Sony ICF-C212 (serv.man2) Service Manual ▷ View online
ICF-C212
5
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET (UPPER)
r
The equipment can be removed using the following procedure.
Cabinet (upper)
Set
Main board
2-2. MAIN BOARD
1
Five screws +P 3x14
2
Claw
3
4
Claw
5
Cabinet (upper)
Cabinet (lower)
Panel
2
Claw
1
Claws
2
3
Main board
Snap, battery
Cabinet (lower)
ICF-C212
6
INSTALLATION POWER CORD
POINTER INSTALLATION
Cabinet (lower)
Power cord
Wind the power cord to the boss twice
2
Turn RV1 fully in the
arrow direction.
1
Turn the shaft of CV1
fully in the arrow direction.
5
Turn the knob (VOL)
fully in the arrow direction
A
to be the warking
between arrows
A
and
B
.
3
Pointer
4
Knob (tune)
6
Main board
Cabinet (lower)
Marking
CV1
B
A
RV1
RV1
Knob (VOL)
ICF-C212
7
SECTION 3
ELECTRICAL ADJUSTMENTS
TUNER SECTION
AM/LW Section
Procedure :
BAND
: AM
VOLUME : MIN
FM Section
Procedure :
BAND
: FM
VOLUME : MIN
AM RF signal
generator
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
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
antenna
terminal
(JW1)
terminal
(JW1)
0.01µF
set
8
Ω
speaker terminal
level meter
• 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.
T1
455kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
520kHz
<516.5kHz>
CT4
1,750kHz <1631.5kHz>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
620kHz
CT1
1,400kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
86.5MHz
<87.35MHz>
CT3
109.5MHz <108.25MHz>
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
86.5MHz
<87.35MHz>
CT2
109.5MHz <108.25MHz>
0dB=1
µV
ICF-C212
8
Adjustment Location : Main board (Component side)
CT3 : FM Frequency Coverage Adjustment
L3 : FM Frequency Coverage Adjustment
L4 : AM Frequency Coverage Adjustment
CT4 : AM Frequency Coverage Adjustment
L1 : AM Tracking Adjustment
T1 : AM IF Adjustment
CT1 : AM Tracking Adjustment
CT2 : FM Tracking Adjustment
L2 : FM Tracking Adjustment
JW1
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