Sony ICF-304 Service Manual ▷ View online
5
ICF-304
2-3. CHASSIS ASSY
2-2. JACK BOARD
1
Remove the two solderings.
2
screw
3
JACK board
2
two screws
(+) BV tapping (B2.6)
3
chassis assy
JACK board
S2
1
knob (band)
6
ICF-304
2-5. DRUM AND KNOB (TUNE) ADJUSTMENT
2-4. MAIN BOARD
2
battery terminal (+)
1
Remove the three solderings.
8
MAIN board
JACK board
3
screw
(M1.7)
5
screw
6
two claws
7
claw
4
drum
4
screw
(M1.7)
3
drum
drum
2
two projections
knob (TUNE)
1
CV1
boss
boss
oval
• Drum and knob (TUNE) adjustment
1. Turn CV1 in the direction of the arrow fully.
2. Adjust the knob (TUNE) so that two projections are visible.
3. Position the boss as illustrated and adjust the oval so that the drum
and the knob (TUNE) are engaged for installation.
2. Adjust the knob (TUNE) so that two projections are visible.
3. Position the boss as illustrated and adjust the oval so that the drum
and the knob (TUNE) are engaged for installation.
7
ICF-304
2-6. SETTING THE POINTER
1
knob (TUNE)
2
pointer
chassis
mark
mark
pointer
• Setting the Pointer
1. Turn the knob (TUNE) in the direction of
A
until it is stopped.
2. Place the pointer as sown in the figure.
3. Mount the pointer and retainer plate (rack).
3. Mount the pointer and retainer plate (rack).
3
retainer plate (rack)
A
8
ICF-304
• 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
L5
86.5 MHz
CT1-4
109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2, L3
86.5 MHz
CT1-3
109.5 MHz
SECTION 3
ELECTRICAL ADJUSTMENTS
FM SECTION
BAND switch: FM
telescopic
antenna terminal
antenna terminal
FM RF signal
generator
generator
400Hz, 30% FM modulation
frequency deviation 22.5kHz
output level: as low as possible
frequency deviation 22.5kHz
output level: as low as possible
set
0.01
+
–
F
16
Ω
set
v
jack (J1)
level meter
Adjustment Location: MAIN BOARD
• 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.
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L6
520 kHz
CT1-2
1,650 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
620 kHz
CT1-1
1,400 kHz
AM SECTION
BAND switch: AM
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
16
Ω
set
v
jack (J1)
level meter
L1
AM TRACKING
ADJUSTMENT
L2,L3
FM TRACKING
ADJUSTMENT
CT1-1
AM TRACKING
ADJUSTMENT
CT1-3
FM TRACKING
ADJUSTMENT
CT1-4
FM FREQUENCY
COVERAGE
ADJUSTMENT
CT1-2
AM FREQUENCY
COVERAGE
ADJUSTMENT
L5
FM
FREQUENCY
COVERAGE
ADJUSTMENT
L6
AM
FREQUENCY
COVERAGE
ADJUSTMENT
– MAIN BOARD (Component Side) –
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