Sony CFDS-38 Service manual

CFD-S38
SERVICE MANUAL
Ver 1.2 1999. 09 With SUPPLEMENT-1 (9-926-939-81)
CD
Section
TC
Section
US Model
Canadian Model
E Model
Model Name Using Similar Mechanism NEW CD Mechanism Type KSM-213CDM Optical Pick-up Name KSS-213C Model Name Using Similar Mechanism CFD-V10 T ape Transport Mechanism Type MF-V10-117
AUDIO POWER SPECIFICATIONS (US Model)
POWER OUTPUT AND T OTAL HARMONIC DISTORTION With 6-ohm loads, both channels driven from 100 - 10,000 Hz; rated 4 W per channel­minimum RMS power, with no more than 10% total harmonic distortion in AC operation.
Other Specifications 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
SPECIFICATIONS
Radio section
Frequency range
FM: 87.6 - 108 MHz AM: 530 - 1,710 kHz
Aerials
FM: Telescopic aerial AM: Built-in ferrite bar aerial
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): 70 - 13,000 Hz
General
Speaker
Full range: 10 cm (4 in.) dia., 6 ohms, cone type (2)
Outputs
Headphones jack (stereo minijack) For 16 - 68 ohms impedance headphones
– Continued on next page –
MICROFILM
CD RADIO CASSETTE-CORDER
– 1 –
Power requirements
For CD radio cassette-corder: 120 V AC, 60 Hz 9 V DC, 6 size D (R20) batteries For memory back-up: 6 V DC, 4 size AA (R6) batteries For remote control: 3 V DC, 2 size AA (R6) batteries
Power consumption
AC 25 W
Battery life
For CD radio cassette-corder:
FM recording
Sony R20P: approx. 3.5 h Sony alkaline LR20: approx. 10 h
Tape playback
Sony R20P: approx. 1.5 h Sony alkaline LR20: approx. 5 h
CD playback
Sony R20P: approx. 1 h Sony alkaline LR20: approx. 4 h
Dimensions
Approx. 420 × 156 × 262 mm (w/h/d)
5/8 × 6 1/4 × 10 3/8 inches) (incl. projecting parts)
(16
Mass
Approx. 4.7 kg (10 lb. 6 oz.) (incl. batteries)
Supplied accessories
AC power cord (1) Remote control RMT-CS38A (1) (Except Singapore model) Remote control RMT-CS38AD (1) (Singapore model)
Design and specifications are subject to change without notice.
CAUTION
Use of controls or adjustments or performance of proce­dures other than those specified herein may result in haz­ardous 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 pick­up block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY P ARTS WHOSE P ART NUMBERS APPEAR AS SHOWN IN THIS MANU AL OR IN SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE ! SUR LES DIAGRAMMES SCHÉMA TIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
À LA SÉCURITÉ!!
– 2 –
SAFETY CHECK-OUT
TABLE OF CONTENTS
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 A C 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 0.5 mA (500 microamperes). 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 instruments.
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 V OM or battery-operated A C v oltmeter. The “limit” indication is 0.75 V, so analog meters must have an accurate lo w-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)
1. SERVICING NOTES......................................................... 4
2. GENERAL
Playing a CD ........................................................................... 5
Listening to the radio............................................................... 5
Playing a tape .......................................................................... 6
Recording on a tape ................................................................. 6
3. DISASSEMBLY
3-1. Lid, Battery Case................................................................. 7
3-2. Cabinet Assy, Front ............................................................. 7
3-3. Wires ................................................................................... 8
3-4. Transformer, Power ............................................................. 8
3-5. Antenna, Telescopic ............................................................ 9
3-6. Tuner Board.........................................................................9
3-7. Cabinet (Upper) Assy........................................................ 10
3-8. Main Board ....................................................................... 10
3-9. CD Mechanism Block ....................................................... 11
3-10. Tape Mechanism Block ..................................................... 11
4. MECHANICAL ADJUSTMENTS............................... 12
5. ELECTRICAL ADJUSTMENTS
Tape Section .......................................................................... 12
Tuner Section.........................................................................13
CD Section ............................................................................ 14
To Exposed Metal Parts on Set
0.15µF
1.5k
Earth Ground
AC voltmeter (0.75V)
Fig. A. Using an AC voltmeter to check AC leakage.
6. DIAGRAMS
6-1. IC Pin Description............................................................. 15
6-2. Circuit Boards Location .................................................... 16
6-3. Block Diagram – CD Section –......................................... 17
6-4. Block Diagram – Main Section –...................................... 19
6-5. Schematic Diagram – Tuner Section –.............................. 21
6-6. Printed Wiring Board – Tuner Section – ........................... 23
6-7. Printed Wiring Board – Control Section – ........................ 24
6-8. Printed Wiring Boards – Main Section – .......................... 25
6-9. Schematic Diagram – Main Section (1/3) – ...................... 27
6-10. Schematic Diagram – Main Section (2/3) – ...................... 29
6-11. Schematic Diagram – Main Section (3/3) – ...................... 31
6-12. Printed Wiring Boards – Power Supply Section – ............ 33
6-13. Schematic Diagram – Power Supply Section –................. 35
7. EXPLODED VIEWS
7-1. Front Cabinet Section........................................................ 40
7-2. Cabinet (Rear) Section ...................................................... 41
7-3. Cabinet (Upper) Section.................................................... 42
7-4. Tape Mechanism Section-1 ............................................... 43
7-5. Tape Mechanism Section-2 ............................................... 44
7-6. Optical Pick-up Section .................................................... 45
8. ELECTRICAL PARTS LIST......................................... 46
– 3 –
SECTION 1

SERVICING NOTES

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
LASER DIODE AND FOCUS SEARCH OPERATION CHECK
1. Turn ON the POWER button and press FUNCTION button to CD position.
2. Open the lid (CD).
3. Turn on S501 with screwdriver, etc. as following figure.
4. Press the CD button.
5. Confirm the laser diode emission while observing the objecting lens. When there is no emission, Auto P o wer Control circuit or Optical Pick-up is broken. Objective lens moves up and down three times for focus search.
S501
– 4 –
SECTION 2

GENERAL

This section is extracted from instruction manual.
– 5 –
– 6 –
SECTION 3
2

DISASSEMBLY

• The equipment can be removed using the following procedure.
Set
Lid, battery case
Cabinet assy, front
Wires Transformer,
power
Antenna, telescopic
Cabinet (upper) assy
Note : Follow the disassembly procedure in the numerical order given.
3-1. LID, BATTERY CASE
2
screws +BVTP 3x10
3
screws +BVTP 3x10
Tuner board
1
lid, battery case
Main board
4
screws +BVTP 3x1
CD mechanism block
Tape mechanism block
3-2. CABINET ASSY, FRONT
3
cabinet assy, front
1
CNP307
– 7 –
2
CNP502
3-3. WIRES
)
T
Put flat cable and wires between the cabinets and push them in the grooves located at A to F in the figure to prevent disconnection before assembling the set.
FRONT CABINE
3-4. TRANSFORMER, POWER
A
D
B
C
CABINET (REAR
E
F
2
screws +BVTP 3x10
1
screws +BVTP 3x10
3
screws +BVTP 3x10
6
CNP901
4
transformer, power
5
CNP902
– 8 –
3-5. ANTENNA, TELESCOPIC
2
antenna, telescopic
1
screw +B 3x8
3-6. TUNER BOARD
2
5
tuner retainer board
4
tuner retainer board
3
screw +BVTP 3x10
KH2
1
KH1
6
TUNER board
– 9 –
3-7. CABINET (UPPER) ASSY
0
6
screw +BVTP 3x10
9
screws +BVTP 3x10
5
holder assy, cassette
0
screws +BVTP 3x10
7
lid (CD)
8
screw +BVTP 3x10
cabinet (upper) assy
!™
handle
3-8. MAIN BOARD
1
3
CNP901
2
screws +BVTP 3x10
screws +BVTP 3x10
6
connector
4
connector
4
CNP902
1
KH1
2
KH2
7
CNP301
3
screws +BVTP 3x1
0
MAIN board
9
CNP305
8
CNP304
5
wire (flat type) (16 core)
– 10 –
3-9. CD MECHANISM BLOCK
0
1
screws (2.6x10)
2
screws (2.6x10)
3
CD mechanism block
3-10. TAPE MECHANISM BLOCK
1
screws +BVTP 3x10
3
tape mechanism block
2
screw +BVTP 3x1
– 11 –
)
SECTION 4

MECHANICAL ADJUSTMENTS

SECTION 5

ELECTRICAL 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 magnetizer 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.
Torque Measurement
Mode Torque meter Meter reading
FWD CQ-102C
FWD Back Tension (0.021 – 0.076 oz • inch)
FF CQ-201B
REW CQ-201B
CQ-102C
30 – 70 g • cm
(0.42 – 0.97 oz • inch)
1.5 – 5.5 g • cm
more than 60 g • cm
(more than 0.83 oz • inch)
more than 60 g • cm
(more than 0.83 oz • inch)
TAPE SECTION 0 dB = 0.775 V
• Standard Output Level Output terminal HP OUT
load impedance 32
output signal level 0.25 V (–10 dB)
• Test Tape
Type Signal Used for
WS-48A 3 kHz, 0 dB tape speed adjustment
T ape Speed Adjustment
Procedure:
Mode: playback
test tape WS-48A (3 kHz, 0 dB)
set
2
jack (J301
digital frequency counter
32
T ape Tension Measurement
Mode Tension meter Meter Reading
FWD CQ-403A
more than 100 g
(more than 3.53 oz)
Adjust so that the value on the digital frequency counter is 3,000 Hz.
Specification Value:
Digital frequency counter
2,910 to 3,090 Hz
Adjust so that the frequency at the beginning and that at the end of tape winding are between 2,910 to 3,090 Hz.
Adjustment Location:
Tape speed adjustment control inside motor
– 12 –
)
TUNER SECTION 0 dB = 1 µV
3.0 ± 1.0 mm
L3 AM FERRITE-ROD ANTENNA
• FM Section
Setting:
RADIO (BAND) button: FM
FM RF signal generator
TP (FM ANT)
µ
F
0.01
75 kHz frequency deviation by 1 kHz signal output level : as low as possible
• AM Section
Setting:
RADIO (BAND) button: AM
AM RF signal generator
30% amplitude modulation by 400 Hz signal
• Connecting Level Meter (FM and AM)
Put the lead-wire antenna close to the set.
set
FM FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display 87.5 MHz 108 MHz Reading on Digital voltmeter 1.6 ± 0.4 V 4.0 ± 0.1V Adjustment Part <confirmation> L2
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1 CT1
87.5 MHz 108 MHz
AM FREQUENCY COVERAGE
CHECK
Frequency Display 530 kHz 1,710 kHz
Reading on Digital voltmeter 1.0
– 0.5 V – 0.6 V
+ 0.7 V
4.8
+ 1.2V
Adjustment Part <confirmation> <confirmation>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4 CT3
620 kHz 1,400 kHz
• For AM adjustment, fix the ferrite-rod antenna (L3) as shown below and then perform tracking adjustment at L4 and CT3. Lastly check the voltage.
level meter (range: 0.5–5 V ac
32
set
2
jack (J301)
• Connecting Digital Voltmeter (FM and AM)
digital voltmeter
100 k
TP (VT) (JW17)
• Repeat the procedures in each adjustment several times, and the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors.
Adjustment Location: See page 14.
– 13 –
Adjustment Location:
TRACKING
ADJUSTMENT
TRACKING
ADJUSTMENT
CT3
AM
FREQUENCY
COVERAGE
ADJUSTMENT
FM
L4 L3
L2
FM
CT1
L1
– tuner board (component side) –
TP
(FM ANT)
TP (VT)
(JW17)
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 (TP RFO) and GND on CD board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the 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)
VOLT/DIV : 200 mV (10 : 1 probe in use) TIME/DIV : 500 nS
RF level :
±
0.1 Vp-p
1.2
When observing the eye pattern, set the oscilloscope for AC range and raise vertical sensitivity.
π
Test Point:
– main board (conductor side) –
TP (RFO)
– 14 –
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