Diagrams; Block Diagram - Sony ICF-C470 Service Manual

6-1.

BLOCK DIAGRAM

L3
FM RF
CV1
ANT1 CV1-2
TUNING
FM LEAD
ANTENNA
B.P.F.
(C470)
L1
CV1
AM FERRITE-ROD
TUNING
ANTENNA
CT1-4
VREF
CT1-4, L1
AM TRACKING
CV1-4
CT1-3, L4
AM (MW) FREQUENCY
(C470L)
COVERAGE
CT1-4, L1-1
L1
S1
MW/LW MW TRACKING
FERRITE-ROD AM (MW)
BAND
CV1
ANTENNA OSC
TUNING
S1-2
L1-1
(MW)
CT6
FM
LW FREQUENCY
CT1-4
COVERAGE
MW
CV1-4
LW
L1-2
(LW)
VREF
CT5, L1-2
CT5 S1-1
LW
TRACKING
BAND SELECT
SWITCH
Q3, 4
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 20
S4 S5
LED1
DATE DISPLAY
"L"
S4
TIME SET –
S5
TIME SET +
05
SECTION 6

DIAGRAMS

CT1-2
FM TRACKING
CT1-2
10
FM
RF
FM RF FM/AM CF2
10.7MHz
IN FE OUT
FM
+
13 15
FRONT-END
T1
AM IF
AM RF
IN AM CF1
11
FRONT-END 455kHz
9 REG OUT
6 8
FM FREQUENCY
L4
COVERAGE
L2
FM OSC
CT1-3 CT1-1
CV1-3 CV1-1
CT6
CV1
TUNING
MODE CONTROL, LED DRIVER
IC2
25 21 29 26
S11
CLOCK
S10 S7 S6 S6 S11 S8 S9
"H" "L" "H" "L" "H" "H" "L" "H"
S10 S6 S8
ALARM B
SNOOZE/DATE/
ALARM RESET/OFF
BUZZER SLEEP OFF RADIO OFF
S7 S9
ALARM A SLEEP
RADIO RADIO ON
(C470: US, Canadian, E13, E92) (EXCEPT C470: US, Canadian, E13, E92)
– 9 –
FM/AM FRONT-END,
FM/AM IF AMP, DET, AGC, AF AMP
IC1
FM DET
IF IN OUT
FM
+
18 24
IF AMP
CF3
FM
10.7MHz
DISCRI
FM
3
DISCRIMINATOR
AM
IF IN
AM IF AMP,
17
AGC, DET
FM/AM TUNING METER
BAND
SELECT METER
16 20
CT1-1, L2
(C470)
S1
BAND
FM
AM
S3
BUZZER VOLUME
HIGH
MID
LOW
24 23 22
50/60Hz INPUT 27
CR OSC 19
28
C470: AEP, Italian, Singapore/
B+
C470L: AEP
(C470: Australian/C470L: UK)
S12
FREQUENCY
60Hz
50Hz
(C470: E13)
AF AF
IN OUT
AF
25 28
SP1
POWER AMP
(SPEAKER)
4 5
VR1
VOLUME
MUTING
Q1
(C470L)
Q6
SWITCHING
C470: US, Canadian, E92/
C470L
POWER BACK UP
FOR CLOCK
D1
SWITCH
Q5
(IEC DESIGNATION 6F22)
EXCEPT C470: US,
Canadian, E92/C470L
(C470: US, Canadian, E92)
RIPPLE FILTER
IC1 B+
RECT
IC2 B+
D4, 6
– 10 –
ICF-C470/C470L
• SIGNAL PATH
: FM
: AM (MW/LW)
• Abbreviation
E13: 220 – 230 V AC 50/60Hz
area in E model
E92: 120 V AC area in E model
DRY BATTERY
6F22
1PCS. 9V
T2
RECT
POWER
D2, 3
TRANSFORMER
Q2
BRIGHTNESS
(LOW/HIGH)
DIMMER CONTROL AC IN
SWITCH
S2