Sharp cd k 491 w service manual
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Page 1
CD-K491W
SHARP SERVICE MANUAL
No.50883CDK491W/
CD-K491W
CD-K491 W mini component system consisting of CD-K491W
COMPACT mini component system, CP-K491, CP-SW491, centre
@D§@ (GBOXSOO10AWM3) and surround (GBOXSOO11AWM3)
DIGITAL AUDIO @R'D's EON Speaker system.
on
D I G l T A L - In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified be
Manufactured under license from Dolby Laboratories. used.
"Dolby", "Pro Logic" and the double»D symbol are trademarks
of Dolby Laboratories. Confidential Unpublished Works.
©1992-1997 Dolby Laboratories. Inc. All rights reserved.
osouNn
OQSOUND and the QLogo are registered trademarks of
QSound Labs, Inc.
0 QSound is protected under US Patent Nos. 5,105,462 and
5,208,860 and foreign counterparts.
CONTENTS %
SAFETY PRECAUTION FOR SERVICE MANUAL
VOLTAGE SELECTION
SPECIFICATIONS .....
NAMES OF PARTS
OPERATION MANUAL.
DISASSEMBLY .............
REMOVING AND REINSTALLING THE MAIN PARTS.
ADJUSTMENT ...................................
NOTES ON SCHEMATIC DIAGRAM
TYPES OF TRANSISTOR AND LED.
BLOCK DIAGRAM .............................
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD ..
WAVEFORMS OF CD CIRCUIT
TROUBLESHOOTING ......
FUNCTION TABLE OF IC.
FL DISPLAY ......................
REPLACEMENT PARTS LIST/EXPLODED VIEW
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
CD-K491W
SAFETY PRECAUTION FOR SERVICE MANUAL
WARNINGS
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 OBSERVED DURING SERVICING TO PROTECT YOUR EYES
AGAINST EXPOSURE TO THE LASER BEAM.
1-WHEN THE CABINET IS REMOVED, THE POWER IS TURNED ON WITDOUT A COMPACT DISC IN POSITION ANDTHE
PICK-UP IS ON THE OUTER EDGE THE LASER WILL LIGHT FOR SEVERAL SECONDS TO DETECT A DISC. DO NOT
LOOK INTO THE PICK-UP LENS.
2-THE LASER POWER OUTPUT OF THE PICK-UP UNIT AND REPLACEMENT SERVICE PARTS ARE ALL FACTORY
PRE-SET BEFORE SHIPMENT.
DO NOT ATTEMPT TO RE-ADJUST THE LASER PICK-UP UNIT DURING REPLACEMENT OR SERVICING.
3-UNDER NO CIRCUMSTANCES STARE INTO THE PICK-UP LENS AT ANY TIME.
4-CAUTION-USE OF CONTROLS OR ADJUSTMENTS, OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE
SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.
CAUTION Laser Diode Properties
Materlal: GaAIAs
Wavelength 750 rim
cuss 1 ma Piaullcl Emission Duration. contlnuous
APPAKEII. ii mm a: :ussi I Laser Output: max. 0 6 mW
rnnnum um nr msr I
arms Mini Component System Is ciasinred as 3
CLASS I LASER product.
IThe CLASS I LASER PRODUCT label Is located on
the rear cover.
C Use oi controls. adruscmems or perlormance or pro
cedures other than those speeiiIed herein may result
In hazardous radiation exposure,
As the laser beam used in mIs compact dlsc ptayer
Is harmlul lo the eyes. do not attempt to disassemble
the Cabinet Reier Servicing to qualllred personnel
only.
VARO ! Avattaessa ja suojalukitus ohitettaessa olet alttiina nakyméttomalle lasersateilylle. Ala katso sateeseen.
VARNING! Osynlig laserstralning nar denna del ér oppnad och sparren ar urkopplad. Betrakta ej stralen.
VOLTAGE SELECTION
The voltage selector is located on the AC voltage selector box. If adjustment is necessary, use a screwdriver in order to turn the
selector in either direction until the correct voltage figure is displayed in the window next to the adjustment screw.
QACCAOOOI AWOO QACCLOOOSAWOO
é
% :g
QACCEOOOBAWOO QACCBOOOGAWOO
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I .r
92LPLUGOZ7
QACCJ0003AW00 92LPLUG155A
Figure 2 AC POWER SUPPLY CORD AND AC PLUG ADAPTOR
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