ICF-18 - Sony Audio Service Manual (repair manual)

icf-18 service manual
Model
ICF-18
Pages
8
Size
343.14 KB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
icf-18.pdf
Date

Read Sony ICF-18 Service Manual online

FM/AM RADIO
US Model
Canadian Model
AEP Model
UK Model
E Model
SPECIFICATIONS
SERVICE MANUAL
ICF-18
SECTION  1
GENERAL
This section is extracted from
instruction manual.
9-925-741-13
2008J05-1
© 2008.10
Sony Corporation
Audio&Video Business Group
Published by Sony Techno Create Corporation
Ver. 1.2  2008.10
– 2 –
Note:
 Follow the disassembly procedure in the numerical order given.
CABINET (REAR)
SECTION  2
DISASSEMBLY
KNOB (VOL), KNOB (TUNE)
1
 Remove the battery case lid
to direction of the arrow.
2
 two screws
(P 3 
×
 14)
4
 cabinet (rear)
6
 lug
5
 screw
(P 3 
×
 10)
3
 three claws
1
 two claws
1
 two claws
2
 knob (tune)
2
 knob (vol)
knob (tune)
screw
driver
knob (vol)
screw
driver
– 3 –
– 4 –
Note:
 Follow the assembly procedure in the numerical order given.
SECTION  3
DIAL  POINTER  SETTING
1
 Slide the pointer
to the inner part.
2
 Turn the VC gear
fully in the arrow 
B
direction.
3
 Insert the pointer to the gear
fitting the concave position
of the pointer to the convex
position of the gear.
pointer
A
Note: When take off the pointer,
remove to direction of the arrow 
A
.
B
SECTION  4
ELECTRICAL  ADJUSTMENTS
[AM Section]
Setting:
Band select switch: AM
0dB=1 
µ
V
[FM Section]
Setting:
Band select switch: FM
Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally done
by the trimmer capacitors.
FM RF SSG
±
 22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
+
level meter
earphone jack
set
FM antenna terminal
AM RF SSG
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to 
the set.
+
level meter
earphone jack
set
FM  FREQUENCY  COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
75.0 MHz
CT1
109.5 MHz
FM  TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
75.0 MHz
CT2
109.5 MHz
AM  FREQUENCY  COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
520 kHz
CT3
1,650 kHz
AM  TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
600 kHz
CT4
1,400 kHz
AM  IF  ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455 kHz
Adjustment Location: MAIN board (Component Side)
AM FREQUENCY
COVERAGE
CT3    L4
CT1
L3
FM FREQUENCY
COVERAGE
FM
antenna
terminal
L1
CT4
AM
TRACKING
T1
AM IF
L2    CT2
FM TRACKING
IC1
S1
(
BAND SELECT
)
SWITCH
FM
AM
OFF
JW4
CF2
CF3
mark
– 5 –
– 6 –
ICF-18
SECTION  5
DIAGRAMS
5-1.
SCHEMATIC  DIAGRAM
5-2.
PRINTED  WIRING  BOARDS
Mark
Center frequency
red
10.70 MHz
blue
10.67 MHz
orange
10.73 MHz
black
10.64 MHz
white
10.76 MHz
HOW TO CHANGE THE CERAMIC FILTERS
This model is used two ceramic filters of CF2, CF3.
You must use same type of color marked ceramic filters in order to
meet same specifications.
Therefore, the ceramic filter must change two pieces together since
it's supply two pieces in one package as a spare parts.
• IC Block Diagram
IC1
CXA1019S
1
2
3
4
5
6
7
8
9
10
15
14
13
12
11
FM
DISCRIMINATOR
AF POWER AMP
AM FE
FM IF
TUNING
METER
AM IF DET AGC
FM FE
23
22
21
20
24
25
19
18 17 16
29 28 27 26
30
GND
GND
AF OUT
VCC
RIPPLE
FIL
TER
AF IN
DET OUT
AFC AGC
AFC AGC
IF GND
METER
N.C
FM IF IN
AM IF IN
FM/AM BAND
SELECT
FM/AM
IF OUT
N.C
FE GND
AM RF IN
FM RF
REG OUT
FM OSC
FM RF IN
AFC
AM OSC
VOL
NF
FM DISCRI
GND
GND
Note on Schematic Diagram:
All capacitors are in 
µ
F unless otherwise noted.  pF: 
µµ
F 50
WV or less are not indicated except for electrolytics and
tantalums.
All resistors are in 
  and 
1
/
4
 
W or less unless otherwise
specified.
¢
: internal component.
: panel designation.
: B+ Line.
: adjustment for repair.
Power voltage is dc 3 V and fed with regulated dc power
supply from battery terminal.
Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : FM
(
) : AM
[
] : FM/AM
Voltages are taken with a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal production
tolerances.
Signal path.
: FM
Note on Printed Wiring Board:
: parts extracted from the component side.
p
: parts mounted on the conductor side.
¢
: internal component.
: Pattern from the side which enables seeing.
Page of 8
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Download Sony ICF-18 Service Manual (Repair Manual)

Here you can read online and download Sony ICF-18 Service Manual in PDF. ICF-18 service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony ICF-18 Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.