Onkyo DX 1800 Service Manual

Page 1

SERIAL N0. 3359

ONKYO® SERVICE MANUAL

, COMPACT DISC PLAYER
MODEL DX-1800

Black model

BUDN, BUD

120V AC, 60Hz

BUG

220V AC, SUHz

BUU

110/120/220/240V AC , 50/60Hz

BUQA, BUQB

240V AC, 50Hz

SAFETY-RELATED COMPONENT WARNING

COMPONENTS IDENTIFIED BY MARK A ON THE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ONKYO PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL.

MAKE LEAKAGE-CURRENT OR RESISTANCE MEA-
SUREMENTS TO DETERMINE THAT EXPOSED PARTS
ARE ACCEPTABLY INSULATED FROM THE SUPPLY
CIRCUIT BEFORE RETURNING THE APPLIANCE TO
THE CUSTOMER.

ONKYO
Alllllll BUMPIINHIIS

SPECIFICATIONS

Signal readout system:
Reading rotation:

Optical non-contact

About 500~200 rpm.

(constant linear velocity)
1.2~1.4m/s

Cross interleave readsolomon code
18 bits linear

352.8kHz (8 times oversampling)

Linear velocity:

Error correction system:
Decoded bits:

Sampling frequency:
Number of channels: 2 (Stereo)

Frequency response: 5Hz~20kHz

Total harmonic distortion: 0.004% (at lkl-Iz)

Dynamic range: 98dB

Signal to noise ratio: IOOdB

Channel separation: 100dB (at IkHz)

Wow and Flutter: Below threshold of measurability

Power consumption: 12 watts
Output level: 2 volts r.mis.
Dimensions (WXHXD): 435x112x305mm

17-1/8X4-7/16>< 12

Weight: 4.6kg. 11-13/16 lbsi

Specifications are subject to change without notice.

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IX-1800

TABLE OF CONTENTS

Specifications .................... .................... 1
Service procedures
Note on cmpacc disc .........................

.......2
....2
Caution of replacement of optical pickup ..........-...3
Protection of eyes from laser beam during servicing "'4
Laser warning label .......... ......................... 4
Nechanisn exploded View - -"'-""-"-~~"'
Exploded viev -~ ---------
Parts list. -0"

.. ....g

[C block diagrams and descriptions "'10
Adjustment procedures II-euuhevcooaoc uuuuuuuuuuuuuuuuu 18
Printed circuit board View ----------- -"""""21

Pc board-parts list '-"'
Schematic diagra-
Block diagram
Packing View -

NOTE ON COMPACT DISC

0 Holding Compact Discs

Hold Compact Discs by the edges so that you do not touch
the surface of disc. Remember that the side of the disc with
the rainbow" reflection is the side containing the audio
information.

Do not attach tape or paper to the label side of the disc
and always be careful not to leave fingerprints on the side
that is playedi

. Storing Compact Discs

Store Compact Discs in a location protected from direct
sunlight, high heat and humidity and extremely high
and low temperatures. Discs should never be left in the
trunk or interior of an automobile in the sun since the
temperature can become very high in such a closed environ-
ment.

Always store Compact Discs in the holders in which they
were sold. Never leave a disc in the players disc holder for
a long period of time,

Not this wav

SERVICE PROCEDURES

1. Safety-check out

After correcting the original service problem, perform the
following safety check before releasing the set to the
customer:

Connect the insulating~resistance tester between the plug
of power supply cable and chassis.

Specifications: more than lOMohm at 500V.

2. Voltage selector (back panel)

Worldwide models are equipped with a voltage selector to
conform with local power supplies. Be sure to set this selector
to match the voltage of the power supply in your area before
turning the power switch on. Voltage is changed by turning
the voltage selector with a screwdriver or similar instrument
to the HOV, 120V. 220V or 240V position. Confirm that the
selector has been set to the correct position before turning
the power switch on. If there is no voltage selector switch on
the unit you have purchased. it can only he used in areas
where the power supply voltage is the same as that of the unit.

at AC 110V

at AC 120V at AC 220V at AC 240V

0 Cleaning Compact Discs

Before playing a disc wipe off the playing surface with a
soft cloth to remove dust and other soil. Wipe the surface
in straight lines from the center of the disc outward, not
in a circular motion as you would with a phonograph
record.

Do not use benzene, chemical cleansers or phonograph
record cleaning solutions to clean Compact Discs. Also
avoid static electrictty prevention solutions since they can
damage the surface of Compact Discs.

Problems Caused by Dew

Dew can form inside a Compact player when it is brought
from a cold environment into a warm room, when a room
is rapidly heated and if a player is left in a humid environ-
ment

This dew can prevent the laser pickup from reading the
data contained in the pits in the disc surface. If the player
does not operate properly because of dew, remove the disc
and leave the players power switch on for about one
hour to remove all moisture.