Sony ICF-C470 / ICF-C470L Service Manual ▷ View online
ICF-C470/C470L
– 9 –
– 10 –
SECTION 6
DIAGRAMS
6-1.
BLOCK DIAGRAM
13
10
15
18
11
6
8
FM
FRONT-END
FM
IF AMP
AF
POWER AMP
AM IF AMP,
AGC, DET
AM
FRONT-END
17
20
FM RF
IN
IN
FM/AM
FE OUT
CF2
10.7MHz
CF1
455kHz
CF3
10.7MHz
FM
RF
RF
FM
IF IN
IF IN
3
FM
DISCRIMINATOR
TUNING METER
FM
DISCRI
DISCRI
28
AF
OUT
SP1
(SPEAKER)
AF
IN
IN
24
25
DET
OUT
AM
IF IN
IF IN
METER
NF
VOL
16
4
5
FM/AM
BAND
SELECT
AM OSC
L4
AM (MW)
OSC
L2
FM OSC
L1
AM FERRITE-ROD
ANTENNA
L1
MW/LW
FERRITE-ROD
ANTENNA
ANT1
FM LEAD
ANTENNA
FM OSC
AM RF
IN
IN
9
REG OUT
VREF
L3
FM RF
FM/AM FRONT-END,
FM/AM IF AMP, DET, AGC, AF AMP
IC1
MODE CONTROL, LED DRIVER
IC2
L1-1
(MW)
L1-2
(LW)
CV1-2
CT1-2
VR1
VOLUME
+
+
CT6
LW FREQUENCY
COVERAGE
CT1-3, L4
AM (MW) FREQUENCY
COVERAGE
CT1-1, L2
FM FREQUENCY
COVERAGE
CV1
TUNING
S4
TIME SET –
S5
TIME SET +
S6
SNOOZE/DATE/
SLEEP OFF
S8
ALARM RESET/OFF
RADIO OFF
S9
SLEEP
RADIO ON
(LOW/HIGH)
POWER BACK UP
FOR CLOCK
FOR CLOCK
S11
CLOCK
S10
ALARM
B
BUZZER
S7
ALARM
A
RADIO
BAND SELECT
SWITCH
Q3, 4
CT1-4, L1
AM TRACKING
CT1-2
FM TRACKING
T1
AM IF
B.P.F.
MUTING
Q1
• SIGNAL PATH
• Abbreviation
E13: 220 – 230 V AC 50/60Hz
area in E model
E92: 120 V AC area in E model
: FM
: AM (MW/LW)
05
AC IN
IC1 B+
ALM-B OUTPUT
24
ALM-A OUTPUT
23
RADIO OUTPUT
22
D1
IC2 B+
RECT
D2, 3
D2, 3
RIPPLE FILTER
Q2
SWITCH
Q5
T2
POWER
TRANSFORMER
RECT
D4, 6
D4, 6
DIMMER CONTROL
SWITCH
S2
(C470)
(C470L)
(C470)
CT1-4, L1-1
MW TRACKING
S1
BAND
S1
BAND
S3
BUZZER VOLUME
CT5, L1-2
LW
TRACKING
CV1-4
CT1-4
CV1-4
CT1-4
S1-2
CT5
VREF
CT6
S1-1
CV1-3
CT1-3
CV1-1
CT1-1
FM
MW
LW
CV1
TUNING
CV1
TUNING
CV1
TUNING
CR OSC
Q6
SWITCHING
(C470: Australian/C470L: UK)
(C470L)
(C470: E13)
B+
S5
S4
“L”
“H”
19
50/60Hz INPUT 27
FM
AM
S12
FREQUENCY
BRIGHTNESS
60Hz
50Hz
MID
LOW
HIGH
AM/PM
1
10´SHR AG & D
2
10´SHR B & E
3
10´SHR C & HRE
4
HR B & G
5
HR C & D
6
HR A & F
7
10´SMIN A & F
8
10´SMIN B & G
9
10´SMIN C & D
10
10´SMINE MINE
11
MIN B & G
12
MIN C & D
13
MIN A & F
14
COLON
15
ALM INDICA
TOR
16
TIME SET INPUT
20
ALM-A/B DISP & SEL
25
LED1
DATE DISPLAY
S7
S10
“L”
“H”
CAL DISP & SNOOZE
21
S6
S6
“L”
“H”
MANUAL & SLEEP
26
S9
S8
“L”
“H”
“H”
MODE SELECT
28
TIME SET/DIMMER
29
S11
(EXCEPT C470: US, Canadian, E13, E92)
C470: AEP, Italian, Singapore/
C470L: AEP
C470L: AEP
(C470: US, Canadian, E13, E92)
C470: US, Canadian, E92/
C470L
C470L
(C470: US, Canadian, E92)
EXCEPT C470: US,
Canadian, E92/C470L
Canadian, E92/C470L
DRY BATTERY
6F22
(IEC DESIGNATION 6F22)
1PCS. 9V
ICF-C470/C470L
– 13 –
– 14 –
6-3.
SCHEMATIC DIAGRAM (ICF-C470)
•
See page 19 for IC Block Diagrams.
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
¢
: internal component.
•
2
: nonflammable resistor.
•
C
: panel designation
•
U
: B+ Line.
•
H
: adjustment for repair.
• Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : FM
(
no mark : FM
(
) : AM
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Signal path.
F
: FM
f
: AM
• Abbreviation
AUS
: Australian model
CND : Canadian model
E13
E13
: 220 - 230 V AC 50/60 Hz area in E model
E92
: 120 V AC area in E model
IT
: Italian model
SP
: Singapore model
Note:
The components identi-
fied by mark
The components identi-
fied by mark
!
or dotted
line with mark
!
are criti-
cal for safety.
Replace only with part
number specified.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque
Les composants identifiés par
une marque
!
sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
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