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ICF-CD837
5-2. BLOCK DIAGRAM — MAIN SECTION —
CT4
CV1-4
L4
AM OSC
AM
20
OSC
CT1 CV1-1
L1
AM
FERRITE-ROD
AMRF IN
AM
24
ANTENNA
MIX
VREG
FM
4
MIX
ANT1
MIX
FM
(FM)
OUT
RF
IN
BPF1
1
FM
OSC
CT4,L4
CT1,L1
AM
CF2
AM
FREQUENCY
FM OSC
FM RF OUT
TRACKING
COVERAGE
23
21
CT3,L5
CT2
CT3
CT2,L2
FM
FREQUENCY
FM
TRACKING
COVERAGE
VREG
• Signal path
: CD
: FM
: AM
• R-ch is omitted due to
same as L-ch
• Abbreviation
CND : Canadian model
MX : Mexican model
AUS : Australian model
ICF-CD837
AM
VREG
IC1
FM/AM FRONTEND
IF AMP,DET
ST/MO
FM/AM
AM
IF
T1 AM IFT
IN
CF1
AM
7
DET
DET
AF
OUT
18
17
FM
MPX
IF
IN
VREG
IN
FM
8
DET
CF3
12
QUAD
VREG
19
T1
AM IF
Z PUSH
OPEN/CLOSE
S601
ALARM RESET
/x/OFF
S602
S604
RADIO ON
TIME SET -/.
S603
S605
CD/u
SLEEP
S653
CLOCK
SET/
TRACK
S607
S608
S609
ALARM
NAP
TIME SET +/>
SET A
S612
ALARM MODE A
BUZZER RADIO CD OFF
S651
CD PLAY MODE
S611
ALARM MODE B
BUZZER RADIO CD OFF
D681
CD/RADIO
Q682
D682
LED
NAP
DRIVE
S1
BAND
CD-L
FM
A
CD SECTION
(Page 17)
CD-R
R-CH
16
LPF2
Q102
MIX AMP
Q101,102
LOUT
14
IC401 (2/2)
DECODE
SYSTEM CONTROL
13
R-CH
ROUT
A MUT
59
BUZZER
52
POWER ON
60
SEG0
38-30
I
68-64
SEG12
S401
40
CD OPEN
63
SEG13
SEG14
62
42
KEY1
50/60Hz
51
75
X2
X402
S606
4.19MHz
SNOOZE/
74 X1
SLEEP OFF
KEY0
43
76
S610
RESET
ALARM
71
XT2
SET B
X401
32KHz
70 XT1
44
SW2
AC IN
49
46
SW0
RADIO ON
77
45
SW1
79
CD/RADIO
80
NAP LED
CD ON
78
Q681
LED
DRIVE
18
18
IC301
POWER AMP
VR301
VOLUME
7
11
LIN
LOUT
Q104
STBY
1
R-CH
Q301
MUTE
DRIVE
+3.3V
BRIGHTNESS
RV601
CONTROL
BRIGHTNESS
Q402
LED
1
14
DRIVER
I
Q501-513
13
Q515
17 SEG15
Q514
14 SEG14
Q401
TIME CLOCK
15
DETECT
16
IC402
D401
RESET
+3.9V
3
1
+3.9V
Q1
Q905
Q904
Q901
Q902,903
+B
RIPPLE
+3.9V
+6V
VOLTAGE
VREF
SWITCH
FILTER
REG
REG
CHECK
+6V
+11V
+B
CD+B
SWITCH
Q551
+3.3V
SP101
SPEAKER
(L-CH)
SP201
SPEAKER
(R-CH)
SEG1
I
SEG13
LED501
LED INDICATOR
UNIT
COM1
COM2
T901
AC IN
US,MX
D901
JW901
D902
F901
CND,AUS
D903-906
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