Sony ICFCD-855-V Service manual

ICF-CD855V

SERVICE MANUAL

Ver 1.0 2004.02

SPECIFICATIONS

US Model

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 8–ohm 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 Wow and flutter: Below measurable limit

–1.5

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 Ω Outputs: i (headphones) jack (ø 3.5 mm

Power outputs:

Power requirements: 120 V AC, 60 Hz Dimensions:

Mass: Approx. 1 700 g (3 lb 12 oz)

Design and specifications are subject to change without notice.

stereo minijack)

1 W + 1 W (at 10% harmonic distortion)

Approx. 169 × 165 × 217 mm (w/h/d) (Approx. 6 projecting parts and controls

/4 × 6 1/2× 8 5/8 inches) incl.

TV/WEATHER/FM/AM CD CLOCK RADIO

9-877-569-01 Sony Corporation

2004B05-1 Personal Audio Company C 2004.02 Published by Sony Engineering Corporation

ICF-CD855V

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-63Tr d are e xamples 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)

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.

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.

To Exposed Metal Parts on Set

1.5 k

0.15 µF

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.

Ω

Earth Ground

AC voltmeter (0.75 V)

ICF-CD855V

– MAIN Board (Conductor Side) –

W604

SECTION 1

SER VICING NOTES

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

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.

• In performing the repair with the power supplied to the set, removing 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.

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

ICF-CD855V

RADIO

FM MONO

SLEEP

ALARM A ALARM B

AM PM

WEATHER

FM1FM2

TVAM

VOL

The PRESET TUNING 3 button has a tactile dot.

RADIO

BUZZER

ALARM A

PRESET TUNING

BRIGHTNESS

(headphones) jack

PUSH CLOSE

MID

LOW

SNOOZE•SLEEP OFF

SELECT PRESET

PUSH OPEN

The VOL + button has a tactile dot.

VOL

The CD u button has a tactile dot.

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)

Setting the Brightness of the Backlight

Slide BRIGHTNESS to select HI (high), MID (middle) or LOW for the display according to your preference.

NAP

MHz kHz

AC power cord

MODE

Setting the Clock

Plug in the clock radio.

The display will flash “AM 12:00”.

Press CLOCK for a few seconds.

You will hear a beep and the hour will start to flash in the display.

Press TUNE•TIME SET + or – until the correct hour appears in the display.

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.

WAKE UP

TRACK

AM PM

CLOCK

FM wire antenna

SECTION 2

GENERAL

SHUFFLE

REP 1 ALL

RADIO

BUZZER

ALARM B

NAP

SLEEP

RADIO ON

BAND

OFF

ALARM RESET

TUNE

TIME SET

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

Press ALARM A or B for a few seconds.

After one beep, “ALARM” and the hour will flash on the display.

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

To set the hour rapidly, hold down TUNE•TIME

SET + or –.

Press ALARM A or B.

After one beep, the minutes will flash.

Repeat step 2 to set the minutes and press ALARM A or B.

After one beep, the alarm mode is entered.

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 wakeup 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.)

Perform steps 1 to 5 in “To set the Alarm Time.”

Press ALARM A or B to select “CD” alarm mode.

After one beep, “WAKE UP TRACK” appears on the display.

Press TUNE•TIME SET + or – to select the desired wake-up track number.

Press ALARM A or B.

After one beep, “WAKE UP VOLUME” will flash.

Press TUNE•TIME SET + or – to adjust the volume.

You can also adjust the volume using VOL + or –.

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.

Perform steps 1 to 5 in “To set the Alarm Time.”

Press ALARM A or B to select “RADIO” alarm mode.

“WAKE UP STATION” appears and the preset number flashes on the display.

Press TUNE•TIME SET + or – to select the desired wake-up station.

Preset number changes in the order as follows:

AM P1 to 5 FM1 P1 to 5

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.

Press ALARM A or B.

After one beep, “WAKE UP VOLUME” will flash.

Press TUNE•TIME SET + or – to adjust the volume.

You can also adjust the volume using VOL + or –.

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.

FM2 P1 to 5TV P1 to 5WEATHER

This section is extracted from instruction manual.

C Setting the Buzzer Alarm 1

Perform steps 1 to 5 in “To set the Alarm Time.”

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:

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.

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

3-1. DISASSEMBLY FLOW

SET

3-2. CABINET (REAR) BLOCK

(Page 5)

ICF-CD855V

SECTION 3

DISASSEMBLY

3-3. CABINET (UPPER) BLOCK

(Page 6)

3-4. CD BOARD

(Page 6)

3-5. OPTICAL PICK-UP BLOCK

(KSM-900AAA) (Page 7)

3-6. OPTICAL PICK-UP (KSS-900A)

(Page 7)

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

3-9. CD LID BLOCK

(Page 9)

3-7. MAIN BOARD

(Page 8)

3-8. SPEAKER (SP101/SP201)

(Page 9)

3-2. CABINET (REAR) BLOCK

cabinet (rear) block

Push the button (open), and open the CD lid.

two screws (B2.6)

button (open)

six claws

CD lid

two screws (B2.6)

screw (B2.6)

two screws (B2.6)

two flexible flat cables (CNP301, 302)

connector (CNP901)

two claws

ICF-CD855V

3-3. CABINET (UPPER) BLOCK

cabinet (upper) block

four screws (B2.6)

connector (CNP601)

sheet

flexible flat cabl (CNP303)

sheet

connector (CNP602)

3-4. CD BOARD

three claws

flexible flat cable (CNP701)

three screws (B2.6)

three claws

CD board

3-5. OPTICAL PICK-UP BLOCK

(KSM-900AAA)

connector (CNP706)

optical pick-up block (KSM-900AAA)

insulator

screw (B2.6)

ICF-CD855V

two screw (B2.6)

RELAY board

3-6. OPTICAL PICK-UP

(KSS-900A)

flexible board (CNP705)

rack spring (780C)

two insulators

screw (B1.7

chassis (CD)

holder (780C)

gear (B) (780C)

screw (2

sled screw assy (780E)

optical pick-u (KSS-900A)

ICF-CD855V

FM wire antenna (ANT1)

TUNER board

FRONT VIEW BACK VIEW

3-7. MAIN BOARD

TUNER board

four

screws

(B2.6)

connector (CNP2)

MAIN board

three

(B2.6)

screws

connector (CNP304)

two

(B2.6)

screws

power uni

Remove two solders.

ANTENNA LOCATION

Remove four solders.

SIDE board

3-8. SPEAKER (SP101/SP201)

cover (SP)

six screws (B2.6)

bracket (C) L

screw (B2.6)

speaker (SP201)

screw (B2.6)

bracket (B) L

speaker (SP101)

screw (B2.6)

bracket (A) L

bracket (A) R

screw (B2.6)

ICF-CD855V

screw (B2.6)

bracket (B) R

3-9. CD LID BLOCK

CD lid block

slot

cover (FFC)

three bosses

screw (B2.6)

bracket (C) R

CD lid block

Disengage three bosses of the cover (FFC) from the slots in the CD lid block. Note: Be careful about the cover (FFC),

because it very sharp.

two screws

Draw two flexible flat cables out of the holes in the cabinet (rear) block.

screw

two screws

harness with connector

holes

cabinet (rear) block

ICF-CD855V

SECTION 4

TEST MODE

LCD, LED AND KEY TEST MODE

Procedure:

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

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

3. Press the SNOOZE•SLEEP OFF button. (The LCD display will become as follows)

LCD display

RADIO

FM MONO

SLEEP

ALARM A ALARM B

AM PM

WEATHER

FM1FM2

LWTVAM

MWPM

VOL

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

NAP

MHz

kHz

WAKE UP

TRACK

AM PM

SHUFFLE

REP 1 ALL

Button Segment

CLOCK AM, PM, : (colon), ALARM A ALARM A, AM (ALARM A),

PM (ALARM A), 1 (ALARM A), 2 (ALARM A), 7 segment 1/2/3, ALARM A LED

ALARM B ALARM B, AM (ALARM B),

PM (ALARM B), 1 (ALARM B), 2 (ALARM B), 7 segment 7/8/9, ALARM B LED

VOL +

–

VOL

– VOL – 4e, 4f, 5a, 5d, 5e, 6b, 6e SLEEP SLEEP NAP NAP 1 1b, 1c 2 2a, 2b, 2d, 2e, 2g 3 4a, 4b, 4c, 4d, 4g 4 5b, 5c, 5f, 5g 5 6a, 6c, 6d, 6f, 6g TUNE/TIME SET – . 7 segment 11 TUNE/TIME SET + > 7 segment 10 RADIO ON, BAND RADIO, WEATHER, TV, FM1,

FM2, LW, MW OFF x MHz, kHz CD u CD, B, TRACK , WAKE UP MODE REP, 1, ALL, SHUFFLE,

FM-MONO

5. After all buttons on the set were pressed, press the SNOOZE•SLEEP 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 released from test mode even though the SNOOZE•SLEEP OFF button is pressed.

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

ICF-CD855V

CD TEST MODE

Procedure:

1. Connect 22 kΩ and 100 kΩ resistors in parallel to the end of S618 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 u button.

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

State T ransition 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.

OFF CD –+ RADIO ON SLEEP –+ Processing

0STOP0 FOCUS0 1 FOCUS0 SLDF

2STOP0 FOCUS0 Normal 3STOP FOCUS 4STOPF.LPC EF AUTO

5STOP ALSV FCSF 7STOP LPC OFF FCSF FCSR EF

8STOP TGUP FCSF FCSR 9STOP ALSV FCSF FCSR b cSTOPSTOPSTOPSTOPSTOP SLDF dSTOPSTOPSTOPSTOP SLDR E FOCUS FOCUS FOCUS FOCUS FOCUS FCSF F FOCUS FOCUS

OFF ADJ2:11

SLDF

FCSF

SLDR

FCSR

STOP

FOCUS FOCUS FOCUS FCDR

BAND end

ADJ1:11

SCURVE

ADJ3:11

Normal

AUTO

Long pressed

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

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

ICF-CD855V

CD-JUMP TEST MODE

Procedure:

1. Connect the oscilloscope to TP (TE) and TP (VREF) on the CD board. Connecting Location: CD board (See page 15)

2. Connect 22 kΩ and 100 kΩ resistors in parallel to the end of S618 on the LCD board, and further connect 47 kΩ and 47 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 u button.

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

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

REP ALL mode 500 µs/div

+ > – .

Button

SHUFFLE mode 1 ms/div

SHUFFLE REP mode 10 ms/div

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

SECTION 5

ELECTRICAL ADJUSTMENTS

ICF-CD855V

TUNER SECTION 0 dB=1 µV

[AM]

Setting:

Function: RADIO Band: AM

MAIN board

AM RF signal

generator

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

Put the lead-wire antenna close to the set.

set

CNP304 pin

Ω

MAIN board CNP304 pin

[FM/TV/WEATHER]

Setting:

Function: RADIO Band: FM/TV/WEATHER

MAIN board

FM RF signal

generator

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

TUNER board

0.01 µF

TUNER board TP (GND)

TP (VT)

TP (GND)

TUNER board TP (ANT)

set

100 kΩ

CNP304 pin

MAIN board CNP304 pin

digital voltmete

•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.

level meter

+ –

level meter

Ω

+ –

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter

T1 450 kHz

AM VCO VOLT AGE ADJUSTMENT

Adjustment Part Frequency Display Reading on Digital Voltmeter

L6 530 kHz 1.0 ± 0.1 V

Confirmation 1,710 kHz 5.3 ± 0.7 V

AM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

L5 620 kHz

CT5 1,400 kHz

FM/TV/WEATHER IF ADJUSTMENT

Adjust for a minimum reading on level meter

T2 10.75 MHz

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

Adjustment Part Frequency Display Reading on Digital Voltmeter

L4 TV 2 ch 0.5 ± 0.15 V

CT3 108 MHz 4.5 ± 0.15 V

FM/TV (2 – 6 CH) TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

L2 TV 2 ch

Confirmation 108 MHz

TV (7 – 13 CH)/WEATHER VCO VOLTAGE ADJUSTMENT

Adjustment Part Frequency Display Reading on Digital Voltmeter

L3 WEATHER 2 ch 1.2 ± 0.15 V

CT4 TV 13 ch 4.2 ± 0.15 V

TV (7 – 13 CH)/WEATHER TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

L1 WEATHER 2 ch

CT2 TV 13 ch

Adjustment and Connecting Location:

TUNER and MAIN board (See page 14)

ICF-CD855V

Adjustment and Connecting Location:

– TUNER BOARD (Component Side) –

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

FM/TV (2 – 6 CH) VCO Voltage Adjustment

L3 CT4

L4 CT3

FM/TV/WEATHER

IF Adjustment

AM IF Adjustment

TV (7 – 13 CH)/

CT2

WEATHER

Tracking Adjustment

FM/TV (2 – 6 CH)

Tracking Adjustment

AM VCO Voltage Adjustment

– TUNER BOARD (Conductor Side) –

(GND)

(VT)

AM Tracking Adjustment

CT5

(ANT)

– MAIN BOARD (Conductor Side) –

CNP304

1 4

CD SECTION

Perform all CD section check in the test mode.

FOCUS BIAS CHECK

Procedure:

1. Connect the oscilloscope to TP (RF) and TP (VREF) on the

CD board.

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

3. While playing the CD, set the CD test mode (Refer to CD

TEST MODE (See page 11)) (Automatic adjustment value is held at this time).

4. Press the CD u button. (LPC ON) (700 is displayed on the

LCD)

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 u button. (LPC OFF) (800 is displayed on the

LCD)

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

8. Press the OFF x button.

9. Press the [SLEEP] button in the state where 200 or 100 are

displayed on the LCD, and release the CD test mode.

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

(CD-RW)

11. Perform confirmation in the same manner as step 2 to 7.

ICF-CD855V

• 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)

1.2

0.4 Vp-p (LPC OFF)

CD-RW:

1.1

0.2 Vp-p

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

Connecting Location:

– CD BOARD (Conductor Side) –

IC702

(RF)

(TE)

IC701

(VREF)

1515

+ 35 hidden pages

Sony ICFCD-855-V Service manual

SER VICING NOTES

TABLE OF CONTENTS

GENERAL

3-1. DISASSEMBLY FLOW

DISASSEMBLY

cabinet (rear) block

cabinet (upper) block

CD board

optical pick-up block (KSM-900AAA)

MAIN board

3-8. SPEAKER (SP101/SP201)

CD lid block

TEST MODE

ELECTRICAL ADJUSTMENTS