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SERVICE MANUAL
TV/WEATHER/FM/AM CD CLOCK RADIO
US Model
SPECIFICATIONS
ICF-CD855V
Ver 1.0 2004.02
9-877-569-01
Sony Corporation
2004B05-1
Personal Audio Company
C
2004.02
Published by Sony Engineering Corporation
Model Name Using Similar Mechanism
ICF-CD73V
Optical Pick-up Block Name
KSM-900AAA
Optical Pick-up Name
KSS-900A
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC
DISTORTION
With 8­ohm loads, both channels driven from
100 ­ 10 000 Hz; rated 1.0 W per channel-minimum
RMS power, with no more than 10% total harmonic
distortion in AC operation.
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
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:
TV:
2 ­ 13 ch
WEATHER: 1 ­ 7 ch
FM:
87.5 ­ 108 MHz
AM:
530 ­ 1 710 kHz
General
Time display:
12-hour system
Speaker:
50 mm (2 inches) dia., 8
Outputs: i
(headphones) jack (ø 3.5 mm
stereo minijack)
Power outputs:
1 W + 1 W (at 10% harmonic distortion)
Power requirements:
120 V AC, 60 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)
Design and specifications are subject to change
without notice.


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ICF-CD855V
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.
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.
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, "metallized" knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers' instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The "limit" indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able. (See Fig. A)
Fig. A.
Using an AC voltmeter to check AC leakage.
1.5 k
0.15
µF
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
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.


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ICF-CD855V
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 Boards ­ CD Section ­ ....................... 20
6-6. Schematic Diagram ­ CD Section ­ ............................. 21
6-7. Printed Wiring Board ­ TUNER Board ­ ..................... 22
6-8. Schematic Diagram ­ TUNER Board ­ ....................... 23
6-9. Printed Wiring Boards ­ PANEL Section ­ ................. 24
6-10. Printed Wiring Board ­ MAIN Section ­ ..................... 25
6-11. Schematic Diagram ­ MAIN Section (1/2) ­ ............... 26
6-12. Schematic Diagram ­ MAIN Section (2/2) ­ ............... 27
7.
EXPLODED VIEWS
7-1. Overall Section ................................................................ 33
7-2. Cabinet (Rear) Block Section ......................................... 34
7-3. CD Lid Section ................................................................ 35
7-4. LCD Section .................................................................... 36
7-5. Cabinet (Upper) Section ................................................. 37
7-6. KEY Board Section ......................................................... 38
7-7. Cabinet (Lower) Block Section ...................................... 39
7-8. Speaker Section ............................................................... 40
7-9. Optical Pick-up Section (KSM-900AAA) ..................... 41
8.
ELECTRICAL PARTS LIST .............................. 42
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


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ICF-CD855V
SECTION 2
GENERAL
This section is extracted from
instruction manual.
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".
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 ­.
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.
RADIO
SLEEP
WEATHER
FM1FM2
TVAM
PM
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
PUSH OPEN
A
PRESET TUNING
2
3
4
5
MODE
HI
BRIGHTNESS
CLOCK
MID
LOW
SELECT
PRESET
VOL
FM wire
antenna
AC power cord
i
(headphones)
jack
The PRESET TUNING 3 button has a tactile dot.
The VOL + button has a tactile dot.
The CD u button has a tactile dot.
SNOOZE·SLEEP OFF
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:
P-
AM P1 to 5
FM1 P1 to 5
FM2 P1 to 5
TV P1 to 5
WEATHER
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 CD or the radio using the
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:
"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.
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.
PUSH CLOSE
Features
· TV/WEATHER/FM/AM 4 band PLL (phase locked
loop) synthesized clock radio
· Easy preset digital tuning with 25 memory presets
· 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)


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5
ICF-CD855V
· This set can be disassembled in the order shown below.
SECTION 3
DISASSEMBLY
3-1.
DISASSEMBLY FLOW
Note: Follow the disassembly procedure in the numerical order given.
3-2.
CABINET (REAR) BLOCK
CD lid
3
two screws
(B2.6)
q;
cabinet (rear)
block
button (open)
1
Push the button (open),
and open the CD lid.
8
two flexible flat cables
(CNP301, 302)
7
5
two screws
(B2.6)
4
screw (B2.6)
6
six claws
6
two claws
9
connector
(CNP901)
2
two screws
(B2.6)
3-2. CABINET (REAR) BLOCK
(Page 5)
3-3. CABINET (UPPER) BLOCK
(Page 6)
3-9. CD LID BLOCK
(Page 9)
3-5. OPTICAL PICK-UP BLOCK
(KSM-900AAA)
(Page 7)
3-6. OPTICAL PICK-UP (KSS-900A)
(Page 7)
3-7. MAIN BOARD
(Page 8)
3-8. SPEAKER (SP101/SP201)
(Page 9)
SET
3-4. CD BOARD
(Page 6)