Sony ICF-R40 Service Manual ▷ View online
– 5 –
SECTION 3
DIAL POINTER SETTING
Note:
Follow the assembly procedure in the numerical order given.
A
4
knob (tune)
1
Insert the pointer in the groove of
cabinet (front) assy and slide
in the direction of the arrow
cabinet (front) assy and slide
in the direction of the arrow
A
.
3
gear
(midway)
(midway)
cabinet (front) assy
cabinet (front) assy
the tip of pointer
pointer
marking
2
Set the tip of pointer to the marking
of cabinet (front) assy.
of cabinet (front) assy.
8
Rotate the gear
(tuning capacitor) fully
in the direction of the arrow
(tuning capacitor) fully
in the direction of the arrow
C
.
C
B
9
MAIN board
Note: On installation of MAIN board,
Note: On installation of MAIN board,
set the outline of gear
(tuning capacitor).
(tuning capacitor).
boss
oval
6
To install the gear
fixing each oval shape,
set the boss of the gear
(tuning capacitor) as the figure.
fixing each oval shape,
set the boss of the gear
(tuning capacitor) as the figure.
7
screw
(1.7
(1.7
×
3)
5
Rotate the tuning capacitor
shaft fully in the direction of
the arrow
shaft fully in the direction of
the arrow
B
.
cabinet (front) assy
– 6 –
[FM]
Setting:
POWER switch: AUTO OFF
Band switch: FM
Output select switch:
POWER switch: AUTO OFF
Band switch: FM
Output select switch:
@ (earphone)
[AM]
Setting:
POWER switch: AUTO OFF
Band switch: AM
Output select switch:
POWER switch: AUTO OFF
Band switch: AM
Output select switch:
@ (earphone)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
Adjustment Location:
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
75 MHz
CT1-3
109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
75 MHz
CT1-4
109.5 MHz
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455 kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
515 kHz
CT1-1
1,650 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
600 kHz
CT1-2
1,400 kHz
SECTION 4
ELECTRICAL ADJUSTMENTS
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
deviation by 400 Hz
signal
Output level: as low as possible
+
–
–
level meter
@
(earphone) jack (J1)
set
TP
(FM IN)
16
Ω
0.01
µ
F
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
+
–
–
level meter
set
16
Ω
@
(earphone) jack (J1)
CT1-4
L2
L2
FM Tracking Adjustment
CT1-3
L3
L3
CT1-2
L1
L1
AM Frequency Coverage
Adjustment
CT1-1
T1
AM IF Adjustment
L4
AM Frequency Coverage Adjustment
TP (FM IN)
J1
@
(earphone) jack
– MAIN BOARD (Component Side) –
FM Frequency Coverage
Adjustment
AM Tracking Adjustment
0 dB=1 µV
ICF-R40
– 7 –
– 8 –
SECTION 5
DIAGRAMS
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
MIX
OUT
CF2
10.7MHz
CF1
455kHz
CF3
10.7MHz
Q1
TONE CONTROL
SWITCH
FM RF
FM IF
3
FM
DISCRIMINATOR
TUNING METER
DISCRI
28
AF
OUT
SP1
(SPEAKER)
AF
IN
IN
24
16
25
DET
AM IF
METER
VOL
5
BAND
REG
AM OSC
L4
AM OSC
L3
FM OSC
L1
AM FERRITE-ROD
ANTENNA
FM OSC
AM
ANT
ANT
L2
FM RF
FM/AM FRONT-END,
FM/AM IF AMP, DET, AGC, AF AMP
IC1
TIMER
IC2
CT1-2
+
+
CT1-3, L3
FM FREQUENCY
COVERAGE
CT1-1, L4
AM FREQUENCY
COVERAGE
CT1-4, L2
FM TRACKING
CT1-2, L1
AM TRACKING
T1
AM IF
• SIGNAL PATH
: FM
: AM
05
9
DRY BATTERY
SIZE “AAA”
(IEC DESIGNATION R03)
2PCS. 3V
FM/AM TUNER
(IC1) B+
J1
(EARPHONE)
@
EP1
(EARPHONE)
B+ SWITCH
Q3
BAND-PASS
FILTER
Q2
CR
OSCILLATOR
COUNTER
OSC
CHATTERING
PROTECTOR
CONTROL
B+
OUT
SET
RESET
D5
C33, R15 – 17
VDD
OSC1 – OSC3
8
7
6
5
1 – 3
ON
OFF
AUTO OFF
S2
POWER
D2
TUNE
RV1
VOL
CV1
TUNE
CV1
TUNE
AM
FM
S4
BAND
S5
NOISE CUT
ON
OFF
CT1-4
CT1-3
CV1-2
CV1-4
CT1-1
CV1-1
CV1-3
S1
@/™
EARPHONE
SPEAKER
27
REG
B+
(1.25V)
VCC
5-1.
BLOCK DIAGRAM
ICF-R40
– 9 –
– 10 –
• Semiconductor
Location
Ref. No.
Location
D1
C-3
D2
B-1
D5
B-3
IC1
F-2
IC2
B-3
Q1
C-2
Q2
C-2
Q3
B-3
Note on Printed Wiring Board:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
W
: indicates side identified with part number.
•
r
: Through hole.
•
¢
: internal component.
• b
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side)
the parts face are indicated.
5-2.
PRINTED WIRING BOARD
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