Sony CFD-449 User manual

SERVICE MANUAL
AUDIO
POWER
SPECIFICATIONS
(US
MODEL)
POWER
OUTPUT
AND
TOTAL
HARMONIC
DISTORTION
SPECIFICATIONS
CFD-449
US Model
Canadian Model
| isle
DIGITAL AUDIO
MEGA BASS
CFD-440
NEW
KSM-2101 BAN
MF-445-102
Model Name Using | CD Section
Similar Mechanism Tape Section
Optical Device Name
Tape Transport Mechanism Type
With
3.2-ohm
loads,
both
channels
driven
from
150-15,000
Hz;
rated
2
W
per
channel-minimum
RMS
power,
with
no
more
than
10
%
total
harmonic
distortion
in
AC
operation.
Other Specifications
CD player section
System
Laser diode properties
Spindie speed
Error correction
Number of channels
Frequency response
Wow and flutter
Radio section
Frequency range
Antennas
Compact disc digital audio system
Material: GaAlAs
Wave length: 780 nm
Emission duration: Continuous
Laser output: Less than 44.6 uW
(This output is the value measured at a distance
of adout 200 mm trom the oodjective lens
surface on the optical pick-up block.)
200 r/min (rpm) to $00 r/min (rpm)
(CLV)
Sony Refined Super Strategy
Cross interleave Reed Solomon Code
2
20--20,000 Hz = 1 dB
Below measurable limit
FM: 87.6-108 MHz
AM:530—1,710 kHz
FM: Telescopic antenna
AM: Built-in ferrite bar antenna
Cassette-corder section
Recording system
Frequency response
4-track 2-channel stereo
TYPE I (normal) cassette:
80-10,000 Hz
General
Speaker Woofer: 10 cm dia., 3.2 ohms
cone type
Tweeter: 2cm
Inputs Mixing microphone input jack
(minijack):
Sensitivity 2.5 mV
For low impedance microphone
Outputs Headphones jack (stereo minijack)
For 16-68 ohms impedance
headphones
Power outout 2.3W+2.3W
(except US model) (at 3.2 ohms, 10% harmonic in DC
operation)
Power requirements 120 V AC, 60 Hz
DC 9 V, 6 size D (R20) batteries
Power consumption AC 17W
Battery life For CD radio cassette-corder:
. FM recording Tape playback CD playback
Sony SUM-1 (NS) approx. 11h approx. 8h aoorox. 5h
Sony Alkaline AM1 approx. 17h avorox. 12h aporox. 7h
Dimensions Approx. 588 x 231 x 207 mm (wit/d)
(23% x 9'4 x 874 in.) inci. projecting parts
Mass 7.2 kg (15 Ib 14 02) (incl. batteries)
Supplied accessories AC power cord (1)
Design and specifications subject to change without notice.
CD RADIO CASSETTE-CORDER
SONY.

SAFETY
CHECK-OUT
(US
MODEL)
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 0.5mA (500 microampers). Leakage
current can be measured by any one of three
methods.
1. A commercial leakage tester, such as the
Simpson 229 or RCA WT-S540A. Follow the
manufacturers’ instructions to use these instru-
ments.
tw
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 volt-
The “limit” indication is 0.75 V, so
low-
meter.
analog meters must have an accurate
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are
suitable. (See Fig. A)
To Exposed Metal
Parts on Set
AC
voltmeter
(0.75 V)
= Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK A\ 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.
TABLE OF CONTENTS
Section Title Page
1. SERVICING NOTES ...........................005. 3
2. DISASSEMBLY
2-1. Front Cabinet Section .......... 0.0.0 c cee eee eee 4
2-2. Pointer Setting ............ eens 4
3. MECHANICAL ADJUSTMENTS.................... 5
4. ELECTRICAL ADJUSTMENTS
4-1. Tape Recorder Section ............. 00. cece eee eee 5
4-2. Tuner Section....... 000.0000. c ccc eee eee eee ees 6
4-3, CD Section ......... 0.0. cece cece cee eee eee 8
5. DIAGRAMS
d-l. Circuit Boards Location .....................0.. 12
5-2. Block Diagram......... 2... cece cece eens 13
5-3. Semiconductor Lead Layouts ...............0005. 15
5-4. Printed Wiring Boards—Tuner/Audio/
Mechanism Deck/Power Section— .............. 16
5-5. Schematic Diagram—Tuner Section— ............ 19
5-6. Schematic Diagram—Audio/Mechanism Deéck/
‘Power Section— ....... 0.0.6 ccc cece cece eens 21
0-7. Schematic Diagram—CD Section— .............. 25
5-8. Printed Wiring Boards—CD Section— ............ 29
6. EXPLODED VIEWS
6-1. Cabinet Section ......... 0... cece eee 33
6-2. Front Cabinet Section ............. 0... cece eee ee 34
6-3. Mechanism Deck Section (1) ................00.. 35
6-4. Mechanism Deck Section (2) ................205. 36
6-5. CD Block Section ......... 0... eee eee 37
6-6. Optical Pick-up Section «1.2.0.2... 00. c eee eee ee eee 38
6-7. Speaker Section ......... 0... cece cece eee ene 39
7. ELECTRICAL PARTS LIST ...................... 40
ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!
LES COMPOSANTS IDENTIFIES PAR UNE MARQUE /\
SUR LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS CE MANUEL OU
DANS LES SUPPLEMENTS PUBLIES PAR SONY.

SECTION 1
SERVICING NOTES
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 more than 25cm away from the
objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
1. Turn POWER switch on with no disc inserted and make
Function switch to CD position.
Open the lid for CD.
Turn on $704 as following figure.
Press > key.
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.
SM eS
Objective lens moves up and down three times 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
———~
Ges)
S

SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1.
FRONT
CABINET
SECTION
@
BVTP3x12
@ BTP3xX10
® Connector
BVTP3 X20
@ Front cabinet assy
BVTP3X12
2-2. POINTER SETTING
@ AUDIO MAIN board
@ Set the pointer
to the center of
scracthed lines.
@
Turn
TUNING
CAPACITOR
GEAR
counterclockwise
to
the
end.
claw

SECTION 3.
MECHANICAL ADJUSTMENTS
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
demagnetizer. (Do not bring the head demagnetizer close
to the erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4, After the adjustments, apply suitable locking compound
to the parts adjusted.
5. The adjustments should be performed with the rated
power supply voltage unless otherwise noted.
6. Power supply voltage: 9V dc.
Torque Measurement
20—60g*°cm
ae (0.28—0.83 oz*inch)
cain
inate an Sch
Tape Tension Measurement
Meter Reading
more than 70g
(more than 2.47 oz)
Meter reading
Torque meter
Mode Tension meter
Forward CQ-403A
CQ:408R
SECTION 4
ELECTRICAL ADJUSTMENTS
4-1. TAPE RECORDER SECTION
Standard Output Level
Output terminal SP OUT HP OUT
O75 046) _| 025 (—108)
Test Tape
Type Signal
Tape Speed Adjustment
Setting :
FUNCTION switch: TAPE
Procedure :
speed checker
Mode: playback aise
digital frequency
test tape counter
WS-48A
(3kHz, OdB)
eo)
320
HEE
- +
Phones jack
Adjustment Value:
Speed checker Digital frequency counter
—3% to +3% 2,910 to 3,090Hz
Frequency difference between the beginning and the end of
the tape should be within +1.5% (45Hz).
Adjustment Location :
adjustment resistor (RV401)
(included motor assy (M601))
ay

4-2. TUNER SECTION
@ FM Section
Setting :
FUNCTION switch: RADIO
BAND switch : FM
FM rf signal
generator
telescopic antenna
input
O.0LuF
22.5kHz frequency
deviation by 400Hz signal
output level: as low as possible
@ AM Section
Setting :
FUNCTION switch: RADIO
BAND switch >: AM
AM rf signal
generator
Put the lead-wire
antenna close to
aa the set.
(GEaaEee
30% amplitude
modulation by
400Hz signal
VTVM
(range: 0.5—-5V ac)
Phones jack
@ Repeat the procedures in each adjustment several times,
and the frequency coverage and tracking adjustments
should be finally done by the trimmer capacitors.
@ Remove telescopic antenna in FM section adjustments.
FM FREQUENCY COVERAGE
ADJUSTMENT
Adjust for a maximum reading on VT VM.
L2 CT1-2
86.5MHz 109.5MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on VIVM.
Ll
86.5MHz 109.5MHz
AM FREQUENCY COVERAGE
ADJUSTMENT
Adjust for a maximum reading on VT VM.
520kHz 1,780kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on VT VM.
L3 CT1-3
620kHz 1,400kHz
AM IF ADJUSTMENT
Adjust for a maximum reading on VT VM.
455kHz
Adjustment Location : main board

FM VCO ADJUSTMENT MAIN BOARD—Conductor side—
Setting :
FM RF SSG
0.001 nF
C——} ——-_ICi pin
Modulation: no modulation
Output level: 0.1V (100dB)
L3
AM
FERRITE-ROD
ANTENN
we
Carrier Frequency: According to the color of the mark on
ceramic (CF2).
10.67 MHz
10.73 MHz
10.64 MHz
10.76 MHz
Procedure :
1. Adjust RV1 so that the reading on the frequency counter
becomes in 76.0kHz +0.3kHz.
Adjustment Location : main board (FM VCO)
33kQ frequency counter
wetsov |__|
MAIN BOARD—Component side—
TELESCOPIC ANTENNA
INPUT
FM
FREQUENCY L2
COVERAGE CT1-2 AM
Ale be TRACKING
CT1-3 ies
FM L1
TRACK ING
ADJ ree
AM
FREQUENCY CT1-4
COVERAGE TI
ADJ

4-3. CD SECTION
Notes on Adjustment
1. Perform adjustment in test mode. _
After adjustment, be sure to release test mode.
2. Perform adjustments in the order given.
3. Use the disc (YEDS-18, Part No. 3-702-101-01) only when
so indicated.
Before Adjustment
Put the set into test mode and perform the following
checks. Repair if there are any problems.
e Sled Motor Check
1. Press > button, then press Hi button.
2. Press PPI, 44 buttons and confirm that the FOP moves
smoothly from the innermost to outermost circumference
and back smoothly and with no catching or abnormal
noises.
>i: FOP moves to the outer circumference
Kd: FOP moves to the inner circumference
e Focus Search Check
1. Press > button. (Focus search operation is performed
continuously.)
2. Look at the FOP objective lens and confirm the it moves
up and down smoothly, with no catching or abnormal
noises.
3. Press if button.
Confirm that focus search operation stops. If it does not,
press I button again longer.
How to Put the Set into Test Mode
1. Short the following portion on the CD CONTROL board.
2. Turn the FUNCTION selector to CD position.
{CD CONTROL BOARD]
04
Traverse Adjustment
This adjustment is to be done when the optical pick-up block
is replaced.
Procedure:
oscilloscope
(DC range)
T(E) OO
CD main board es (VREF) | es
1. Put the set into test mode.
2. Connect the oscilloscope between TP (TE) and TP
(VREF).
3. Press the »Pl and K€ buttons to move the FOP to the
center.
4. Insert disc (YEDS-18) and press > button.
Adjust RV701 so that the oscilloscope traverse waveform
is symmetrical, as shown in the figure below.
6. Release test mode after adjustment is completed.
VOLT/DIV: 1V
TIME/DIV: 1mS
Adjustment value: 1.7+0.8Vp-p (A+B)
Adjustment Location : CD main board (See page 11.)
Short the jumper wire.

Focus Bias Adjustment
This adjustment is to be done when the optical pick-up block
is replaced.
Procedure:
oscilloscope
(DC range)
TP (RFO)
TP (VREF)
CD main board {
1. Put the set into test mode.
Connect the oscilloscope between TP (RFO) and TP
(VREP).
3. Press the >I and M4 buttons to move the FOP to the
center. (Move the FOP to the music area on the disc to
enable easy visibility of the eye pattern.)
Insert disc (YEDS-18) and press > button.
5. Adjust RV702 so that the oscilloscope waveform is as
shown in the figure below (eye pattern).
A good eye pattern means that the diamond scape (©) in
the center of the waveform can be clearly distinguished.
6. Release test mode after adjustment is completed.
e@ RF signal reference waveform (eye pattern)
\
TYTN
TTY
0000000000
Vn
1.27
54Vee
\ WAN
My ny
VOLT/DIV: 0.2V
TIME/DIV: 500mS
9,
\XY)
Nt eaa
VDODADBOHABABHOO
OV
When observing the eye pattern, set the oscilloscope for AC
range and raise vertical sensitivity.
Adjustment Location : CD main board (See page 11.)
Focus/Tracking 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 adjust-
ment.
Focus/tracking gain determines the pick-up follow-up (ver-
tical and horizontal) relative to mechanical noise and me-
chanical shock when the 2-axis device operate.
However, as these reciprocate, the adjustment is at the
point where both are satisfied.
e When gain is raised, the noise when the 2-axis device
operates increases.
e When gain is lowered, it is more susceptible to mechanical
shock and skipping occurs more easily.
e@ When gain adjustment is off, the symptoms below appear.
os [ee
eThe time until music starts
becomes longer for HM -%PD on
automatic selection. low low or high
(Kd , PP! buttons pressed.) (Nor-
mally takes about 2 seconds.)
eMusic docs not start and disc
continues to rotate for H +> or iow
automatic selection.
(Kd, PPI buttons pressed.)
eSound is interrupted during
PLAY. Or time counter display low
e More poise during 2-axis device hish hich
operation. . 7
stops progressing.

The following is a simple adjustment method.
—Simple Adjustment—
Note : Since exact adjustmeunt cannot be performed,
remember the positions of the controls before perfor-
ming the adjustment. If the positions after the simple
adjustment are only a little different, return the con-
trols to the original position.
oscilloscope
(DC range)
CD main board
oon O
|
Procedure :
{
TP (TE) Om- -7
TP (VREF)
1. Keep the set horizontal.
If the set not horizontal, this adjustment cannot be
performed due to the gravity against the 2 axis device.
Put the set into test mode.
Connect oscilloscope to CD main board TP (FE).
Insert disc (YEDS-18) and press > button.
Adjustment RV703 so that the waveform is as shown in
the figure below. (focus gain adjustment)
Sa Cont
VOLT/DIV: 100mV
TIME/DIV: 2mS
100mV
Ky AY" oe
OV
e Incorrent Examples (DC level changes more than on adjust-
ed waveform)
low focus gain
TIME/DIV: 2mS
250mV
high focus gain
TIME/DIV: 2mS
100mv
75mvV
OV
VOLT/DIV: 100mvV
VOLT/DIV: 100mv
6. Connect oscilloscope to TP (TE).
7. Adjust RV704 so that the waveform is as shown in the
figure below. (tracking gain adjustment)
8. Release test mode after adjustment is completed.
VOLT/DIV: 1V
TIME/DIV: 2mS
OV
® Incorrect Examples (fundamental wave appears)
low tracking gain
VOLT/DIV: 1V
TIME/DIV: 2mS
OV
high tracking gain .
(higher fundamental wave than for low gain)
VOLT/DIV: 1V
TIME/DIV: 2mS