Sony ICF-CD843L Service Manual ▷ View online
SERVICE MANUAL
FM/MW/LW CD CLOCK RADIO
UK Model
SPECIFICATIONS
ICF-CD843L
Ver 1.0 2004.05
Model Name Using Similar Mechanism
ICF-CD853L
Optical Pick-up Block Name
KSM-213RDP
Optical Pick-up Name
KSS-213R
9-877-787-01
2004E05-1
© 2004.05
© 2004.05
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
Published by Sony Engineering Corporation
CD player section
System: Compact disc digital audio system
Laser diode properties:
Laser diode properties:
Material: GaAlAs
Wavelength: 780 nm
Emission duration: Continuous
Laser output: Less than 44.6 µW
(This output is the value measured at a distance of
about 200 mm from the objective lens surface on
the optical pick-up block with 7 mm aperture.)
Wavelength: 780 nm
Emission duration: Continuous
Laser output: Less than 44.6 µW
(This output is the value measured at a distance of
about 200 mm from the objective lens surface on
the optical pick-up block with 7 mm aperture.)
Frequency response: 20-20 000 Hz
+1
–1.5
dB
Wow and flutter: Below measurable limit
Radio section
Frequency range:
North and South America
North and South America
Band
Range
Channel step
FM
87.5-108 MHz
0.1 MHz
MW
530-1 610 kHz
10 kHz
Other countries/Regions
Band
Range
Channel step
FM
87.5-108 MHz
0.05 MHz
MW
531-1 602 kHz
9 kHz
LW
153-279 kHz
9 kHz
General
Time display:
12-hour system
Speaker:
66 mm (2
5
/
8
inches) dia., 4
Ω
Power outputs:
1.2 W + 1.2 W (at 10 % harmonic distortion)
Power requirements:
230 V AC, 50 Hz
Dimensions:
Approx. 185.5
× 176 × 210.5 mm (w/h/d)
(Approx.
7
3
/
8
× 7 × 8
3
/
8
inches) incl.
projecting parts and controls
Mass:
Approx. 1 870 g (4 lb 2 oz)
Design and specifications are subject to change
without notice.
without notice.
2
ICF-CD843L
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.
other than those specified herein may result in hazardous radiation
exposure.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK
0
OR DOTTED LINE
WITH MARK
0
ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
TABLE OF CONTENTS
1.
SERVICING NOTES
...............................................
3
2.
GENERAL
...................................................................
4
3.
DISASSEMBLY
3-1.
Disassembly Flow ...........................................................
5
3-2.
Rear Cabinet Assy ...........................................................
6
3-3.
CD Lid .............................................................................
6
3-4.
Upper Cabinet Assy .........................................................
7
3-5.
MAIN Board ....................................................................
7
3-6.
CD Block .........................................................................
8
3-7.
Optical Pick-up (KSS-213R) ...........................................
8
4.
ELECTRICAL ADJUSTMENTS
Tuner Section ...................................................................
9
CD Section ...................................................................... 11
5.
DIAGRAMS
5-1.
Block Diagram – CD Section – ...................................... 12
5-2.
Block Diagram – TUNER Section – .............................. 13
5-3.
Block Diagram – MAIN Section – ................................. 14
5-4.
Printed Wiring Board – CD Board – .............................. 16
5-5.
Schematic Diagram – CD Board – ................................. 17
5-6.
Printed Wiring Board – MAIN Board – ......................... 18
5-7.
Printed Wiring Boards – POWER Section – .................. 19
5-8.
Schematic Diagram – MAIN section (1/2) – .................. 20
5-9.
Schematic Diagram – MAIN section (2/2) – .................. 21
5-10. Printed Wiring Boards – PANEL Section – .................... 22
5-11. Schematic Diagram – PANEL Section – ........................ 23
5-11. Schematic Diagram – PANEL Section – ........................ 23
6.
EXPLODED VIEWS
6-1.
Cabinet Section ................................................................ 27
6-2.
Upper Cabinet Section ..................................................... 28
6-3.
Front Cabinet Section ...................................................... 29
6-4.
Rear Cabinet Section ....................................................... 30
6-5.
Optical Pick-up Section (KSM-213RDP) ....................... 31
7.
ELECTRICAL PARTS LIST
................................ 32
About CD-Rs/CD-RWs
This unit is compatible with CD-Rs/CD-RWs but
playback capability may vary depending on the
quality of the disc, the recording device and
application software.
This unit is compatible with CD-Rs/CD-RWs but
playback capability may vary depending on the
quality of the disc, the recording device and
application software.
3
ICF-CD843L
SECTION 1
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
CHECK
During normal operation of the equipment, emission of the laser
diode is prohibited unless the upper lid is closed while turning ON
the S302. (push switch type)
The following checking method for the laser diode is operable.
•
diode is prohibited unless the upper lid is closed while turning ON
the S302. (push switch type)
The following checking method for the laser diode is operable.
•
Method
Emission of the laser diode is visually checked.
Emission of the laser diode is visually checked.
1. Open the upper lid.
2. Push the S302 as shown in Fig.1.
2. Push the S302 as shown in Fig.1.
Note:
Do not push the detection lever strongly, or it may be bent or
damaged.
damaged.
3. Press the
CD
u
button.
4. Check the object lens for confirming normal emission of the
laser diode. If not emitting, there is a trouble in the automatic
power control circuit or the optical pick-up.
In this operation, the object lens will move up and down 2
times along with inward motion for the focus search.
power control circuit or the optical pick-up.
In this operation, the object lens will move up and down 2
times along with inward motion for the focus search.
CHUCK PLATE JIG ON REPAIRING
On repairing CD section, playing a disc without the CD lid, use
Chuck Plate Jig.
Chuck Plate Jig.
• Code number of Chuck Plate Jig: X-4918-255-1
S302
Fig.1 Method to push the S302
CF3
CF1
mark
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 CHANGED THE CERAMIC FILTERS
This model is used two ceramic filters of CF1 and CF3.
You must used same type of color marked ceramic filters in order to
meet same specifications.
Therefore, the ceramic filter must changed two pieces together since
it’s supply two pieces in one package as a spare parts.
You must used same type of color marked ceramic filters in order to
meet same specifications.
Therefore, the ceramic filter must changed two pieces together since
it’s supply two pieces in one package as a spare parts.
4
ICF-CD843L
SECTION 2
GENERAL
This section is extracted from
instruction manual.
instruction manual.
FM wire
antenna
antenna
AC power
cord
cord
The PRESET TUNING 3 button has a
tactile dot.
tactile dot.
There is a tactile dot
beside volume to show
the direction to turn up
the volume.
beside volume to show
the direction to turn up
the volume.
The CD u button has a tactile dot.
Features
¥ FM/MW/LW 3 band PLL (phase locked loop)
synthesized clock radio
¥ Easy preset digital tuning with 20 memory presets
¥ Built-in CD player with CD-R/RW playback
¥ Built-in CD player with CD-R/RW playback
function
¥ Easy to see large Display with small footprint.
¥ Triple Alarm (Radio, buzzer or CD) with the
¥ Triple Alarm (Radio, buzzer or CD) with the
extendable snooze function.
¥ Easy nap timer —one push operation.
¥ LCD with backlight which has a brightness control
¥ LCD with backlight which has a brightness control
switch.
¥ D.S.T. (Daylight Saving Time) —Summer time
calculation.
Setting the Clock
and Date
and Date
1
Plug in the clock radio.
The display will flash AM 12:00 .
2
Press CLOCK for a few seconds.
You will hear a beep and the year will start to
flash in the display.
flash in the display.
3
Press TUNE/TIME SET + or — until the
correct year appears in the display.
correct year appears in the display.
4
Press CLOCK once.
5
Repeat steps 3 and 4 to set the month, day,
hour, and minute.
hour, and minute.
After setting the minutes, press CLOCK to start
the clock, and you will hear two short beeps.
the clock, and you will hear two short beeps.
Setting the Brightness
of the Backlight
of the Backlight
Press BRIGHTNESS to select high, middle or low for
the display according to your preference.
the display according to your preference.
Setting the Alarm
This clock radio is equipped with 3 alarm modes
CD, radio and buzzer. Before setting the alarm, make
sure to set the clock (see Setting the Clock and
Date ).
CD, radio and buzzer. Before setting the alarm, make
sure to set the clock (see Setting the Clock and
Date ).
To Set the Alarm Time
To Set the CD Alarm:
For the CD alarm, the track you specified as the
Wake-up track is played first.
(If the CD play mode is set to SHUFFLE or
Wake-up track is played first.
(If the CD play mode is set to SHUFFLE or
SHUFFLE REP , however, all the tracks are played
in random order.)
1
With the alarm turned on, adjust the volume
to the level you require.
to the level you require.
2
Press ALARM SET CD for a few seconds.
ALARM , CD appear on the display.
After one beep, ALARM and the hour will start
to flash in the display.
to flash in the display.
3
Press TUNE/TIME SET + or — until the
desired hour appears.
desired hour appears.
To set the hour rapidly, hold down TUNE/TIME
SET +
SET +
or —.
4
Press ALARM SET CD.
The minute will flash.
5
Repeat step 3 to set the minute and press
ALARM SET CD.
ALARM SET CD.
The wake-up track number flashes on the display.
6
Press TUNE/TIME SET + or — to select
the desired wake-up track number.
the desired wake-up track number.
The wake-up track number can be set up to 99.
7
Press ALARM SET CD.
Two short beeps will confirm the setting.
To Set the Radio Alarm:
For the radio alarm, the station you specified as the
Wake-up station is played.
Wake-up station is played.
1
Tune into a station and adjust the volume.
2
Press ALARM SET RADIO for a few
seconds.
seconds.
ALARM and RADIO appear on the display.
After one beep, ALARM and the hour will start
to flash on the display.
to flash on the display.
3
Press TUNE/TIME SET + or — until the
desired hour appears.
desired hour appears.
To set the hour rapidly, hold down TUNE/TIME
SET +
SET +
or —.
4
Press ALARM SET RADIO.
The minute will flash.
5
Repeat step 3 to set the minute and press
ALARM SET RADIO.
ALARM SET RADIO.
WAKE UP STA appears and the preset number
flashes on the display.
6
Press TUNE/TIME SET + or — to select
the wake-up station.
the wake-up station.
Preset number changes in the order as follows:
P-
MW P1 to 5
FM1 P1 to 5
FM2 P1 to 5
LW P1 to 5
P— is the last received station.
You can directly select the desired wake-up
station by pressing RADIO¥BAND or the
PRESET TUNING
station by pressing RADIO¥BAND or the
PRESET TUNING
button while the indication
P— is not displayed.
7
Press ALARM SET RADIO.
Two short beeps will confirm the setting.
To Set the Buzzer Alarm:
1
1
Press ALARM SET BUZZER for a few
seconds.
seconds.
ALARM and BUZZER appear on the display.
After one beep, ALARM and the hour will start
to flash on the display.
to flash on the display.
2
Press TUNE/TIME SET + or — until the
desired hour appears.
desired hour appears.
To set the hour rapidly, hold down TUNE/TIME
SET +
SET +
or —.
3
Press ALARM SET BUZZER.
The minute will flash.
4
Repeat step 2 to set the minute and press
ALARM SET BUZZER.
ALARM SET BUZZER.
Two short beeps will confirm the setting.
To Set the Alarm Mode
Before setting the alarm mode, be sure to set the alarm
time. (See To Set the Alarm Time .)
Repeat the pressing of ALARM MODE to select the
alarm mode you want. Every time you press ALARM
MODE,
time. (See To Set the Alarm Time .)
Repeat the pressing of ALARM MODE to select the
alarm mode you want. Every time you press ALARM
MODE,
CD/RADIO/BUZZER indicator changes in
the order as follows:
CD
RADIO+
BUZZER
CD+
BUZZER
CD+RADIO
OFF
RADIO
BUZZER
CD+RADIO+
BUZZER
The alarm time which plays or sounds next is
displayed.
displayed.
To Check the Alarm Setting
For ALARM SET CD, pressing once displays the
alarm time, pressing twice displays the wake-up track
number.
For ALARM SET RADIO, pressing once displays
the alarm time, pressing twice displays the wake-up
station.
For ALARM SET BUZZER, pressing once displays
the alarm time.
The display shows the alarm setting for a few seconds
and then returns to the previous display.
alarm time, pressing twice displays the wake-up track
number.
For ALARM SET RADIO, pressing once displays
the alarm time, pressing twice displays the wake-up
station.
For ALARM SET BUZZER, pressing once displays
the alarm time.
The display shows the alarm setting for a few seconds
and then returns to the previous display.
Alarm time in CD alarm, radio alarm and buzzer alarm
is set at AM 12:00 when you purchased the unit.
is set at AM 12:00 when you purchased the unit.
ALARM ON—
If you set the CD alarm and there is no disc in the CD
player, the buzzer alarm will sound in its place at the
time set.
player, the buzzer alarm will sound in its place at the
time set.
For the buzzer alarm, the beeping of the alarm
becomes more rapid after every few seconds in three
progressive stages.
becomes more rapid after every few seconds in three
progressive stages.
Note
When CD, radio and buzzer alarms are set for the
same time, the CD alarm takes precedence. If the CD
alarm is not set, the radio alarm takes precedence.
When CD, radio and buzzer alarms are set for the
same time, the CD alarm takes precedence. If the CD
alarm is not set, the radio alarm takes precedence.
To Doze for a Few More Minutes
Press SNOOZE¥DATE/SLEEP OFF.
The CD, radio or buzzer alarm turns off but will be
automatically activated again after about 10 minutes.
Every time you press SNOOZE¥DATE/SLEEP
OFF
The CD, radio or buzzer alarm turns off but will be
automatically activated again after about 10 minutes.
Every time you press SNOOZE¥DATE/SLEEP
OFF
, the snooze time changes as follows:
20
10
30
40
50
60
The display shows the snooze time for a few seconds
and returns to show the current time. When you press
SNOOZE¥DATE/SLEEP OFF
and returns to show the current time. When you press
SNOOZE¥DATE/SLEEP OFF
after the current time
appears, the snooze time starts from 10 minutes again.
The maximum length of the snooze time is 60 minutes.
ALARM OFF—
The CD, radio, or buzzer alarm is turned off
automatically after 60 minutes.
automatically after 60 minutes.
To Stop the Alarm
Press OFF x¥ALARM RESET to turn off the alarm.
The alarm will come on again at the same time the
next day.
The alarm will come on again at the same time the
next day.
To Deactive the Alarm
Press ALARM MODE repeatedly until CD/RADIO/
BUZZER indicator go off.
BUZZER indicator go off.
Setting the Sleep
Timer
Timer
You can fall asleep to the CD or the radio using the
built-in sleep timer to turn off the CD or the radio
automatically after a preset duration.
built-in sleep timer to turn off the CD or the radio
automatically after a preset duration.
Press SLEEP during CD or radio play.
You can set the sleep timer to durations of 90, 60, 30,
or 15 minutes. Every push changes the display as
follows:
You can set the sleep timer to durations of 90, 60, 30,
or 15 minutes. Every push changes the display as
follows:
off
(current time)
30
15
60
90
SLEEP will appear in the display when the duration
time is set.
The CD or the radio will play for the time you set,
then shut off.
The CD or the radio will play for the time you set,
then shut off.
To turn off the CD or the radio before the preset time,
press SNOOZE¥DATE/SLEEP OFF.
press SNOOZE¥DATE/SLEEP OFF.