Sony ICF-CD873L Manual de usuario

SERVICE MANUAL

FM/MW/LW CD CLOCK RADIO

AEP Model

UK Model

SPECIFICATIONS

ICF-CD873L

Model Name Using Similar Mechanism CFD-550

Optical Device Name KSM-213BAN

Optical Pick-UP Name KSS-213B

Supplied accessories:

Instruction manual (1)

Ver 1.2 2002.11

9-927-129-12 Sony Corporation

2002K0500-1 Personal Audio Company

C2002.11 Published by Sony Engineering Corporation

– 2 –

TABLE OF CONTENTS

1. SERVICING NOTES............................................... 3

2. GENERAL ................................................................... 4

3. DISASSEMBLY ......................................................... 5

4. POWER CORD SETTING................................... 7

5. ELECTRICAL ADJUSTMENTS

Tuner Section .................................................................. 8

CD Section ...................................................................... 9

Main Clock Section......................................................... 11

6. DIAGRAMS

6-1. Block Diagram – CD Section – ..................................... 13

6-2. Block Diagram – TUNER Section – ............................. 15

6-3. Block Diagram – MAIN Section – ................................ 17

6-4. Printed Wiring Boards – MAIN Section – .................... 22

6-5. Schematic Diagram – MAIN Section –......................... 25

6-6. Schematic Diagram – POWER SUPPLY Section –...... 30

6-7. Printed Wiring Boards

– POWER SUPPLY Section – ...................................... 33

6-8. IC Pin Function Description ........................................... 39

7. EXPLODED VIEWS................................................ 41

8. ELECTRICAL PARTS LIST ............................... 45

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK !OR DOTTED

LINE WITH MARK !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.

CAUTION

Use of controls or adjustments or performance of procedures

other than those specified herein may result in hazardous ra-

diation exposure.

This appliance is classified as a CLASS 1 LASER product.

The CLASS 1 LASER PRODUCT MARKING is located on

the rear exterior.

Laser component in this product is capable of emitting radiation

exceeding the limit for Class 1.

The following caution label is located inside the unit.

– 3 –

SECTION 1

SERVICING NOTES

CF2

CF3

mark

Mark Center frequency

red 10.70 MHz

blue 10.67 MHz

orange 10.73 MHz

black 10.64 MHz

white 10.76 MHz

HOW TO CHANGED THE CERAMIC FILTERS

This model is used two ceramic filters of CF2 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.

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.

NOTES ON HANDLING THE OPTICAL PICK-UP

BLOCK OR BASE UNIT

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.

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.

Insert a precision

screwdriver and

push S424.

laser diode

emission

LASER DIODE AND FOCUS SEARCH OPERATION

CHECK

1. Open the CD lid.

2. Turn on S424 as following figure.

3. Confirm that the laser diode emission while observing the ob-

jecting lens. When there is no emission, Auto Power Control

circuit or Optical Pick-up is broken.

Objective lens moves up and down once 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

– 4 –

SECTION 2

GENERAL This section is extracted from

instruction manual.

– 5 –

UPPER CABINET SECTION

CD LID ASSY

SECTION 3

DISASSEMBLY

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

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

Set Upper cabinet

section CD lid assy

Main board section Optical pick-up section

five screws

(P3

14)

upper cabinet section

two flat wires

(CN303, 304)

connector

(CN306)

three screws

(P3

14)

Pull the button (open).

two bosses

Open the CD lid assy.

Remove the CD lid

assy.

screw

(B3

10)

damper

spring

(CD open)

– 6 –

MAIN BOARD SECTION

OPTICAL PICK-UP SECTION

Open the CD lid.

four screws

(P3

14)

three screws

(P3

14)

screw

(B3

10)

Pull the button (open).

twelve

claws

net assy

two claws

flat wire

(CN301)

main board

section

flat wire

(CN402)

CD chassis

two screws

(PWH2.6

10)

screw

(BTP3

flat wire

(CN501)

optical pick-up

section

two screws

(PWH2.6

10)

claw

connector

(CN502)

– 7 –

SECTION 4

POWER CORD SETTING

Set the power cord as illustrated below, then install the lower cabinet section.

Power Cord

lower cabinet section

– 8 –

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter

T1 450 kHz

MW FREQUENCY COVERAGE ADJUSTMENT

Adjustment Part Frequency Display Reading on Digital Voltmeter

L4 531 kHz 2.8 V

Confirmation 1,602 kHz less than 10.5 V

MW TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

L3-1 621 kHz

CT2 1,404 kHz

LW FREQUENCY COVERAGE ADJUSTMENT

Adjustment Part Frequency Display Reading on Digital Voltmeter

CT4 153 kHz 2.2 V

Confirmation 279 kHz less than 9.5 V

LW TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

L3-2 162 kHz

CT3 243 kHz

FM FREQUENCY COVERAGE ADJUSTMENT

Adjustment Part Frequency Display Reading on Digital Voltmeter

L2 87.5 MHz 2.1 V

Confirmation 108 MHz 9.7 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 12)

FM VCO Adjustment

Setting:

Procedure:

1. Connect the frequency counter to TP7, 8 as shown the figure

below.

2. Tune the set to 98 MHz.

3. Adjust RV1 for 76 kHz reading on the frequency counter.

Specified Value: 75.95 to 76.05 kHz

Adjustment Location: MAIN board (See page 12)

SECTION 5

ELECTRICAL ADJUSTMENTS

TUNER SECTION 0 dB=1 µV

[MW/LW]

Setting:

Function : RADIO

Band switch: MW or LW

[FM]

Setting:

Function : RADIO

Band switch: FM

• Repeat the procedures in each adjustment several times, and the

frequency coverage and tracking adjustments should be finally

done by the trimmer capacitors.

• Remove FM antenna in FM adjustments.

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.

–

level meter

set

Ω

(headphone) jack (J301

)

FM RF signal

generator

22.5 kHz frequency

deviation by 400 Hz

signal

Output level: as low as possible

–

level meter

(headphone) jack (J301

)

set

Ω

0.01

MAIN board

TP12 (FM IN)

digital voltmeter

100 k

Ω

MAIN board

TP53 (VT)

FM RF SSG

Carrier frequency: 98 MHz

Modulation: 400 Hz, 30% FM modulation

Output level: 0.1 V (100 dB)

MAIN board

TP12 (FM IN)

0.01

Fset

TP8 (VCO) +

–

frequency counter

33 k

Ω

TP7 (+B)

MAIN board

– 9 –

CD SECTION

Note:

Tracking Balance Adjustment and Tracking Gain Adjustment are

done automatically in this set.

TEST MODE

1. Press the CD LID OPEN/CLOSE DET switch (S424) on the

PUSH SWITCH board.

2. Under standby condition (when the clock appears in the dis-

play), short the BP (CD TESTAUTO).

Note: If the power is supplied to the microprocessor once, it is backed up

for 3 minutes, therefore the TEST mode will not be activated within

3 minutes even if the power is turned on again. In this case, short

instantaneously the BP (CD TEST MANUAL).

3. Press the ﬂkey, and the focus search is repeated.

At this time, check that the optical pick-up objective lens moves

smoothly without a sticking or noise.

4. Load the test disc (YEDS-18: Part No. 3-702-101-01), and per-

form automatic adjustment after the focus search succeeded.

5. After automatic adjustment is finished, move the sled motor

to the center. At this time, keep pressing the +and =

keys to confirm that optical pick-up moves smoothly via most

inside track →most outside track →most inside track with-

out a sticking or noise.

6. Confirm the traverse waveform.

7. Press the [WAKEUPTRACK] key.

8. The tracking servo and the sled servo are turned on, the mute

is cancelled.

9. Playback the 2nd track.

10. Adjust the RF and jitter waveforms.

Connecting points: MAIN Board (See page 12)

Focus Bias Adjustment

This adjustment is to be done when the optical block is replaced.

Connection:

Adjustment Procedure:

1. Connect the oscilloscope to TP504 (VREF) and TP503 (RF)

on the MAIN board.

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

ﬂkey to play.

3. Move the optical pick-up to the music area on the disc to en-

able easy visibility of the eye pattern by +or =key

pressing.

4. Adjust RV501 so 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)

Adjustment Location: MAIN Board (See page 12)

MAIN board

TP503 (RF)

TP504 (VREF)

–

oscilloscope

(AC range)

VOLT/DIV: 0.2 V

TIME/DIV: 500 ns

1.3

0.5 Vp-p

When observing the eye pattern, set the oscilloscope

for AC range and raise vertical sensitivity.

– 10 –

Focus Gain Adjustment

A frequency response analyzer is necessary in order to perform

this adjustment exactly.

However, this gain has a margin, so even if it is slightly off, there

is no problem. Therefore, do not perform this adjustment.

Focus gain determines the optical pick-up follow-up (vertical and

horizontal) relative to mechanical noise and mechanical shock

when the 2-axis device operate.

However, as these reciprocate, the adjustment is at the point where

both are satisfied.

• When gain is raised, the noise when the 2-axis device operates

increases.

• When gain is lowered, mechanical shock and skipping occurs

more easily.

• When gain adjustment is off, the symptoms below appear.

The following is a simple adjustment method.

– Primary Adjustment –

Note: Since exact adjustment cannot be performed, remember the posi-

tions of the controls before performing the adjustment. If the posi-

tions after the primary adjustment are only a little different, return

the controls to the original position.

Connection:

• The time until music starts becomes longer for

STOP →PLAY or automatic selection.

(=, +buttons pressed)

(Normally takes about 2 seconds)

• Music does not start and disc continues to

rotate for STOP →PLAY or automatic

selection.

(=, +buttons pressed)

• Sound is interrupted during PLAY.

Or time counter display stops progressing.

• More noise during 2-axis device operation

Gain Focus

Symptoms

low

–

high

Procedure:

1. Keep the set horizontal.

If the set is not horizontal, this adjustment cannot be per-

formed due to the gravity against the 2-axis device

2. Insert the test disc (YEDS-18) and press the ﬂbutton.

3. Connect the oscilloscope BT (FEO) and TP504 (VREF) on

the MAIN board.

4. Adjustment RV502 on the MAIN board so that the waveform

is as shown in the figure below.

• Incorrect Examples (DC level changes more than on adjusted

waveform)

)

(

VOLT/DIV: 100 mV

TIME/DIV: 2 mS

100 mV

0 V

VOLT/DIV: 100 mV

TIME/DIV: 2 mS

200 mV

0 V

VOLT/DIV: 100 mV

TIME/DIV: 2 mS

75 mV

0 V

low focus gain

high focus gain

MAIN board

BP (FEO)

TP504 (VREF)

–

oscilloscope

Adjustment Location: MAIN Board (See page 12)

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