Onkyo DX 788F Service Manual

Page 1

88

REF, NO, 3451

ONKYOQ SERVICE MANUAL

COMPACT DISC PLAYER
MODEL DX-788F

Black and Silver models

BUDN BUD 120v AC, 00 Hz

BU P ~ 2 mV/XE' séiiiifiw

BUW 120J220v AC. SO/oOHz

BUQA 1 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
Alllilll cuMPnuimsI

SPECIFICATIONS

Signal readout sysrcm;
Reading rotallon:

Liniar velocity:

Error correcrion system:
D/A converter:
Sampling frequency:
Number of channels:
Frequency response:

Tmal harmonic disrunion:

Dynamic Range:
Signal to noise ratio:
Channel separation:
Wow and Flulrcr:
Powcr consumption
Ouipui level:

Dimensions (WX H X D) :

Weight:

Optical nonrconmct

About 500~200r.p.m.

(constant liniar velocity)
l.2~l.4m/s

Cross interleave reedsolomon code
lbir PDMXZ Accu Pulse Quartz
351.8kHz (8 umcs oversampling)
2 (Stereo)

2Hz~20kHz

0.001570 (a1 IkHz)

IOOdB

IOZdB

102w (at kHz)

Below threshold of measurability
34 walls

2 volts r,m.s,

455x130x364mm

I7-15/16"X 5»I/8"X ILS/lfi"
8,9kg. 19.6le

Specifications are subjcc! r0 change without noricc,

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IX-788F

TABLE OF CONTENTS

Specifications ........................................................................ 1
Service procedures .................................................................. 2
Laser warning label ................................................................. 3
Exploded view ..................................................................... 4

Panslist .......................
Mechanism-Exploded view
Partslist...

Caution on replacement of pickup .............

Protection of eyes from laser beam during servicing ............................ 8
1C block diagrams and descriptions ............................................... 9
Packing view ........................................................................ 19
Adjustment procedures ............................................................ 20
Printed circuit board views from bottom side .................................. 23
Schematic diagram ................................................................. 25

25
27

RF and power supply section ......
Audiosection,

Block diagram.

Printed circuit boardparts list.

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

my

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
Mfg? 1.5V R6
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 IOMohm 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
one 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 luring 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.