Sony ICFCD-853 Service manual

ICF-CD853/CD853L

SERVICE MANUAL

Ver 1.1 2002.07

Photo: ICF-CD835L

SPECIFICATIONS

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
Wow and flutter: Below measurable limit

Radio section

Frequency range:

Model for North America

Band ICF-CD853

FM 87.5 - 108 MHz 0.1 MHz

AM 530 - 1 710 kHz 10 kHz

Model for other countries

Band

FM

AM(MW)

LW —

ICF-CD853 ICF-CD853L

87.5 - 108 MHz 87.5 - 108 MHz 0.05 MHz

531 - 1 602 kHz 531 - 1 602 kHz 9 kHz

153 - 279 kHz 9 kHz

+1

dB

–1.5

Channel step

Channel step

Canadian Model

Italian Model

East European Model

ICF-CD853

AEP Model

UK Model

ICF-CD853L

Model Name Using Similar Mechanism CFD-G70/G70L
Optical Block Name KSM-213RDP
Optical Pick-up Name KSS-213R

General

Time display:

UK, North and South America: 12-hour system
Other countries: 24-hour system

Speaker: 66 mm (2
Outputs: i (headphones) jack (ø 3.5 mm

Power outputs:

1.2 W + 1.2 W (at 10% harmonic distortion)

Power requirements:

North American model:
120 V AC, 60 Hz
Other models:
220-230 V AC, 50 Hz

Dimensions:

Approx. 185.5 × 176 × 210.5 mm (w/h/d)
(Approx. 7
projecting parts and controls

Mass:

Approx. 1 780 g (3 lb. 15 oz.)
ICF-CD853L (UK model):
Approx. 1 870 g (4 lb. 2 oz.)

Design and specifications are subject to change
without notice.

5

⁄8 inches) dia., 4 Ω

stereo minijack)

3

⁄8 × 7 × 8 3⁄8 inches) incl.

9-873-680-02 Sony Corporation

2002G0500-1 Personal Audio Company
C 2002.07 Published by Sony Engineering Corporation

ICF-CD853

FM/AM CD CLOCK RADIO

ICF-CD853L

FM/MW/LW CD CLOCK RADIO

ICF-CD853/CD853L

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 Device (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. Note for Printed Wiring Board and

Schematic Diagrams ....................................................... 15

5-5. Printed Wiring Board – CD Section – .......................... 16

5-6. Schematic Diagram – CD Section – ............................. 17

5-7. Printed Wiring Board – MAIN Section – ..................... 18

5-8. Printed Wiring Boards – POWER Section – ................ 19

5-9. Schematic Diagram – MAIN section (1/2) – ............... 20

5-10. Schematic Diagram – MAIN section (2/2) – ............... 21

5-11. Printed Wiring Boards – PANEL Section – ................. 22

5-12. Schematic Diagram – PANEL Section –...................... 23

5-13. IC Pin Function Description .......................................... 26

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.

SAFETY CHECK-OUT

After correcting the original service problem, perform the follow­ing 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 leaka ge 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. Follo w 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” indica­tion is 0.75 V, so analog meters must have an accurate low­voltage scale. The Simpson 250 and Sanwa SH-63Tr d are ex­amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V A C range are suit­able. (See Fig. A)

To Exposed Metal
Parts on Set

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 Block (KSM-213RDP)....................................... 31

7. ELECTRICAL PARTS LIST .............................. 32

This Compact Disc player is classified
as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT label
is located on the bottom exterior.

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 MANU AL OR IN SUPPLEMENTS PUB­LISHED BY SONY.

1.5 k

0.15 µF

Fig. A. Using an AC voltmeter to check AC leakage.

Ω

Earth Ground

AC
voltmeter
(0.75 V)

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra­diation exposure.

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.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE 0
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM­POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

2

SECTION 1



Canadian model: AC: 120 V - 60 Hz 15 W
Except Canadian model: AC: 220 – 230 V - 50 Hz 15 W

MODEL NO. ICF-CD853

SERVICING NOTES

ICF-CD853/CD853L

NOTES ON HANDLING THE OPTICAL PICK-UP
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.

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 objectiv e lens.

LASER DIODE AND FOCUS SEARCH OPERATION
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.

• Method
Emission of the laser diode is visually checked.

1. Open the upper lid.

2. Push the S302 as shown in Fig.1.

Note: Do not push the detection lever strongly, or it may be bent or dam-

aged.

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.

CHUCK PLATE JIG ON REPAIRING

On repairing CD section, playing a disc without the CD lid, use
Chuck Plate Jig.

• Code number of Chuck Plate Jig: X-4918-255-1

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.

Mark Center frequency

CF3

mark

CF1

red 10.70 MHz

blue 10.67 MHz

orange 10.73 MHz

black 10.64 MHz

white 10.76 MHz

MODEL IDENTIFICATION – Bottom View –

S302

Fig.1 Method to push the S302

3

ICF-CD853/CD853L

y

SECTION 2

GENERAL

This section is extracted from
instruction manual.

The PRESET TUNING 3 button has a tactile dot.
i (headphones)
jack
Prise i
(casque)

NAP indicator
Indicateur
NAP

Display window*
(12-hour system)

*

Afficheur
(système par 12
heures)

* The display differs depending on

your country.

*L’affichage diffère selon votre pays.

Features

•FM/AM 2 band (ICF-CD853) or FM/MW/LW
3 band (ICF-CD853L) PLL (phase locked loop)
synthesized clock radio

• Easy preset digital tuning with 15 memory
presets for ICF-CD853, 20 memory presets for
ICF-CD853L

• 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
extendable snooze function.

• Easy nap timer –one push operation.

• LCD with backlight which has a brightness
control switch.

•D.S.T. (Daylight Saving Time) –Summer time
calculation.

La touche de PRESET TUNING 3 comporte un point tactile.

The CD u button has a tactile dot.
La touche CD u comporte un point tactile.

Setting the Brightness
of the Backlight

Press BRIGHTNESS to select high, middle or low
for the display according to your preferences.

Setting the Clock
and Date

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 year will start to
flash in the display.

3

Press TUNE/TIME SET + or – until the
correct year appears in the display.

4

Press CLOCK once.

5

Repeat steps 3 and 4 to set the month,
day, hour, and minute.

After setting the minute, press CLOCK to
start the counting of the seconds, and you
will hear two short beeps.

To display the year and date, press
SNOOZE•DATE/SLEEP OFF once for the date,
and within 4 seconds press it again for the year.
The display shows the date or year for a few
seconds and then changes back to the current
time.

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 s

stem: “0:00” = midnight

FM wire antenna
Antenne fil FM

AC power cord
Cordon
d’alimentation
secteur

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.

In step 5, when you press CLOCK after the
minute setting to activate the clock, the seconds
start counting from zero.

To change the display to the
daylight saving time (summer time) indication

Press D.S.T./SUMMER T..
“

” is displayed and the time indication

changes to summer time.
To d eactivate the summer time function, press
D.S.T./SUMMER T. again.

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”).

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
“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.

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.

3

Press TUNE/TIME SET + or – until the
desired hour appears.

To set the hour rapidly, hold down TUNE/
TIME SET + or –.

4

Press ALARM SET CD.

The minute will flash.

5

Repeat step 3 to set the minute and
press 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 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.

1

Tune in to a station and adjust the
volume.

2

Press ALARM SET RADIO for a few
seconds.

“ALARM” and “RADIO” appear on the
display.
After one beep, “ALARM” and the hour will
start to flash on the display.

3

Press TUNE/TIME SET + or – until the
desired hour appears.

To set the hour rapidly, hold down TUNE/
TIME SET + or –.

4

Press ALARM SET RADIO.

The minute will flash.

5

Repeat step 3 to set the minute and
press 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.

Preset number changes in the order as
follows:

ICF-CD853

ICF-CD853L

P

“P–” is the last received station.
You can directly select the desired wake-up
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.

AM P1 to 5

P

-

MW P1 to 5 FM1 P1 to 5

-

FM1 P1 to 5FM2 P1 to 5

FM2 P1 to 5LW P1 to 5

To Set the Buzzer Alarm:

Press ALARM SET BUZZER for a few

1

seconds.

“ALARM” and “BUZZER” appear on the
display.
After one beep, “ALARM” and the hour will
start to flash in 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 SET BUZZER.

The minute will flash.

4

Repeat step 2 to set the minute and
press 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, CD/RADIO/BUZZER indicator
changes in the order as follows:

The alarm time which plays or sounds next is
displayed.

CD

RADIO

BUZZER

CD+RADIO

OFF

CD+BUZZER

RADIO+BUZZER

CD+RADIO+BUZZER

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 wake­up 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 or 0:00 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.

For the buzzer 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, buzzer alarm through the speakers
and the headphones regardless of the alarm
mode setting. In this case, the unit will not play a
CD or radio.

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.

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 snooze time changes as follows:

The display shows the snooze time for a few
seconds and returns to show the current time.
When you press SNOOZE•DATE/SLEEP OFF
after the current time appeared, the snooze time
starts from 10 minutes again.

The maximum length of the snooze time is 60
minutes.

20

10

30

40

60

50

ALARM OFF—

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.

To Deactive the Alarm

Press ALARM MODE repeatedly until CD/
RADIO/BUZZER indicator go off.

Setting the Sleep
Timer

You can enjoy falling asleep to the radio using
the built-in sleep timer that turns 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:

off (current time)

“SLEEP” will appear in the display when the
duration time is set.
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.

90

60

15

30

4

• This set can be disassembled in the order shown below.

3-1. DISASSEMBLY FLOW

SET

3-2. Rear Cabinet Assy

(Page 6)

ICF-CD853/CD853L

SECTION 3

DISASSEMBLY

3-4. Upper Cabinet Assy

(Page 7)

3-5. MAIN Board

(Page 7)

3-6. CD Block

(Page 8)

3-7. Optical Pick-up Device

(KSS-213R)
(Page 8)

3-3. CD Lid

(Page 6)

5

ICF-CD853/CD853L

)

Note: Follow the disassembly procedure in the numerical order given.

3-2. REAR CABINET ASSY

4

connector (CN901)

4

connector (CN305)

3

2

two screws (P3 × 14)

5

rear cabinet assy

2

two screws (P3 × 14

2

two screws (P3 × 10)

3-3. CD LID

1

two screws (P3 × 10)

4

CD lid

3

boss

3

boss

2

damper

1

6

screw (P3 × 10)

3-4. UPPER CABINET ASSY

s

1

screw (3 × 10)

4

flexible flat cable (20core)
(CN301)

2

two screws (P3 × 10)

3

1

screw (3 × 10)

ICF-CD853/CD853L

5

upper cabinet assy

3-5. MAIN BOARD

1

flexible flat cable (14core)
(CN302)

3

MAIN board

2

screw (P3 × 10)

2

four screw
(P3 × 10)

7

ICF-CD853/CD853L

)

3-6. CD BLOCK

3

vibration proof (green)

2

3

vibration proof (green)

1

screw (2.6 × 10)

4

CD block

1

three screws
(2.6 × 10)

3-7. OPTICAL PICK-UP DEVICE

(KSS-213R)

3

gear (B)

two claws

1

3

vibration proof (red)

8

optical pick-up device (KSS-213R)

3

vibration proof (red

2

CD cover

1

two claws

5

6

sled shaft

4

two screws (M2)

7

flexible flat cable (16core) (CNP701)

8

SECTION 4

ELECTRICAL ADJUSTMENTS

ICF-CD853/CD853L

TUNER SECTION 0 dB=1 µV

[AM (MW/LW)]

Setting:

Function : RADIO
RADIO BAND button : AM or MW or LW

AM RF signal

generator

30% amplitude
modulation by
400 Hz signal
Output level:
as low as possible

[FM]

Setting:

Function : RADIO
RADIO BAND button: FM

FM RF signal

generator

22.5 kHz frequency
deviation by 400 Hz
signal
Output level:
as low as possible

Put the lead-wire
antenna close to
the set.

set

MAIN board
TP (FM IN)

0.01 µF
set

MAIN board
TP (GND)

MAIN board
CN303 pin

level meter

4.0

Ω

MAIN board
CN303 pin

MAIN board
CN303 pin

4.0

Ω

MAIN board
CN303 pin

4

+
–

3

4

level meter

+
–

3

MW VCO VOLTAGE ADJUSTMENT (CD853L)

Adjustment Part Frequency Display Reading on Digital Voltmeter

L4 531 kHz 2.7 ± 0.05 V

Confirmation 1602 kHz 9.5 ± 1.5 V

LW VCO VOLTAGE ADJUSTMENT (CD853L)

Adjustment Part Frequency Display Reading on Digital Voltmeter

CT4 279 kHz 9.0 ± 0.05 V

Confirmation 153 kHz 2.35 ± 1.0 V

MW TRACKING ADJUSTMENT (CD853L)

Adjust for a maximum reading on level meter
L3-1 621 kHz
CT2 1404 kHz

LW TRACKING ADJUSTMENT (CD853L)

Adjust for a maximum reading on level meter
L3-2 162 kHz
CT3 243 kHz

FM VCO VOLTAGE CONFIRMATION

Adjustment Part Frequency Display Reading on Digital Voltmeter

Confirmation 87.5 MHz 3.2 ± 0.5 V
Confirmation 108 MHz 10.3 ± 1.5 V

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

L1 87.5 MHz

CT1 108 MHz

Adjustment Location: MAIN board (See page 10)

digital voltmeter

MAIN board

Ω

TP (VT)

TP (GND)

100 k

•Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca­pacitors.

• Remove FM antenna in FM adjustment.

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter

T1 450 kHz

( ): Italian model

AM VCO VOLTAGE ADJUSTMENT (CD853)

Adjustment Part Frequency Display Reading on Digital Voltmeter

L4 530 kHz (531 kHz) 3.0 ± 0.05 V

Confirmation

AM TRACKING ADJUSTMENT (CD853)

Adjust for a maximum reading on level meter

L3 580 kHz (621 kHz)

CT2 1,490 kHz (1404 kHz)

1,710 kHz

(1602 kHz)

9.7 ± 1.5 V (9.0 ± 1.5 V)

( ): Italian model

FM STEREO ADJUSTMENT

Setting:

Function: RADIO
RADIO BAND button: FM

FM RF SSG

Carrier frequency : 87.5 MHz
Modulation : no modulation

Output level : 0.1 V (100 dB)

( ): Except CD853: Canadian model

µ

F

0.01

(98 MHz)

MAIN board
TP (FM IN)

set

MAIN board
TP (GND)

1. Connect the frequency counter to TP (FMST) and TP (RA­DIO +B) as shown the figure below.

2. Tune the set to 87.5 MHz (98 MHz).

3. Adjust RV1 for 75.95 to 76.05 kHz reading on the frequency
counter.

frequency counter

MAIN board

TP (FMST)

TP (RADIO +B)

TP (GND)

1

33 k

µ

F/50 V

+

+
–

Ω

Adjustment Location: MAIN board (See page 10)

9

ICF-CD853/CD853L

Adjustment Location:

– MAIN BOARD (Component Side) –

LW Tracking Adjustment (CD853L)

T1 AM (MW/LW) IF Adjustment

FM Tracking Adjustment

RV1 FM Stereo Adjustment

L4 AM (MW) VCO Voltage Adjustment

CT4 LW VCO Voltage Adjustment

AM (MW) Tracking Adjustment

CT3
L3-2

CT1
L1

CT2
L3-1

– MAIN BOARD (Conductor Side) –

CN303

1
4

TP

(RADIO B+)

TP

(VT)

TP (FM IN)

TP

(GND)

TP

(FM ST)

10

CD SECTION

CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.

FOCUS BIAS CHECK

1. Connect the oscilloscope to TP (RF) and TP (GND) on the CD
board.

2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)

3. Press the u (CD) button.

4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape (◊) in the
center of the waveform can be clearly distinguished.

• RF signal reference waveform (eye pattern)

VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns

0.8

±

0.2 Vp-p

ICF-CD853/CD853L

When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.

Adjustment Location:

– CD BOARD (Conductor Side) –

IC701

TP (GND)

TP

(RF)

1111

ICF-CD853/CD853L

5-1. BLOCK DIAGRAM – CD Section –

SECTION 5

DIAGRAMS

DETECTOR

A

D

C

B

F

E

OPTICAL PICK-UP

(KSS-213R)

LASER DIODE

PD

LD

I-V AMP

RF AMP, FOCUS/TRACKING SERVO,

DIGITAL SIGNAL PROCESSOR,

CLV SERVO, D/A CONVERTER

A

D

C

B

F

E

LD

AUTOMATIC

POWER

CONTROL

Q701

FIN2

8

FIN1

7

TIN2

10

TIN1

9

LDD

80

TBAL

APC

LPF

+

MIX

LPF

AUDIO

ADJUST

LDS

79

TE

13FE15

IC701

EFM

RF

EQ

AGC

SW

TRACK

JUMP

S/H

TDO21FDO23SLDO22SPDO

20

4

PH

BH

CONT4

25

IN

3

A/D

D/A

GENERAL-PURPOSE

PORTS

SLISE LEVEL

CONTROL

SW

CONT1

72

RUPTURE

DETECT

SERVO

PROCESSOR

RAM

ERROR

CORRECTION

AUDIO CD

C1 – 2, C2 – 2

XIN

49 48

RAM

XOUT

INTERPOLATION

MUTE

ATTENUATION

DEEMPHASIS

CLV, CAV
CONTROL

RES

66

8FS

DIGITAL

FILTER

PLL

VCEC

COMMAND
INTERFACE

61CE62CL63DI64DO65

1 BIT

DAC

AUDIO

OUT

PROTECT INSERT,

WRQ

FRAME SYNC

DETECT,

EFM DECODE

DRF

LPF

LCHO
RCHO

DOUT

FSEQ

DRF

42

R-CH

45

39

31

67

• R-ch is omitted due to same as L-ch.

• SIGNAL PATH

: CD PLAY

41 FSEQ

57 DRF

SYSTEM

CONTROLLER

IC401 (1/2)

CD-L

A

(Page 14)

2-AXIS
DEVICE

(FOCUS)

PD

T+

T–

(TRACKING)

F+

1

F–

M702

(SLED)

M701

(SPINDLE)

S701

(LIMIT)

FOCUS/TRACKING COIL DRIVE,

SPINDLE/SLED MOTOR DRIVE

IC702

T+

12

11

17

18

M

M

26

27

2

1

T–

F+

F–

SL+

SL–

SP+

SP–

TRACKING

COIL DRIVE

FOCUS

COIL DRIVE

SLED

MOTOR DRIVE

SPINDLE

MOTOR DRIVE

SLIN

SPIN

TIN

FIN

9

19

25

3

7MUTE

X701

33.8688MHz

D306

D307

D308

D52

DI

D53

CLK

CE

D54

50 WRQ

56 DATA-IN CD

54 DATA CD/RADIO

55 CLK CD/RADIO

53 LAT CD/RADIO

58 XRST

S301

CD LID OPEN/CLOSE

DETECT

OPEN

39

DI, CLK, CE

B

(Page 13)

1212

5-2. BLOCK DIAGRAM – TUNER Section –

CF1

10.7MHz

ICF-CD853/CD853L

(CD853)

AM FERRITE-ROD

ANTENNA

AM TRACKING

(CD853L)

L3-1

(MW)

L3-2
(LW)

L3

MW/LW

FERRITE-ROD

ANTENNA

CT3, L3-2

TRACKING

L3

CT2, L3

CT3

LW

CT2

D5

(2/3)

Q2

MW/LW
SWITCH

Q2

D4

(1/2)

CT2

(1/3)

CT2, L3-1

MW

TRACKING

D5

ANT1

(FM)

L1

FM RF

CT1, L1

FM TRACKING

CT1

BPF1

BPF

D2

L4

AM(MW/LW) VCO

VOLTAGE

L4
AM

OSC

CT4

LW VCO

VOLTAGE

SWITCH

FM IF AMP/

AM IF AMP/

PD1

PD2

PILOT DET

LPF

3

26

DISCRI

DISCRI

DET

PILOT DET

LPF

2

1/2

CONTER

PLL LPF

1

TUNING

INDICATOR

L.P.F.

VCO

PLL LPF27VCO

29

RV1

FM STEREO

DECODER

AMP

SWITCH

LCH OUT

RCH OUT

ST IND

6

5

R-CH

4

TU-L

C

(Page 14)

FM/AM FRONT-END,

FM/AM DET, MPX

IC1

FM
ANT

18

FM RF

20

AM RF
IN

19

CT4

Q3
LW

D5

(3/3)

(CD853)

D4

(2/2)

FM

FRONT-END

AM

FRONT-END

AM OSC

24 22

FM OSC

FM/AM
FE OUT

16 13

AM IFT

T1

AM IF

REG

21

T1

REGULATOR

CF3

10.7MHz

CF2

450kHz

STEREO/MONO

SELECT

FM/AM

SELECT

15

FM
IF IN

AM
IF IN

14

BAND SW

• R-ch is omitted due to same as L-ch.

• SIGNAL PATH

: FM

: AM

X51

75kHz

20

19

FM/AM PLL

IC51

XOUT

XIN

REFERENCE

DIVIDER

6

BO2

A OUT

LOW-PASS

FILTER

LOW-PASS

FILTER

UNLOCK

DETECT

PD

A IN

PHASE

DETECTOR/

CHARGE PUMP

12 BIT

PROGRAMMABLE

DIVIDER

SWALLOW

COUNTER

111218

FM IN

AM IN

1/2

SHIFT REGISTER & LATCH

UNIVERSAL

COUNTER

517 16

BO1

CCB

INTERFACE

DI, CLK, CE

DI

2

CL

3

CE

1

DI

CLK

CE

B

(Page 12)

1313