6-2. Main Board Section .......................................................... 16
7. ELECTRICAL PARTS LIST ........................................ 17
SAFETY-RELATED COMPONENT W ARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY P ARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
2
Page 3
1-1. CORD DRESSING
d
(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).
ICF-C112
SECTION 1
SERVICING NOTES
screw P 3x10
power cord retainer boar
power cord
1-2. POINTER ALIGNMENT
1
pointer
6
P 3x10
2
knob (tuning)
chassis
5
MAIN board
4
3
3
Page 4
ICF-C112
SECTION 2
GENERAL
This section is extracted
from instruction manual.
4
Page 5
SECTION 3
DISASSEMBLY
Note : This set can be disassemble according to the following sequence.
SET
3-1.PANEL (FRONT)
(Page 5)
3-2.CABINET (UPPER) SINGLE ASSY
(Page 6)
3-3.MAIN BOARD SECTION
(Page 6)
3-4.MAIN BOARD, LED101, SWITCH BOARD
(Page 7)
ICF-C112
Note : Follow the disassembly procedure in the numerical order given.
3-1. P ANEL (FRONT)
claws
2
3
panel (front)
claws
1
P 2.6x8
5
Page 6
ICF-C112
y
3-2. CABINET (UPPER) SINGLE ASSY
3
cabinet (upper) single ass
4
3-3. MAIN BOARD SECTION
2
P 3x30
1
Removal the solders.
2
CN1
1
P 3x30
3
P 3x10
4
MAIN board section
6
Page 7
3-4. MAIN BOARD, LED101, SWITCH BOARD
d
7
Removal the solders.
5
4
P 3x10
claw
6
MAIN board
2
SWITCH boar
ICF-C112
8
LED101
claw
1
3
Removal the solders.
P 3x10
7
Page 8
ICF-C112
)
SECTION 4
ELECTRICAL ADJUSTMENTS
FM SECTION 0 dB = 1 µV
Setting:
BAND switch: FM
VOLUME control: MIN
FM RF signal
generator
0.01
400Hz, 30% FM modulation
frequency deviation
Output level: as low as possible
±
22.5kHz
AM SECTION
Setting:
BAND switch: AM
VOLUME control: MIN
AM RF signal
generator
400Hz, 30%
AM modulation
Output level: as low as possible
FM lead wire
antenna terminal
µ
F
set
Put the lead-wire
antenna close to
the set.
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L2CT6
86.5 MHz109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1CT5
86.5 MHz109.5 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.
L3CT4
515 kHz1,750 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4CT3
600 kHz1,400 kHz
Adjustment Location: See page 9.
• Connecting Level Meter (FM and AM)
level meter
(range: 0.5–5 V ac
Ω
16
set
speaker terminal
Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally done
by the trimmer capacitors.
8
Page 9
Adjustment Location:
G
LEAD WIRE
ANTENNA
(SPEAKER)
FM
SP1
SP1
ICF-C112
T1
AM IF
ADJ
L4
L2
L1
CT5
CT6
CT3
CT4
L3
RV1
T1
+
+
L4, CT3
AM
TRACKING
ADJ
TRACKIN
CV1
TUNING
S1
BAND
FM
AM
L3, CT4
AM FREQUENCY
COVERAGE ADJ
L1, CT5
FM
ADJ
L2, CT6
FM FREQUENCY
COVERAGE ADJ
9
Page 10
ICF-C112
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 Ω and 1/
specified.
f
•
• C : panel designation.
Note: The components identified by mark 0 or dotted line
• 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
•Voltage is dc with respect to ground under no-signal
•Voltages are taken with a VOM (Input impedance 10 MΩ).
• Signal path.
: internal component.
with mark 0 are critical for safety .
Replace only with part number specified.
supply from battery terminal.
(detuned) condition.
no mark : FM
(): AM
Voltage variations may be noted due to normal production tolerances.
F: FM
f: AM
4
W or less unless otherwise
SECTION 5
DIAGRAMS
Common Note on Printed Wiring Boards:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
f
•
•: Pattern from the side which enables seeing.
: internal component.
10
Page 11
5-1. BLOCK DIAGRAM
ICF-C112
FM
LEAD WIRE
ANTENNA
CT3,L4
AM
TRACKING
FREQUENCY
CT5,L1
FM
TRACKING
CT6,L2
FM
FREQUENCY
COVERAGE
FERRITE-ROD
CT4,L3
AM
COVERAGE
AM
ANTENNA
• Signal path
: FM
: AM
L1
L2
L4
L3
TUNING
LED DISPLAY
CV1-3 CT5
CV1-4 CT6
CV1-1 CT3
CV1-2 CT4
CV1
LED101
(12H)
16
BAND SW
FM ANT
13
FM RF
1015
FM FRONT-ENDAM FRONT-END
FM OSC
8
AM ANT
11
AM OSC
6
+B
14
1-13
15,16
17
1
|
13
S1
BAND
FM
AM
MIX OUT
REG
9
VREG
OSC1/25 or 1/30
DISPLAY
DECODER/
DRIVER
CF3
FM DISCRI
3
DISCRI
FM
DISCRIMINATOR
ALARM
DISP
19
S103
ALARM
FM
IF IN
18
AM
IF IN
17
FM/AM
FRONT-END
IF AMP,DET
IC101
ALARM CLOCK
S105
TIME SET
M
D114
IC1
CF2
T1
CF1
T1
AM IF
DISPLAY
CONTROL
SLEEP
INPUT
23212224
S108
SLEEP
FM IF
AM IF
ALARM TIME CTR
INPUT
CONTROL
MIN SET
DET OUT
S104
CLOCK
2425
HOUR SET
S106
TIME SET
H
+B
RV1
w VOLUME
27
OUTPUT
CONTROL
SNOOZE INPUT
AF IN
AF POWER
AMP
Q302
RIPPLE
FILTER
SLEEP OUT
ALARM
ALARM OFF
S111
SNOOZE/SLEEP OFF
+B
5
VOL
S100
ALARM
VOL
HIGH
LOW
VDD
OUT
Q1
AF OUT
15
17
16
18
(Function Selector)
VREG
28
NF
4
+B
S101-1S101-2
S101
BUZZER
RADIO
RADIO ON
ALARM
OFF
SWITCH
Q301
D302
D301D111
D304
D112
SP1
(SPEAKER)
DRY BATTERY
"006P" 9V
(IEC DESIGNATION 6F22)
KEEP THE CORRECT
TIME DURING POWER
STOPPAGE
< BACK UP >
T301
POWER
TRANSFORMER
~
AC IN
1111
Page 12
ICF-C112
5-2. PRINTED WIRING BOARDS • Refer to page 10 for Common Note on Printed Wiring Boards.
R21-216-829-11 METAL CHIP4.7K5%1/10W
R31-216-801-11 METAL CHIP225%1/10W
R41-216-845-11 METAL CHIP100K5%1/10W
R51-216-833-11 METAL CHIP10K5%1/10W
R61-216-841-11 METAL CHIP47K5%1/10W
R81-216-821-11 METAL CHIP1K5%1/10W
R91-216-805-11 METAL CHIP475%1/10W
R101-216-837-11 METAL CHIP22K5%1/10W
R111-216-829-11 METAL CHIP4.7K5%1/10W
R131-216-833-11 METAL CHIP10K5%1/10W
R141-216-825-11 METAL CHIP2.2K5%1/10W
R151-216-817-11 METAL CHIP4705%1/10W
R1011-216-805-11 METAL CHIP475%1/10W
R1081-216-845-11 METAL CHIP100K5%1/10W
R1091-216-845-11 METAL CHIP100K5%1/10W
R1101-216-845-11 METAL CHIP100K5%1/10W
R1111-216-845-11 METAL CHIP100K5%1/10W
R1121-216-845-11 METAL CHIP100K5%1/10W
R1131-216-845-11 METAL CHIP100K5%1/10W
R1141-216-845-11 METAL CHIP100K5%1/10W
R1151-216-845-11 METAL CHIP100K5%1/10W
R1161-216-845-11 METAL CHIP100K5%1/10W
R1171-216-849-11 METAL CHIP220K5%1/10W
R1331-216-845-11 METAL CHIP100K5%1/10W
R1351-249-389-11 CARBON4.75%1/4W
The components identified by
mark 0 or dotted line with mark
0 are critical for safety.
Replace only with part number
specified.
Page 19
MEMO
ICF-C112
19
Page 20
ICF-C112
REVISION HISTOR Y
Clicking the version allows you to jump to the revised page.
Also, clicking the version at the upper right on the revised page allows you to jump to the next revised
page.
Ver.DateDescription of Revision
1.02003. 03New
20
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