Sony DF-20 Service manual

D-F20

SERVICE MANUAL

Ver 1.0 2001.05

SPECIFICATIONS

US Model

Model Name Using Similar Mechanism D-E220/E225/E226CK

CD Mechanism Type CDM-3123EBA

Optical Pick-up Name DAX-23E

CD player System

Compact disc digital audio system

Laser diode properties

Material: GaAlAs Wavelength: λ = 780 nm Emission duration: Continuous Laser output: Less than 44.6 µW (This output is the value measured at a distance of 200 mm from the objective lens surface on the optical pick-up block with 7 mm aperture.)

D-A conversion

1-bit quartz time-axis control

Frequency response

20 - 20,000 Hz +1/–2 dB (measured by EIAJ CP-307)

Output (at 4.5 V input level)

Headphones (stereo minijack)

Approx. 12 mW + Approx. 12 mW at 16 ohms

Radio Frequency range (STEP switch)

9 kHz step: FM: 87.5 - 108.0 MHz AM: 531 - 1,710 kHz 10 kHz step: FM: 87.5 - 108.0 MHz AM: 530 - 1,710 kHz

Antenna

FM: Headphones cord antenna AM: Built-in ferrite bar antenna

General Power requirements

For the area code of the model you purchased, check the upper left side of the bar code on the package.

• Two LR6 (size AA) batteries: 3 V DC

• AC power adaptor (DC IN 4.5 V jack): 120 V, 60Hz

Battery life* (approx. hours)

(When you use the CD player on a flat and stable surface.) Playing time varies depending on how the CD player is used.

When using ESP RADIO

Two sony alkaline 24 25 66 batteries LR6(SG)

* Measured value by the standard of JEITA

(Japan Electronics and Information Technology Industries Association).

** Charging time varies depending on how the

rechargeable battery is used.

Operating temperature

5°C - 35°C (41°F - 95°F)

Dimensions (w/h/d) (excluding projecting parts and controls)

Approx. 161 × 26.3 × 130.3 mm

3/8 × 1 1/16 × 5 1/4 in.)

Mass (excluding accessories)

Approx. 210 g (7.5 oz.)

Supplied accessories

For the area code of the location in which you purchased the CD player, check the upper left side of the bar code on the package.

Headphones (1)

Design and specifications are subject to change without notice.

on off on

9-873-148-01

2001E0400-1

FM/AM PORTABLE CD PLAYER

Sony Corporation

Personal Audio Company

Shinagawa Tec Service Manual Production Group

D-F20

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.

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.

1. SERVICE NOTE ................................................................. 3

2. GENERAL

Getting started ......................................................................... 4

3. DISASSEMBLY

3-1. “Lid, Battery Case”, Cabinet (Front) Assy.......................... 5

3-2. Lid Assy, Upper ................................................................... 5

3-3. Main Board, MD Assy ........................................................ 6

3-4. Optical Pick-up, Motor ....................................................... 6

4. ELECTRICAL ADJUSTMENTS

Tuner Section........................................................................... 7

CD Section .............................................................................. 8

5. DIAGRAMS

5-1. IC Pin Descriptions ............................................................. 9

5-2. Block Diagram –CD Section– ........................................... 13

5-3. Block Diagram –Tuner Section– ....................................... 14

5-4. Block Diagram –Power Supply Section– .......................... 15

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

5-6. Schematic Diagram –Main Section (1/3)– ......................... 18

5-7. Schematic Diagram –Main Section (2/3)– ......................... 19

5-8. Schematic Diagram –Main Section (3/3)– ......................... 20

5-9. IC Block Diagrams ............................................................ 21

6. EXPLODED VIEWS

6-1. Cabinet (Front) Section ..................................................... 24

6-2. Cabinet (Lower) Section ................................................... 25

6-3. CD Mechanism Deck Section (CDM-3123EBA) ............. 26

7. ELECTRICAL PARTS LIST ......................................... 27

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.

SECTION 1

SERVICE NOTE

D-F20

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic breakdown because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic breakdown 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.

Precautions for Checking Emission of Laser Diode

Laser light of the equipment is focused by the object lens in the optical pick-up so that the light focuses on the reflection surface of the disc. Therefore, be sure to keep your eyes more then 30 cm apart from the object lens when you check the emission of laser diode.

Before Replacing the Optical Pick-Up Block

Please be sure to check throughly the parameters as par the “Optical Pick-Up Block Checking Procedures” (Part No.: 9-960-027-

11) issued separately before replacing the optical pick-up block. Note and specifications required to check are given below.

• FOK output : IC601 eg pin

When checking FOK, remove the lead wire to disc motor.

• RF signal P-to-P value : 0.45 ± 0.1 Vp-p

• The repairing grating holder is impossible.

Laser Diode Checking Methods

During normal operation of the equipment, emission of the laser diode is prohibited unless the upper lid is closed while turning ON the S801. (push switch type) The following two checking methods for the laser diode are operable.

• Method: Emission of the laser diode is visually checked.

1. Open the upper lid.

2. With a disc not set, turn on the S801 with a screwdriver having a

thin tip as shown in Fig.1. or TAP802 is shorted as shown in Fig.2. Note: Do not push the detection lever strongly, or it may be bent

or damaged.

3. Press the N X button.

4. Observing the objective lens, check that the laser diode emits

light. When the laser diode does not emit light, automatic power control circuit or optical pick-up is faulty. In this operation, the objective lens will move up and down 5 times along with inward motion for the focus search.

S801

– MAIN BOARD (SIDE B) –

S801

CD DOOR

OPEN

FERRITE-

ROD

ANTENNA

S801

– MAIN BOARD (SIDE A) –

Fig. 1

RF-IN

detection lever

main board

S811

SOUND/ PRESET

–

TAP802

Fig. 2

D-F20

SECTION 2

GENERAL

This section is extracted from instruction manual.

SECTION 3

DISASSEMBLY

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

3-1. “LID, BATTERY CASE”, CABINET (FRONT) ASSY

B 2x10

cabinet (upper) ass

D-F20

3-2. LID ASSY, UPPER

claws

B 2x10

lid, battery case

lid assy, upper

claws

boss

claws

cabinet (front) ass

D-F20

)

3-3. MAIN BOARD, MD ASSY

Note: When installing, fit the knob (HOLD) and S803.

CN501

MAIN board

cabinet (lower) sub assy

CN503

CN502

MD assy

S803

S812

S813

terminal (–), battery (BT402)

terminal (+.–), battery (BT400

3-4. OPTICAL PICK-UP, MOTOR

motor assy, sled (M501)

gear (B)

cover, gear

knob (HOLD)

B 1.7x5

motor assy, turntable (M502)

chassis

screw (feed) assy

retainer, shaf

P 1.4x3.5

shaft, standard

pick-up block, optical

rack

B 1.4x2.3

)

SECTION 4

ELECTRICAL ADJUSTMENTS

D-F20

TUNER SECTION 0 dB = 1 µV

• FM Section

Setting:

RADIO ON•BAND/MEMORY button : FM STEP switch : 10k

FM RF signal generator

0.01

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

• AM Section

Setting:

RADIO ON•BAND/MEMORY button : AM STEP switch : 10k

AM RF signal generator

Put the lead-wire antenna close to the set.

TP3 (RF-IN)

set

FM FREQUENCY COVERAGE

CHECK

Frequency Display 87.5 MHz 108 MHz

Reading on Digital voltmeter 2.5 ± 1.5 V 7.0 ± 4.0 V

Adjustment Part <confirmation> <confirmation>

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L2 CT1

87.5 MHz 108 MHz

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter.

450 kHz

AM FREQUENCY COVERAGE

CHECK

Frequency Display 530 kHz 1,710 kHz

Reading on Digital voltmeter 1.0 ± 0.5 V 5.2 ± 0.7 V

Adjustment Part <confirmation> <confirmation>

30% amplitude modulation by 400 Hz signal

• Connecting Level Meter (FM and AM)

level meter (range: 0.5–5 V ac

Ω

set

jack (J302)

• Connecting Digital Voltmeter (FM and AM)

digital voltmeter

Ω

100 k

TP81 (VT)

AM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L4 CT3

620 kHz 1,400 kHz

Adjustment Location: See page 8.

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

frequency coverage and tracking adjustments should be finally done by the trimmer capacitors.

• For FM adjustment, fix the FM RF coil (L1) as shown next page

and then perform tracking adjustment at L2 and CT1. Lastly check the voltage value.

• For AM adjustment, fix the ferrite-rod antenna (L3) as shown

next page and then perform tracking adjustment at L4 and CT3. Lastly check the voltage value.

D-F20

Adjustment Location:

– MAIN BOARD (SIDE A) –

CN501

AM IF ADJ

TP3

RF-IN

CT1

FM TRACKING ADJ

CT3 L4

AM TRACKING

ADJ

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 between TP629 (RF) and GND on main board.

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

3. Press the N X 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.

TP81

IC61

Test Point:

– MAIN BOARD (SIDE B) –

• RF signal reference waveform (eye pattern)

VOLT/DIV : 20 mV (10 : 1 probe in use) TIME/DIV : 500 nS

RF level :

0.1 Vp-p

0.45

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

TP629

SECTION 5

DIAGRAMS

5-1. IC PIN DESCRIPTIONS

• IC61 TC9327AF-631 (TUNER PLL, LCD DRIVER)

Pin No. Pin Name I/O Pin Description

1 – 4 COM1 – 4 O LCD driver signal output

5 – 20 S1 – 16 O LCD driver signal output

21 AM STEP-I I AM 9K/10K tuning step select signal input (initialization)

22 DEST2-I I Bit2 tuner destination setting signal input (Fixed at “L” in this set)

23 DEST1-I I Bit1 tuner destination setting signal input (Fixed at “L” in this set)

24 DEST0-I I Bit0 tuner destination setting signal input (Fixed at “L” in this set)

25 XLOCAL/XMONO-DET-I I LOCAL/DX or MONO/STEREO ON-OFF switch detect signal input

26, 27 NC — Not used. (Open)

28 LCDREQ-I I LCD display request signal input

29 LID OPEN I CD door open detect signal input

30 EEP D0/D1-IO I/O Data signal input/output for EEPROM IC.

31 EEP SK-O O Clock signal output for EEPROM IC.

32 EEP CS-O O Chip select signal output for EEPROM IC.

33 XL/O-I I Line out signal input

34, 35 NC — Not used. (Open)

36 MEM-KEY (3-BIT) I Memory key signal input (Fixed at “H” in this set)

37 PRESET KEY I Not used in this set. (Open)

38 CD ACK-I O CD acknowledge signal output

39 CDON-IWP-CDU I CD ON request signal input (Wake-up tuner in sleep mode)

40 I/O (RESERVED) — Not used. (Open)

41 NC — Not used. (Open)

42 AD1 KEY I Set keys signal input

43 AD2 RMKEY I Remote key signal input (Fixed at “L” in this set)

44 AD3 BATT HIDC I Battery/HiDC level detect signal input

45 AD DC REF I Reference DC signal input of A/D.

46 SDI-I-CDU I Serial data signal input from system control IC.

47 SDO-O-CDU (RESERVED) O Serial data signal output to system control IC.

48 SCK-I-CDU I Serial clock signal input from system control IC.

49 TUBEEP-O O Beep sound control signal output

50 NC (I/O) — Not used. (Open)

51 XHOLD-I-SW I HOLD detect signal input

52 XAVLS-I-SW I AVLS detect signal input

53 XDC IN DET-I I DC-in detect signal input

54 TU ON-O O Tuner ON request signal output

55 ST OR DX-O-CTR O LOCAL/DX or MONO/STEREO ON-OFF control signal output

56 TUBASS2-O O MEGA BASS 2 sound mode signal output (Not used in this set)

57 TU TEST MODE I Tuner test mode detect signal input

58 TUBASS1-O O MEGA BASS 1 sound mode signal output (Not used in this set)

59 AM/XFM-O O Band control FM/AM signal output to tuner IC.

60 +B ON/OFF O Radio power ON/OFF signal output

61 IFREQ-O O IF request signal output

62 TUMUTE-O O Mute HP control signal output

63 TEST — Not used. (Open)

64 IFIN I FM/AM IF signal input

65 EO (DO1) O PLL error signal output

66 NC (DO2) — Not used. (Open)

67 HOLD I Not used. (Connect to ground in this set)

68 NC — Not used. (Open)

69 GND — Ground

70 FM IN I FM oscillation signal input

D-F20

Pin No. Pin Name I/O Pin Description

71 AM IN I AM oscillation signal input

72 VDD (1.8-2.2V) — Power supply pin

73 RESET I Power reset signal input

74 XOUT O Crystal oscillation signal output (75 kHz)

75 XIN I Crystal oscillation signal input (75 kHz)

76 VXT — Crystal oscillation signal pin

77 VLCD — LCD voltage doubler

78, 79 C1, 2 — LCD voltage doubler

80 VEE — Constant voltage output to LCD.

• IC801 TMP88CM22AF-Z3TU01 (SYSTEM CONTROL)

Pin No. Pin Name I/O Pin Description

1 VSS — Ground

2 PWRSW O Headphone AMP IC power switch signal output

3 FOK I I Focus OK signal input from DSP IC. (“L”: NG, “H”: OK)

4 AGCPWM O O AGC control pulse signal output (Not used in this set)

5 CDON O O CD ON request signal output

6 SWEN2 O O CD/tuner select signal output

7 AMUTE O O Analog audio mute ON/OFF control signal output

8 VCC2ON O — Power supply pin (Not used in this set)

9 XRST O O Reset signal output to DSP IC.

10 SCK O O Serial data transfer clock signal output to DSP IC.

11 (SENS) SDTI I I Serial data signal input from DSP IC.

12 SDTO O O Serial data signal output to DSP IC.

13 SLPOUT O O WAKE-UP control signal output

14 AD CDTEST I CD test signal input (“L”: CD test) (Fixed at “H” in this set)

15 AD CHGMNT I Not used in this set. (Open)

16 AD RMKEY I Not used in this set. (Fixed at “L”)

17 AD BATMNT I Battery voltage detect signal input

18 AD CDKEY I Key signal input

19 AD RM INT I Not used in this set. (Open)

20 AD DCINMNT I DC-in voltage detect signal input (A/D input) and DC-in jack use/no use detect signal input.

21 WP OPEN I CD door open switch signal input

22 VREFL I Reference voltage signal input (0 V) for A/D converter.

23 VREFH I Reference voltage signal input (+2 V) for A/D converter.

24 VDD — Power supply pin (+2 V)

25 SCOR I I Sub-code sync (S0+S1) detect signal input from DSP IC.

26 GRSCOR I I GRSCOR signal input from DSP IC.

27 WFCK I I WFCK signal input from DSP IC.

28 BEEP O O Beep sound signal output to headphone AMP IC.

29 XCDRESET TU O O Reset signal output to DSP IC.

30 TUSCK O O Communication clock signal output to DSP IC.

31 (CD) SDI I I Communication data bus signal input from DSP IC.

32 (CD) SDO O O Communication data bus signal output to DSP IC.

33 RESERVE — Not used. (Open)

34 ACK CD I I CD acknowledge signal input

35 TUON I I Tuner ON request signal input

36 ESP I ESP switch signal input

37 L/O I I Line out signal input

38 AVLS I I AVLS switch signal input

39 HOLD I I HOLD switch signal input

40 CD-RW I Not used in this set. (Open)

41 ——Not used. (Open)

42 XHGON O O Not used in this set. (Open)

43 XTL O O Serial data latch pulse signal output

44 XSOE O O Serial data output enable signal output

45 TUVCPU O O Not used in this set. (Open)

46 POWLT O O Latch signal output to power control IC.

47 TUAUDIO O O Not used in this set. (Open)

48 XAPC OFF O O APC mute signal output (“L”: mute)

49 CDAUDIO O O Not used in this set. (Open)

50 RESERVE — Not used. (Open)

D-F20

+ 23 hidden pages

Sony DF-20 Service manual

TABLE OF CONTENTS

SERVICE NOTE

GENERAL

DISASSEMBLY

lid assy, upper

ELECTRICAL ADJUSTMENTS

CD SECTION

DIAGRAMS