DX-SX1 (serv.man2). Including circuit diagrams - Sharp Audio Service Manual (repair manual)

– 1 –

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

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

Page

SAFETY PRECAUTION FOR SERVICE MANUAL ...........................................................................................................  2
IMPORTANT SERVICE NOTES (FOR U.K. ONLY) ..........................................................................................................  3
SPECIFICATIONS .............................................................................................................................................................  3
NAMES OF PARTS ...........................................................................................................................................................  4
OPERATION MANUAL ......................................................................................................................................................  5
DISASSEMBLY ..................................................................................................................................................................  6
REMOVING AND REINSTALLING THE MAIN PARTS .....................................................................................................  8
ADJUSTMENT .................................................................................................................................................................  10
BLOCK DIAGRAM ...........................................................................................................................................................  12
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD .............................................................................................  18
NOTES ON SCHEMATIC DIAGRAM ..............................................................................................................................  41
TYPES OF TRANSISTOR AND DIODE ..........................................................................................................................  41
FUNCTION TABLE OF IC ................................................................................................................................................  42
WIRING OF PRIMARILY SUPPLY LEADS (FOR U.K. ONLY) ........................................................................................  66
PARTS GUIDE/EXPLODED VIEW/PACKING METHOD (FOR U. K. ONLY)

– 2 –

The AEL (Accessible Emission Level) of Laser Power Output
for this model is specified to be lower than Class I 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.

LASER KLASSE 1

LUOKAN 1 LASERLAITE

KLASS 1 LASERAPPARAT

CAUTION-INVISIBLE  LASER  RADIATION  WHEN  OPEN.  DO  NOT  STARE  INTO 
BEAM  OR  VIEW  DIRECTLY  WITH  OPTICAL  INSTRUMENTS.

VARNING-OSYNLIG  LASERSTRALNING  NAR  DENNA  DEL  AR  OPPNAD.  STIRRA
EJ  IN  I  STRALEN  OCH  BETRAKTA  EJ  STRALEN   MED  OPTISKA  INSTRUMENT.

ADVERSEL-USYNLIG  LASERSTRALING  VED  ABNING.  SE  IKKE  IND  I 
STRALEN-HELLER  IKKE  MED  OPTISKE  INSTRUMENTER.

VARO!  AVATTAESSA  OLET  ALTTIINA  NAKYMATON  LASERSATEILYLLE.
ALA  TUIJOTA  SATEESEEN  ALAKA  KATSO  SITA  OPTISEN  LAITTEEN  LAPI.

VARNING-OSYNLIG  LASERSTRALNING  NAR  DENNA  DEL  AR  OPPNAD.
STIRRA  EJ IN  I  STRALEN  OCH  BETRAKTA  EJ  STRALEN  GENOM  OPTISKT  
INSTRUMENT.

ADVERSEL-USYNLIG  LASERSTRALING  NAR  DEKSEL  APNES.  STIRR IKKE  
INN  I  STRALEN  ELLER  SE  DIREKTE  MED  OPTISKE  INSTRUMENTER.

Laser Diode Properties

Material: GaAIAs
Wavelength: 780 nm/650 nm
Emission Duration: continuous
Laser Output: max. 0.7 mW

– 3 –

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

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

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

2,120 VPEAK
1,500 VRMS

Set time

60 secs

Set current (Cutoff current)

4 mA

Unit

Judgment

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

SHORT-CIRCUIT
AC POWER 
SUPPLY CORD

CONNECT THE PROBE
TO GND 

OF CHASSIS

SCREW

 PROBE

AC

UNIT

WITHSTANDING
VOLTAGE TESTER

+

-

OUT

Stereo 2 channels

Frequency range: 2 Hz - 100 kHz

(Super Audio CD) 

2 Hz - 50 kHz

(Super Audio CD) 
2 Hz - 20 kHz
(CD)

0.0012 % (1 kHz, 2 V)

105 dB or more
(Super Audio CD) 

Unmeasurable (less than

±

0.001 % W. peak)

1-bit digital output terminal
x 1
RCA coaxial digital output
x 1
Square type optical digital
output x 1
RCA analog output
(FIXED) x 1
RCA analog output (VARI-
ABLE) x 1
Headphone jack [3.5 mm
(1/8”)] x 1

AC input x 1

Width; 300 mm (11 - 13/16”)
Height; 66 mm (2 - 5/8”)
Depth; 382 mm (15 - 1/16”)

Approx. 5.8 kg (12.79 lbs.)

230 V, 50 Hz

16 W

– 4 –

T

urns the player on or of

f.

Use headphones of 16 - 50 ohms (32 ohms

recommended) impedance with a 3.5 mm (1/

8”) diameter stereo mini plug.

V

olume can be adjusted using the volume

buttons on the remote control.

Used to set the mode to “SACD” or “CD” on

a hybrid disc.

Locates the beginning of tracks. Press and

hold down during playback for fast forward

or fast reverse.

Opens or closes the disc tray

.

Stops the disc.

Stops the disc temporarily

.

Plays the disc.

Used to select tracks directly

.

Used to change the order of tracks.

Clears the programmed tracks.

Used to set the mode to “SACD” or “CD” on

a hybrid disc.

Stops the disc.

Press and hold down during playback for fast

forward or fast reverse.

Opens or closes the disc tray

.

Displays playing time and remaining time

of each track, and total remaining time of

the disc.

Used to set the playback mode to “normal

playback”, “all tracks repeat play”, “single

track repeat play”, or “random play”.

Plays the disc.

Stops the disc temporarily

.

Used to locate the beginning of tracks.

Control the headphone output and the line

output (V

ARIABLE) levels at the same time.