Sony ICFCD-73 Service manual

ICF-CD73/CD73V

SERVICE MANUAL

Ver. 1.1 2005.02

Photo: ICF-CD73V

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 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
Wow and flutter: Below measurable limit

Radio section

Frequency range: (ICF-CD73)

North America

Band Channel

FM 87.5 — 108 MHz 0.1 MHz
AM 530 — 1 710 kHz 10 kHz
FM 87.5 — 108 MHz 0.05 MHz
AM 531 — 1 710 kHz 9 kHz

Other countries/regions

Band Channel

FM 87.5 — 108 MHz 0.05 MHz
AM 531 — 1 611 kHz 9 kHz
FM 87.5 — 108 MHz 0.1 MHz
AM 530 — 1 610 kHz 10 kHz

Frequency range: (ICF-CD73V)
Band Range Channel

TV 2 — 13 ch 1 channel
WEATHER 1 — 7 ch 1 channel

FM 87.5 — 108 MHz 0.1 MHz
AM 530 — 1 710 kHz 10 kHz

+1

—1.5

step

step

step

dB

US Model

ICF-CD73V

Canadian Model

AEP Model

UK Model

E Model

ICF-CD73

Model Name Using Similar Mechanism ZS-X3CP
CD Mechanism Type KSM-900AAA
Optical Pick-up Name KSS-900A

General

Time display:

North America, UK: 12-hour system
Other countries/regions: 24-hour system

Speaker: 50 mm (2 inches) dia, 6 Ω
Power outputs:

400 mW + 400 mW (at 10% harmonic
distortion)

Power requirements:

6 V DC, 4 R14 (size C) batteries

External power source: DC IN 6 V
Dimensions:

Approx. 151.5 × 248 × 84 mm (w/h/d)
(Approx. 6 × 9
projecting parts and controls

Mass: Approx. 1 350 g (2 lb 16 oz) incl. batteries
Supplied accessories:

Suction cup (1), Strap (1)
AC power adaptor (1)*
* Supplied with European model only

Design and specifications are subject to change
without notice.

7

/8 × 3 3/8 inches) incl.

ICF-CD73

FM/AM CD PORTABLE RADIO

ICF-CD73V

TV/WEATHER/FM/AM

CD PORTABLE RADIO

9-877-131-02 Sony Corporation

2005B05-1 Personal Audio Group

© 2005.02 Published by Sony Engineering Corporation

ICF-CD73/CD73V

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.

Flexible Circuit Board Repairing

•Keep the temperature of the soldering iron around 270 ˚C dur­ing 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 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 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. 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-63T rd 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

AC

0.15 µF

1.5 k

Ω

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.

UNLEADED SOLDER

Boards requiring use of unleaded solder are printed with the lead­free 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 oc­cur 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.

Using the AC power adaptor

•When operating the unit with an external power source, do not remove the
batteries.
These batteries serve to backup the clock and memory settings. Since the
batteries discharge in this case as well, we recommend changing them about
once a year.

•To pre vent battery leakag e, we recommend removing the batteries when the
unit is connected to a wall outlet.

• Before connecting and disconnecting the external power source plug, be
sure to turn off the radio/CD. Otherwise, “E ” may be displayed. When this
occurs,turn on the radio/CD so that “E ” disappears..

•When the A C power adaptor is not to be used for a long period of time,unplug
it both from the DC IN 6 V jack and from the wall outlet.

•When the cover of the DC IN 6 V jack is open (to use the AC power adap­tor), the jack area is not splash-resistant. When the AC power adaptor is not
connected to the DC IN 6 V jack, be sure to close the cover of the DC IN 6
V jack.

• Use the recommended Sony AC poweradaptor * only. The polarity of the
plugs of other manufacturers may be different. Failure to use the recom­mended AC power adaptor may cause the unit to malfunction.

* Supplied with European model only

If you have any questions or problems concerning your unit,please consult
your nearest Sony dealer.

Earth Ground

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

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.

2

Polarity of the plug

About CD-Rs/CD-RWs

This unit is compatible with CD-Rs/CD-RWs but playback capability may v ary
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.

TABLE OF CONTENTS

1. SERVICING NOTES .............................................. 4

2. GENERAL .................................................................. 5

3. DISASSEMBLY

3-1. Disassembly Flow ........................................................... 6

3-2. Cabinet (Front) Section ................................................... 6

3-3. Cabinet (Upper) Section ................................................. 7

3-4. Chassis (Main) Section ................................................... 7

3-5. LCD Board ...................................................................... 8

3-6. Mechanism Deck (KSM-900AAA) ................................ 8

3-7. Optical Pick-up (KSS-900A) .......................................... 9

3-8. Speaker (SP101)/(SP201) ............................................... 9

4. TEST MODE .............................................................. 10

5. ELECTRICAL ADJUSTMENTS........................ 13

6. DIAGRAMS

6-1. Block Diagram – CD Section – .................................... 17

6-2. Block Diagram – TUNER Section (ICF-CD73) – ....... 18

6-3. Block Diagram – TUNER Section (ICF-CD73V) – .... 19

6-4. Block Diagram – MAIN Section – ............................... 20

6-5. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 21

6-6. Printed Wiring Board – CD Section – ......................... 22

6-7. Schematic Diagram – CD Section – ............................. 23

6-8. Printed Wiring Board

– TUNER Section (ICF-CD73) – .................................. 24

6-9. Schematic Diagram

– TUNER Section (ICF-CD73) – .................................. 25

6-10. Printed Wiring Board

– TUNER Section (ICF-CD73V) – ............................... 26

6-11. Schematic Diagram

– TUNER Section (ICF-CD73V) – ............................... 27

6-12. Printed Wiring Boards – MAIN Section – ................... 28

6-13. Schematic Diagram – MAIN Section –........................ 29

6-14. Printed Wiring Boards – POWER Section – ................ 30

6-15. Schematic Diagram – POWER Section – .................... 31

6-16. IC Pin Function Description .......................................... 34

ICF-CD73/CD73V

7. EXPLODED VIEWS

7-1. Overall Section ................................................................ 36

7-2. Cabinet (Front) Section ................................................... 37

7-3. Cabinet (Main) Section ................................................... 38

7-4. Cabinet (Upper) Section ................................................. 39

7-5. Cabinet (Rear) Section-1 ................................................ 40

7-6. Cabinet (Rear) Section-2 ................................................ 41

7-7. Cabinet (Rear) Section-3 ................................................ 42

7-8. Optical Pick-up Section (KSM-900AAA) ..................... 43

8. ELECTRICAL PARTS LIST .............................. 44

3

ICF-CD73/CD73V

Ver. 1.1

SECTION 1

SERVICING NOTES

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 S701. (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 lid.

2. Push the S551 as shown in Fig.1.

3. Press the [CD ] 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.

NX

DISCRIMINATION OF ORIGINAL AND LIV MODEL

There are two types of ICF-CD73V.
Refer to following.

WINDOW Front View

ORIGINAL MODEL

LIV MODEL

S551

Fig.1 Method to push the S551

4

SECTION 2

GENERAL

ICF-CD73 ICF-CD73V

ICF-CD73/CD73V

This section is extracted from
instruction manual.

CLOCK

MODE

AUTO

OFF

M

IN

VOLUME

X

A

M

1

PRESET TUNING/PRESET TIMER

SELECT/ PRESET

TIMER

SET

ON/OFF

5432

RADIO

ON

BAND

TUNE/TIME SET

TIMER SET

OFF

CD

AUTO

OFF

MIN

VOLUME

MAX

1

PRESET TUNING/PRESET TIMER

SELECT/ PRESET

FM wire antenna

AM

AUTO OFF

TIMER

RADIO CD

FM12PM

MHz
kHz

SHUFFLE

ALL

REP1

PRESET
TRACK

RADIO CD

WEATHER
TV

AM

FM12PM

CLOCK

MODE

TIMER

SET

ON/OFF

5432

RADIO

FM wire antenna

AUTO OFF

TIMER

MHz
kHz

ON

BAND

SHUFFLE
REP1

TUNE/TIME SET

TIMER SET

OFF

CD

ALL

PRESET
TRACK

Setting the Clock

The display will flash “AM12:00” when the
batteries are installed or the AC power adaptor is
plugged in for the first time.

1 Press and hold down CLOCK for more

than 2 seconds.

The beep sounds and the hour flashes in the
display.

2 Rotate in either +/– direction the TUNE/

TIME SET/TIMER SET dial until

correct hour appears in the display.

AM

AUTO OFF

TIMER

RADIO CD

WEATHER
TV
FM12PM

Each rotation of the dial changes the digit(s)
by one.
When you hold the dial, the digit(s) change
rapidly.

kHz

MHz

SHUFFLE
REP1

ALL

PRESET
TRACK

3 Press CLOCK .

The beep sounds and the minute starts to
flash. Repeat step 2 to set the minute. After
setting the minute, press CLOCK again. The
two beeps sound and the clock starts from
0 seconds.

AM

AUTO OFF

TIMER

RADIO CD

WEATHER
TV
FM12PM

12-hour system: “AM 12:00” = midnight
24-hour system: “0:00” = midnight

Notes

•You can set the clock also during the radio
reception/CD playback mode.

•To set the current time quickly, rotate and hold
in either +/– direction the TUNE/TIME SET/
TIMER SET dial.

•To set the current time exactly, follow step 2
and press CLOCK again with the time signal of
a radio station.

MHz
kHz

SHUFFLE

ALL

REP1

PRESET
TRACK

the

Setting the Clock

The display will flash “AM12:00” when the
batteries are installed or the AC power adaptor
is plugged in for the first time.

1

Hold down CLOCK for more than
2 seconds.

The beep sounds and the hour flashes in the
display.

2

Rotate in either +/– direction the TUNE/
TIME SET/TIMER SET dial until the

correct hour appears in the display.

SHUFFLE

ALL

REP1

PRESET
TRACK

MHz
kHz

SHUFFLE

ALL

REP1

PRESET
TRACK

MHz
kHz

“PM 12:00” = noon

AM

AUT O O FF

TIMER

RADIO CD

WEATHER
TV
FM12PM

Each rotation of the dial changes the digit(s)
by one.
When you hold the dial, the digit(s) change
rapidly.

3

Press CLOCK .

The beep sounds and the minute starts to
flash. Repeat step 2 to set the minute. After
setting the minute, press CLOCK again. The
two beeps sound and the clock starts from
0 seconds.

AM

AUTO OFF

TIMER

RADIO CD

WEATHER
TV
FM12PM

12-hour system: “AM 12:00” = midnight

Notes

•You can set the clock also during the radio
reception/CD playback mode.

•To set the current time quickly, rotate and hold
in either +/– direction the TUNE/TIME SET/
TIMER SET dial.

•To set the current time exactly, follow step 2
and press CLOCK again with the time signal of
a radio station.

5

ICF-CD73/CD73V

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

3-1. DISASSEMBLY FLOW

SET

3-2. CABINET (FRONT) SECTION

(Page 6)

SECTION 3

DISASSEMBLY

3-3. CABINET (UPPER) SECTION

(Page 7)

3-4. CHASSIS (MAIN) SECTION

(Page 7)

3-5. LCD BOARD

(Page 8)

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

3-6. MECHANISM DECK

(KSM-900AAA)
(Page 8)

3-7. OPTICAL PICK-UP

(KSS-900A)
(Page 9)

3-2. CABINET (FRONT) SECTION

5

two screws
(2.6

×

7

flat cable (CNP704)

10)

3-8. SPEAKER (SP101)/(SP201)

(Page 9)

8

connector
(CNP302)

6

qa

cabinet (front) section

9

screw (2.6 × 8)

0

SW board block

two screws

4

(2.6

3

×

10)

five screws
(2.6

×

10)

1

Open the buckle
(battery case lid).

2

Open the
battery case lid.

6

3-3. CABINET (UPPER) SECTION

)

4

two claws

3

two screws
(2.6

ICF-CD73/CD73V

2

connector

×

8)

(CNP602)

5

cabinet (upper) section

1

connector
(CNP601

3-4. CHASSIS (MAIN) SECTION

2

connector
(CNP303)

8

Remove the solder
of FM lead wire antenna
(ANT1).

5

two screws
(2.6

1

×

8)

9

chassis (main) section

flat cable
(CNP702)

6

two screws
(2.6

×

8)

3

two screws
(2.6

4

CD board

×

8)

7

cabinet (front) section

7

ICF-CD73/CD73V

)

3-5. LCD BOARD

1

two flat cables
(CNP401, 402)

4

LCD board

2

connector
(CNP1: CD73)/
(CNP2: CD73V

3-6. MECHANISM DECK

(KSM-900AAA)

2

connector
(CNP706)

3

3

screw
(2.6 × 8)

4

relay board

two screws
(2.6

×

8)

1

flexible board
(CNP705)

7

rubber
(vibration)

5

three tapping
screws

8

rubber
(vibration)

0

6

chassis CD block

9

rubber (vibration)

mechanism deck
(KSM900AAA)

8

3-7. OPTICAL PICK-UP

p

s

(KSS-900A)

1

screw

×

8)

(2

2

holder (780C)

7

sled screw assy (780E)

5

rack spring (780C)

6

ICF-CD73/CD73V

4

screw
(B1.7

×

4)

8

optical pick-u
(KSS-900A)

3

gear (B) (780C)

3-8. SPEAKER (SP101)/(SP201)

1

connector
(CNP304)

5

two speakers
(SP101, SP201)

2

screw (2.6 × 8)

3

bracket (SP)

4

spacer (slit)

ditch

2

screw (2.6 × 8)

3

bracket (SP)

Note: When installing the speaker lead wire,

lead the speaker lead wire along ditche
and bosses of the cabinet (front).

ditch

cabinet (front)

boss

boss

ditch

9

ICF-CD73/CD73V

SECTION 4

TEST MODE

LCD AND KEY TEST MODE

Procedure:

1. Turn the power on while pressing simultaneously three but­tons of [RADIO ON BAND], [CLOCK], and [1].

2. The microcomputer version will be displayed on the LCD.

3. Press the [AUTO OFF] button. (The LCD display will become
as follows)

LCD display

MHz
kHz

SHUFFLE
REP1

ALL

PRESET
TRACK

RADIO CD

WEATHER
TV

AM

FM12PM

AUTO OFF

TIMER

4. BEEP (A) will be output and the display corresponding to a
button is turned off, if a button on the set is pressed. Also,
BEEP (A) is output when the button is released.

Button Corresponding Table

Button Segment

CLOCK AM, PM, : (colon),
TIMER SET ON/OFF TIMER , AUTO OFF
1 1b, 1c
2 2a, 2b, 2d, 2e, 2g
3 3a, 3b, 3c, 3d, 3g
4 4b, 4c, 4f, 4g
5 5a, 5c, 5d, 5f, 5g
TUNE – . 6a, 6b, 6c, 6d, 6e, 6f, 6g
TUNE + > TRACK , PRESET
RADIO ON BAND RADIO, WEATHER, TV, FM,

1(FM), 2(FM), TV, .(point), MHz,
kHz

OFF x BatteryLow , 1a, 1d, 1e, 1f, 1g, 1h, 1i,

2c, 2f, 2h, 2i, 3e, 3f, 4a, 4d, 4e, 5b,

5e
CD NX CD, Pz1, Pz2, Pz3, Pz4
MODE , SHUFFLE, REP, 1, ALL

5. After all buttons on the set were pressed, press the [AUTO

OFF] button, and BEEP (B) will be output and the test mode

will be terminated.

6. If there is even one button that was not accepted, the set will
not be r eleased from test mode even though the [AUTO OFF]
button is pressed.

7. The set will return to normal state when the LCD AND KEY
TEST MODE is terminated.

10

ICF-CD73/CD73V

CD TEST MODE

Procedure:

1. Connect 47 kΩ and 100 kΩ resistors in parallel to the end of S501 on the LCD board, and short another end of resistors to the GND,
and the CD TEST MODE will be activated.

2. Insert a CD disc.

3. Turn the power on. Press the [CD ] button.

LCD display

4. The following shows the state transition table for each button operation in respective sub modes of CD TEST MODE.

State Transition T able

If each button is pressed in respective sub modes, the mode will transit to the sub modes listed in table.

MODE Explanation LCD Button

MAIN SUB

INT State when TEST MODE is activated.
STOP STOP0 State when a button is pressed once from initial state.

STOP0 Automatically adjusted value is held.

FOCUS FOCUS0 AUTO FOCUS transfer mode

FOCUS FOCUS SERVO ON state.(CLV-S, TRK/SLED, SERVO OFF)

It will be referred to as LPC ON if FOCUS carries out on.

F.LPC OFF LPC OFF in FOCUS state.
ALL ALSV State where all servo systems are turned on.
SERVO ALPC OFF State where all servo systems are turned on.(LPC:OFF)

TGUP State with TRK GAIN UP in all servo systems are turned on.(LPC:ON)

AUTO Mode in which automatic adjustment is made at once.
SLED SLDF SLED is fed outward in STOP state.

SLDR SLED is fed inward in STOP state.
F.SLED FCSF SLED is fed outward in FOCUS state.

FCSR SLED is fed inward in FOCUS state.

Mode transits to sub modes listed in table, if a button is pressed in respective sub modes.

CD

NX

OFF CD –+ RADIO ON AUTO OFF –+ Processing

NX

x

00 STOP0 FOCUS0
01 FOCUS0 STOP STOP EF Normal SLDF SLDR
02 STOP0 FOCUS0 Normal SLDF SLDR
03 STOP FOCUS
04 STOP F.LPC EF AUTO FCSF FCSR

05 STOP ALSV FOCUS FOCUS FOCUS0 FCSF FCSR
07 STOP ALPC OFF FOCUS FOCUS EF AUTO FCSF FCSR
08 STOP TGUP FOCUS FOCUS FCSF FCSR
09 STOP ALSV FOCUS FOCUS FCSF FCSR

b
cSTOPSTOPSTOPSTOP SLDF
dSTOPSTOPSTOPSTOP SLDR
E FOCUS FOCUS FOCUS FOCUS FCSF
F FOCUS FOCUS FOCUS FOCUS FCSR

OFF

>

.

BAND end

>

.

Long pressed

5. Turn the power off to release the CD TEST MODE.

11

ICF-CD73/CD73V

CD-JUMP TEST MODE

Procedure:

1. Connect the oscilloscope to TP (TE) and TP (VC) on the CD board.
Connecting Location: CD board (See page 16)

2. Connect 47 kΩ and 100 kΩ resistors in parallel to the end of S501 on the LCD board, and further connect 100 kΩ and 220 kΩ resistors
respectively and short them to the GND, and the CD-JUMP TEST MODE will be activated.

3. Insert a CD disc.

4. Turn the power on. Press the [CD ] button.

LCD display

5 . If the [MODE] button is pressed, you can jump in fast feed or fast reverse direction with the + > or – . button by the jump

amount set in Table 1.

Table 1

LCD

+ > – .

REP ALL TRACK + 1 TRACK - 1
SHUFFLE TRACK + 10 TRACK - 10
SHUFFLE, REP TRACK + 100 TRACK - 100

NX

CD

TRACK

Button

Waveform of TP (TE) and TP (VC) output in each mode is as follows.

REP ALL mode
500 µs/div

SHUFFLE mode
1 ms/div

SHUFFLE REP mode
10 ms/div

6. Turn the power off to release the CD-JUMP TEST MODE.

12

r

SECTION 5

ELECTRICAL ADJUSTMENTS

ICF-CD73/CD73V

TUNER SECTION 0 dB=1 µV

[AM]

Setting:

Function: RADIO
Band: AM

AM RF signal

generator

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

[FM/TV/WEATHER]

Setting:

Function: RADIO
Band: FM (ICF-CD73)

FM/TV/WEATHER (ICF-CD73V)

FM RF signal

generator

75 kHz frequency
deviation by 1 kHz
signal
Output level:
as low as possible

Put the lead-wire
antenna close to
the set.

0.01 µF

TUNER board
TP (GND)

TUNER board

TP (VT)

TP (GND)

set

TUNER board
TP (ANT)

set

digital voltmete

100 kΩ

JACK board
CNP304 pin 1

level meter

3.2 Ω
+

–

JACK board
CNP304 pin 2

JACK board
CNP304 pin 1

level meter

3.2 Ω

JACK board
CNP304 pin 2

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter

T1 450 kHz

( ): ICF-CD73V

AM VCO VOLT A GE ADJUSTMENT

Adjustment Part Frequency Display Reading on Digital Voltmeter

L4 (L6) 530 kHz (531 kHz) 1.0 ± 0.05 V (1.0 ± 0.1 V)

Confirmation 1,710 kHz 5.3 ± 0.7 V

( ): ICF-CD73V

AM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

L3 (L5) 620 kHz (580 kHz)

CT3 (CT5) 1,400 kHz (1,490 kHz)

FM IF ADJUSTMENT

Adjust for a minimum reading on level meter

T2 10.7 MHz

FM VCO VOLTAGE ADJUSTMENT (ICF-CD73)

Adjustment Part Frequency Display Reading on Digital Voltmeter

L2 108 MHz 3.0 ± 0.2 V

Confirmation 87.5 MHz 1.3 ± 0.3 V

FM TRACKING ADJUSTMENT (ICF-CD73)

Adjust for a maximum reading on level meter

+
–

L1 87.5 MHz

CT1 108 MHz

FM/TV (2 – 6 CH) VCO VOLTAGE ADJUSTMENT (ICF-CD73V)

Adjustment Part Frequency Display Reading on Digital Voltmeter

L4 TV 2 ch 1.0 ± 0.15 V

CT3 108 MHz 4.0 ± 0.15 V

FM/TV (2 – 6 CH) TRACKING ADJUSTMENT (ICF-CD73V)

Adjust for a maximum reading on level meter

L2 TV 2 ch

Confirmation 108 MHz

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

• Remove FM/TV/WEATHER antenna in FM/TV/WEATHER
adjustment.

TV (7 – 13 CH)/WEATHER (1 – 7 CH) VCO VOLTAGE ADJUSTMENT (ICF-CD73V)

Adjustment Part Frequency Display Reading on Digital Voltmeter

L3 WEATHER 2 ch 1.0 ± 0.15 V

CT4 TV 13 ch 4.1 ± 0.15 V

TV (7 – 13 CH)/WEATHER (1 – 7 CH) TRACKING ADJUSTMENT (ICF-CD73V)

Adjust for a maximum reading on level meter

L1 WEATHER 2 ch

CT2 TV 13 ch

Adjustment and Connecting Location:TUNER board (ICF-

CD73)
(See page 14)
TUNER board (ICF­CD73V)
(See page 15)

13

ICF-CD73/CD73V

Adjustment and Connecting Location:

– TUNER BOARD (Component Side) (ICF-CD73) –

AM VCO Voltage Adjustment

FM VCO Voltage Adjustment

AM T rac king Adjustment

L4

L2

CT3
L3

– TUNER BOARD (Conductor Side) (ICF-CD73) –

TP

(VT)

TP

(GND)

TP

(ANT)

T2 FM IF Adjustment

T1 AM IF Adjustment

L1

FM T rac king Adjustment

CT1

14

Adjustment and Connecting Location:

– TUNER BOARD (Component Side) (ICF-CD73V) –

TV (7 – 13 CH)/
WEATHER (1 – 7 CH)
VCO Voltage Adjustment

TV TV (2 – 6 CH)
VCO Voltage Adjustment

L3
CT4

L4
CT3

T2

IF Adjustment

T1

IF Adjustment

TV (7 – 13 CH)/

CT2

WEATHER (1 – 7 CH)

L1

Tracking Adjustment

L2

FM/TV (2 – 6 CH)

CT1

Tracking Adjustment

ICF-CD73/CD73V

AM VCO Voltage Adjustment

L6

– TUNER BOARD (Conductor Side) (ICF-CD73V) –

TP

)

(GND

TP

(VT)

L5

AM Tracking Adjustment

CT5

TP

(

ANT

)

15

ICF-CD73/CD73V

CD SECTION

Perform all CD section check in the test mode.

FOCUS BIAS CHECK

Procedure:

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

2. Set the CD test mode. (Refer to CD TEST MODE (See page

11))

3. Insert the test disc (YEDS-18). (Part No. 3-702-101-01) (CD)

4. Press the [CD ] button. (LPC ON)

5. 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.

6. Press the [CD ] button. (LPC OFF)

7. Perform confirmation in the same manner as step 5.

8. Press the [OFF ] button.

9. Change the test disc (TCD-W082L). (Part No. J-2502-063-2)
(CD-RW)

10. Perform confirmation in the same manner as step 4 to 7.

NX

NX

x

• RF signal reference waveform (eye pattern)

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

CD:

1.1 ± 0.2 Vp-p (LPC ON)

1.1 ± 0.3 Vp-p (LPC OFF)
CD-RW:

1.0 ± 0.2 Vp-p (LPC ON)

0.9 ± 0.3 Vp-p (LPC OFF)

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

Connecting Location:

– CD BOARD (Conductor Side) –

IC702

TP

(VC)

TP

(TE)

16

TP

(RF)

IC701

SECTION 6

6-1. BLOCK DIAGRAM – CD Section –

FIN2 (PD1)

8

FIN1 (PD2)

7

DETECTOR

A

B

PD1

D

C

PD2

I-V AMP

DIAGRAMS

+

RF AMP, FOCUS/TRACKING SERVO,

DIGITAL SIGNAL PROCESSOR, CLV SERVO,

DIGITAL FILTER, D/A CONVERTER

LPF

MIX

IC701

EQ

AGC

ICF-CD73/CD73V

RAM

RF

4

PH

3

EFMIN

SLISE LEVEL

CONTROL

ERROR

CORRECTION

AUDIO CD

INTERPOLATION

MUTE

ATTENUATION

DEEMPHASIS

8FS

DIGITAL

FILTER

AUDIO

OUT

1 BIT

DAC

LPF

LCHO
RCHO

DOUT

42

R-CH

45

39

CD LCH

A

(Page 20)

F

E

OPTICAL PICK-UP

BLOCK

(KSM-900AAA)

LASER DIODE

LD

PD

2-AXIS
DEVICE

(FOCUS)

LO LD

LO PD

TRK +

TRK –

(TRACKING)

FCS +

FCS –

S/H

A/D

D/A

CONT4

25

PROCESSOR

SW

RUPTURE

DETECT

SERVO

ON :

GENERAL PURPOSE

PORTS

S701

(LIMIT)

When the optical pick-up
is inner position

BH

F

E

AUTOMATIC

POWER

CONTROL

Q701

TIN2 (F)

10

TIN1 (E)

9

LDD

80

19

20

17

18

APC

FOCUS/TRACKING COIL DRIVE,
SPINDLE/SLED MOTOR DRIVE,

POWER CONTROL

IC702

TRK+

TRACKING

TRK–

COIL DRIVE

FCS+

FOCUS

FCS–

COIL DRIVE

TBAL

LDS

79

TRK IN

FCS IN

AUDIO

ADJUST

9

10

LPF

13FE15

SW

TRACK

JUMP

TE

TDO21FDO23SLDO22SPDO

20

RAM

CLV, CAV
CONTROL

CONT166RES

72

PLL

VCEC

COMMAND
INTERFACE

WRQ61CE62CL63DI64DO

65

FRAME SYNC

DETECT,

PROTECT, INSERT,

EFM DECODE

CLOCK

GENERATOR

DRF

FSEQ

XOUT

DRF

XIN

31

48

49

67

X701

16.9344MHz

39 FSEQ

57 DRF

SYSTEM

CONTROLLER

IC401

(1/2)

53 CD DATA IN

54 CD DATA

55 CD CLK

56 CD CE

50 WRQ

58 XRST

59 CD ON

CD OPEN

61

M701

M

(SLED)

M702

(SPINDLE)

CD +3.3V PVCC

+3.3V

REGULATOR

Q705

M

SL+

22

SL–

23

SP+

25

SP–

24

SLED

MOTOR DRIVE

SPINDLE

MOTOR DRIVE

SL IN

SP IN

8

7

4MUTE34

5MUTE1

MUTING
SWITCH

Q702

S551

(CD LID OPEN/CLOSE)

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

• SIGNAL PATH

REGB

31

REGULATOR

DC IN

30

CD ON

SWITCH

Q703, 704

: CD PLAY

1717