Sony ICF-C112 Manual de usuario
1
SERVICE MANUAL
E Model
ICF-C112
FM/AM CLOCK RADIO
SPECIFICATIONS
Ver 1.0 2003. 03
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
9-877-123-01
2003C0400-1
© 2003. 03
Time display:
12-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:
120 V AC, 60 Hz
For the power backup function: 9V DC, one 6F22 battery
Battery life:
Approx. 14 hours, using Sony 006P (6F22) battery
Dimensions:
Approx. 135 ×100 ×130 mm (w/h/d)
(5 3/8 ×4 ×5 1/8 inches) incl. projecting parts and controls
Mass:
Approx. 570 g (1 lb 4 oz) not incl. battery
Design and specifications are subject to change without notice.
2
TABLE OF CONTENTS
1. SERVICING NOTES
1-1. Cord Dressing (Power Cord)............................................... 3
1-2. Pointer Alignment ............................................................... 3
2. GENERAL
Installing the Battery ............................................................... 4
Setting the Clock ..................................................................... 4
Operating the Radio................................................................. 4
Setting the Alarm ..................................................................... 4
Setting the Sleep Timer ........................................................... 4
3. DISASSEMBLY
3-1. Panel (Front)........................................................................ 5
3-2. Cabinet (Upper) Single Assy............................................... 6
3-3. Main Board Section ............................................................ 6
3-4. Main Board, LED101, Switch Board .................................. 7
4. ELECTRICAL ADJUSTMENTS................................... 8
5. DIAGRAMS
5-1. Block Diagram .................................................................. 11
5-2. Printed Wiring Boards....................................................... 12
5-3. Schematic Diagram ........................................................... 13
5-4. IC Block Diagrams............................................................ 14
6. EXPLODED VIEWS
6-1. Cabinet (Upper) Section.................................................... 15
6-2. Main Board Section .......................................................... 16
7. ELECTRICAL PARTS LIST ........................................ 17
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-C112
3
ICF-C112
SECTION 1
SERVICING NOTES
1-1. CORD DRESSING
(POWER CORD)
1) Set the power cord as shown in the figure.
2) Mount the chassis with power cord retainer
board and screws (P 3 ×10).
Note: Tighten completely the screws (P 3 ×10).
1-2. POINTER ALIGNMENT
screw P 3x10
power cord retainer boar
d
power cord
6
P 3x10
4
3
1
pointer
2
knob (tuning)
5
MAIN board
chassis
4
ICF-C112 SECTION 2
GENERAL This section is extracted
from instruction manual.
5
ICF-C112
Note : This set can be disassemble according to the following sequence.
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1. PANEL (FRONT)
3-1. PANEL (FRONT)
(Page 5)
SET
3-2. CABINET (UPPER) SINGLE ASSY
(Page 6)
3-3. MAIN BOARD SECTION
(Page 6)
3-4. MAIN BOARD, LED101, SWITCH BOARD
(Page 7)
1
P 2.6x8
2
3
panel (front)
claws
claws
6
ICF-C112
3-2. CABINET (UPPER) SINGLE ASSY
3-3. MAIN BOARD SECTION
1
P 3x30
2
P 3x30
3
4
cabinet (upper) single ass
y
3
P 3x10
1
Removal the solders.
2
CN1
4
MAIN board section
7
ICF-C112
3-4. MAIN BOARD, LED101, SWITCH BOARD
4
P 3x10
1
P 3x10
claw
claw
6
MAIN board
2
SWITCH boar
d
5
7
Removal the solders.
3
Removal the solders.
8
LED101
8
ICF-C112
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L2 CT6
86.5 MHz 109.5 MHz
FM TRACKINGADJUSTMENT
Adjust for a maximum reading on level meter.
L1 CT5
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.
L3 CT4
515 kHz 1,750 kHz
AM TRACKINGADJUSTMENT
Adjust for a maximum reading on level meter.
L4 CT3
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
•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 9.
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
9
ICF-C112
Adjustment Location:
RV1
CV1
TUNING
L4
L1
L2
L3
CT6 CT4
CT5 CT3
SP1
(SPEAKER)
SP1 +
+
FM
LEAD WIRE
ANTENNA
L4, CT3
AM
TRACKING
ADJ
L1, CT5
FM
TRACKIN
G
ADJ
L2, CT6
FM FREQUENCY
COVERAGE ADJ
L3, CT4
AM FREQUENCY
COVERAGE ADJ
S1
BAND
FM
AM
T1
T1
AM IF
ADJ
10
ICF-C112 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 with no-signal.
•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
•Voltagesare takenwith a VOM (Inputimpedance 10 MΩ).
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.
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3
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