Read Sony ICF-CD73 / ICF-CD73V Service Manual online
ICF-CD73/CD73V
20
20
6-4.
BLOCK DIAGRAM – MAIN Section –
: CD PLAY
: TUNER (FM/AM)
76
RESET
32
R ON
31
POWER ON
SYSTEM CONTROLLER
IC401 (2/2)
B+ SWITCH
Q302, 303
DRY BATTERY
SIZE “C”
(IEC DESIGNATION R14)
4PCS. 6V
+3.3V
REGULATOR
IC403
RESET SIGNAL
GENERATOR
IC402
DC IN 6V
J901
–
+
PVCC
UCOM B+
POWER
AMP B+
VT B+
41
AC IN
AUDIO
CIRCUIT
B+
R-CH
LINE AMP
Q153
D101
• R-ch is omitted due to same as L-ch.
• SIGNAL PATH
R-CH
R-CH
R-CH
MUTING
Q101
LINE AMP
Q152
TU LCH
B
ICF-CD73
(Page 18)
(Page 18)
CD LCH
A
(Page 17)
R DATA
R CLK
R CLK
R CE
COUNT
66
65
64
63
ICF-CD73
(Page 18)
(Page 18)
C
MUTE
62
SEG0 – SEG17
LIQUID CRYSTAL DISPLAY
LCD401
10 – 27
COM0 – COM3
6 – 9
PLL DATA
PLL CLK
PLL CLK
PLL CE
COUNT
MUTE
MUTE
A MUTE
78 79
+
+
POWER AMP
IC303
7
1
BUZZER
52
PLL DATA, PLL CLK,
PLL CE, COUNT, MUTE
PLL CE, COUNT, MUTE
WAKE UP
SWITCH
Q401
KEY 2
S607 – 611
44
KEY 1
S601 – 606
45
KEY0
S501 – 503
46
KEY CHK
51
70
71
X401
32.768kHz
74
75
X402
4.19MHz
XT1
XT2
X1
X2
D308
D401
DC MIDDLE VOLTAGE
CONTROL SWITCH
Q405
AGC
Q154
AGC CONTROL
SWITCH
Q301
D309
FILTER AMP
Q151
RV601
VOLUME
MUTING
CONTROL SWITCH
Q403
LIN
LOUT
+
R-CH
SP101
(L-CH)
(L-CH)
SP201
(R-CH)
+6V
REGULATOR
Q301, 306, 307
42
VM
80
BATT CHK M
49
DC CHK
LOAD
43
VH
DC/DC
CONVERTER
Q304, 305, T301
+3.3V
REGULATOR
IC301
D402
LOAD CONTROL
SWITCH
Q406
77
ICF-CD73V
(Page 19)
ICF-CD73V
(Page 19)
B MUTE
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