Sony CFD-50 User manual

US Model
Canadian Model
SPECIFICATIONS
AUDIO POWER SPECIFICATIONS (US model)
Full-range speakers:
With 3.2-ohm loads, both channels driven from
150-15,000 Hz: rated 2.3 W per channel mini-
mum RMS power, with no more than 10% total
harmonic distortion in AC operation.
OTHER SPECIFICATIONS
CD player section
System
Laser diode properties
Compact disc digital audio system
Material: GaAlAs
Wavelength 780 nm
Emission duration: Continuous
Laser output: less than 44.6 p.W
* This output is the value measured at a dis-
tance of about 200 mm from the objective
lens surface on the optical pick-up block.
20-—20,000 Hz +? dB
Below measurable limit
Frequency response
Wow and flutter
Tuner section
Frequency range FM: 87.6—108 MHz
AM: 530—1,710 kHz
Tape recorder section and general
Recording system 4-track 2-channel stereo
Frequency response 70 — 10,000 Hz
(with TYPE | (NORMAL) cassette)
Full-range speakers: 10 cm dia., cone type
Full-range speakers: 2.3W+2.3W (at 3.2 ohms,
315 Hz, 10% harmonic distortion)
Speaker
Power output
(Canadian mode!)
CD Section
Tape Section
Model Name Using
Similar Mechanism
Optical Device Name
MF-50RP-75D
Tape Transport Mechanism Type
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
120 V AC, 60 Hz
DC 9 V, 6 size D (R20) batteries
AC 25 W
Power requirements
Power consumption
Battery life Batteries for radio cassette-corder (hours)
[_SS*d;CF
Recording
[Playback
Sony SUM-1 (NS)
Sony Alkaline AM1 (N)
approx. 8
approx. 12
approx. 17
Dimensions 590 X 172 X 200 mm (w/h/d)
(23/4 X 67/, X 7/3 inches)
incl. projecting parts and controls
Weight Approx. 4.6 kg, incl. batteries
(Approx. 10 Ib 2 oz)
Supplied accessories AC power cord (1)
Design and specifications subject to change without notice.
CD RADI

CFD-50
SAFETY CHECK-OUT
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-540A. Follow the
manufacturers’ instructions to use these instru-
ments.
2. 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-
meter. The “limit” indication is 0.75 V, so
analog meters must have an accurate low-
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
Using an AC voltmeter to check AC leakage.
TABLE OF CONTENTS
Section
Title
Page
Specifications
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Safety
Check-out
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1.
SERVICING
NOTES
Notes on Handling the Optical Pickup
Block or Base Unit a 3
Notes on Laser Diode Emission Check -----+- 3
Chuck Plate Jig on Repairing --+++++++++eee- a
Laser Diode and Focus Search
Operation Check a 3
2.
GENERAL.
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cbse
smesysee
dunes
4
3.
DISASSEMBLY
..----.-----eecceeecceees
4
4. MECHANICAL ADJUSTMENTS
Tape Recorder Section -++++eeeeeeeeeeeeeee 6
5. ELECTRICAL ADJUSTMENTS
5-1. Tape Recorder Section --+++++err essere sees 7
5-2. Tuner Section Ostia pa, Bie: ele cone! Bete. e-e 8 eee ow wie eos Ss 8
5-3.
CD
Section
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9
6. DIAGRAMS
6-1.
CD
Section
Block
Diagram
-+++++++++++-+-+--
13
6-2.
Tuner,
Audio
Section
Block
Diagram
-+---++:-
1S
6-3.
Printed
Wiring
Boards
---+++-++++eee
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17
6-4. Tuner, Audio Section Schematic Diagram 2)
6-S.
CD
Section
Schematic
Diagram
-++++++++++-
25
7.
EXPLODED
VIEWS
.«.---------eseeeeeee
29
8. ELECTRICAL PARTS LIST .----------- 35
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.
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
CFD-50
SERVICING NOTES
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 poten-
tial 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. There-
fore, when checking the laser diode emission, observe
more than 25 cm away from the objective lens.
Insert screwdriver and push S801.
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
LASER DIODE AND FOCUS SEARCH
OPERATION CHECK
1,
Der eae t Ae | ae
ai
Make Function switch to CD position with no disc
inserted.
Open the lid for CD.
Turn on S801 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.
Objective lens moves up and down once for the focus
serarch.
Yf.
~~
| AS S801
AL 27.
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yvilty,
pe a
laser diode

CFD-50
SECTION 2
GENERAL
e Parts Identification
Radio, Tape Section . CD Player Section
MIX MIC jack
OPRI/BATT indicator
Telescopic antenna
FUNCTION selector
Display window
PLAY MODE button
Disc holder
TONE control OPEN button
VOLUME cont
PHONES jack CD operation buttons
Cassette holder
Tape operation
buttons
-
ae
REMAIN/ENTER
button
indicator
SECTION 3
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
DIAL POINTER SETTING
@ Set the center of the dial pointer
to the center of three points
on the sub chassis.
@ til gs pointer to the dial pointer
sub chassis
dial pointer
© Turn PVC gear fully
counter-clockwise with
the tuning knob.
tuner board
@ Insert the tuning knob
@ Turn the tuning knob in the order of frequency
MAX ~-> MIN and confirm the dial pointer
is not out of order.
s @ +BVIP3 X 12

CFD-50
FRONT CABINET
@
Open
cassette
holder.
@
CNJ302
@ front cabinet
© BVTP3 x 40
© BVTP3 x 40 j @ battery case lid
@
+BVTP3
X
12
TUNER
BOARD
@ +BVTP3 x 12
@ tuner board es,
MD SECTION
© CNJ21
@ CNJ306
CD MAIN BOARD
AUDIO BOARD
OSB Trs rik © CD main board
@ Remove two volume knobs. @ Slide out CD section
(VOLUME, TONE)
© +BVTP3 X 129
i
§ © +BVTP3 X 12
® audio board
POWER BOARD
@ +BVTP3 X 12
@ power board

CFD-50
SECTION 4
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 demagentizer.
(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 voltge: 9V dc.
Torque Measurement
22.5 — 55 gecm
Fast Forward and 60 — 120 g*cm
(0.83 1.67 ozrinchy | COMI
: 2 — Sgecm
(0.03 = 0.07 ozrinchy | | SO
Tape Tension Measurement
CQ-403A more than 150 g (5.29 02)
SECTION 5
ELECTRICAL ADJUSTMENTS
PRECAUTION
Adjustments should be performed in the order given.
Generally playback circuit adjustments should be completed before
performing recording circuit adjustments.
Adjustments should be performed for both L-ch and R-ch.
Switches and controls should be set as follows unless otherwise
specified.
Positions of switches and control knobs
TONE BO OOO ROHS ie: CLO OO 6 06 0168. O08 6.656 SOE 8) OS 8 ON Oe 0180 O88 are) maximum
Standard recording position
Adjust the VOLUME knob so that the following regulated
input/output signal levels are obtained.
Standard input level
[—__tput ind
Standard output level
[Output Pin [Speaker A)] PHONES
Output
signal
level
“0
cB
)
Wee
ie
0
dB=0.775
V

5-1. TAPE RECORDER SECTION
@ Test Tape
| Type | Signal =| Used for
WS-48A 3 kHz, 0 dB tape speed adjustment
P-4-A063 6.3kHz, — 10 dB | head azimuth adjustment
REC/PB Head Azimuth Adjustment
Procedure:
1. Mode: playback
test tape
P-4-A063
(6.3kHz,
— 10dB)
PHONES jack
2. Turn the adjustment screw for the maximum output levels. If these
levels do not match, turn the adjustment screw until both of output
levels match together within 3 dB.
L-CH | ~
peak within
Output Zan i within
level 3d8
! }
!
I
|
R-CH
screw peak aie
osition
positi L-CH R-CH —* angle
peak peak
3. Phase Check
Mode: playback
test tape
P.4-A063
oscilloscope
(6.3kHiz, :
— 10d8)
320
PHONES jack ®C4
Screen pattern
O@®
QO
135° 180°
es
wrong
in phase 45° 90°
oceennmennteenmmeenen ammamenmemeeemenamnenendtl
good
Adjustment Location:
adjustment screw
| CFD-50
Tape Speed Adjustment
Procedure:
Mode: playback
speed checker
LFM-30
or
digital frequency
test tape counter
WS-48A
(3kHz, OdB)
PHONES jack
Adjustment Value:
Speed checker Digital frequency counter
— 2.5 to +1.0% 2,925 — 3,030 Hz
Frequency difference between the beginning and the end of the tape
should be within 1% (30 Hz).
Adjustment Location:
O
adjustment resistor

CFD-50 |
5-2. TUNER SECTION
[AM]
FUNCTION switch: AM
AM RF SSG
Put the lead-wire
antenna close to
we the set.
(QE aE
30% amplitude modulation
by 400 Hz signal
output level: as low as possible
[FM]
FUNCTION switch: FM
FM RF SSG
22.5 kHz frequency deviation
‘by 400 Hz signal
output level: as low as possible
to FM ANT IN
PHONES
@ Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally done
by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on VITVM.
455 kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on VT VM.
520 kHz
1,780 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on VTVM.
600 kHz
1,500 kHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on VTVM.
. 86.5 MHz
109.5 MHz
FM VCO Adjustment
A) Regular Method
Procedure:
FM ff signal
generator
= po
Carrier frequency : 98MHz telescopic
Modulation: no modulation antenna lead
Output level: 0.1V (100dB)
Remove jumper wire as shown below.
Connect frequency counter to the positions shown below.
Tune the set to 98 MHz.
Adjust RV1 for 76 kHz + 500 Hz reading on the frequency counter.
After adjustment, connect jumper wire removed in step 1.
Remove jumper wire
Aaa Noe
frequency counter
nee) Bere
B) Simple Method
Procedure:
1. Tune the set to the FM stereo broadcasting signal.
2. Turn RV1 clockwise or counterclockwise and memorize the lighting-
up range of the FM STEREO lamp.
3. Secure RVI at the center of the lighting-up range of both turns as
shown below.
center of lighting-up ranges
lighting-up range
iO)
/
, N
N
ee
Sao
RVI
FM FREQUENCY
EMVvco COVERAGE
RV1 L2 cCT2
AM
TRACKING
11 CTi Li CT4 L4
AMIE CEM FREQUENCY
—38— TRACKING GovERAGE

5-3. CD SECTION
How to Put the Set into Service Mode
Notes on Adjustment
1. Perform adjustment in service mode.
After adjustment, be sure to release service mode.
2. Perform adjustments in the order given.
3. Use the disc (YEDS-18, Part No. 3-702-101-01) only when so
indicated.
1. Short-circuit following portions on the CD main board.
2. Tune the POWER on.
CD main board (conductor side)
: short-circuit
Before Adjustment
Put the set into service mode and perform the following checks. Repair if
there are any problems.
Le eS [ee |
e Sled Motor Check
1. Press ® key, then press I key.
Press PPI, Kd keys and confirm that the FOP moves smoothly
from the innermost to outermost circumference and back smoothly
and with no catching or abnormal noises.
pb] : FOP moves to the outer circumference
K4q : FOP moves to the inner circumference
@ Focus Search Check
Press > key. (Focus search operation is performed continuously.)
Look at the FOP objective lens and confirm that it moves up and
down smoothly, with no catching or abnormal noises.
3. Press Ml key.
Confirm that focus search operation stops. If it does not, press Il key
again longer.
N=
VCO Adjustment
Adjustment Procedure:
1.. Short-circuit @ portion CD main board.
2. Adjust with RV703 so that the reading on frequency counter
becomes 4.3218 MHz.
3. Release the short-circuit @ portion.
Adjustment Location: CD main board (conductor side)
frequency counter

E-F Balance Adjustment
This adjustment is to be done when the optical block is replaced.
Adjustment Procedure: :
Connect the oscilloscope between IC701 pins @ and @.
Put the set into service mode. (See page 9)
Press the PP] and k4q keys to move the FOP to the center.
Insert disc (YEDS-18) and press } key.
Adjust RV701 so that the oscilloscope traverse waveform is
symmetrical, as shown in the figure below.
Release service mode after adjustment is completed.
A
8
VOLT/DIV: 1V
TIME/OIV: Ims
Adjustment Location: CD main board (conductor side)
RV702 RV701
Focus Bias Adjustment
This adjustment is to be done when the optical block is replaced.
Adjustment Procedure:
Connect the oscilloscope between IC701 pins @ and @.
Put the set into service mode. (See page 9) __
Press the PP] and K¢q keys 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 > key.
Adjust RV702 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.
Release service mode after adjustment is completed.
RF signal reference waveform (eye pattern)
\RXANA i
Wie i
\\
VOLT/OIV : 0.2V
TIME/OIV : 500ns
0.8 — 1.5 Vp-p
Hii
MA
Way
Wy
ov
When observing the eye patern, set the oscilloscope for AC
range and raise vertical sensitivity.
E-F Balance Adjustment
oscilloscope
(DC range)
ES Focus Bias Adjustment
+
oscilloscope
(DC range)