Onkyo DX 300 Service Manual

Page 1

ONKYO SERVICE MANUAL

COMPACT DISC PLAYER
MODEL DX-3OO

UDN, UD

IIZOV AC, 6on

UGV, UG

220V AC, SOHZ

UW

l20/220V AC, 50/60Hz

SAFETY-RELATED COMPONENT WARNINGII

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
MEASUREMENTS TO DETERMINE THAT
EXPOSED PARTS ARE ACCEPTABLY
INSULATED FROM THE SUPPLY CIRCUIT
BEFORE RETURNING THE APPLIANCE TO THE
CUSTOMER.

ONKYO
ltlllllll BUMPIININIS

DX-3OO

SERIAL NO. 3168

SPECIFICATIONS

Compact Discs

Playing Limo:

Disc diameter:

Track pitch:

Linear tracking speed
(constant):

Revolutions per minute:

Disc thickness:

Pickup:

Channels:

Sampling frequency:

Quantization bits:

Audio

Frequency response:
SignaLm-noise ratio:
Dynamic range:

Channel separation:

Total harmonic distortion:
Wow and flutter.

Output level:

Output impedance:

Headphone load impedance:

75 minutes max.
12 cm
1.6 [1111

About 1.3 m/sec.
About 200 to 500
L2 mm
Semi-conductor
Two

44.1 kHz

16 bits linear

2720.000 Hz

95 dB

95 dB

90 dB

0.003%

Quartz accuracy
Line: 2V rms
Headphones: 30 mW
560 ohms

8732 ohms

Page 2

IX-300

Functions

1. Displays: track number, index number, playing
time of tracks and remaining playing time of disc,
memory track number

Pickup position indicator

Index search function

Forward and reverse jump function

Memory play function

Fast forward and reverse

Pause function

sshwerww

General

Power supply:
120/220V SO/IIOHZ

Power consumption: 40 watts

Dimensions(W X H x D): 450 X115 X 380 mm

Weight: 97 kg

AC120V/60Hz, ZZOV/SOHZ,

PROTECTION OF EYES FROM LASER BEAM

DURING SERVICING

This set employs a laser. Therefore, be sure to follow
carefully the instructions below when servicing.

WARNINGI!

WHEN SERVICING, DO NOT APPROACH THE
LASER EXIT WITH THE EYE TOO CLOSELY, IN
CASE IT IS NECESSARY TO CONFIRM LASER
BEAM RMMISION, BE SURE TO OBSERVE FROM
A DISTANCE OF MORE THAN 30cm FROM THE
SURFACE OF THE OBJECTIVE LENS ON THE
OPTICAL PICK-UP BLOCK.

LASER WARNING LABELS

The labels shown below are affixed.
1. DHHS Protective Housing Label

DANGER
umsinu um m-
mm m m.
mm um um-
sun: in m.

0 See figure 1 on next page for location of label.
2. Certification label .............. (UD model only)

PRODUCT IS CERTIFIED BY THE MANUFAC-
TURER TO COMPLY WITH DHHS RULES 21
CFR SUBCHAPTER J APPLICABLE AT THE

DATE OF MANUFACTURE.

MMNHKHUMWI

0 See figure 2 on next page for location of label.

Laser Diode Properties

0 Material: GaAs

0 Wavelength: 780nm

0 Emission Duration: continuous

0 Laser output: max. 0.3mW*

*This output is the value measured at a

distance about 1.8mm from the objective
lens surface on the Optical Pick-up Block.

3. Class 1 label .................. (UG model only)

CLASS1LASER

PRODUCT"

0 See figure 3 on next page for location of label.

Page 4

DX7300

TABLE OF CONTENTS

Specifications .................................. 1
Protection of eyes from laser

beam during servicing ............................ 2
Laser warning labels ............................ 2
Precautions ...................................... 4
Precautions in handling the optical pick-up block , 5
Service note .................................... 6
Disassembly .................................... 8
Stringing diagram .............................. 10
Lubrication ................ 11
IC block diagram ......................... 12
Block diagram .................................. 18
Front panel facilities

and operations .................................. 22
Each section waveform .................. :24
Notes on compact disc ..................... 27
Component location ...................... 28
Packing view .................................. 29
Adjustment procedures

Mechanism adjustment .......................... 30
Electrical adjustment .......................... 32

PRECAUTIONS

l, Replacing the fuses
For continued protection against fire hazard, replace
only with same type and same rating fuse.

Remove the bottom board.

Circuit no. Rating P.N Model
F801 1A(STA6) 252045 D(120V)
W(120/ 220V)
500mA G(220V)
F802 (SE-EAWK) 252063 W(120/220V)

2. Safety-check outtD model)

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 nickel screw.
Specifications: more than lOMohm

Exploded view

Loading case .................................. 35
Chassis ...................................... 39
Parts list
Loading case .................................. 37
Chassis ........................................ 38
Schematic diagram
Optical pick-up control .......................... 41
Signal processinthZOV model) .................. 43
Signal processing(120V model) .................. 47
Display/Digital circuit ....................... 51
Servo/Micro computer control .................. 55
Printed circuit board view
Optical pick-up control .......................... 41
Signal processing .............................. 45
Display/Digital circuit ..................... 49
Servo/Micro computer control , ............ 53
Printed circuit board parts list
Optical pick»up control llllllllllllllllllllllllll 42
Signal processing .............................. 42
Display/Digital circuit ................. 50
Servo/computer control ........................ 57

F802(G/W)

F8OHD) Radiator

Back pane|

Bracket nob
(Fig. 4) (center bracket)

Nickel screw Back panel

(Fig. 5)