Sony Dream Machine ICF-C411 User manual

1
SERVICE MANUAL
Singapore Model
ICF-C411
FM/AM CLOCK RADIO
SPECIFICATIONS
Ver 1.0 2001.03
Sony Corporation
Audio Entertainment Group
General Engineering Dept.
9-873-096-11
2001C0400-1
© 2001.3
Time display
24-hour system
Frequency range
FM: 87.5 - 108 MHz
AM: 530 - 1710 kHz
Speaker
Approx. 6.6 cm (2 5/8 inches) dia., 8 ohm
Power output
120 mW (at 10% harmonic distortion)
Power requirements
220 - 230 V AC, 50 Hz
For the power back-up function: 9 V DC, one 6F22 battery
Battery life
Approx. 20 hours (for clock backup), using Sony S-006P
(6F22) battery
Dimensions
Approx. 215 ×106.4 ×99.8 mm (w/h/d)
(8 1/2 ×4 1/4 ×4 inches) incl. projecting parts and controls
Mass
Approx. 780 g (1 lb 11.5 oz) not incl. battery
Design and specifications are subject to change without notice.

2
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE
WITH MARK 0ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
Notes on Chip Component Replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
ICF-C411
TABLE OF CONTENTS
1. SERVICING NOTES
1-1. Cord Dressing (Power Cord) ............................................... 3
1-2. Pointer Alignment ............................................................... 3
2. GENERAL............................................................................ 4
3. DISASSEMBLY
3-1. Cabinet (Upper) Section ...................................................... 5
3-2. Main Board ......................................................................... 6
3-3. Key Board, LED Board ....................................................... 6
4. ELECTRICAL ADJUSTMENTS................................... 7
5. DIAGRAMS
5-1. Circuit Boards Location ...................................................... 9
5-2. Block Diagram .................................................................. 10
5-3. Printed Wiring Boards – Main, Power Section – .............. 11
5-4. Printed Wiring Boards – Key, LED Section – ................... 12
5-5. Schematic Diagram ........................................................... 13
6. EXPLODED VIEWS
6-1. Cabinet (Upper) Section .................................................... 14
6-2. Chassis Section ................................................................. 15
6-3. Cabinet (Lower) Section ................................................... 16
7. ELECTRICAL PARTS LIST......................................... 17

3
ICF-C411
SECTION 1
SERVICING NOTES
1-2. POINTER ALIGNMENT
power cord
7 screws (P 3x10)
2 pointer retainer boar
d
8 knob (tuning)
4 gear (VC)
6 MAIN board
gear (VC)
Align is the projection.
1
5
3
chassis
chassis
pointer
pointer
1-1. CORD DRESSING
(POWER CORD)
1) Set the power cord as shown in the figure.

4
ICF-C411
SECTION 2
GENERAL This section is extracted
from instruction manual.

5
ICF-C411
• The equipment can be removed using the following procedure.
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1. CABINET (UPPER) SECTION
Set Cabinet (Upper) Section Main Board Key Board, LED Board
1 screws (P 3x14
)
5 cabinet (upper) section
4 CN301
2 screws (P 3x14)
3 screw (P 3x14)

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
AM SECTION
Setting:
BAND switch: AM
VOLUME control: MIN
SECTION 4
ELECTRICAL ADJUSTMENTS
FM lead wire
antenna terminal
0.01
µ F
FM RF signal
generator
400Hz, 30% FM modulation
frequency deviation
± 22.5kHz
Output level: as low as possible
set
Put the lead-wire
antenna close to
the set.
AM RF signal
generator
400Hz, 30%
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.
speaker terminal
set
16
Ω
level meter
(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 WIR
E
ANTENNA
CT1, L1
AM
TRACKING
ADJUSTMENT
T1
AM
IF
ADJUSTMENT
CT2, L2
FM
TRACKING
ADJUSTMENT
–MAIN board (component side) –

ICF-C411
99
SECTION 5
DIAGRAMS
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
Common Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ωand 1/4W 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
supply from battery terminal.
• Voltage is dc with respect to ground under no-signal
(detuned) condition.
no mark : FM
( ) : AM
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
F: FM
f: AM
Note: The components identified by mark 0or dotted line
with mark 0are critical for safety.
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.
•f: internal component.
•: Pattern from the side which enables seeing.
5-1. CIRCUIT BOARDS LOCATION
MAIN boar
d
KEY board
POWER board
LED board

ICF-C411
1010
5-2. BLOCK DIAGRAM
W5
28
16
9
1
|
13
22 23
27
AF POWER
AMP
FM IF
AM IF
FM
DISCRIMINATOR
5
17
18
RIPPLE
FILTER
INPUT
CONTROL
SLEEP
CONTROL
SNOOZE
CONTROL OUTPUT
CONTROL
DISPLAY
CONTROL
LED101
CLOCK DISPLAY
DISPLAY
ECODER/
DRIVER
OSC 1/25 or 1/30
Q2
+B
SWITCH
Q101
2421
TIME SET INPUT
ALM DISP SELECT
RT-TIME SET/ DIMMER
SLEEP/SNOOZE ON/OFF INPUT ALM-2 OUTPUT ALM-1 OUTPUT
S110
S101-2
BRIGHTNESS
HIGH
S105
FAST-
S104
FAST+
S103
TIME SET
+
S109
SNOOZE
S108
SLEEP
S107
RADIO
ON
S106
OFF/
ALARM
RESET
D305
DRY BATTERY
"S-006P"9V
(IEC DESIGNATION 6F22)
T301
POWER
TRANSFORMER
+B
+B
L2
CV1-2 CT2
CV1-3 CT3
CV1-1 CT1
CV1-4 CT4
CT2,L2
FM
TRACKING
L3
L1
L4
CT3,L3
FM
FREQUENCY
COVERAGE
CT4,L4
AM
FREQUENCY
COVERAGE
CT1,L1
AM
TRACKING
AM
FERRITE-ROD
ANTENNA
CV1
TUNING
T1
AM IF
FM FRONT-ENDAM FRONT-END
IC1
FM/AM
FRONT-END
IF AMP,DET
FM ANT
FM RF
FM OSC
AM ANT
AM OSC
VREG
13
10 15
8
11
6
MIX OUT CF3
CF2
T1
FM
IF IN AF IN AF OUT
NF
+B
+B
+B
DET OUT
AM
IF IN
DISCRI
VOL
CF1
10.7MHz
VREG
Q1
RV1
w VOLUME
IC101
ALARM CLOCK
S1
BAND
AM FM
BAND SW
SP1
(SPEAKER)
KEEP THE CORRECT
TIME DURING POWER
STOPPAGE
REG
FM
LEAD WIRE
ANTENNA
W1
SPEED/
POWER
DOWN
Q102
D202
D103 D102
D201
W2W2
MAIN BOARD
LED BOARD
KEY BOARD
POWER BOARD
3
•Signal path
: FM
: AM
4
24 25
LOW
ALARM TIME/
CLOCK SET
HOLD
RADIO
BUZZER
CLOCK
S101
(Function Selector) S102 (Function Selector)
ALARM MODE
RADIO +BUZZER
RADIO
BUZZER
RADIO
ALARM
BUZZER
OFF
S101
(Function Selector)
ALARM MODE
RADIO + BUZZER
RADIO
BUZZER
OFF
D303
+B
+B
D302
PS301
D106
D107
D104
D108
27
S101-1
S102-2
S102-1
AC IN~
CN301
SWITCH
Q103
17 SWITCH
Q301
W4
W3
CN1
20 19
3
43
12
6
1
5
7
3
6
1
5
7
1
3
4
2
+B
2-14
15-17
+B
S105 S104 S103 S109 S108 S107 S106