Diagrams; Block Diagram - Sony ICF-C490 Service Manual

ICF-C490
4-1.

BLOCK DIAGRAM

CT1-2, L2
FM TRACKING
L2
FM RF
W7 CT1-2
CV1-2
CV1
FM LEAD
ANTENNA TUNING
10
FM
RF
FM
RF IN
FM
13
FRONT-END
L1
B+ 9 REG OUT
AM FERRITE-ROD
ANTENNA
AM
RF IN AM
11
FRONT-END
CT1-1
CT1-1, L1
AM TRACKING
CV1-1
6
CT1-4, L4
L4
AM FREQUENCY
AM OSC
COVERAGE
CV1
CV1-4
TUNING
1 2 3 4 5 6 7 8 9 10 11 12 13 22
S103 S104
LED101
LED DISPLAY
"L" "M"
S103
TIME SET +
S104
TIME SET FAST +
S105
TIME SET FAST –
SECTION 4

DIAGRAMS

FM/AM FRONT-END,
FM/AM IF AMP, DET, AGC, AF AMP
FM/AM
FM
IF OUT
CF3 IF IN
+
15 18
FM
CF1
DISCRI
3
T1 DISCRIMINATOR
AM IF
AM
CF2 IF IN
AM IF AMP,
17
AGC, DET
FM/AM
BAND
SELECT
8 16
CT1-3, L3
L3
FM FREQUENCY
FM OSC
COVERAGE
CT1-4 CT1-3
CV1-3
MODE CONTROL, LED DRIVER
IC101
23 24 26
IC101 B+ IC101 B+
(Singapore)
S105 S106 S107 S109 S108
"H" "L" "H" "L" "H"
S106 S108
SLEEP
ALARM RESET
RADIO OFF
S109
S107
ALARM RESET SNOOZE
RADIO ON
IC1
DET AF AF
OUT IN OUT
FM AF
+
24 25 28
IF AMP POWER AMP
FM
TUNING METER
METER
20 4 5
S1
MUTING
Q1
BAND
FM
S111
BUZZER VOLUME
AM
QUIET
Q101
NORMAL SWITCHING
LOUD
20 18 19
50/60Hz INPUT 25
SPEED
POWER
17
DOWN
21 27
Q103
SWITCHING
S102-1 S102-2
S102
ALARM TIME/
CLOCK SET
HOLD
RADIO
BUZZER
CLOCK
8 8
• SIGNAL PATH
: FM
: AM
SP1
RV1
VOL
S101-2
ALARM MODE
RADIO+BUZZER
BUZZER
SWITCH
Q102
RADIO
OFF
D104
D108
S101-1
ALARM MODE
D102
D202
ALARM
BUZZER
D103 RADIO+BUZZER
D201
BUZZER
ALARM
RADIO
RADIO
OFF
D305
SWITCH
Q301
S110
BRIGHTNESS
IC1 B+
HIGH
LOW
IC101 B+
POWER BACK UP
FOR CLOCK
DRY BATTERY
6F22
(IEC DESIGNATION 6F22)
1PC. 9V
IC101 B+
T301
RECT
POWER
D302, 303
TRANSFORMER
RIPPLE FILTER
Q2
PC1
(AC IN)
RECT
D106, 107