DOWNLOAD Sony ICF-C218 (serv.man2) Service Manual ↓ Size: 512.25 KB | Pages: 16 in PDF or view online for FREE

Model
ICF-C218 (serv.man2)
Pages
16
Size
512.25 KB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
icf-c218-sm2.pdf
Date
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Sony ICF-C218 (serv.man2) Service Manual ▷ View online

5
ICF-C218
SECTION 2
DISASSEMBLY
2-1. DISASSEMBLY FLOW
2-2. FRONT PANEL, UPPER CABINET ASSY
2-2. FRONT PANEL,
        UPPER CABINET ASSY
           (Page 5)
2-3. MAIN BOARD
(Page 6)
SET
4
7
1
 
two screws
     (+BVTP2.6)
6
 
three screws
     (+BVTP2.6)
2
 
five claws
3
 
two claws
lower cabinet assy
8
 
upper cabinet assy
5
 
front panel
6
ICF-C218
2-3. MAIN BOARD
4
2
 two claws
1
 screw (+BVTP2.6)
3
 two claws
cabinet (lower)
5
 MAIN board
POWER CORD AND POINTER INSTALLATION
5
2
 turn the knob (VOL)
     fully counterclockwise.
4
 turn RV1 fully
     counterclockwise.
MAIN board (top view)
lower cabinet (top view)
power cord
wind the power
cord clockwise
once.
3
 turn CV1 fully
     counterclockwise
     (bottom side).
1
 turn the knob (TUNE)
     fully counterclockwise.
7
ICF-C218
SECTION 3
ELECTRICAL ADJUSTMENTS
    AM Section      
0dB=1
µ
V
Procedure :
BAND
: AM
VOLUME
: 10mW
    FM Section
Procedure :
BAND
: FM
VOLUME
: 10mW
• Repeat the procedures in each adjustment several times, and
the frequency coverage and tracking adjustments should be
finally 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
CT1-4
1,750kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
620kHz
CT1-1
1,400kHz
FM FREQUENCY COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
86.5MHz
CT1-3
109.5MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
confirm
86.5MHz
CT1-2
109.5MHz
TUNER  SECTION
AM  RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
Put the lead-wire
antenna close to 
the set.
FM RF signal
generator
22.5kHz frequency deviation by 
400Hz signal.
Output level : as low as possible
antenna
terminal
TP1(RF IN)
0.01
µ
F
set
8 
Ω
speaker terminal
level meter
8
ICF-C218
Adjustment Location:  MAIN board (Component side)
L4
CT1-1-4
T1
L3
JW3
1
IC1
CT1-4 : AM Frequency Coverage Adjustment
L1 : AM Tracking Adjustment
TP1 (RF IN) (Conductor side)
CT1-3 : FM Frequency Coverage Adjustment
CT1-1-4
CT1-2 : FM Tracking Adjustment
CT1-1 : AM Tracking Adjustment
T1 : AM IF Adjustment
AM Frequency Coverage Adjustment
L3 : FM Frequency Coverage Adjustment
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