Sharp md mx 30 service manual

Page 1

MD-MX3OH

SHARP SERVICE MANUAL

No.85924MDMX30H

MD-MX30H

MD-MXSOH MD Compact Component System
consisting of MD-MX30H(main unit) and CP-

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0° MX30H(speaker system).
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COMPACT - In the interests 01 usersafety the set should be restored to its original
condition and only parts identical to those specified should be used.
I) '5
DIGITAL Aunio EON -Note for users in UK

Recording and playback ol 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
Prelormers Protection Acts 1963 and 1972 and to any subsequent statutory
enactments and orders.

/- CONTENTS %

SAFETY PRECAUTION FOR SERVICE MANUAL.
IMPORTANT SERVICE NOTES (FOR UK. ONLY).
SPECIFICATIONS ....................................................
NAMES OF PARTS
OPERATION MANUAL ..
DISASSEMBLY ..........
REMOVING AND REINSTALLING THE MAIN PARTS ,.
TEST MODE ................................................................
ADJUSTMENT ...............................
EEPROM WRITING PROCEDURE
EXPLANATION OF ERROR DISPLAY.
RDS OPERATION .............................
NOTES ON SCHEMATIC DIAGRAM
TYPE OF TRANSISTOR AND LED
BLOCK DIAGRAM .........................
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD
WAVEFORMS OF CD CIRCUIT
WAVEFORMS OF MD CIRCUIT
TROUBLESHOOTING (CD SECTIO )
TROUBLESHOOTING (MD SECTION)
FUNCTION TABLE OF IC .....................
REPLACEMENT PARTS LlST/EXPLODED VIEW/PACKING OF THE SET (FOR UK.)

\ /

-
This document has been published to be used
SHARP CORPORATION for after sales service only.

The contents are subject to change without notice.

Page 2

MD-MX3OH

SAFETY PRECAUTION FOR SERVICE MANUAL

WARNINGS (CD)
THEAEL(ACCESSIBLE EMISSION LEVEL)OFTHELASER POWER
OUTPUT IS LESS THAN CLASS 1 BUT THE LASER COMPONENT
IS CAPABLE OF EMITTING RADIATION EXCEEDING THE LIMIT
FOR CLASS I. THEREFORE IT IS IMPORTANT THAT THE
FOLLOWING PRECAUTIONS ARE OBSERVED DURING
SERVICING TO PROTECTYOUR EYES AGAINST EXPOSURE TO
THE LASER BEAM.
1-WHEN THE CABINET IS REMOVED, THE POWER IS TURNED
ON WITHOUTA COMPACT DISC IN POSITION AND THE PICKUP
IS ON THE OUTER EDGE 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 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 STAREINTOTHE PICKUP LENS
AT ANY TIME.

4-CAUTION-USE OF CONTROLS OR ADJUSTMENTS, OR
PERFORMANCE OF PROCEDURES OTHER THAN THOSE
SPECIFIED HEREINMAYRESULT IN HAZARDOUSRADIATION
EXPOSURE.

WARNINGS (MD)

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 tor 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 tor 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-ad)ust 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.

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CLASS I LASEK PMDUET
IPPAREIL A LASER DE ELASSE I
PIII'II'IUCTII LASER I'IE ELISE I

LASER KLASSE 1
LUOKAN 1 LASERLAlTE
KLASS 1 LASEHAPPARAT
usERnziDvr

LASER menu m1 wt

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VAHOITpSiuLAnrEEN KAYTTAMINEN MUULLA
KUIN TASSA KAVTTOOHJEESSA MAJ NI T__ULVI._A
TAVALLA SAATTAA ALTI STAA KAYITAJAN
TURVALLI SQUSLUOKAN "1 YLITTAVALLE
NAKYMAI'I'OMALLE LASEHSATEILYLLE.

VARNING - OM APPARATEN ANVANDS PA ANNAT
SATT AN I DENNA B__RUKSANVI SNI NG SPECIUFI
CERAS. KAN ANVANDAREN UT__SATTAS FOR
OSYNLIG LASERSTRALNING, SOM OVEHSKRIDER
GHANSEN FOR LASERKLASS 1.

VARNING!

VARO ! Avattaessa ja suojalukitus ohitettaessa olet alttiina nakymattomalle lasersateilylle. Ala katso sateeseen.
Osynlig laserstralning nar denna del ar oppnad och sparren ar urkopplad. Betrakta ej stralen.

Precaution to be taken when replacing and servicing the
laser pickup.

Thefollowing precautionsmust be observedduring 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. 22).
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

Figure 2-1
Magnetic Head
/-Laser Beam
%.
Cartridge Holder

Mechanism
Chassis

Spindle Motor

Optical Pickup
Figure 2-2