CD-MD3000 (serv.man10) - Sharp Audio Service Manual (repair manual)

Page

SAFETY PRECAUTION OF MD SECTION FOR  SERVICE MANUAL .............................................................................. 2
SAFETY PRECAUTION OF CD SECTION FOR  SERVICE MANUAL (FOR CD-MD3000H) ........................................... 3
IMPORTANT SERVICE NOTES (CD-MD3000H FOR U.K. ONLY) ..................................................................................  3
SAFETY PRECAUTION OF CD SECTION FOR SERVICE MANUAL (FOR CD-MD3000W) ............................................ 4
VOLTAGE SELECTION (FOR CD-MD3000W ONLY) ....................................................................................................... 4
SPECIFICATIONS .............................................................................................................................................................  5
NAMES OF PARTS ...........................................................................................................................................................  6
OPERATION MANUAL ......................................................................................................................................................  9
DISASSEMBLY ................................................................................................................................................................  16
REMOVING AND REINSTALLING THE MAIN PARTS ...................................................................................................  20
CD CHANGER MECHANISM MAIN BASE PARTS ASSEMBLING/ADJUSTING PROCEDURE ...................................  23
ADJUSTMENT .................................................................................................................................................................  30
TEST MODE ....................................................................................................................................................................  32
EEPROM WRITING PROCEDURE .................................................................................................................................  43
ERROR MESSAGE LIST .................................................................................................................................................  44
NOTES ON SCHEMATIC DIAGRAM ..............................................................................................................................  46
BLOCK DIAGRAM ...........................................................................................................................................................  47
SCHEMATIC DIAGRAM ..................................................................................................................................................  54
WIRING SIDE OF P.W.BOARD .......................................................................................................................................  70
TYPES OF TRANSISTOR AND LED ...............................................................................................................................  84
VOLTAGE ........................................................................................................................................................................  84
WAVEFORMS OF CD CIRCUIT ......................................................................................................................................  85
WAVEFORMS OF MD CIRCUIT .....................................................................................................................................  86
TROUBLESHOOTING .....................................................................................................................................................  88
FUNCTION TABLE OF IC ................................................................................................................................................  94
WIRING OF PRIMARILY SUPPLY LEADS (CD-MD3000H FOR U.K. ONLY) ............................................................... 109
LCD DISPLAY ................................................................................................................................................................. 110
PARTS GUIDE/EXPLODED VIEW/ PACKING METHOD (CD-MD3000H 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.

Recording and playback of any material may require consent
which SHARP is unable to give. Please refer particularly to the
provisions of Copyright Act 1956, the Dramatic and Musical
Prefomers Protection Act 1956, the Preformers Protection Acts
1963 and 1972 and to any subsequent statutory enactments and
orders.

– 2 –

The AEL (ACCESSIBLE EMISSION 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  LASERSTR LNING  N R  DENNA  DEL   R  …PPNAD  OCH  SP RRAR
 R  URKOPPLADE.  STR LEN   R  FARLIG.

ADVARSEL - USYNLIG  LASERSTR LING  N R  DEKSEL   PNES  OG  SIKKERHEDSL S
BRYTES.  UNNG   EKSPONERING  FOR  STR LEN.

VARO!  AVATTAESSA  JA  SUOJALUKITUS  OHITETTAESSA  OLET  ALTTIINA
N KYM T…N  LASERS TEILYLLE.   L   KATSO  S TEESEN.

VARNING - OSYNLIG  LASERSTR LING  N R  DENNA  DEL   R  …PPNAD  OCH  SP RREN
 R  URKOPPLAD.  BETRAKTA  EJ  STR LEN.

ADVARSEL - USYNLIG  LASERSTR LING  VED   BNING  N R  SIKKERHEDSAFBRYDERE
ER  UDE  AF  FUNKTION.  UNDG   UDSETTELSE  FOR  STR LING.

– 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.

Laser Diode Properties

Material: GaAIAs
Wavelength: 780 nm
Emission Duration: continuous
Laser Output: max. 0.6 mW

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.

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

CHASSIS SCREW

– 4 –

Before operating the unit on mains, check the preset voltage. If the voltage is different from your local voltage, adjust the voltage
as follows, Turn the selector with a screwdriver until the appropriate voltage number appears in the window (110 V, 127 V,
220 V or 230 V - 240 V AC).

QACCB0009AW00

QACCE0008AW00

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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.

 

Laser Diode Properties
Material: GaAIAs
Wavelength: 780 nm
Emission Duration: continuous
Laser Output: max. 0.6 mW

This Audio Tower System is classified as a CLASS 1 LA-
SER product.

The CLASS 1 LASER PRODUCT label is located on the 
rear cover.

 

Use of controls, adjustments or performance of proce-
dures other than those specified herein may result in haz-
ardous radiation exposure.

As the laser beam used in this compact disc player is 
harmful to the eyes, do not attempt to disassemble the 
cabinet. Refer servicing to qualified personnel only.

 

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.

QACCA0003AW00

QPLGA0004AWZZ

QPLGA0003AWZZ