DOWNLOAD Sharp SD-CX1 (serv.man4) Service Manual ↓ Size: 1.14 MB | Pages: 11 in PDF or view online for FREE

Page

SAFETY PRECAUTION OF MD SECTION FOR  SERVICE MANUAL .............................................................................. 2
SAFETY PRECAUTION OF CD SECTION FOR  SERVICE MANUAL .............................................................................. 3
IMPORTANT SERVICE NOTES (FOR U.K. ONLY) ..........................................................................................................  3
SPECIFICATIONS .............................................................................................................................................................  4
NAMES OF PARTS ...........................................................................................................................................................  5
OPERATION MANUAL ......................................................................................................................................................  7
DISASSEMBLY ................................................................................................................................................................  12
REMOVING AND REINSTALLING THE MAIN PARTS ...................................................................................................  15
DESCRIPTION OF CIRCUIT FOR 1-BIT AMP. UNIT .....................................................................................................  17
TO CHECK AND CANCEL PROTECT CIRCUIT DETECTION LINE ..............................................................................   18
TEST MODE ....................................................................................................................................................................  19
ADJUSTMENT .................................................................................................................................................................  24
ERROR MESSAGE LIST .................................................................................................................................................  33
EEPROM WRITING PROCEDURE .................................................................................................................................  34
NOTES ON SCHEMATIC DIAGRAM ..............................................................................................................................  37
TYPES OF TRANSISTOR AND LED ...............................................................................................................................  37
BLOCK DIAGRAM ...........................................................................................................................................................  38
SCHEMATIC DIAGRAM ..................................................................................................................................................  42
WIRING SIDE OF P.W.BOARD .......................................................................................................................................  56
WAVEFORMS OF 1 BIT AMP. CIRCUIT .........................................................................................................................  69
WAVEFORMS OF MD CIRCUIT .....................................................................................................................................  70
WAVEFORMS OF CD CIRCUIT ......................................................................................................................................  72
TROUBLESHOOTING .....................................................................................................................................................  74
FUNCTION TABLE OF IC ................................................................................................................................................  83
FL DISPLAY .................................................................................................................................................................... 101
PARTS GUIDE/EXPLODED VIEW
PACKING METHOD (FOR U.K. ONLY)

 • In the interests of user-safety the set should be restored to its original

condition and only parts identical to those specified should be used.

– 2 –

The AEL (Accessible Emisson Level) of the laser power output is less than class 1 but the laser component is capable of emitting radiation
exceeding the limit for Class 1. Therefore it is important that the following precautions are observer during servicing to protect your eyes
against exposure to the laser beam.
1) When the unit case cover is removed and LOADING SW (SW 1956) is turned on and then PLAY SW (SW 1954 mechanism PWB) is turned

on in a few second.

    The laser will light for several second to detect a disk.
2) The laser power output of the pickup unit and replacement service parts are all factory pre-set before shipment.
    Do not attempt to re-adjust the laser pickup unit during replacement or servicing.
3) Under no circumstances stare into the pickup lens at any time.
4) If laser optical unit becomes faulty, replace the complete laser optical unit.
5) CAUTION-Use of controls or adjustments, or performance of procedures other than those specified herein may result in hazardous

radiation exposure.

VARO !

Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle. Älä katso säteeseen.

VARNING!

Osynlig laserstralning när denna del är öppnad och spärren är urkopplad. Betrakta ej strälen.

Precaution to be taken when replacing and servicing the laser pickup.
The following precautions must be observed during servicing to protect your eyesvagainst exposure to the laser.
Warning of possible eye damage when repairing:
If the AC power plug is connected when the inner cover of the unit is removed, the laser will light up during focus  access (about
1 second) (Fig. 2-1).
During this operation, the laser will leak from the opening between the magnetic head and cartridge holder (Fig. 2-2).
In order to protect your eyes, you must not look at the laser during repair.
Before repairing, be sure to disconnect the AC power plug.

Magnetic Head

Optical Pickup

,,

Magnetic Head

Optical Pickup

Spindle Motor

Laser Beam

Cartridge Holder

Mechanism
Chassis

Laser Diode Properties

●

Material: GaAlAs

●

Wavelength: 785 nm

●

Pulse time:
Read mode: 0.8 mW Continuous
Write mode: max 10 mW 0.5S

min cycle 1.5S
Repetition

CAUTION - INVISIBLE  LASER  RADIATION  WHEN  OPEN  AND  INTERLOCKS  DEFEATED 
AVOID  EXPOSURE  TO  BEAM .

VARNING - OSYNLIG  LASERSTRÅLNING  NÄR  DENNA  DEL  ÄR  ÖPPNAD  OCH  SPÄRRAR
ÄR  URKOPPLADE.  STRÅLEN  ÄR  FARLIG.

ADVARSEL - USYNLIG  LASERSTRÅLING  NÅR  DEKSEL  ÅPNES  OG  SIKKERHEDSLÅS
BRYTES.  UNNGÅ  EKSPONERING  FOR  STRÅLEN.

VARO!  AVATTAESSA  JA  SUOJALUKITUS  OHITETTAESSA  OLET  ALTTIINA
NÄKYMÄTÖN  LASERSÄTEILYLLE.  ÄLÄ  KATSO  SÄTEESEN.

VARNING - OSYNLIG  LASERSTRÅLING  NÄR  DENNA  DEL  ÄR  ÖPPNAD  OCH  SPÄRREN
ÄR  URKOPPLAD.  BETRAKTA  EJ  STRÅLEN.

ADVARSEL - USYNLIG  LASERSTRÅLING  VED  ÅBNING  NÅR  SIKKERHEDSAFBRYDERE
ER  UDE  AF  FUNKTION.  UNDGÅ  UDSETTELSE  FOR  STRÅLING.

– 3 –

Precaution to be taken when replacing and servicing the Laser Pickup.
The AEL (Accessible Emission Level) of Laser Power Output for this model is specified to be lower than Class 1 Requirements.
However, the following precautions must be observed during servicing to protect your eyes against exposure to the Laser
beam.
(1) When the cabinet has been removed, the power is turned on without a compact disc, and the Pickup is on a position outer

than the lead-in position, the Laser will light for several seconds to detect a disc. Do not look into the Pickup Lens.

(2) The Laser Power Output of the Pickup inside the unit and replacement service parts have already been adjusted prior to

shipping.

(3) No adjustment to the Laser Power should be attempted when replacing or servicing the Pickup.
(4) Under no circumstances look directly into the Pickup Lens at any time.
(5) CAUTION - Use of controls or adjustments, or performance  of procedures other than those specified herein may result in

hazardous radiation exposure.

Before returning the unit to the customer after completion of a
repair or adjustment it is necessary for the following withstand
voltage test to be applied to ensure the unit is safe for the
customer to use.
Setting of Withstanding Voltage Tester and set.

Set name

set value

Withstanding Voltage Tester

Test voltage

4,240 VPEAK
3,000 VRMS

Set time

6 secs

Set current (Cutoff current)

4 mA

Unit

Judgment

OK: The “GOOD” lamp lights.
NG: The “NG” lamp lights and the buzzer sounds.

PROBE

AC

OUT

UNIT

SHORT-CIRCUIT
AC POWER
SUPPLY CORD

CONNECT THE PROBE
TO GND OF CHASSIS
SCREW

WITHSTANDING

VOLTAGE TESTER

LASER KLASSE 1

LUOKAN 1 LASERLAITE

KLASS 1 LASERAPPARAT

– 4 –

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.

Specifications for this model are subject to change without prior notice.

AC 230 V, 50 Hz

Power on: 42 W
Power stand-by: 0.6 W (*)

Width: 330 mm (13") 
Height: 208 mm (8-3/16") 
Depth: 190 mm (7-1/2")

5.0 kg (11 lbs.)

( * )

This power consumption value is obtained when the demonstration mode is can-
celled in the power stand-by mode. Cancel the demonstration mode.

64fs 1-bit switching
(Remarks: fs = 44.1 kHz)

RMS: 40 W (20 W + 20 W) (DIN 45 324)

7th-order       (delta - sigma) modulation

Speakers: 6 ohms
Headphones: 16 - 50 ohms (recommended: 32 ohms)

Auxiliary: 500 mV/47 kohms

1-disc vertical compact disc player

Non-contact, 3-beam semiconductor laser pickup

1-bit D/A converter

20 - 20,000 Hz

90 dB (1 kHz)

MiniDisc Recorder

Non-contact, 3-beam semiconductor laser pickup

400 - 900 rpm CLV, Approx.

ACIRC (Advanced Cross Interleave Reed-Solomon Code)

20-bit linear (A/D converter)

ATRAC (Adaptive TRansformed Acoustic Coding), 
ATRAC 3

44.1 kHz

Magnetic modulation overwrite method

20 - 20,000 Hz

1-bit D/A converter

Unmeasurable (less than 0.001% W. peak)

95 dB (1 kHz)

90 dB (1 kHz)

Stereo: 2 channels (SP, LP2, LP4)
Monaural: 1 channel (MONO)

FM: 87.5 - 108 MHz
AM: 522 - 1,620 kHz

2-way type speaker system
2 cm (13/16") Tweeter
12 cm (4-3/4") Woofer

40 W

20 W

6 ohms

Width: 170 mm (6-3/4") 
Height: 300 mm (11-13/16") 
Depth: 186 mm (7-3/8")

2.0 kg (4.4 lbs.)/each

■

■

■

■

■