Sony ICF-704S Service Manual ▷ View online
5
ICF-704S
2-2. CHASSIS SECTION
2-1. CABINET (FRONT) ASSY
Note : Follow the disassembly procedure in the numerical order given.
5
two BV tapping screws
(B2.6)
6
two BV tapping screws
(B2.6)
7
two BV tapping screws
(B2.6)
8
screw
(M3)
9
qs
cabinet (rear) assy
qd
cabinet (front) assy
1
knob (TUNE)
0
antenna contact plate
4
transparent cover
claw
2
screw
(1.7)
3
two screws
(1.7)
qa
CN1
handle
battery case lid
3
chassis section
1
Remove the two solderings.
2
two BV tapping screws
(B2.6)
6
ICF-704S
2-4. SETTING THE POINTER
2-3. MAIN BOARD
4
BV tapping screw
(B2.6)
2
screw
(M2.6)
3
VC drum
5
claw
6
claw
D2
7
8
1
two knobs (control)
9
chassis assy
0
MAIN board
VC drum
boss
boss
pointer
back plate
rack
rack
chassis
1. Rotate the VC drum in the direction of the arrow until it is stopped.
2. Fit the rack on the projection of the chassis.
3. Fit the back plate on the bosses and attach the plate.
4. Install the pointer.
2. Fit the rack on the projection of the chassis.
3. Fit the back plate on the bosses and attach the plate.
4. Install the pointer.
• Setting the Pointer
7
ICF-704S
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
AM RF signal
generator
generator
400Hz, 30%
AM modulation
Output level: as low as possible
AM modulation
Output level: as low as possible
• 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.
SW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L7
5.85 MHz
CT3
18.25 MHz
SW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L6
5.85 MHz
CT2
18.25 MHz
SECTION 3
ELECTRICAL ADJUSTMENTS
SW SECTION
BAND switch : SW
telescopic
antenna terminal
antenna terminal
10pF
AM RF signal
generator
generator
400Hz, 30%
AM modulation
Output level: as low as possible
AM modulation
Output level: as low as possible
set
16
Ω
set
v
jack (J1)
level meter
• 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.
MW IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
455 kHz
MW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L5
520 kHz
CT1-2
1,650 kHz
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L4
600 kHz
CT1-1
1,400 kHz
MW SECTION
BAND switch : MW
16
Ω
set
v
jack (J1)
level meter
8
ICF-704S
telescopic
antenna terminal
antenna terminal
0.01
µ
F
FM RF signal
generator
generator
22.5kHz frequency deviation
by 400Hz signal
Output level: as low as possible
by 400Hz signal
Output level: as low as possible
set
16
Ω
set
v
jack (J1)
level meter
• 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.
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L3
86.5 MHz
CT1-4
109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1, 2
86.5 MHz
CT1-3
109.5 MHz
Adjustment Location: MAIN BOARD
FM SECTION
BAND switch : FM
L1,2
FM
TRACKING
ADJUSTMENT
FM
TRACKING
ADJUSTMENT
L6
SW
TRACKING
ADJUSTMENT
SW
TRACKING
ADJUSTMENT
CT2
SW
TRACKING
ADJUSTMENT
SW
TRACKING
ADJUSTMENT
T1
MW
IF
ADJUSTMENT
MW
IF
ADJUSTMENT
L3
FM
FREQUENCY
COVERAGE
ADJUSTMENT
FM
FREQUENCY
COVERAGE
ADJUSTMENT
L5
MW
FREQUENCY
COVERAGE
ADJUSTMENT
MW
FREQUENCY
COVERAGE
ADJUSTMENT
L7
SW
FREQUENCY
COVERAGE
ADJUSTMENT
SW
FREQUENCY
COVERAGE
ADJUSTMENT
CT3
SW
FREQUENCY
COVERAGE
ADJUSTMENT
SW
FREQUENCY
COVERAGE
ADJUSTMENT
L4
MW
TRACKING
ADJUSTMENT
MW
TRACKING
ADJUSTMENT
CT1-4
FM
FREQUENCY
COVERAGE
ADJUSTMENT
FM
FREQUENCY
COVERAGE
ADJUSTMENT
CT1-3
FM
TRACKING
ADJUSTMENT
FM
TRACKING
ADJUSTMENT
CT1-2
MW
FREQUENCY
COVERAGE
ADJUSTMENT
MW
FREQUENCY
COVERAGE
ADJUSTMENT
CT1-1
MW
TRACKING
ADJUSTMENT
MW
TRACKING
ADJUSTMENT
– MAIN BOARD (SIDE A) –
– MAIN BOARD (SIDE B) –
CV1
S1
RV1
RV2
J1
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