Sony ICF-C1200 Service Manual ▷ View online
Ver 1.0 2001.03
ICF-C1200
SERVICE MANUAL
FM STEREO/AM PLL
SYNTHESIZED RADIO
SPECIFICATIONS
US Model
AEP Model
E Model
Tourist Model
9-873-106-11
2001C0200-1
© 2001.3
Sony Corporation
Audio Entertainment Group
General Engineering Dept.
2
ICF-C1200
Specifications ........................................................................... 1
1. GENERAL
...................................................................... 2
2. DISASSEMBLY
2-1. Main Board ................................................................. 3
3. ELECTRICAL ADJUSTMENTS
3-1. Tuner Section .............................................................. 4
4. DIAGRAMS
4-1. Explanation of IC Terminals ....................................... 6
4-2. Block Diagram ............................................................ 7
4-3. Printed Wiring Boards
– Main Section (1/2) (Side A) – .................................. 8
4-4. Printed Wiring Boards
– Main Section (2/2) (Side B) – .................................. 9
4-5. Schematic Diagram ................................................... 10
4-2. Block Diagram ............................................................ 7
4-3. Printed Wiring Boards
– Main Section (1/2) (Side A) – .................................. 8
4-4. Printed Wiring Boards
– Main Section (2/2) (Side B) – .................................. 9
4-5. Schematic Diagram ................................................... 10
5. EXPLODED VIEWS
5-1. Main Section ............................................................. 13
6. ELECTRICAL PARTS LIST
...................................
14
TABLE OF CONTENTS
SECTION 1
GENERAL
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
LOCATION AND FUNCTION OF CONTROLS
This section is extracted from
instruction manual.
instruction manual.
r
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the
lead-free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed
with the lead free mark due to their particular size.)
lead-free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed
with the lead free mark due to their particular size.)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40
• Unleaded solder melts at a temperature about 40
°C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to
be applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set
to about 350
Ordinary soldering irons can be used but the iron tip has to
be applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set
to about 350
°C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
the heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscous (sticky, less prone to
flow) than ordinary solder so use caution not to let solder
bridges occur such as on IC pins, etc.
flow) than ordinary solder so use caution not to let solder
bridges occur such as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder
may also be added to ordinary solder.
may also be added to ordinary solder.
3
ICF-C1200
SECTION 2
DISASSEMBLY
2-1. MAIN BOARD
2
Screws (1.4X6 tapping)
4
Screws (1.4)
5
Claw
5
Claw
5
Claw
7
Remove solder
(three places)
Red
Cabinet (rear) ASSY
6
8
3
1
5
Claw
Cabinet (front) ASSY
Main board
Knob (HOLD)
ANT101
S301
Brown
• Caution during assembly
Align the hold switch(S301)
to the knob(HOLD).
to the knob(HOLD).
Black
Note : Follow the disassembly procedure in the numerical order given.
4
ICF-C1200
SECTION 3
ELECTRICAL ADJUSTMENTS
BAND button : AM
Volume : MIN
Volume : MIN
3-1.TUNER SECTION
AM Section
FM Section
BAND button : FM
Volume : MIN
Volume : MIN
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
AM RF signal
generator
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
telescopic
antenna
terminal
antenna
terminal
FM RF signal
generator
generator
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
400Hz signal.
Output level : as low as possible
0.01 uF
Adjustment Location : Main board (See page 5)
• 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 IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T101
1485kHz
<
1480kHz
>
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust part
Frequency display
L105
531kHz <530kHz>
reading on digital
voltmeter.
Adjustment value: 2.7V
Standaed value: 2.5 to 2.9V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L 102
585kHz <580kHz>
CT101
1,485kHz <1,480kHz>
Frequency Coverage Adjustment
Connect Location :
FM FREQUENCY COVERAGE CONFIRMATION
Adjust part Frequency display
Confirmation
87.5MHz
3.0 to 4.0V
Confirmation
108MHz
9.5 to 10.5V
reading on digital
voltmeter
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L103
87.5MHz
CT102
108MHz
32
Ω
level meter
set
J201 (phones)
+
–
0dB=1
µV
< > : US model
MAIN BOARD (SIDE A)
S308
(JOG SWITCH)
BAT401
PAS
TP
(VT)
C405
R404
C412
R403
R314
R315
R315
R405
C404
C301
C406
C407
R401
R402
D402
D403
BCE
Q402
B
Q
302
E
CB
T401
+
–
Digital
TP
(VT)
100K
Ω
voltmeter