Sony ICF-C240 User Manual

SECTION 1
ELECTRICAL ADJUSTMENTS
FM Section AM Section oii
SERVICE
MANUAL
AEP
Model
isi
=
[-~}H
Pz)
antenna close to
ww the set,
3
ICF-C240
TIME SET-M button. ALARM button speaker terminal
[1 semen
TIME
SET-H
button-
SLEEP
button
‘00H,
80%
@
Repeat
the
procedures
in
each
adjustment
CLOCK
button.
REPEAT
ALARM/
AM
modulation
several
times,
and
the
frequency
coverage
and
SPEER
OFF
button
s2askiis
frequency
Output
level
as
tow
as
possbte
tracking
adjustments
should
be
finally
done
by
output level :as low as possible the trimmer capacitors,
ALARM
(RADIO/BUZZER)
Ne
Band
(FM/AM)
selector
FM
FREQUENCY
AM_IF
ALIGNMENT
VOL
(volume)
control
COVERAGE
ADJUSTMENT
Adjust
for
a
maximum
reading
TUNING
control
|
‘Adjust
for
a
maximum
reading
on
VTVM.
|
on
VTVM,
12
i
L4
87.35(87.3)MHz
455kHz
{ cT2
108.05(108.3)
MHz
\
AM
FREQUENCY
SPECIFICATIONS
FM
TRACKING
ADJUSTMENT
COVERAGE
ADJUSTMENT
Frequency
range
FM
AM
MAIN
BOARD
REMOVAL
Adjust
for
a
maximum
reading
Adjust
for
a
maximum
reading
AEP
model
|
87.6—107.5MHz
|
531—1,602kHz
o
Turn
TUNING
knob
fully
clockwise.
coy)
on
VTVM
IT
model |
87.5—108MHz
526.5—1,606.5kHz
e
R
4B
2.6X5
s
LS,
L6
87.35(87.3)MHz
13
520(516.5)kHz
einoveiscrew
(48.26%)
Ct
108.05
(108.3)
MHz
crt
1,650(1,631.5)kHz
Antenna
FM:
AC
power
cord
antenna
©
Release
fook,
(_):IT
model
Seu
ye
Lae
ere
esl
de
©
Remove
main
board
pressing
down
TUNING
knob.
speaker
pprox.
6.6
cm
(27,
inches)
dia.
¢
"
a
i
[AM
TRACKING
ADJUSTMENT]
Power
output
100mW
(at
10%
harmonic
distortion)
Note:
When
installing
main
board,
align
shaft
of
VOL
knob
AM
TRACKING
ADJUSTMENT.
Power
requirement
220V
AC,
50H2
with
a
hole
of
adjustable
resistor.
‘Adjust
for
a
maximum
reading
For
the
power
backup
function:
on
VTVM,
9V DC,
one
6F
22
battery
Battery
life
Approx.
80
hours,
using
Sony
battery
S-O06P
(U)
°
EL
S20kHz
Dimensions
Approx.
181.5x59x144mm (w/h/d)
CT3
1,400kHz
(7.x
2%
x54, inches)
ae
incl.
projecting
ports
and
controls.
Weight
Approx.
520g
(1
Ib
302)
it
incl.
batt
te
.
not
inch
battery
alle
BOAR
[MAIN
BOARD]
-
component
side
-
Design
and
specifications
subject
to
change
without
notice
|
adjustable
i
resistor
FEATURES
* Electronic digital alarm clock and sleep timer are combined.
+ Two wake-up modes available: radio or buzzer alarm.
* REPEAT ALARM bar, operable with a feather-light touch, offers
two functions: snooze alarm and sleep timer turn off.
* Power back-up function to keep the clock operating during a
power interruption, using an optional 6F22 battery.
VOL knob |
@ TuNING KNos |
SAFETY-RELATED COMPONENT WARNING!!
|
|
&
COMPONENTS IDENTIFIED BY MARK /\ OR DOTTED @ screw
LINE WITH MARK \ ON THE SCHEMATIC DIAGRAMS +8 265
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
tas oaeenmemmseen FM/AM DIGITAL CLOCK RADIO

Sony ICF-C240 Specifications

General

Type	Clock Radio
Tuner Bands	AM/FM
Display	LED
Snooze Function	Yes
Power Source Voltage	120V AC
Power Source	AC
Alarm Type	Radio or Buzzer

Summary

SECTION 1 ELECTRICAL ADJUSTMENTS

FM FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on VTVM for FM frequency coverage.

AM IF ALIGNMENT

Adjust for a maximum reading on VTVM for AM intermediate frequency.

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on VTVM for FM tracking.

AM FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on VTVM for AM frequency coverage.

AM TRACKING ADJUSTMENT

Adjust for a maximum reading on VTVM for AM tracking.

MAIN BOARD REMOVAL

SECTION 2 DIAGRAMS

2-1. PRINTED WIRING BOARDS

Diagrams showing the physical layout of components on the printed circuit boards.

IC Block Diagram

Functional block diagram illustrating the integrated circuits and their connections.

Semiconductor Location

Identifies the specific locations of semiconductor components on the circuit board.

2-2. SCHEMATIC DIAGRAM

Semiconductor Lead Layouts

Illustrates the lead pin configurations for various semiconductor components.

SECTION 3 EXPLODED VIEW

SECTION 4 ELECTRICAL PARTS LIST

CAPACITORS

List of capacitors with part numbers, values, and specifications.

RESISTORS

List of resistors with part numbers, values, and specifications.

TRANSFORMER, POWER

Details for the power transformer component.

ACCESSORY & PACKING MATERIAL

List of accessories and packing materials included with the unit.