Sony ICF-C411 Service Manual ▷ View online
6
ICF-C411
3-2. MAIN BOARD
3-3. KEY BOARD, LED BOARD
9
screws (P 3x10)
0
MAIN board
8
Removal the solder
2
screw (P 3x10)
3
screw (P 3x10)
5
claw
4
claw
6
1
knob (volume)
7
CN1
1
screw (P 3x10)
2
KEY board
4
LED board
5
LED101
3
claw
7
ICF-C411
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT3
86.5 MHz
109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
CT2
86.5 MHz
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
CT4
515 kHz
1,750 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
600 kHz
1,400 kHz
FM SECTION 0 dB = 1 µV
Setting:
BAND switch: FM
VOLUME control: MIN
BAND switch: FM
VOLUME control: MIN
AM SECTION
Setting:
BAND switch: AM
VOLUME control: MIN
BAND switch: AM
VOLUME control: MIN
SECTION 4
ELECTRICAL ADJUSTMENTS
FM lead wire
antenna terminal
antenna terminal
0.01
µ
F
FM RF signal
generator
generator
400Hz, 30% FM modulation
frequency deviation
frequency deviation
±
22.5kHz
Output level: as low as possible
set
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
• Connecting Level Meter (FM and AM)
Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally done
by the trimmer capacitors.
frequency coverage and tracking adjustments should be finally done
by the trimmer capacitors.
speaker terminal
set
16
Ω
level meter
(range: 0.5–5 V ac)
(range: 0.5–5 V ac)
Adjustment Location: See page 8.
8
ICF-C411
Adjustment Location:
T1
RV1
S1
BAND
SP1
L2
L1
L3
L4
FM
AM
CV1
TUNING
SP1
(SPEAKER)
CT3
CT2
CT4
CT1
CT4, L4
AM
FREQUENCY
COVERAGE
ADJUSTMENT
CT3, L3
FM
FREQUENCY
COVERAGE
ADJUSTMENT
FM
LEAD WIRE
ANTENNA
CT1, L1
AM
TRACKING
ADJUSTMENT
T1
AM
IF
ADJUSTMENT
CT2, L2
FM
TRACKING
ADJUSTMENT
– MAIN board (component side) –
ICF-C411
9
9
SECTION 5
DIAGRAMS
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
BOARDS AND SCHEMATIC DIAGRAMS.
Common Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
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.
• Total current is measured.
• Power voltage is dc 9V and fed with regulated dc power
• H : adjustment for repair.
• Total current is measured.
• Power voltage is dc 9V and fed with regulated dc power
supply from battery terminal.
• Voltage is dc with respect to ground under no-signal
(detuned) condition.
no mark : FM
(
no mark : FM
(
) : AM
• Voltages are taken with a VOM (Input impedance 10 M
Ω).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Signal path.
F
: FM
f
: AM
Note: The components identified by mark 0 or dotted line
with mark 0 are critical for safety.
Replace only with part number specified.
Replace only with part number specified.
Common Note on Printed Wiring Boards:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•
f
: internal component.
•
: Pattern from the side which enables seeing.
5-1. CIRCUIT BOARDS LOCATION
MAIN board
KEY board
POWER board
LED board
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