ICF-CD855, ICF-CD855L — Sony Audio Service Manual (repair manual)

Model
ICF-CD855 ICF-CD855L
Pages
54
Size
2.6 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
icf-cd855-icf-cd855l.pdf
Date

View Sony ICF-CD855 / ICF-CD855L Service Manual online

SERVICE MANUAL
ICF-CD855
FM/AM CD CLOCK RADIO
ICF-CD855L
FM/MW/LW CD CLOCK RADIO
Canadian Model
Italian Model
ICF-CD855
AEP Model
UK Model
ICF-CD855L
SPECIFICATIONS
ICF-CD855/CD855L
Ver. 1.1  2009.11
9-877-570-02
Sony Corporation
2009K05-1
Audio&Video Business Group
C
 2009.11
Published by Sony Techno Create Corporation
Model Name Using Similar Mechanism
ICF-CD73
Optical Pick-up Block Name
KSM-900AAA
Optical Pick-up Name
KSS-900A
CD player section
System:
 Compact disc digital audio system
Laser diode properties:
Material: GaAlAs
Wavelength: 780 nm
Emission duration: Continuous
Laser output: Less than 44.6  W
(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:
Model for Canadian
Band
ICF-CD855
Channel step
FM
87.5 - 108 MHz
0.1 MHz
AM
530 - 1 710 kHz
10 kHz
Model for exept Canadian
Band
ICF-CD855
ICF-CD855L
Channel
step
FM
87.5 - 108 MHz
87.5 - 108 MHz 0.05 MHz
AM
531 - 1 611 kHz 531 - 1 611 kHz 9 kHz
(MW)
LW
153 - 279 kHz
3 kHz
General
Time display:
Canadian and UK models: 12-hour system
AEP and Italian models: 24-hour system
Speaker: 
50 mm (2 inches) dia., 8 
Outputs:
i (headphones) jack (
stereo minijack)
Power outputs:
1 W + 1 W (at 10% harmonic distortion)
Power requirements:
North and South American model:
120 V AC, 60 Hz
Other models:
230 V AC, 50 Hz
Dimensions:
Approx. 169 
× 165 × 217 mm (w/h/d)
(Approx. 6 
3
/
4
 × 6 
1
/
2
 
× 8 
5
/
8
 inches) incl.
projecting parts and controls
Mass:
Approx. 1 700 g (3 lb. 12 oz.)
CD855L: UK model:
Approx. 1 750 g (3 lb. 14 oz.)
Design and specifications are subject to change
without notice.
 3.5 mm
Photo: ICF-CD855
2
ICF-CD855/CD855L
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 soft-
ware.
ATTENTION  AU  COMPOSANT  AYANT  RAPPORT
À  LA  SÉCURITÉ!
LES  COMPOSANTS  IDENTIFIÉS  PAR  UNE  MARQUE  
0
SUR  LES  DIAGRAMMES  SCHÉMATIQUES  ET  LA  LISTE
DES  PIÈCES  SONT  CRITIQUES  POUR  LA  SÉCURITÉ
DE  FONCTIONNEMENT.  NE  REMPLACER  CES  COM-
POSANTS  QUE  PAR  DES  PIÈCES  SONY  DONT  LES
NUMÉROS  SONT  DONNÉS  DANS  CE  MANUEL  OU
DANS  LES  SUPPLÉMENTS  PUBLIÉS  PAR  SONY.
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  PUB-
LISHED  BY  SONY.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C dur-
ing repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 ˚C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 ˚C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges oc-
cur such as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
3
ICF-CD855/CD855L
TABLE  OF  CONTENTS
1.
SERVICING  NOTES
..............................................
3
2.
GENERAL
..................................................................
4
3.
DISASSEMBLY
3-1. Disassembly Flow ...........................................................
5
3-2. Cabinet (Rear) Block ......................................................
5
3-3. Cabinet (Upper) Block ....................................................
6
3-4. CD Board .........................................................................
6
3-5. Optical Pick-up Block (KSM-900AAA) ........................
7
3-6. Optical Pick-up (KSS-900A) ..........................................
7
3-7. MAIN Board ...................................................................
8
3-8. Speaker (SP101/SP201) ..................................................
9
3-9. CD Lid Block ..................................................................
9
4.
TEST MODE
.............................................................. 10
5.
ELECTRICAL  ADJUSTMENTS
........................ 13
6.
DIAGRAMS
6-1. Block Diagram  – CD Section – .................................... 16
6-2. Block Diagram  – TUNER Section – ............................ 17
6-3. Block Diagram  – MAIN Section – ............................... 18
6-4. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 19
6-5. Printed Wiring Board  – CD Section  – ......................... 20
6-6. Schematic Diagram  – CD Section – ............................. 21
6-7. Printed Wiring Board
– TUNER Section (ICF-CD855) – ................................ 22
6-8. Schematic Diagram
– TUNER Section (ICF-CD855) – ................................ 23
6-9. Printed Wiring Board
– TUNER Section (ICF-CD855L) – .............................. 24
6-10. Schematic Diagram
– TUNER Section (ICF-CD855L) – .............................. 25
6-11. Printed Wiring Boards  – PANEL Section – ................. 26
6-12. Printed Wiring Boards  – MAIN Section – ................... 27
6-13. Schematic Diagram  – MAIN Section (1/2) – ............... 28
6-14. Schematic Diagram  – MAIN Section (2/2) – ............... 29
7.
EXPLODED  VIEWS
7-1. Overall Section ................................................................ 35
7-2. Cabinet (Rear) Block Section ......................................... 36
7-3. CD Lid Section ................................................................ 37
7-4. LCD Section .................................................................... 38
7-5. Cabinet (Upper) Section ................................................. 39
7-6. KEY Board Section ......................................................... 40
7-7. Cabinet (Lower) Block Section ...................................... 41
7-8. Speaker Section ............................................................... 42
7-9. Optical Pick-up Section (KSM-900AAA) ..................... 43
8.
ELECTRICAL  PARTS  LIST
.............................. 44
The laser diode in the optical pick-up block may suffer electro-
static 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 emis-
sion, observe from more than 30 cm away from the objective lens.
SECTION  1
SERVICING  NOTES
NOTES  ON  HANDLING  THE  OPTICAL  PICK-UP
BLOCK  OR  BASE  UNIT
• In performing the repair with the power supplied to the set, re-
moving the MAIN board causes the set to be disabled.
In such a case, short between 1 and 2 pins of the W604 on the
MAIN board using a lead wire.
2 1
– MAIN Board (Conductor Side) –
W604
4
ICF-CD855/CD855L
SECTION  2
GENERAL
This section is extracted from
instruction manual.
RADIO
SLEEP
FM1FM2
LW
AM
MWPM
FM MONO
AM
SHUFFLE
REP 1 ALL
WAKE UP
TRACK
VOL
CD
PM
MHz
kHz
ALARM A
ALARM B
NAP
AM
PM
CD
RADIO
BUZZER
ALARM B
NAP
SLEEP
RADIO ON
BAND
ALARM
RESET
CD
OFF
TUNE
TIME SET
CD
RADIO
BUZZER
ALARM A
1
SELECT
PRESET
PUSH OPEN
A
PRESET TUNING
2
3
4
5
VOL
MODE
HI
BRIGHTNESS
CLOCK
MID
LOW
The PRESET TUNING 3 button
has a tactile dot.
(headphones)
jack
FM wire antenna
AC power cord
Cordon
The VOL + button has a tactile dot.
The CD 
u
 button has a tactile dot.
Display window* (12-hour system)
* The display differs depending on your country.
SNOOZE•SLEEP OFF
PUSH CLOSE
Features
FM/AM 2 band (ICF-CD855) or FM/MW/LW 3
band (ICF-CD855L) PLL (phase locked loop)
synthesized clock radio
Easy preset digital tuning with 15 memory presets
for ICF-CD855, 20 memory presets for ICF-
CD855L
Built-in CD player with CD-R/RW playback
function
Dual alarm
Triple time display 
− main display for the clock, and
two alarm sub 
− displays
Nap timer 
− count down timer (10, 20, 30, 60, 90,
120 minutes)
Extendable Snooze time from 10 to 60 minutes
LCD with brightness adjustment backlight (High/
Middle/Low)
Setting the Brightness
of the Backlight
Slide 
BRIGHTNESS
 to select HI (high), MID
(middle) or LOW for the display according to your
preference.
Setting the Clock
1
Plug in the clock radio.
The display will flash  AM 12:00  or  0:00 .
2
Press 
CLOCK
 for a few seconds.
You will hear a beep and the hour will start to
flash in the display.
3
Press 
TUNE•TIME SET +
 or 
− until the
correct hour appears in the display.
4
Press 
CLOCK
 once.
You can set the minutes in the same way as the
hour.
After setting the minutes, press 
CLOCK
 to start
the clock, and you will hear two short beeps.
To set the current time rapidly, hold down
TUNE•TIME SET +
 or 
−.
The clock system varies depending on the model you
own.
12-hour system:  AM 12:00  = midnight
24-hour system:  0:00  = midnight
In step 
4
, when you press 
CLOCK
 after the minute
setting to activate the clock, the seconds  start
counting from zero.
Notes
The clock setting will be cancelled if you press
OFF
 x
• ALARM RESET
 while setting the clock.
If you do not press a button for about 1 minute
while setting the clock, the clock setting will be
cancelled.
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 ).
To Set the Alarm Time
1
Press 
ALARM A
 or 
B
 for a few seconds.
After one beep,  ALARM  and the hour will flash
on the display.
2
Press 
TUNE•TIME SET +
 or 
− until the
desired hour appears.
To set the hour rapidly, hold down 
TUNE•TIME
SET +
 or 
−.
3
Press 
ALARM A
 or 
B
.
After one beep, the minutes will flash.
4
Repeat step 
2
 to set the minutes and press
ALARM A
 or 
B
.
After one beep, the alarm mode is entered.
5
Press 
TUNE•TIME SET +
 or 
− until the
desired alarm indicator flashes.
You can choose one mode among  CD,
RADIO  and  BUZZER.  Set the alarm mode as
follows:
− CD: see  A Setting the CD Alarm.
− RADIO: see  B Setting the Radio Alarm.
− BUZZER: see  C Setting the Buzzer Alarm.
A
 Setting 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
SHUFFLE REP,  however, all the tracks are played
in random order.)
1
Perform steps 
1
 to 
5
 in  To set the Alarm
Time.
2
Press 
ALARM A
 or 
B
 to select  CD  alarm
mode.
After one beep,  WAKE UP TRACK  appears on
the display.
3
Press 
TUNE•TIME SET +
 or 
− to select
the desired wake-up track number.
4
Press 
ALARM A
 or 
B
.
After one beep,  WAKE UP VOLUME  will
flash.
5
Press 
TUNE•TIME SET +
 or 
− to adjust
the volume.
You can also adjust the volume using 
VOL +
 or 
−.
6
Press 
ALARM A
 or 
B
.
Two short beeps will confirm the setting. If the
CD indicator does not light, press 
ALARM A
 or
B
 to light the CD indicator, and the CD will start
at the set time.
B
 Setting the Radio Alarm
For the radio alarm, the station you specified as the
wake-up station is played.
1
Perform steps 
1
 to 
5
 in  To set the Alarm
Time.
2
Press 
ALARM A
 or 
B
 to select  RADIO
alarm mode.
WAKE UP STATION  appears and the preset
number flashes on the display.
3
Press 
TUNE•TIME SET +
 or 
− to select
the desired wake-up station.
Preset number changes in the order as follows:
ICF-CD855
P
AM P1 to 5
FM1 P1 to 5
FM2 P1 to 5
ICF-CD855L
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 ON•BAND
 or the
PRESET TUNING 
button while the indication
P
−  is not displayed.
4
Press 
ALARM A
 or 
B
.
After one beep,  WAKE UP VOLUME  will
flash.
5
Press 
TUNE•TIME SET +
 or 
− to adjust
the volume.
You can also adjust the volume using 
VOL +
 or 
−.
6
Press 
ALARM A
 or 
B
.
Two short beeps will confirm the setting. If the
RADIO indicator does not light, press 
ALARM A
or 
B
 to light the RADIO indicator, and the radio
will start at the set time.
C
 Setting the Buzzer Alarm
1
Perform steps 
1
 to 
5
 in  To set the Alarm
Time.
2
Press 
ALARM A
 or 
B
 to select  BUZZER
alarm mode.
Two short beeps will confirm the setting. If the
BUZZER indicator does not light, press 
ALARM
A
 or 
B
 to light the BUZZER indicator, and the
buzzer will sound at the set time.
ALARM ON
Press 
ALARM A
 or 
B
 to activate the alarm setting.
If the setting indicator does not light, the alarm setting
is not activated. You can only check the alarm setting
when it is activated.
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.
For the alarm, the beeping of the alarm becomes more
rapid after every few seconds in three progressive
stages.
When headphones (not supplied) are plugged into the
unit, the alarm will not sound through the speakers
regardless of the alarm mode setting.
Note
When Alarm A and Alarm B are set for the same
time, the Alarm A takes precedence.
To Doze for a Few More Minutes
Press 
SNOOZE•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•SLEEP OFF
, the
snooze time changes as follows:
10 
20
50
60
30
40
The display shows the snooze time for a few seconds
and returns to show the current time. When you press
SNOOZE•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
Press 
ALARM A
 or 
B
 to deactivate the alarm setting.
The CD, radio, or buzzer alarm is turned off
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.
Setting the Sleep
Timer
You can fall asleep to the radio using the built-in
sleep timer to turn off the CD or the radio automati-
cally 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:
SLEEP  will appear in the display when the duration
time is set.
The radio will play for the time you set, then shut off.
When the sleep timer reaches a remaining time of a
few minutes,  SLEEP  will flash in the display and
the sound output will gradually decrease in volume
(Gentle Sleep function).
If you press 
VOL +
 or 
− at this time,  SLEEP  will
light up and the decrease in the volume will stop.
To turn off the CD or the radio before the preset time,
press 
SNOOZE•SLEEP OFF
.
Page of 54

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  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).