Onkyo DX 2800 Service Manual

Page 1

DX-2800

REF. NO. 3372

ONKYO® SERVICE MANUAL

COMPACT DISC PLAYER
MODEL DX-2800

Black model

BUDN, BUD

120V AC, 60 HZ

BUG

220V AC, SOHZ

BUW

120/220V AC, 50/60Hz

BUQA, BUQB

240V AC, 50 Hz

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 PARTS 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 1
Illlllll cumuumsn

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(W X H X D):

Weight:

Optical non-contact

About 500 ~200r,prmr

(constant linear velocity)

12 ~1.4m/s

Cross interleave rcadsolomon code
1 bit IWM

352r8kHz(8 times oversampling)
2(Stereo)

2H2 ~20kHz

0.0035%(at lklvlz)

98dB

106dB

98dB(at 1kHz)

Below threshold of measurability
16 watts

2 voIts r.m.s.

435 X118 X312 mm

1771/8" X4-5/8><12-1/4"

5.1kg. [1.2Ibs.

Specifications are subject to change without notice.

_.1_

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lX-2800

TABLE OF CONTENTS

Specifications
Service procedures ....................
Caution on replacement of pickup
Protection of eyes from laser beam during servicingc
Laser warning label ..
Mechanism-exploded view
Disassembling/Attachment procedure.
Exploded view ..
Parts list ..........
lC block diagrams and descriptions
Adjustment procedures
Printed circuit board views
Main circuit pc board
Display circuit pc board
Power supply pc board
Printed circuit board parts list
Main circuit pc board
Display circuit pc board
Power supply pc board
Block diagram
Packing View ..

SERVICE PROCEDURES

1. Voltage selector (rear 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 120V or 220V 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 be used in areas where
the power supply voltage is the same as that of the unit.

CAUTION ON REPLACEMENT OF PICKUP

The laser diode in the optical pickup block is so sensitive
to static electricity, surge current and etc. that the com-
ponents are liable to be broken down or its reliability
remarkably deteriorated.

PR ECAUTIONS

During repair. carefulley take the following precautions.
(The following precautions are included in the service

parts).

1. Ground for the work-desk.
Place a conductive sheet such as a sheet of copper
(with impedance lower than lOS'l) on the work-
desk and place the set on the conductive sheet so
that the chassis.

2. Grounding for the test equipment and tools.
Test equipments and tooling: should be grounded
in order that their ground level is the same the
ground of the power source.

3. Grounding for the human body.
Be sure to put on a wrist-strap for grounding whose
other end is grounded.
Be particularly careful when the workers wear
synthetic fiber clothes, or air is dry.

4. Select a soldering iron that permits no leakage and
have the tip of the iron wellgounded.

5. Do not check the laser diode terminal: with the
probe of a circuit tester or oscilloscope.

Page 9

IX-2800

MECHANISM EXPLODED VIEW

GUTTER SECTION
6-9025
(PART No 260447)

Page 13

X-2800

CHASSIS-EXPLODED VIEW