Sony WX-C570 User manual

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Model Name Using Similar Mechanism NEW
CD Drive Mechanism Type MG-338X-121
Optical Pick-up Name KSS-520A
Model Name Using Similar Mechanism XR-1750
Tape Transport Mechanism Type MG-52A-135
SERVICE MANUAL
US Model
UK Model
E Model
WX-C570
CHANGER CONTROL AUDIO MASTER
MICROFILM
AUDIO POWER SPECIFICATIONS (US Model)
POWER OUTPUTAND TOTAL HARMONIC DISTORTION
17 watts per channel minimum continuous average power into 4 ohms,
4 channels driven from 20 Hz to 20 kHz with no more than 1 % total
harmonic distortion.
Other Specifications
CD player section
Signal-to-noise ratio 88 dB
Frequency response 10 - 20,000 Hz
Wow and flutter Below measurable limit
Laser Diode properties
Material GaAlAs
Wavelength 780 nm
Emission Duration Continuous
Laser output power 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.
Cassette player section
Tape track 4-track 2-channel stereo
Wow and flutter 0.08 % (WRMS)
Frequency response 30 - 18,000 Hz
Signal-to-noise ratio
Cassette type Dolby B NR Dolby NR off
TYPE II, IV 67 dB 58 dB
TYPE I 64 dB 55 dB
SPECIFICATIONS
Tuner section
FM
Tuning range US model:
87.5 - 107.9 MHz
UK, E model:
FM tuning interval:
50 kHz/200 kHz switchable
87.5 - 108.0 MHz
(at 50 kHz step)
87.5 - 107.9 MHz
(at 200 kHz step)
Antenna terminal External antenna connector
Intermediate frequency 10.7 MHz
Usable sensitivity 9 dBf
Selectivity 75 dB at 400 kHz
Signal-to-noise ratio 65 dB (stereo),
68 dB (mono)
Harmonic distortion at 1 kHz
0.5% (stereo),
0.3% (mono)
Separation 35 dB at 1 kHz
Frequency response 30 - 15,000 Hz
Capture ratio 4 dB
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CD
Section
TC
Section

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AM
Tuning range US model:
530 - 1,710 kHz
UK, E model:
AM tuning interval:
9 kHz/10 kHz switchable
531 - 1,602 kHz
(at 9 kHz step)
530 - 1,710 kHz
(at 10 kHz step)
Antenna terminal External antenna connector
Intermediate frequency 10.71 MHz/450 kHz
Sensitivity 30 µV
Power amplifier section
Outputs Speaker outputs
(sure seal connectors)
Speaker impedance 4 - 8 ohms
General
Outputs Power antenna control
lead
Power amplifier control
lead
Telephone mute control
lead
Line outputs (2)
Tone controls Bass ±8 dB at 100 Hz
Treble ±8 dB at 10 kHz
Power requirements 12 V DC car battery
(negative ground)
Dimensions Approx. 178 ×100 ×173 mm
(7 1/8 ×4 ×6 7/8 in.)
(w/h/d)
Mounting dimension Approx. 178 ×100 ×155 mm
(7 1/8 ×4 ×6 1/8 in.)
(w/h/d)
Mass Approx. 2.1 kg (4 lb. 10 oz.)
Supplied accessories Parts for installation and
connections (1 set)
Decoy cover (1)
Design and specifications are subject to change without
notice.
SERVICE NOTE
CAUTION
Use of controls or adjustments or performance of proce-
dures other than those specified herein may result in haz-
ardous radiation exposure.
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, ob-
serve from more than 30 cm away from the objective lens.
NOTES ON PICK-UP FLEXIBLE BOARD
The pick-up flexible board in this set is secured to the optical pick-
up with an adhesive tape. Once the tape is removed, an adhering
force becomes weak, and it cannot be reused.
Therefore, if the optical pick-up is replaced, replace also the pick-
up flexible board with a new one.
NOTES ON CLEANINGTHE 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 PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
optical pick-up
Notes:
Do not force to push the objective lens. Otherwise, the plate spring
supporting the objective lens will be bent, causing a deteriorated
RF waveform.
Never touch anything other than the objective lens. Otherwise, a
significant deterioration occurs in the RF waveform.
ApplyCD lenscleaner B-4(Part No.:J-2501-000-A)tocotton swabs
(narrowtype)(PartNo.:J-2501-023-A)tobelightlywet.Useaforce
(about 5 g (0.18 oz)) to make the objective lens in contact with the
bottom lightly, and clean the lens by spirals as following below.
Replace the cotton swab and repeat this cleaning two or three times.
cotton swabs
objective lens
2-axis actuato
r
2-axis cover
slide base
surface of objective lens

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TABLE OF CONTENTS
1. GENERAL
Location of Controls............................................................... 4
Getting Started........................................................................ 4
Setting the Clock .................................................................... 4
CD Player ............................................................................... 5
Cassette Player ....................................................................... 5
Radio ...................................................................................... 6
Other Functions ...................................................................... 7
CD/MD Changer .................................................................... 8
Connections ............................................................................ 9
2. DISASSEMBLY
2-1. Front Panel ....................................................................... 11
2-2. Control Board................................................................... 11
2-3. CD Mechanism Block ...................................................... 12
2-4. Heat Sink .......................................................................... 12
2-5. CD Board ......................................................................... 13
2-6. Tape Mechanism Block .................................................... 13
2-7. Main Board ...................................................................... 14
2-8. Chassis (T) Assy............................................................... 14
2-9. Lever (Release T) ............................................................. 15
2-10. Servo Board...................................................................... 15
2-11. RollerAssy ....................................................................... 16
2-12. Chassis (OP) (O/S) Assy .................................................. 16
2-13. Optical Pick-up Block ...................................................... 17
3. ASSEMBLY OFTAPE MECHANISM
Alignment of Rotary Switch................................................. 18
Gear (LDG-E)....................................................................... 18
Chassis (S) Assy ................................................................... 19
Lever (Mode)........................................................................ 19
Lever (Pinch Selection) ........................................................ 20
Head Plate Assy .................................................................... 20
Lever (Pinch) Assy ............................................................... 21
Housing ................................................................................ 21
Arm (Suction)....................................................................... 22
Lever (LDG-A)/(LDG-B)..................................................... 22
Gear (LDG-FT) .................................................................... 23
Guide (C) .............................................................................. 23
4. MECHANICAL ADJUSTMENTS.............................. 24
5. ELECTRICAL ADJUSTMENTS
Tape Section ......................................................................... 24
Tuner Section........................................................................ 25
CD Section ........................................................................... 28
6. DIAGRAMS
6-1. Block Diagram –CD Section–.......................................... 29
6-2. Block Diagram –Tape Section– ....................................... 31
6-3. Block Diagram –Main Section–....................................... 33
6-4. Circuit Boards Location ................................................... 35
6-5. Printed Wiring Board –CD Section–................................ 36
6-6. Schematic Diagram –CD Section–................................... 39
6-7. Printed Wiring Boards –CD Mechanism Section–........... 42
6-8. Schematic Diagram –CD Mechanism Section– ............... 45
6-9. Printed Wiring Boards –Main Section– ........................... 49
6-10. Schematic Diagram –Main Section–................................ 53
6-11. Printed Wiring Board –Control Section– ......................... 58
6-12. Schematic Diagram –Control Section– ............................ 63
6-13. IC Pin Descriptions .......................................................... 70
7. EXPLODEDVIEWS
7-1. Cover Section ................................................................... 74
7-2. Front Panel Section .......................................................... 75
7-3. Chassis Section ................................................................ 76
7-4. CD Mechanism Section (1) .............................................. 77
7-5. CD Mechanism Section (2) .............................................. 78
7-6. CD Mechanism Section (3) .............................................. 79
7-7. Tape Mechanism Section (1) ............................................ 80
7-8. Tape Mechanism Section (2) ............................................ 81
8. ELECTRICAL PARTS LIST.................................... 82

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SECTION 1
GENERAL This section extracted from
E model’s instruction manual.

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– 7 –

– 8 –

– 9 –

– 10 –

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SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. FRONT PANEL
2-2. CONTROL BOARD
1 PTT 2.6x1
4
3 PTT 2.6x6
5 PTT 2.6x6
4 PTT 2.6x6
9 claws
8 claws
0 front panel assy
6 PTT 2.6x10
7 cover
2 PTT 2.6x6
1 knob (VOL)
4 knob (D-BASS)
3 CONTROL boar
d
2 P 2x8

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2-3. CD MECHANISM BLOCK
2-4. HEAT SINK
5 PTT 2.6x
6
1 PTT 2.6x10
2 PTT 2.6x6
3 CN401
6 bracket (CD)
4 CD mechanism block
1 PTT 2.6x10
4 heat sink
2 PTT 2.6x10
3 PTT 2.6x1
0

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2-5. CD BOARD
2-6.TAPE MECHANISM BLOCK
1 CN802
3 CN403
2 CN404
4 ground point screws
(PTT 2.6x6)
6 CD board
5 claw
4 CN305
2 PTT 2.6x6
3 PTT 2.6x6
5 tape mechanism block
1 CN304

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2-7. MAIN BOARD
2-8. CHASSIS (T) ASSY
5 P 2x3
7 chassis (T) ass
y
6 P 2x3
3 PS 2x3
4 IN SW board
2 Down the lever (IN SW).
1 CN4
2 MAIN board
3 insulating shee
t
1 ground point screws
(PTT 2.6x6)

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2-9. LEVER (RELEASET)
2-10. SERVO BOARD
2 guide (disc)
4 claws
1 claws
5 lever (release T)
3 tension sprin
g
4 PS 2x4
3 PS 2x4
6 P 2x3
7 loading motor assy
2 CN2
5 SERVO board
1 CN3

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2-12. CHASSIS (OP) (O/S) ASSY
Note: Positions the arm (roller) and washer as shown in the Fig. 1.
2-11. ROLLER ASSY
5 roller assy
3 cotter polyethylene washer
6 PS 2x3
7 LOAD SW board
1 tension spring (RA-E)
2 compression spring (RA-C)
4 arm (roller)
Fig.1
washer washer washer
arm arm
6 chassis (OP) (O/S) assy
7 compression spring (FL)
8 compression spring (FL)
1 tension spring (angle)
3 damper (T)
2 damper (T)
4 Slide the lever (D)
in the direction of
the arrow.
5 Turn the loading ring
in the direction of the
arrow.

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2-13. OPTICAL PICK-UP BLOCK
1 P 2x3
2 sled motor assy
3 optical pick-up bloc
k

– 18 –
SECTION 3
ASSEMBLY OFTAPE MECHANISM
Note : Follow the assembly procedure in the numerical order given.
ALIGNMENT OF ROTARY SWITCH
GEAR (LDG-E)
1 Align Δ mark on the rotary switch
the position shown in the figure.
2 Align hole in the gear (LDG-D) with
the position shown in the figure.
chassis (S) assy
hole
2 Install the gear (LDG-E).
1 Align hole as shown in the figure.
chassis (S) assy

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CHASSIS (S) ASSY
LEVER (MODE)
1. Align ¢ mark on the rotary switch with
hole in the lever (mode).
2. Fit on positions
A , B and C and install
the lever (mode).
2 screw (PS 2x4)
3 screw (PS 2x4)
1 chassis (S) assy
Δ mark on rotary switch
hole in lever (mode)
lever (mode)
rotary switch
C
A
B

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LEVER (PINCH SELECTION)
HEAD PLATE ASSY
2 lever (pinch selection
)
1 Align.
6 step screw (HP)
3 Press the ATS lever.
4 Position the head plate
sub assy as shown
in the figure.
1 Fit in groove.
5 step screw (HP)
2 Fit shaft in groove.
head plate sub assy
groove
ATS lever