
41
AC IN
I
Power detection signal input terminal when connected AC power adapter (A/D input)
42
VM
I
Middle voltage (+3V) detection input for battery check
43
VH
I
High voltage (+6V) detection signal input for AC or battery check
44 to 46
KEY2 to KEY0
I
Front and top panel key input terminal (A/D input)
47
AVSS
—
Ground terminal (for analog system)
48
NC
I
Not used
49
DC CHK
I
Power failure detection signal input terminal “L”: power failure, “H”: power on
50
WRQ
I
CD interruption signal input from the digital signal processor
51
KEY CHK
I
Key interruption detection signal input terminal
52
BUZZER
O
Beep sound signal output terminal
53
CD DATA IN
I
Serial data input from the digital signal processor
54
CD DATA
O
Serial data output to the digital signal processor
55
CD CLK
O
Serial data transfer clock signal output to the digital signal processor
56
CD CE
O
Chip enable signal output to the digital signal processor
57
DRF
I
CD focus on/off detection signal input from the digital signal processor
58
XRST
O
System reset signal output to the digital signal processor “L”: reset
59
CD ON
O
Power on/off control signal output for the CD section “H”: CD power on
60
NC
I
Not used
61
CD OPEN
I
CD lid open/close detect switch input terminal “L”: CD lid is closed, “H”: CD lid is opened
62
MUTE
O
Tuner muting on/off control signal output to the FM/AM PLL “L”: muting on
63
COUNT
I
PLL serial count data input terminal from the FM/AM PLL
64
R CLK
O
PLL serial data transfer clock signal output to the FM/AM PLL
65
R DATA
O
PLL serial data output to the FM/AM PLL
66
R CE
O
PLL chip enable signal output to the FM/AM PLL
67, 68
NC
I
Not used
69
IC
—
Ground terminal
70
XT1
I
Sub system clock input terminal (32.768 kHz)
71
XT2
O
Sub system clock output terminal (32.768 kHz)
72
VDD0
—
Power supply terminal (+3.3V)
73
VSS0
—
Ground terminal
74
X1
I
Main system clock input terminal (4.19 MHz)
75
X2
O
Main system clock output terminal (4.19 MHz)
Ver. 1.1
35
ICF-CD73/CD73V
Pin No.
Pin Name
I/O
Description
76
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”
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
77
LOAD
O
Load control signal output terminal for battery reverse insert check
78
A MUTE
O
Audio muting on/off control signal output terminal “L”: muting on
79
B MUTE
O
Muting signal on/off control signal output terminal “L”: muting on (beep sound on)
80
BATT CHK M
O
Middle voltage (+3V) control signal output terminal for battery check
36
ICF-CD73/CD73V
7-1.
OVERALL SECTION
SECTION 7
EXPLODED VIEWS
• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
delay should be anticipated when ordering
these items.
• Accessories are given in the last of the elec-
trical parts list.
• Abbreviation
CND : Canadian model
IT
IT
: Italian model
MX : Mexican model
• Refer to “COLOR VARIATION” in the SER-
VICING NOTES (page 4) about color varia-
tion.
tion.
NOTE:
• -XX and -X mean standardized parts, so they
may have some difference from the original
one.
one.
• Color Indication of Appearance Parts
Example:
KNOB, BALANCE (WHITE) . . . (RED)
KNOB, BALANCE (WHITE) . . . (RED)
↑
↑
Parts Color Cabinet's Color
• Refer to “DISCRIMINATION OF ORIGINAL
AND LIV MODEL” in the SERVICING
NOTES (page 4) about LIV model.
NOTES (page 4) about LIV model.
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
1
3-368-852-01 FOOT
* 2
A-3683-356-A SW BOARD, COMPLETE
3
2-671-591-01 SCREW +BVTP 2.6X8
4
2-671-592-01 SCREW +BVTP 2.6X10
Les composants identifiés par une
marque 0 sont critiquens pour la
sécurité.
Ne les remplacer que par une pièce
portant le numéro spécifié.
marque 0 sont critiquens pour la
sécurité.
Ne les remplacer que par une pièce
portant le numéro spécifié.
The components identified by mark
0 or dotted line with mark 0 are
critical for safety.
Replace only with part number
specified.
critical for safety.
Replace only with part number
specified.
#1
3-254-151-01 SCREW (B2.6) (+) P TAPPING
(CD73V: LIV (WHITE))
#1
7-685-534-14 SCREW +BTP 2.6X8 TYPE2 N-S
(EXCEPT CD73V: LIV (WHITE))
1
1
2
cabinet (upper)
section
section
cabinet (rear) section
cabinet (front)
section
section
not supplied
#1
4
4
4
4
3
chassis (main) section
Ver. 1.2
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