DOWNLOAD Sony ICF-C490 / ICF-CD863 / ICF-CD863L Service Manual ↓ Size: 661.06 KB | Pages: 16 in PDF or view online for FREE

Model
ICF-C490 ICF-CD863 ICF-CD863L
Pages
16
Size
661.06 KB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
icf-c490-icf-cd863-icf-cd863l.pdf
Date

Sony ICF-C490 / ICF-CD863 / ICF-CD863L Service Manual ▷ View online

3
ICF-C490
SECTION  1
GENERAL
This section is extracted from
instruction manual.
SNOOZE
BUZZER
TIME SET
RADIO
ALARM
ALARM
RESET
HOLD
RADIO BUZZER
CLOCK
OFF
RADIO BUZZER
RADIO+BUZZER
ALARM MODE
ALARM TIME/CLOCK SET
BUZZER VOLUME
BRIGHTNESS
LOW          HIGH
FAST
SLEEP
FAST
RADIO
ON
RADIO
OFF
BAND
VOL
TUNING
AM    FM
AC power cord
Cordon d’alimentation
secteur
Netzkabel
FM wire antenna
Fil d’antenne FM
UKW-Wurfantenne
Indicator
Indicateurs
Anzeige
Stand
Support
Ständer
There is a tactile dot beside volume to show the
direction to turn up the volume.
Un point tactile, situé à côté de la molette de volume,
indique le sens dans lequel il faut tourner pour
augmenter le volume.
Neben dem Lautstärkeregler befindet sich ein
fühlbarer Punkt. Dieser gibt die Richtung an, in der
man die Lautstärke erhöht.
A
Setting the Clock
To control the visibility of the display, set
BRIGHTNESS for the display to HIGH or LOW
according to your preference.
1
Plug in the clock radio.
The display will flash “AM 12:00” or “0:00”.
2
Set the ALARM TIME/CLOCK SET
switch to CLOCK.
3
Press FAST+FAST– or + to adjust the
time.
When you press FAST+, the time is raised
rapidly.
When you press FAST–, the time is lowered
rapidly.
When you press +, the time is raised in one-
minute steps.
4
Set the ALARM TIME/CLOCK SET
switch to HOLD.
Make sure that the ALARM TIME/CLOCK SET
switch is set to HOLD. When it is set to HOLD,
you cannot see the red label underneath.
Otherwise, the displayed time might be
changed if FAST+FAST– or + happens to be
pressed.
The clock system varies depending on the model
you own.
12-hour system: “AM 12:00”=midnight
24-hour system: “0:00”=midnight
To display minute and second, press SNOOZE.
Example: When the current time is 7:15:10, the
display will become:
7
 
:15
 ,
 
5
 
:10
Lower of minute digit Second digits
The display returns to the current time when you
release SNOOZE.
To adjust the time exactly to the second, press +
briefly with the time signal.
ICF-C490
4
• This set can be disassembled in the order shown below.
2-1.
DISASSEMBLY  FLOW
SECTION  2
DISASSEMBLY
Note:
 Follow the disassembly procedure in the numerical order given.
2-2.
CABINET (UPPER)  ASSY
3
screw (P3 
×
 14)
S101
1
cap (R)
4
screw (P3 
×
 30)
2
screw (P3 
×
 30)
1
cap (L)
2
screw (P3 
×
 30)
S102
5
cabinet (upper) assy
knob (alarm)
knob (clock)
Note : When installing 
cabinet (upper) assy,
adjust S102, S101 and 
the knobs (clock, alarm).
SET
2-2. CABINET (UPPER) ASSY
(page 4)
2-3. MAIN BOARD
(page 5)
ICF-C490
5
2-3.
MAIN  BOARD
MAIN  BOARD  SETTING
1
knob (band)
qs
claw
3
2
screw (P3 
×
 14)
qd
main board
6
speker (6.6 cm) (SP1)
5
LED board
9
washer
8
two screws 
(P3 
×
 14)
7
screw 
(PTPWH3 
×
 8)
qa
power cord (PC1)
0
power board
9
washer
4
antenna (wire) (W7)
knob (vol)
knob (tuning)
B
A
RV1
shaft of CV1
Note 1 : When installing the main board,
adjust RV1 and the knob (vol).
Note 2 : When installing the main board,
turn the shaft of CV1 in the direction 
of arrow 
A
 fully and the knob (tuning)
in the direction of arrow 
B
 fully 
before adjusting the shaft of CV1 
and the knob (tuning).
6
ICF-C490
0 dB = 1 
µ
V
[AM]
Setting:
BAND switch: AM
[FM]
Setting:
BAND 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.
• Remove FM antenna in FM adjustments.
Adjustment Location: MAIN board (See page 7)
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
+
level meter
MAIN board 
TP (SP –)
MAIN board 
TP (SP +)
set
MAIN board
TP (FM ANT)
0.01 
µ
F
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
455 kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L4
515 kHz
CT1-4
1,750 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
600 kHz
CT1-1
1,400 kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L3
86.5 MHz
CT1-3
109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L-2
86.5 MHz
CT1-2
109.5 MHz
SECTION  3
ELECTRICAL  ADJUSTMENTS
AM RF signal 
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to 
the set.
+
level meter
set
MAIN board 
TP (SP –)
MAIN board 
TP (SP +)
Page of 16
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Sony ICF-C490 / ICF-CD863 / ICF-CD863L Service Manual ▷ Download

  • DOWNLOAD Sony ICF-C490 / ICF-CD863 / ICF-CD863L Service Manual ↓ Size: 661.06 KB | Pages: 16 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sony ICF-C490 / ICF-CD863 / ICF-CD863L in PDF for free, which will help you to disassemble, recover, fix and repair Sony ICF-C490 / ICF-CD863 / ICF-CD863L Audio. Information contained in Sony ICF-C490 / ICF-CD863 / ICF-CD863L Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.