Onkyo DX 3800 Service Manual

Page 1

REF. NO.3379

ONKYO® SERVICE MANUAL

COMPACT DISC PLAYER
MODEL DX-3800

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Ex mu

M, , BlackmiQme - . ~___.1
BUDN, BUD 120v AC, 60 Hz
BUG 220v AC, sonz
BUW 120/220v AC, 50/60Hz
BUQA, BUQB 240v AC, 50 Hz
SAFETY-RELATED COMPONENT WARNINGH SPECIHCATIONS

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 LEAKAGECURRENT OR RESISTANCE MEA»
SUREMENTS TO DETERMINE THAT EXPOSED PARTS
ARE ACCEPTABLY INSULATED FROM THE SUPPLY
CIRCUIT BEFORE RETURNING THE APPLIANCE TO
THE CUSTOMER.

ONKYO
IIIIIIIII IIIIMPIIIIIIIIS _

Signal readout system:
Reading rotation:

Liniar 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 500~200r,p.rn.

(constant Iiniar velocity)

1 2'- 1 Arm/s

Cross interleave readsolomon code
lbit PWMXZ Accu Pulse Quartz Syste
352.8kHz (8 times oversampling)

2 (Stereo)

2Hz~20kHz

0.0025% (at 1kHz)

lOOdB

1 1MB

103dB (at kHz)

Below threshold of measurability
25 watts

2 volts r.m.s,

435x132><358mm

17-1/8"X5»3/8" X 14-1/8

8.1kg, 17.8le

Specifications are subject to change without notice

1-

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TABLE OF CONTENTS

Specifications. . .
Service procedures.
Laser warning label .
Chassis-exploded View .
Parts list .
Mechanismexploded View.
Parts list ..........................
Caution on replacement of pickup ..
Protection of eyes from laser beam during servicing
IC block diagrams and descriptions ...........
Adjustment procedures .
Pc board views .............

DAC and audio circuit pc board .

Digital circuit pc board ..............

Other pc boards...
Pc board-parts list
Block diagram
Packing View .....

SBEBBe'm'm'q'ains'wiup

SERVICE PROCEDURES

1. How to Release the Transport Lock

To protect the optical assembly including the laser pickup

from vibration related damage during shipping, this unit is

equipped with a transport lock lever located on the base.

1. Loosen the screw with Phillips screwdriver.

2. Move the lock lever in the direction opposite that shown
by the arrow. Move the lever up to the position where
it can move no farther, and then remove the lever.

I Tighten the screw to secure the lock lever.
O For shipping, restore the lock lever to its position in
the direction of the arrow. then tighten down the
screw to secure the lock lever in that position.

Phillips screwdriver

by

Cir
Lock lever

2. Use of batteries

0 The remote control transmitter is powered by two
batteries. Before using this unit for the first time,
insert the two batteries (included).

0 Average battery life is about one year. This period
may be shorter depending on the frequency of use
and environment (temperature and humidity) in
which the remote control transmitter is used.

0 If the remote control transmitter does not operate
even though front panel controls function normally,
the batteries should be replaced. Use only listed in
the following chart.

Type Voltage Size
AA
MT? 1.5V H6
35 UM«3

3. 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.

4. Voltage selector (rear panel)

Worldwide models are equipped with a voltage selec-
tor 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 turing 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.

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CAUTION ON REPLACEMENT OF PICKUP

The laser (Ode in the Optical PiCkuP block is so sensitive Barring repair, carefulley take the following precautions.
to static electricity, surge current and etc. that the com- (The following precautions are included in the service
ponents are liable to be broken down or its reliability parts).

remarkably deteriorated.

PRECAUTIONS

1. Ground for the work-desk. 3. Grounding for the human body.
Place a conductive sheet such as a sheet of copper Be sure to put on a wrist-strap for grounding whose
(with impedance lower than 1059) on the work- other end is grounded
desk and place the set on the conductive sheet so Be particularly careful when the workers wear
that the chassis, synthetic fiber clothes, or air is dry.

2. Grounding for the test equipment and tools. 4. Select a soldering iron that permits no leakage and
Test equipments and toolings should be grounded have the tip of the iron well-grounded.
in order that their ground level is the same the 5. Do not check the Iuer diode terminals with the
ground of the power source. probe of a circuit tester or oscilloscope.

LD TERMINALS

(Care should be taken with the optical pickup.)

The optical pickup is sensitive to static electricity, surge
currents, and other high electrical noise, and because
there is the possibility of damage to performance, in the
handling of the pickup, the utmost care must be taken,
particularly with regard to static electricity.

Mechanism assy removement

When remove the mechanism assy, first short the LD

terminals on the pc board and remove the mechanism

assy.

Optical pickup removement

1. When replacing the optical pickup, first short the LD
terminals and remove the connector. Also, when
attaching the new optical pickup, after attaching the
connector, unsolder the LD terminals.

2. Do not touch the optical pickup object lens with the
hands

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°i

Flake pc board on the pick up

PROTECTION OF EYES FROM LASER BEAM DURING SERVICING

This set employs a laser. Therefore, be sure to follow LueDlodeProperfiu
carefully the instructions below when servicing. Material GaAS/GaAlAs

WARNING" o Wavelength: 780nm
" 0 Emission Dirationzcontinuous
WHEN SERVICING, DO NOT APPROACH THE LASER 0 Laser output: maxi 0.5mW
EXIT WITH THE EYE T00 CLOSELY. IN CASE IT IS *This output is the value measured at a distance
NECESSARY TO CONFIRM LASER BEAM EMMISION. about 1.8mm from the objective lens surface
BE SURE TO OBSERVE FROM A DISTANCE OF MORE on the Optical Pick-up Block.

THAN 30cm FROM THE SURFACE OF THE OBJECTIVE
LENS ON THE OPTICAL PICKUP BLOCK.