Sony CFD-S250L User manual

1
CD Model Name Using Similar Mechanism CFD-S200L
Section CD Mechanism Type KSM-213RDP
Optical Pick-up Name KSS-213R
TC Model Name Using Similar Mechanism CFD-S200L
Section Tape Transport Mechanism Type MF-S200
SERVICE MANUAL
CFD-S250L
CD RADIO CASSETTE-CORDER
CD player section
System
Compact disc digital audio system
Laser diode properties
Material: GaAlAs
Wave length: 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.)
Spindle speed
200 r/min (rpm) to 500 r/min (rpm) (CLV)
Number of channels
2
Frequency response
20 - 20,000 Hz +1/–2 dB
Wow and flutter
Below measurable limit
Radio section
Frequency range
FM: 87.5 - 108 MHz
MW:531 - 1,611 kHz (9 kHz step)
530 - 1,610 kHz (10 kHz step)
LW: 153 - 279 kHz
IF FM: 10.7 MHz
MW/LW: 450 kHz
Aerials
FM: Telescopic aerials
MW/LW: Built-in ferrite bar aerials
SPECIFICATIONS
– Continued on next page –
Cassette-corder section
Recording system
4-track 2 channel stereo
Fast winding time
Approx. 120 sec. with Sony cassette C-60
Frequency response
TYPE I (normal): 80 - 10,000 Hz
General
Speaker
Full range: 10 cm dia.,
3.2 Ω, cone type (2)
InputLINE IN jack (stereo minijack)
Minimum input level 330 mV
Outputs
Headphones jack (stereo minijack)
For 16 - 68 Ωimpedance headphones
OPTICAL DIGITAL OUT (CD)
(Optical output connector)
Wavelength: 630 – 690 nm
Maximum power output
5.2 W
Ver 1.1 2004. 09
9-877-083-02
2004I04-1
© 2004. 09
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
AEP Model
UK Model

2
Power requirements
For CD radio cassette-corder:
230 V AC, 50 Hz
9 V DC, 6 size D (R20) batteries
For remote control
3 V DC, 2 size AAA (R03) batteries
Power consumption
AC 20 W
Battery life
For CD radio cassette-corder:
FM recording
Sony R20P: approx. 13.5 h
Sony alkaline LR20: approx. 20 h
Tape playback
Sony R20P: approx. 7.5 h
Sony alkaline LR20: approx. 15 h
CD playback
Sony R20P: approx. 2.5 h
Sony alkaline LR20: approx. 7 h
Dimensions
Approx. 386 ×173 ×269 mm (w/h/d)
(incl. projecting parts)
MassApprox. 3.5 kg (incl. batteries)
Supplied accessories
Main lead (1)
Remote control (RMT-CS200AD) (1)
Design and specifications are subject to change without
notice.
CFD-S250L
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.
CAUTION
Use of controls or adjustments or performance of proce-
dures other than those specified herein may result in haz-
ardous radiation exposure.
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 dam-
aged by heat.
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.
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 objective lens.

3
TABLE OF CONTENTS
1. SERVICING NOTES......................................................... 4
2. GENERAL............................................................................ 5
3. DISASSEMBLY
3-1. Cabinet (Upper) Assy .......................................................... 7
3-2. Cabinet (Front) Assy, Cabinet (Rear) Assy .........................7
3-3. Wires ................................................................................... 8
3-4. MD Block............................................................................ 8
3-5. Holder (Cassette)................................................................. 9
3-6. LCD Board .......................................................................... 9
3-7. Main Board ....................................................................... 10
3-8. Tuner Board....................................................................... 10
3-9. Power Board ...................................................................... 11
3-10. CD Lid............................................................................... 11
3-11. CD Block Assy .................................................................. 12
3-12. Optical Pick-up ................................................................. 12
3-13. R/P Head (HRP301), TC Board ........................................ 13
3-14. Motor Assy (M801), Main Belt (B), Sub Belt (B) ............ 13
4. MECHANICAL ADJUSTMENTS............................... 14
5. ELECTRICAL ADJUSTMENTS
Tape Section .......................................................................... 14
Tuner Section......................................................................... 15
CD Section ............................................................................ 16
6. DIAGRAMS
6-1. IC Pin Description............................................................. 17
6-2. Circuit Boards Location .................................................... 17
6-3. Block Diagram – CD Section –......................................... 18
6-4. Block Diagram – Main Section –...................................... 19
6-5. Printed Wiring Board – CD Section – ............................... 20
6-6. Schematic Diagram – CD Section –.................................. 21
6-7. Printed Wiring Board – Tuner Section – ........................... 22
6-8. Schematic Diagram – Tuner Section – .............................. 23
6-9. Printed Wiring Boards – Main Section – .......................... 24
6-10. Schematic Diagram – Main Section (1/2) – ...................... 25
6-11. Schematic Diagram – Main Section (2/2) – ...................... 26
6-12. Printed Wiring Board – TC Section – ............................... 27
6-13. Schematic Diagram – TC Section – ..................................28
6-14. Printed Wiring Boards – Control Section –....................... 29
6-15. Schematic Diagram – Control Section – ........................... 30
6-16. Printed Wiring Boards – Power Supply Section – ............ 31
6-17. Schematic Diagram – Power Supply Section –................. 32
6-18. IC Block Diagrams............................................................ 33
7. EXPLODEDVIEWS
7-1. Main Section ..................................................................... 36
7-2. Cabinet (Front) Section ..................................................... 37
7-3. Cabinet (Upper) (1) Section .............................................. 38
7-4. Cabinet (Upper) (2) Section .............................................. 39
7-5. Cabinet (Rear) Section ...................................................... 40
7-6. Tape Mechanism Section .................................................. 41
7-7. CD Mechanism Section .................................................... 42
8. ELECTRICAL PARTS LIST......................................... 43
CFD-S250L

4
CFD-S250L
CHUCK PLATE JIG ON REPAIRING
On repairing CD section, playing a disc without the lid (CD), use
Chuck Plate Jig.
• Code number of Chuck Plate Jig: X-4918-255-1
SECTION 1
SERVICING NOTES
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
1. Turn ON the [OPERATE] button and press [CD] button to CD
position.
2. Open the CD lid.
3. Turn on S801 with screwdriver, etc. as following figure.
4. Press the N X (CD) button.
5. Confirm the laser diode emission while observing the objecting
lens. When there is no emission,Auto Power Control circuit or
Optical Pick-up is broken.
Objective lens moves up and down three times for focus search.
S801

5
CFD-S250L
SECTION 2
GENERAL This section is extracted
from instruction manual.
Remote Control
Location of controls
FUNCTION
BAND
u
OPERATE
(POWER)
VOL –, +*
x
.,>
PRESET –, +
MEGA BASS
VOL –, +*
., >
TUNE –, +
MODE
Number buttons
x
u*
OPERATE
SLEEP
OPR/BATT
Loading a CD
With the labeled side up
Inserting a cassette
With the side you want
to play facing you
CD
RADIO BAND
AUTO PRESET
TAPE
Display
Remote sensor
Total track number Programmed track Playing order
DE
Total playing time
Display
*The button has a tactile dot.
ZPUSH
OPEN/CLOSE
DISPLAY
ENT MEMORY
OPTICAL DIGITAL OUT (CD)
LINE
*
i
LINE IN

6
CFD-S250L
•The equipment can be removed using the following procedure.
SECTION 3
DISASSEMBLY
3-1. CABINET (UPPER) ASSY
(Page 7)
3-2. CABINET (FRONT) ASSY,
CABINET (REAR) ASSY
(Page 7)
3-11. CD BLOCK ASSY
(Page 12)
SET
3-3. WIRES
(Page 8)
3-4. MD BLOCK
(Page 8) 3-7. MAIN BOARD (Page 10)
3-5. HOLDER (CASSETTE)
(Page 9)
3-10. CD LID
(Page 11)
3-6. LCD BOARD
(Page 9)
3-8. TUNER BOARD
(Page 10)
3-13. R/P HEAD (HRP301),
TC BOARD
(Page 13)
3-14. MOTOR ASSY (M801),
MAIN BELT (B),
SUB BELT (B)
(Page 13)
3-9. POWER BOARD
(Page 11)
3-12. OPTICAL PICK-UP
(Page 12)

7
CFD-S250L
3-2. CABINET (FRONT) ASSY, CABINET (REAR) ASSY
3-1. CABINET (UPPER) ASSY
Note : Follow the disassembly procedure in the numerical order given.
3 screw (2.6)
2 screw (2.6)
4 screw (2.6)
6 CNP804
9 cabinet (upper) ass
y
7 CNP802
8 CNP808
5 connector
(S801)
holder (cassette)
CD lid
handle
1 BTP 2.6x10
1 PWH 2.6x10
3 CNP323
4 CNP302
5 CNP803
6 CNP807
7 CNP806
qs cabinet (front) assy
qd cabinet (rear) assy
2 HEADPHONE board
qa screw (2.6)
0 screw (2.6)
8 battery lid
9 screw (2.6)

8
CFD-S250L
3-4. MD BLOCK
3-3.WIRES
Put flat cable and wires between the cabinets and push them in the
grooves located at A to E in the figure to prevent disconnection
before assembling the set.
A
DE
B
Cfrom HEADPHONE board
cabinet front
cabinet rear
1 BVTP 2.6x8
2 BVTP 2.6x8
3 MD block

9
CFD-S250L
3-6. LCD BOARD
3-5. HOLDER (CASSETTE)
1 BVTP 2.6x
8
3 holder (cassette)
4 spring (cassette)
2 damper
1 BVTP 2.6x8
2 BVTP 2.6x8
3 LCD board
4 bracket (LCD board)

10
CFD-S250L
3-8.TUNER BOARD
3-7. MAIN BOARD
6 BVTP 2.6x8
7 MAIN board
3 CNP322
4 CNP902
5 CNP1
1 PWH 2.6x10
2 HEADPHONE board
1 B 3x
8
4 BVTP 2.6x8
5 claws
63
CNP1
7 TUNER board
holder (PWB TU)
2 telescopic antenna

11
CFD-S250L
3-9. POWER BOARD
3-10. CD LID
3 BVTP 2.6x8
4 BVTP 2.6x8
5 BVTP 2.6x8
6 POWER board
1 CNP902
2 CNP901
3 CD lid
1 claw
spring (CD)
2 claw

12
CFD-S250L
3-12. OPTICAL PICK-UP
3-11. CD BLOCK ASSY
2 PWH 2.6x10
1 CNP703
5 CD block ass
y
claws
claws
3 PWH 2.6x10
4 CD cover
2 PWB tapping (M2
)
1 gear (A)
claw
3 PWB tapping (M2)
5 sled shaft
6 optical pick-up
4

13
CFD-S250L
3-14. MOTOR ASSY (M801), MAIN BELT (B), SUB BELT (B)
3-13. R/P HEAD (HRP301),TC BOARD
2 BVTT 2x4
1 R/P head (HRP301)
3 TC boar
d
4 Removal the solders.
claws
lug
1 bind DT M2x6
motor bracket
2 bind DT M2x6
5 pan M2.6x4.5
3 main belt (B)
4 sub belt (B)
6 motor assy (M801
)

14
CFD-S250L
i jack (J321)
set
32
Ω
test tape
WS-48A
(3 kHz, 0 dB)
digital frequency
counter
TAPE SECTION 0 dB = 0.775 V
• Standard Output Level
Output terminal HP OUT
load impedance 32 Ω
output signal level 0.25 V (–10 dB)
•TestTape
Type Signal Used for
WS-48A 3 kHz, 0 dB tape speed adjustment
Tape Speed Adjustment
Procedure:
Mode: playback
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head pinch roller
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head magnetizer close to the erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power
supply voltage (9V) unless otherwise noted.
Torque Measurement
Mode Torque meter Meter reading
2.95 – 6.86 mN • m
FWD CQ-102C (30 – 70 g • cm)
(0.42 – 0.97 oz • inch)
FWD 0.15 – 0.53 mN • m
Back Tension CQ-102C (1.5 – 5.5 g • cm)
(0.021 – 0.076 oz • inch)
more than 5.88 mN • m
FF CQ-201B (more than 60 g • cm)
(more than 0.83 oz • inch)
more than 5.88 mN • m
REW CQ-201B (more than 60 g • cm)
(more than 0.83 oz • inch)
TapeTension Measurement
Mode Tension meter Meter Reading
FWD CQ-403A more than 100 g
(more than 3.53 oz)
SECTION 5
ELECTRICAL ADJUSTMENTS
SECTION 4
MECHANICAL ADJUSTMENTS
Adjust so that the value on the digital frequency counter is
3,000 Hz.
Specification Value:
Digital frequency counter
2,940 to 3,060 Hz
Adjust so that the frequency at the beginning and that at the end of
tape winding are between 2,970 to 3,030 Hz.
Adjustment Location:
Tape speed adjustment
control inside motor

15
CFD-S250L
digital
voltmeter
100 kΩ
TP (VT)
ijack (J321)
set
32 Ω
level meter
(range: 0.5–5 V ac
)
Put the lead-wire
antenna close to
the set.
AM RF signal
generator
TP (FM IN)
FM RF signal
generator
0.01
µ F
set
TUNER SECTION 0 dB = 1 µV
•FM Section
Setting:
RADIO BAND•AUTO PRESET button: FM
75 kHz frequency
deviation by 1 kHz signal
output level : as low as possible
•AM Section
Setting:
RADIO BAND•AUTO PRESET button: MW or LW
30% amplitude
modulation by
400 Hz signal
•Connecting Level Meter (FM, MW and LW)
•Connecting DigitalVoltmeter (FM, MW and LW)
•Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2
10.7 MHz
FM FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display 87.5 MHz 108 MHz
Reading on Digital voltmeter 1.3 ± 0.3V 3.0 ± 0.2 V
Adjustment Part <confirmation> L2
FMTRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1 CT1
87.5 MHz 108 MHz
MW IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
450 kHz
MW FREQUENCY COVERAGE
CHECK
Frequency Display 531 kHz 1,611 kHz
Reading on Digital voltmeter 1.0 ± 0.5V 5.2 ± 0.6 V
Adjustment Part <confirmation> <confirmation>
MWTRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3-1 CT3
621 kHz 1,404 kHz
LW FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display 153 kHz 279 kHz
Reading on Digital voltmeter 0.6 ± 0.3V 5.0 ± 0.1 V
Adjustment Part <confirmation> L4
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3-2 CT5
162 kHz 261 kHz
Adjustment Location: See page 16.

16
CFD-S250L
IC701
R729
C704
R708
C711
C709
C736
C734
R709
C705
R710
R701 C703
C731
R706
R723
C708
JC703
C743
C742
C707
C739
R735
R733
R734
R736
R711
R713
C732
JW706
JW707
JW709
JW725
JW726
JW708
– CD board (conductor side) – TP
(RF)
TP
(VREF)
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 IC701 pin 4and pin qa (or
TP (RF) and TP (VREF)).
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the NX(CD) 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.
• RF signal reference waveform (eye pattern)
Test Point:
RF level :
0.85 ±0.2 Vp-p
VOLT/DIV : 50 mV (10 : 1 probe in use)
TIME/DIV : 500 nS
When observing the eye pattern, set the oscilloscope forAC range
and raise vertical sensitivity.
L4
TP (FM IN)
(CONDUCTOR SIDE)
CT1
IC1 IC2
CT3
CT5
L1
L2
T2
T1
L3-2 L3-1
– MAIN board (component side) –
L4
LW
FREQUENCY
COVERAGE
ADJUSTMENT
L2
FM
FREQUENCY
COVERAGE
ADJUSTMENT
CT5, L3-2
LW
TRACKING
ADJUSTMENT
CT3, L3-1
MW
TRACKING
ADJUSTMENT
CT1, L1
FM
TRACKING
ADJUSTMENT
T1
MW
IF
ADJUSTMENT
T2
FM
IF
ADJUSTMENT
TP (VT)
(CONDUCTOR SIDE)

CFD-S250L
17 17
SECTION 6
DIAGRAMS
Pin No. Pin Name I/O Pin Description
6-2. CIRCUIT BOARDS LOCATION
6-1. IC PIN DESCRIPTION
• IC802 uPD789477GC-A26-8BT (SYSTEM CONTROLLER)
Pin No. Pin Name I/O Pin Description
1, 2 NC — Not used. (Open)
3 to 5 VLC2 to 0 I LCD drive bias voltage input
6 to 9 COM0 to 3 O LCD drive common output
10 to 26 S0 to 16 O LCD drive segment output
27 REC I Tape record signal input H: REC
28 AC-CHK I AC power supply detection signal input L: AC in
29 CD-DOOR I CD door open/close switch input L: Close
30 S-ROCK O ROCK LED control signal output Not used. (Open)
31 S-POP O POP LED control signal output Not used. (Open)
32 S-JAZZ O JAZZ LED control signal output Not used. (Open)
33 S-VOCAL O VOCAL LED control signal output Not used. (Open)
34 LINE IN O LINE IN control signal output
35 A-MUTE O Audio mute output H: Mute
36 CD O CD function output H: CD
37 TAPE O Tape function output H: Tape
38 AVDD — Analog power supply pin for A/D converter (+3.3 V)
39 BTT-CHK-H I Battery check input for Hi-voltage
40 BTT-CHK-M I Battery check input for Mid-voltage
41 V CHECK I Voltage check input Not used. (Open)
42 to 45 KEY4 to 1 I Key input
46 MODE CHK I Destination setting input
47 AGND — Analog ground for A/D converter
48 REMOTE I Sircs receiver data input
49 TC-PLAY I Tape play switch input L: Play
50 WP/INI O Wake-up/Initial setting read signal output
51 3.3V MONITOR I 3.3V MONITOR signal input
52 C-WRQ I CD write request data input
53 C-DOUT I CD digital signal processor data input
54 C-DIN O CD digital signal processor data output
55 C-CLK I CD serial data transfer clock signal input
56 R-COUNT I Tuner PLL IF count input
57 R-DATA O Tuner PLL data output
58 R-CLK O Tuner PLL clock output
59 R-LAT O Tuner PLL latch output
60 B-MUTE O Tuner mute signal output H: Mute
61 C-DRF I CD DRF signal input
62 C-CE O CD chip enable output
63 C-FSEQ I CD frame SYNC input
64 C-XRT O CD system reset output
65 P-CON O System power control output H: PCON
66 ISS1 O ISS1 output
67 ISS2 O ISS2 output
68 DBB O MEGA BASS control output H: MEGA BASS off, L: MEGA BASS on
69 ICO I Connected to VSS.
70 XT1 I Sub system oscillation input (32.768 kHz)
71 XT2 O Sub system oscillation output (32.768 kHz)
72 VDD — Main power supply pin for A/D converter (+3.3 V)
73 VSS — Main ground
74 X1 I Main system oscillation input (4.19 MHz)
75 X2 O Main system oscillation output (4.19 MHz)
76 RST I System reset input
77 V-CLK O Volume clock output
78 V-DATA O Volume data output
79 SCL O EEPROM clock output
80 SDA I/O EEPROM input/output
TEN KEY board
TUNER boar
d
TC board
BATTERY (1) board
BATTERY (2) board
MAIN board
LCD board
FUNCTION KEY board
HEADPHONE board
POWER board
LINE IN board
POWER KEY board
VOL board
CD BUTTON board
CD board

CFD-S250L
1818
A
C
B
F
E
D
A
C
B
D
LD
PD
VR
F
T+
T–
F+
F–
SL+
SL–
SP+
SP–
E
VREF
LD
PD
LD POWER
CONTROLLER
Q701 APC
FIN2
FIN1
LDD
LDS
TIN2
TIN1
VREF
RF
10
9
11
80
7
79
48
9
12
11
TRACKING
COIL
DRIVE
19
7
FOCUS
COIL
DRIVE
TIN
FIN
25
SLIN
SLED
MOTOR
DRIVE
3
SPINDLE
MOTOR
DRIVE
SPIN
VREF
OPIN
MUTE
T+
T–
17
18
F+
F–
26
27
SL+
SL–
2
1
SP+
SP–
TRACKING
COIL
FOCUS
COIL
OPTICAL PICK-UP
BLOCK
(KSS-213R)
M
M
M702
SLED
MOTOR
M701
SPINDLE
MOTOR
SLED/SPINDLE
MOTOR DRIVER,
TRACKING/FOCUS
COIL DRIVER
IC702
S701
(LIMIT)
EFMIN
HFL
AGC
PH(RFENV)
FE
TE
VREF
CONT1 FSEQ CONT4 DRF RES DI CE CL WRQ DO XOUT XIN
LCHO
RCHO
1
3
67
TDDTD
FD
SP
SL
31 72 25 66 63 61 62 49 4865 64
42
45
RF AMP,
SYSTEM SERVO PROCESSOR,
DIGITAL SIGNAL PROCESSOR
IC701
39
29
61 63 54 62 55 52 5364
X701
16.93MHz
C-CE
C-DIN
C-CLK
C-WRQ
C-XRT
C-DRF
C-FSEQ
C-DOUT
CD-DOOR CD
BTT-CHK-H
65
P-CON
28
AC-CHK
SYSTEM CONTROLLER
IC802 (1/2)
CD +3.3V
REG
Q957-959,D957
BATTERY
CHECK
Q804,806
POWER
CONTROLLER
Q819,D802
AUDIO+6V
REG
Q955,D953
+3.3V REG
IC801
POWER
SWITCH
Q952,953
POWER
SWITCH
Q951
CD 3.3V
CD-CONT
S801
PUSH
OPEN/
CLOSE
3.3V
VDD (SW)
AUDIO 6V
D901 – 904
RECT
F902
T901
POWER
TRANSFORMER
J901
AC IN
Signal path
: CD
: CD (DIGITAL)
CLV,CAV
CONTROL
PLL
VCEC
SWITCH
ERROR
CORRECTION
AUDIO CD
A/D
CONVERTER,
SERVO
PROCESSOR
FRAME SYNC
DETECT,PROTECT
INSERT
EFM DECODER
INTERPOLATION
MUTE
&
ATTENUATION
DEEMPHASIS
8FS
DIGITAL
FILTER
&
1-bit DAC
LPF
SLICE
LEVEL
CONTROL
GENERAL
PURPOSE
PORT
COMMAND
INTERFACE
CLOCK
GENERATOR
23
15
FD
SL
SP
TD
VREF
VREF
VREF
CD_IN_R
CD_IN_ L
DRY BATTERY
SIZE " D "
(IEC DESIGNATION R20)
6PCS, 9V
4.5V
4.5V
D/A
CONVERTER
PH/BH
RADIO 6V
CD 6V
40
BTT-CHK-M
41
V-CHECK
20
FDD SPDO SLDO
21 22 23
23
51
3.3V MONITOR
2
D951
Q801
Q815
BATT COM
VDD
AC-HI
U-COM
(VDD)
AUDIO
OUT
DOUT IC705
IC705
39 2 OPTICAL
DIGITAL
OUT(CD)
6-3. BLOCK DIAGRAM — CD SECTION —
(Page 19)
(Page 19)

CFD-S250L
19 19
2
5
21 22 16
4
L-CH
R-CH
HRP301
RECORD/PLAYBACK
HEAD
HE301
ERASE HEAD
DET
Q204
Q112
ALC 2
RADIO L
18
15
L.LO
R.LO
LINE
TAPE
R-CH
TU_IN_R
TU_IN_L
TAPE
LOGIC
5
CLOCK
4
DATA
POWER AMP
IC304
D322
LINE AMP
6V
AUDIO
6V
R-CH
SP201
SPEAKER
(L-CH)
SP101
SPEAKER
(R-CH)
J321
REF
L.LINE
L.RO
REC L.RAD
R.RAD
T301
REC BIAS OSC
Q301
ISS1
66
TAPE
37
V-CLK
V-DATA
CD
CD-CONT
26–106 – 9
LIQUID CRYSTAL
DISPLAY PANEL
LCD401
SYSTEM CONTROLLER
IC802 (2/2)
7736 78
DBB
68
LINE IN
34
COM0
|
COM3
S0
|
S16
EEPROM
IC803
REMOTE
CONTROL
RECEIVER
IC401
SCL SAD
46
MODE CHK
50
WP/INI
Q813 Q812,D807
VOL
48 1
3
KEY1
45
KEY2
44
KEY3
43
KEY4
42
Signal path
: FM
: MW
: TAPE PLAY
: TAPE REC
: CD
R-ch is omitted due to same as
L-ch.
REC/PB
PRE AMP
IC301
11 5
MEGA
BASS
CONTROLLER
Q122
POWER
CONTROL
Q816,817
20
6
14 R.LINE
8R.IN
L.IN
9R.RO
i
A-MUTE
35
MUTE
Q124
LEVEL
DETECT
D323
TC-PLAY
49
M
TAPE PLAY
DETECT
Q808
24
REC
27
-1 -2
S301
(REC/PB)
REC
PB
VDD (SW)
KEY4
KEY3
KEY1
KEY2
S301
(TAPE PLAY)
M301
CAPSTAN/REEL
MOTOR
17
CD_IN_R
CD_IN_L
S417-424
S413-416,425,426,428
S409-411,
S401,402,434-438
65
7980
Q406
3.3V
S439
AUDIO 6V
Q302
AC-HI
REMOTE
TU_IN_R
U-COM
(VDD)
VDD (SW)
1
ISS2
67
Q303
Q814
KEY NETWORK
D405
OPR/BATT
D804
VIN2 VOUT2
IC301
ELECTRONIC VOLUME
8 7
VOL AMP
J303
LINE IN
Q111
Q205
LINE AMP
Q942
5759 58 56 60
R-LAT R-CLK R-DATA R-COUNT
76
RST B-MUTE
74
X1
75
X2
TUNER
X802
4.19MHz
RESET
IC804
70
XT1
71
XT2
X801
32.768kHz
3.3V
1
2
1 2 3 4
11 12 20 19
CE CL
DI
DO
AM IN FM IN XOUT XIN
13
MO/ST
10
IF IN
LPF2/MO-ST
LPF1/BAND
IF-OUT
ST-IND
OSC-OUT
9
BAND
7
BAND
8
ST-IND
18 LP-OUT
6MW/LW
AM
OSC
AM
MIX
FM
MIX
FM
OSC
AM RF-IN
FM
RF-IN
FM
IF-IN
AM
IF-IN
X1
75kHz
FM/MW/LW PLL
IC2
14 17 13 18
16 15 11
12
1920
22 4 6
7
10
2
2124
T1
T2
CF4
L2
L1 CT1
RADIO 6V
RADIO 6V
D1 D2
CT3
CT5
D3
-2
LW
-1
MW
CT3,L3-1
MW
TRACKING
CT5,L3-2
LW
TRACKING
L4
LW FREQUENCY COVERAGE
CT1,L1
FM
TRACKING
L2
FM
FREQUENCY
COVERAGE
T2
FM
IF
T1
MW
IF
ANT1
FM
TELESCOPIC
ANTENNA
IF
BUFFER
AM
DET
FM
DET
IF CUT
AF
BUFFER
FM
MPX MUTE
MW/LW
HIGH
CUT
Q12
IF CUT
R-OUT
L-OUT
RADIO 6V
QUAD
FM/MW/LW FRONT-END, IF AMP,
FM MPX
IC1
L4
RADIO 6V
CF2
RADIO 6V
RADIO 6V
RADIO 6V
MW SW
Q41
L3
MW/LW
FERRITE-ROD
ANTENNA
LW SW
Q43
LW SW
Q44
REG
Q61
MW SW
Q42
MW/LW
SW
Q14
RA6V
AM
OSC
MIX-OUT
FM
RF-OUT FM OSC
DET-OUT MPX-IN
VDD (SW)
D324
6-4. BLOCK DIAGRAM — MAIN SECTION —
(Page 18)
(Page 18)

CFD-S250L
2020
1
A
B
C
D
E
F
G
H
I
2345678910
IC701
Q701
IC702
C729
C730
R730
R728
R729
C704
R708
C728
R724
R722 R725
R726
R707
C701
C726
C723
C725
C724
R719
R717
R716
C720
C721
C722
R731
R721
R720
C716
R715
R714
C727
C711
C709 FB701
C736
C734
R709
C705
R710
R701 C703
C731
R706
R727
R712
R723
C708
R741
JC701
R744
C751
JC702
JC703
C743
C744
C745
C742
C754
C755
C741
C707
L706
C717
C739
C738
R732
R742
R735 R704
R733
R702
R734
R703
R746
R743
R705
R736
R747
R738
R711
R713
C718
C719
R737
R718
M702
M701
S701
C732
CNP701
X701
CNP702
JW706
JW707
JW709
JW713 JW714
JW715
JW716
JW717
JW718
JW721
JW722
JW723
JW724
JW725
JW726
JW727
JW728
JW729
C740
C750
C746
C747
JW719
C735
JW720
C733
C706
JW712
JW710
JW702
JW701
JW708
C702
JW703
JW705
JW704
CNP703
JW711
JW730
JW731
JW732
6-5. PRINTEDWIRING BOARD — CD SECTION — • Refer to page 17 for Circuit Boards Location.
(Page 24)
THIS NOTE IS COMMON FOR PRINTEDWIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
Common Note on Schematic Diagrams:
•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.
•f: internal component.
•C: panel designation.
•A: B+ Line.
•H: adjustment for repair.
•Total current is measured with no cassette installed.
•Power voltage is dc 9V and fed with regulated dc power
supply from battery terminal.
•Voltages aretakenwith a VOM(Input impedance 10MΩ).
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: MW
E: PB
a: REC
J: CD
Common Note on Printed Wiring Boards:
•X: parts extracted from the component side.
•Y: parts extracted from the conductor side.
•f: internal component.
•: Pattern from the side which enables seeing.
Note: The components identified by mark 0or dotted line
with mark 0are critical for safety.
Replace only with part number specified.
(Page 29)