Sony Walkman D-F20 User manual
1
Model Name Using Similar Mechanism D-E220/E225/E226CK
CD Mechanism Type CDM-3123EBA
Optical Pick-up Name DAX-23E
SERVICE MANUAL
US Model
D-F20
FM/AM PORTABLE CD PLAYER
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
SPECIFICATIONS
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
on off on
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
(6 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.
Ver 1.0 2001.05
9-873-148-01
2001E0400-1
© 2001.5
Sony Corporation
Personal Audio Company
Shinagawa Tec Service Manual Production Group
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2
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.
TABLE OF CONTENTS
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
D-F20
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE
WITH MARK 0ON 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.
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3
D-F20
SOUND/
PRESET
–
S811
L3
AM
FERRITE-
ROD
ANTENNA
S801
CD DOOR
OPEN
S801
– MAIN BOARD (SIDE B) –
RF-IN
TAP802
–MAIN BOARD (SIDE A) –
SECTION 1
SERVICE NOTE
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static 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 “Opti-
cal 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 NXbutton.
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.
detection lever
detection lever
main board
S801
Fig. 2
Fig. 1
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5
D-F20
Note : Follow the disassembly procedure in the numerical order given.
3-2. LID ASSY, UPPER
SECTION 3
DISASSEMBLY
3-1. “LID, BATTERY CASE”, CABINET (FRONT) ASSY
1
B 2x10
3
B 2x10
4
claws
0
cabinet (upper) ass
y
5
claws
6
claws
7
claws
8
9
2
lid, battery case
boss
1
claws
2
lid assy, upper
cabinet (front) ass
y
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6
D-F20
3-3. MAIN BOARD, MD ASSY
3-4. OPTICAL PICK-UP, MOTOR
1
CN501
4
MD assy
7
MAIN board
cabinet (lower) sub assy
knob (HOLD)
terminal (+.–), battery (BT400
)
terminal (–), battery (BT402)
S803
2
CN502
5
S812
6
S813
3
CN503
1
B 1.7x5
3
B 1.7x5
7
P 1.4x3.5
9
B 1.4x2.3
0
rack
8
retainer, shaf
t
qa
screw (feed) assy
qd
shaft, standard
qs
pick-up block, optical
4
cover, gear
2
motor assy, turntable (M502)
5
motor assy, sled (M501)
chassis
6
gear (B)
Note: When installing, fit the knob (HOLD) and S803.
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7
D-F20
digital
voltmeter
100 k
Ω
TP81 (VT)
i
jack (J302)
set
16
Ω
level meter
(range: 0.5–5 V ac
)
Put the lead-wire
antenna close to
the set.
AM RF signal
generator
TP3 (RF-IN)
FM RF signal
generator
0.01
µ
F
set
TUNER SECTION 0 dB = 1 µV
• FM Section
Setting:
RADIO ON•BAND/MEMORY button : FM
STEP switch : 10k
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
30% amplitude
modulation by
400 Hz signal
• Connecting Level Meter (FM and AM)
• Connecting Digital Voltmeter (FM and AM)
• 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.
Adjustment Location: See page 8.
SECTION 4
ELECTRICAL ADJUSTMENTS
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.
T1
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>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4 CT3
620 kHz 1,400 kHz
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8
D-F20
TP629
RF
–MAIN BOARD (SIDE B) –
Adjustment Location:
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 NXbutton.
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)
Test Point:
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
CN501
IC61
TP81
VT
TP3
RF-IN
–MAIN BOARD (SIDE A) –
CT3 L4
L3
L1
CT1
L2 FM TRACKING ADJ
AM IF ADJ
T1
AM TRACKING
ADJ
RF level :
0.45
±
0.1 Vp-p
VOLT/DIV : 20 mV (10 : 1 probe in use)
TIME/DIV : 500 nS
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9
D-F20
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
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10
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.
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11
D-F20
•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)
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12
D-F20
Pin No. Pin Name I/O Pin Description
51 BASS1 O O Not used. (Fixed at “H”in this set)
52 BASS2 O O Not used. (Fixed at “H”in this set)
53 LCDREQ O O LCD display request signal output
54 –64 SEG10 –0 O Not used in this set. (Open)
65 –68 COM3 –0 O Not used in this set. (Open)
69 –71 V3 –1 O Not used in this set. (Open)
72, 73 C1, 0 O Not used in this set. (Open)
74 CDWP I I WAKE-UP control signal input
75 ICTEST I Test pin for IC. (Fixed at “L”in this set)
76 ——Not used. (Open)
77 ——Not used. (Fixed at “L”in this set)
78 RESET I I System reset signal input from power control IC. (“L”: reset)
79 XIN I I System clock signal input
80 XOUT O Not used in this set. (Open)
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TEL 13942296513 QQ 376315150 892498299
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D-F20
13 13
5-2. BLOCK DIAGRAM — CD SECTION —
1
2
DIGITAL SIGNAL PROCESSOR,
DIGITAL SERVO PROCESSOR
IC601
13
97
104
94
93
83
78
2826 30 35
242523
3
27
2611 44
43101225
21
LPF
SIGNAL
PROCESSOR
BLOCK
MEMORY
CONTROLLER,
BUS BOOST
BLOCK
SERVO
BLOCK
• Signal path
: CD PLAY
MDS
44 MDS
MDP
43 MDP
COMP OUT
SENS
SCOR
17
SCOR
42
11
12
10
C176
SDTO
XTAI
XTAO
RFAC
XSOE
R4M
XLAT
CLOK
LOUT
ROUT
AMUTE
FOK
FOK
R4M
XSOE
WDCK
WFCK
SDTO
SENS
CLOK
XLAT
XSOE_O
GRSCOR_I
FOK_I
WFCK_I
SDTO_O
SCOR_I
(SENS)
SDTI_I
SCK_O
XLAT_O
46
47
SFDR
XRST
RFDC
B
A
2
WDCK
WFCK
XTAO
XTAI
E
F
SRDR
TRDR
FRDR
FFDR
TFDR
FFDR
FRDR
59 F
62
61
A
B
58
71
RFDC
RFAC
E
50
51
SFDR
SRDR
48
49
35
36
13
14
61
TFDR
TRDR
OPTICAL PICK-UP
BLOCK (DAX-23E)
A
A
CN501
CN503
CN502
B
RF
E
F
B
RF
E
F
PD
PD
LD
LD
DETECTOR
VCC
FOCUS
COIL
TRACKING
COIL
FI2
RI2
33
34
FI1
RI1
FI3
SAW TOOTH
MDP
VINDET
RI3
15
PWM/FI4
16
PDL/RI4
APCREF
VCC1 +2V
FO2
RO2
FO3
RO3
RF2
INM2
RF21
PAPC
F+
F–
T+
T–
+
COMPARATOR
IC401 (2/3)
SYNC
48 XAPC_OFF_O
9
XRST_O
SDTO
SCK
SYSTEM CONTROL
IC801 (1/3)
X601
16.9MHz
CD-L
CD-R
A MUTE
B
C
A
60
28
26
23
21
63
64
59
M502
SPINDLE
MOTOR
FO4
RO4
M
C+
C–
19
17
DRIVER
DRIVER
CONTROLLER
DRIVER
PD AMP
LD AMP
LD
DRIVER
Q403,405
LEVEL
SHIFTER
60
FOCUS/TRACKING COIL DRIVER,
SPINDLE/SLED MOTOR DRIVE
IC401 (1/3)
B+ +3V
62
D
115 – 118
113
114
119
120
XRAS
XWE
XCAS
XOE
D0-D3
A0-A9
4
10
1-3, 5-7, 106-109
79
XIN_I
M501
SLED
MOTOR
FO1
RO1
M
S+
S–
32
30
DRIVER
13
12
11
7
8
6
4
1
2
3
10
9
1
2
MAIN BOARD (1/3)
(Page 15)
(Page 15)
(Page 15)
(Page
14)
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TEL 13942296513 QQ 376315150 892498299
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D-F20
1414
5-3. BLOCK DIAGRAM —TUNER SECTION —
Signal path
: FM
: AM
: CD PLAY
AM
OSC
AM
MIX
FM
MIX
FM
OSC
AM
RF-IN
FM
RF-IN
FM
RF-OUT
16 15 12
11
20
22 4 6
7
10
2
21 1924
T1
CF1
L2L1 CT1
VCPU+2V
XDCDT
D1 D2
CT3
D3
L3
AM
FERRITE-ROD
ANTENNA
CT3,L4
AM
TRACKING
CT1,L2
FM
TRACKING
BUFFER
Q61
AM
DET
FM
DET
AF
BUFFER
DC/DC
CONVERTER
Q86
IF
BUFFER
FM
MPX MUTE
IF CUT
R-CH
L-OUT
R-OUT R-CH
VDD+2V
R-CH
D601
D304
D302
17
FM/AM FRONT-END,
IF DET,MPX
IC1
TU VCC
TU VCC
Q3
Q6 Q2
TU VCC
L4
CF3
IF CUT
TU VCC
TU VCC
FM OSC
AM OSC
MIX-OUT AM
IF-IN
FM
IF-IN
DET-OUT MPX-IN
T1
AM IF
LIN
HEADPHONE AMP
IC302
14 LOUT 8
PWRSW
MUTE
19
BEEP
ALCDET
17
PW SW
BEEP
MT SW
20
TUNER/CD
SIGNAL SELECT
IC303
89
12 6
11
IF OSC
AMP
Q60
LPF
Q84,85
5 –201 –4
LIQUID CRYSTAL
DISPLAY PANEL
LCD1
COM1
|
COM4
S1
|
S16
22 23 24 74 75 45 32 31 30
1 2 3
25
55 65 53 71 70 61 64 59 6 7 2 28
21
36
62 49 29
73
54
33
38
39
46
47
48
51
52
42
29
74
37
34
5
32
31
30
39
38
18
21
44
X61
75kHz
X1
10.7MHz
TU VCC
TU VCC
ST OR DX-O-CTR
XDC IN
DET-I
EO(DO1)
AM IN
FM IN
60
+B ON/OFF-O
DEST2-I
DEST1-I
DEST0-I
XOUT
CS
SK
DI
XIN
AD DC REF
EEP CS-O
EEP SK-O
EEP DO/D1-IO
XLOCAL/XMONO-DET-I
AM STEP-I
IFREQ-O
IF IN IF-OUT
OSC-OUT
LPF2(MAX/FM)
LPF1(MONO/ST)
AM/XFM-O
TUMUTE-O
TUBEEP-O
LID OPEN
HOLD
AVLS
SWEN2_O
AMUTE_O
PWRSW
BEEP_O
RESET XCDRESET_TU-O
CDWP_I
L/O_I
ACK_CD_I
CDON_O
(CD)SDO_O
(CD)SDI_I
TUSCK_I
HOLD_I
AVLS_I
AD3_BATT_HIDC
AD_CDKEY
SDI-I-CDU
SDO-O-CDU
SCK-I-CDU
XHOLD-I-SW
XAVLS-I-SW
AD1_KEY
HIGH/BATT
TU ON-O
XL/O-I
CD ACK-I
WP_OPEN
ESP
CDON-IWP-CDU
12
10
13 14
+1.6V REG.
IC81
B+ SWITCH
Q4,5
B+ +3V
VCPU+2V
TU VCC
S813
(LOCAL/DX)
S812
STEP
9k 10k
AVLS
S802
S801
(CD DOOR OPEN)
VCPU+2V
OPEN
AVLS
HOLD
NORM
LIMIT
HOLD
S803
OFF
ON
ESP
S804
OFF
ON
LOCAL DX
R-CH
A MUTE
CD-L
CD-R
T81
D80
KEY MATRIX
S805 - 811
VOLUME
RV301
D
E
F
MAIN BOARD (2/3)
EEPROM
IC62
TU VCC
TUNER PLL,
LCD DRIVER
IC61
OPEN
SYSTEM CONTROL
IC801 (2/3)
J302
i
(Page 13)
(Page 15)
(Page 15)
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TEL 13942296513 QQ 376315150 892498299
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D-F20
15 15
5-4. BLOCK DIAGRAM —POWER SUPPLY SECTION —
SWITCHING
POWER
CIRCUIT 2
SWITCHING
POWER
CIRCUIT 5
CHARGE
CONTROL
B+ SWITCH
Q410
B+ SWITCH
Q406
B+
SWITCH
Q412
CHARGE
SWITCH
INTERFACE
CLK
OR OSC
AMP
BIAS
SAWTOOTH
GENERATOR
STANDBY
REFERENCE
GATE
Q402
DC IN
DETECT
Q407
COMPARATOR
Q413
SWITCH
Q401
45
49
42
5
6
8
7
9
53
38
40
41
1
2
37
CHG ON/OFF
BANDGAP
REFERENCE
(VREF)
4
SYSTEM CONTROL
IC801 (3/3)
17 20
58
46
13
POWLT_O
SLPOUT_O
AD_BATMNT
78
RESET_I
AD_DCINMNT
VCPU +2V
VDD +2V
VCC1+2V
POWER CONTROL
IC401 (3/3)
B+
B–
WAKE-UP RESET
SWITCH
Q408,409
J401
DC IN 4.5V
!
DTC1D
VCPU2 (2.0V)
VCPU1 (2.5V)
48 INP1
54 STNG
VIN
CHGSW
RS
DCIN
RF4
DC IN
L4
VG
VG
43
VLGO1
SYNC
VCC1(2.5V)
WAKEUP
CLOCK
DATA
SYNC
SCK
SDTO
LATCH
RSTB
VREF
VCPU1 (2.5V)
VCPU2 (2.0V)
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION LR6)
2PCS,3V
D407
D801
A
B
C
B+ +3V
FOCUS/TRACKING COIL DRIVER
SPINDLE/SLED MOTOR DRIVER
(IC401) +3V,
HEADPHONE AMP
(IC302) +3V
D405
D406
L408
D401
L412
F
E
44 VCC1
Q411
HIGH/BATT
XDCDT
MAIN BOARD (3/3)
(Page 13)
(Page 13)
(Page 13)
(Page 14)
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D-F20
1616
5-5. PRINTED WIRING BOARD —MAIN SECTION —
Common Note on Printed Wiring Boards:
•X: parts extracted from the component side.
•Y: parts extracted from the conductor side.
•a: Through hole.
•f: internal component.
•: Pattern from the side which enables seeing.
Common Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ωand 1/4W or less unless otherwise
specified.
• % : indicates tolerance.
•f: internal component.
•C: panel designation.
•A: B+ Line.
• Total current is measured with CD installed.
• Power voltage is dc 4.5 V and fed with regulated dc power
supply from external power voltage jack.
• Voltages and waveforms are dc with respect to ground in
playback mode.
no mark : FM
( ) : AM
< > : CD
∗: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F: FM
f: AM
J: CD
Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B) pattern face are indicated.
Parts face side: Parts on the parts face side seen from the
(Side A) parts face are indicated.
•Semiconductor
Location (Side A)
D1 G-4
D80 H-8
D82 H-8
D301 G-2
D302 G-2
D303 F-2
D304 F-2
D408 H-6
D461 H-6
D801 H-6
IC61 I-6
Q84 H-4
Q85 I-4
Q401 G-9
Q402 G-9
Q403 F-2
Q405 E-2
Q412 I-8
Ref. No. Location
1
A
B
C
D
E
F
G
H
I
J
2345678910
OPTICAL
PICK-UP
BLOCK
(DAX-23E)
1-681-838-
1 BLK
2 WHT
M502
SPINDLE
MOTOR
S803
HOLD
1 BLK
2 WHT
M501
SLED
MOTOR
OFF ON
RF-IN
Note: The components identified by mark 0or dotted line
with mark 0are critical for safety.
Replace only with part number specified.
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D-F20
17 17
•Refer to page 16 for Common note on Printed Wiring Board.
IC61 uf (XOUT)
•Waveforms (CD play mode)
1
0.7Vp-p
IC601 ih (LRCK)
2
Q86 C
3
TP629 (RF)
4
2.0Vp-p
5
IC601 of (XTAO)
2.0Vp-p
6
IC801 ul (XIN_1)
3.6Vp-p
0.235µsec
200mV/div 5µsec/div
3.6Vp-p
1V/div 0.2µsec/div
100mV/div 0.5µsec/div
22.5µsec
500mV/div 5µsec/div
16.9MHz
500mV/div 0.02µsec/div
1V/div 0.2µsec/div
1
A
B
C
D
E
F
G
H
I
J
234567891011
LCD1
LIQUID CRYSTAL DISPLAY PANEL
DC IN 4.5V
J401
!
TUNE +
S808
>
TUNE –
S809
.
MENU/
PRESET
+
S810
SOUND/
PRESET
–
S811
RADIO ON
BAND/MEMORY
S806
VOLUME
S807
RADIO OFF
x
S805
NX
RV301
L3
AM
FERRITE-
ROD
ANTENNA
1-681-838-
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION LR6)
2PCS,3V
LIMIT
NORM AVLS
ON
OFF
J302
ESP
S813
(LOCAL/DX)
LOCAL
DX
S812
9k
10k
STEP
S801
CD DOOR
OPEN
33
48
16
1732
6449
1
IC401
•Semiconductor Location (Side B)
D2 H-5
D3 H-3
D401 G-9
D402 E-7
D404 G-9
D405 E-7
D406 H-6
D407 E-6
D409 H-6
D415 E-6
D601 C-5
D602 C-5
IC1 G-5
IC62 I-6
IC81 I-5
IC302 G-2
IC303 G-2
IC401 H-7
Ref. No. Location Ref. No. Location
IC601 C-4
IC801 B-6
Q2 G-6
Q3 E-5
Q4 E-6
Q5 D-6
Q6 G-6
Q60 I-5
Q61 I-6
Q86 H-9
Q406 D-7
Q407 E-7
Q408 H-6
Q409 H-6
Q410 E-6
Q411 G-8
Q413 E-7
75kHz
34nsec
0.45Vp-p
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D-F20
1818
5-6. SCHEMATIC DIAGRAM —MAIN SECTION (1/3) —•Refer to page 17 for Waveforms.
•Refer to page 21 for IC Block Diagrams.
•Refer to page 16 for Common Note on Schematic Diagram.
IC B/D
15
631
68
2SC4116YG-TE85L
(Page 19)
(Page 20)
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D-F20
19 19
5-7. SCHEMATIC DIAGRAM —MAIN SECTION (2/3) —•Refer to page 17 for Waveforms.
•Refer to page 21 for IC Block Diagrams.
•Refer to page 16 for Common Note on Schematic Diagram.
IC B/D
IC B/D
4.7
4.7
10
(Page 20)
(Page 18)
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D-F20
2020
IC B/D
0
0
5-8. SCHEMATIC DIAGRAM —MAIN SECTION (3/3) —•Refer to page 17 for Waveforms.
•Refer to page 22 for IC Block Diagrams.
•Refer to page 16 for Common Note on Schematic Diagram.
(Page 19)
(Page 18)
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
Table of contents
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