Sony ICF-M410S Service Manual ▷ View online
5
ICF-M410S
SECTION 3
ELECTRICAL ADJUSTMENTS
BAND : MW/SW
• Repeat the procedures in each adjustment several times for the
maximum level meter indication.
• The frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
FM SECTION
[Adjustment Location : Main board] (Component side)
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
AM RF signal
generator
generator
0.01
µ
F
FM RF signal
generator
generator
telescopic
antenna
terminal
antenna
terminal
75kHz (100%) amplitude modulation
by 1kHz signal.
Output level : as low as possible
by 1kHz signal.
Output level : as low as possible
16
Ω
set
+
–
level meter
Speaker terminal (EPJ301)
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
621 kHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L17
87.5 MHz
CT3
108 MHz
BAND : FM
MAIN BOARD
1
15
16
30
IC1
(Component side)
L4,CT1
SW TRACKING
adjustment
SW TRACKING
adjustment
L17,CT3
FM TRACKING
adjustment
FM TRACKING
adjustment
T1
AM IF
adjustment
AM IF
adjustment
CT2
MW TRACKING
adjustment
MW TRACKING
adjustment
L11
MW FREQUENCY
COVERAGE
adjustment
MW FREQUENCY
COVERAGE
adjustment
L9
SW FREQUENCY
COVERAGE
adjustment
SW FREQUENCY
COVERAGE
adjustment
MW/SW SECTION
MW/SW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
SW
L4
5,800 kHz
CT1
15,900 kHz
MW
ANT102
621 kHz
CT2
1,404 kHz
MW/SW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
SW
L9
5,800 kHz
MW
L11
531 kHz
6
ICF-M410S
SECTION 4
DIAGRAMS
Note on Schematic Diagram:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. p: pF.
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.
•
f
: internal component.
•
C
: panel designation.
•
A
: B+ Line.
•
H
: adjustment for repair.
• Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : FM
no mark : FM
∗
: Impossible to measure
• 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 (SW)
The components identified by mark
0
or dotted line with mark
0
are critical for
safety.
• Waveform
2Vp-p
1
IC101
wf
(XOUT)
1.4V
Note on Printed Wiring Board:
• X
: parts extracted from the component side.
•
: Pattern from the side which enables seeing.
7
7
ICF-M410S
4-1. BLOCK DIAGRAM
: FM
B.P.F
D2
Q10
1
3
BPF1
Q1
SW RF AMP
Q4
MW RF AMP
Q2
Q5
Q6
Q7
Q3
INVERTER
Q8
BUFFER
Q9
BUFFER
L4 SW RF
ANT102
(FERRITE-ROD)
13
10
8
FM RF IN
FM RF
FM OSC
AM RF IN
L9 SW OSC
L11 MW OSC
6
AM OSC
11
L17
L18
FM RF
L14 FM OSC
9
REG
VT
VT
15
18
17
IF OUT
3
FM
DISCRI
7
AFC
CF2
CF3
CF1
CF4
10.7MHz
450kHz
450kHz IFT
T1
FM IF IN
AM IF IN
2
16
BAND
CT2
CT1
CT3
Q11
20
METER
24
25
DET
AF IN
Q13
AF OUT
27
B +
VOL
5
Q14
NF
RV1
IC1
FM/AM FRONT-END,IF,DET,AF AMP
ANT101
(TELESCOPIC)
BAND(MW/SW)
BAND(FM/AM)
MAIN BOARD
IC2
3.0V REG
VOUT VIN
1
IC3
3.0V REG
VOUT VIN
1
2
+3V-2
+3V-2
+3V-2
Q15,Q16
+
+
JACK BOARD
DCJ301
EPJ301
SP301
DC IN 4.5V
EARPHONE )
( SPEAKER )
28
2
VT
VDET
VCOL
VCOH
VDD
GND
BAND(FM/AM)
BAND(MW/SW)
MUTE
BEEP
B +
POWER
BAND(FM/AM)
BAND(MW/SW)
MUTE
BEEP
POWER
CN1
W101
CN2
W102
VDD 23
4
5
5
2
3
3
52
Q101
AMP
20
21
VCOL
VCOH
DC/DC
CONVERTER
TUNING
CONTROL
Q153,Q154,T101
Q151,Q152
19
IC102 +3.2V
VOLTAGE DET.
IC103 +2.5V
VOLTAGE DET.
1
1
2
2
53
50
BATT LOW
CE
35
49
9
6
15
1
34
31
16
19
13
10
LCD0
LCD14
COM0
COM3
KEY SCAN0
KEY SCAN3
KEY RET0
KEY RET3
51 INT
VDD
VDD
S115
HOLD
24
25
XOUT
XIN
X101
75kHz
IC101
DIGITAL TUNING SYSTEM CONTROL
S101-S114
KEY
MATRIX
LCD101
Signal Path
KEY BOARD
VT
EO
VDD
VOUT
VDD
VOUT
4
BAT301
(+13V)
(
MW FREQUENCY
COVERAGE
SW
TRACKING
SW FREQUENCY
COVERAGE
FM
TRACKING
MW
TRACKING
VOL
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
3PCS, 4.5V
SIZE "AA"
(IEC DESIGNATION R6)
3PCS, 4.5V
AM IF
OFF
ON
R
8
8
ICF-M410S
4-2. SCHEMATIC DIAGRAM
IC B/D
IC-102 S-80732
IC-103 S-80825
• See page 6 for Wavefoms. • See page 10 for IC Pin Function Description.
• See page 10 for IC Block Diagrams.
• See page 10 for IC Block Diagrams.
Ver. 1.2
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