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Model
ICF-M410L
Pages
16
Size
823.16 KB
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PDF
Document
Service Manual
Brand
Device
Audio
File
icf-m410l.pdf
Date

Sony ICF-M410L Service Manual ▷ View online

5
ICF-M410L
SECTION 3
ELECTRICAL ADJUSTMENTS
BAND : AM
• 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.
MW/LW SECTION
FM SECTION
[Adjustment Location : Main board] (Component side)
Put the lead-wire
antenna close to
the set.
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
AM RF signal
generator
0.01
µ
F
FM RF signal
generator
telescopic
antenna
terminal
75kHz (100%) amplitude modulation
by 1kHz signal.
Output level : as low as possible
16 
set
+
level meter
Speaker terminal (EPJ301)
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T15
450 kHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L6
87.5 MHz
CT3
108 MHz
BAND : FM
MAIN BOARD
(Component side)
CT2
LW TRACKING
adjustment
CT4
LW FREQUENCY
COVERAGE
adjustment
L4
MW FREQUENCY
COVERAGE
adjustment
T1
AM IF
adjustment
L6,CT3
FM TRACKING
adjustment
CT1
MW TRACKING
adjustment
MW/LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
LW
ANT102
162 kHz
CT2
243 kHz
MW
ANT102
603 kHz
CT1
1,404 kHz
MW/LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
LW
CT4
153 kHz
MW
L4
531 kHz
6
ICF-M410L
SECTION  4
DIAGRAMS
Note on Schematic Diagram:
• All capacitors are in 
µ
F unless otherwise noted.  p: pF.
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in 
 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
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
F
: FM
f
: AM (LW/MW)
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-M410L
4-1. BLOCK DIAGRAM
: FM
B.P.F
1
3
BPF1
Q2
BUFFER
13
10
8
FM RF IN
FM RF
FM OSC
AM RF IN
6
AM OSC
11
L6
L7
FM RF
L3 FM OSC
9
REG
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
CT3
Q5
20
METER
24
25
DET
AF IN
Q7
28
AF OUT
27
B +
VOL
5
Q4
NF
RV1
IC1
  FM/AM  FRONT-END,IF,DET,AF AMP
ANT101
(TELESCOPIC)
Q1
Q3
ANT102
(FERRITE-R0D)
CT1
CT2
CT4
L4  MW OSC
BAND(MW/LW)
BAND(FM/AM)
+
SP301
( SPEAKER )
IC2
3.0V REG
VOUT VIN
1
2
Q8,Q9
VT
VDET
VCOL
VCOH
GND
BAND(FM/AM)
BAND(MW/L
W)
MUTE
BEEP
B +
POWER
BAND(FM/AM)
BAND(MW/LW)
MUTE
BEEP
POWER
CN1
W101
CN2
W102
VDD 23
4
5
2
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
VT
VDD
EO
+
VOUT
VDD
VOUT
VDD
4
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
3PCS, 4.5V
(+13V)
FM
TRACKING
MW FREQUENCY
COVERAGE
LW FREQUENCY
COVERAGE
LW
TRACKING
MW
TRACKING
DCJ301
EPJ301
DC IN 4.5V
  EARPHONE )
 (   
VOL
MAIN BOARD
JACK BOARD
KEY BOARD
AM IF
OFF
ON
R
8
8
ICF-M410L
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.
Ver. 1.3
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