Onkyo DX 703 Service Manual

Page 1

DX-703
DX-705

REF.NO. 3422

ONKYOQ SERVICE MANUAL

COMPACT DISC PLAYER

MODEL DX-705

MODEL

Black and Silver models

DX-703

BIIMD,BIIMDN,BHMDC

120V AC, 60Hz

BIIMI,BHMPF, MP, MPF

230V AC, SOI'IZ

BI'IMW

I 20/220V AC, 50/60l Iz

BHMQA

240V AC,50HZ

SAFETY-RELATED COMPONENT WARNINGYI

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 flllMPllllfllls r

SPECIFICATIONS

Signal readout system:
Reading rotation:

Linear velocity:

Error correction system:
D/A converter:
Sampling frequency:
Number of channels:
Frequency response:
Total harmonic distortion:
Dynamic range:

Signal to noise ratio:
Channel separation:
Wow and Flutter:
Power consumption:
Output level:
Dimensions (WXHXD):

Weight:

Optical non~contact

About 500~200 r.p.m.

(constant linear velocity)
1.2~Ir4m/s

Cross interleave readsolomon code
1 bit PWM/Accu Pulse D/A converter
352.8kHz (8 times oversampling)

2 (Stereo)

5Hz~20kHz

0.004% (at IkHz)

96dB

100dB

90dB (at IkHz)

Below threshold of measurability
12 watts

2 volts r.m,sr

455x110x306mm
18"x4-3/8><12"

5.0kgt 1101bs.

Specifications are subject to change without notice

Page 2

DX~703
DX-705

TABLE OF CONTENTS

Specifications ......

Service procedures

Note on compact dts
Qution on replacement of optical pickup.
Protection of eyes from laserbeam during servrcing
Laser warning label ................

IC block diagrams and descriptions.
Packing vies-1....
Chassis exploded view
Panslist DX~703...

BX -705
Mechanism exploded view
Mechanism~parts list .......

mmbewww-

Removement of disc tra y ..

Adjustment procedures,
Primed cirtmit board View
Main circuit/Headphone pcb .............................................. 2 3
Display/Power supply/Tenninal p Cb .
Schematic diagram D X -705 ..........
DX-703 iiiiiiii
Primed circuit board~parts list
Block diagram ..............
Trouble shooting guide...

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 played.

O 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
along period of time.

Nor this way

SERVICE PROCEDURES

1. Safety-check out
After correcting the original service problemperform
the following safety check before releasing the set
to the customer:
Connect the insulating-resistance tester between the
plug of power supply cord and chassis.
SpecificationszMore than 10Mohm at 500V.

2. Voltage Selector (B ack panel)
Worldwide models are equipped with a voltage selector
to conform with local power supplies.Be sure to set
this switch to match the voltage of the power supply
in user's area before turning the power switch on.
Voltage is changed by sliding the groove in the switch
with a screw driver to the right or left.
Confirm that the switch has been moved all the way to
the right or left before turning the power switch on.

[-5]? [ID

- +-
220V N 120V ~ 220V ~ 120V N
at ACIZOV at ACZZOV

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 electricity 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 player's power switch on for about one
hour to remove all moisture.