Onkyo DX 7911 Service Manual

Page 1

DX-791 1

Ref. No. 3532
ONKYOS SERVICE MANUAL
COMPACT DISC PLAYER
Black model/Silver model/Golden model
UD 120v Ac, 60Hz
UP 230v AC. SOHZ
UW l20/220V AC. 50/60Hz
SAFETY-RELATED COMPONENT WARNINGS! SPECIFICATION
COMPONENTS IDENTIFIED BY MARK A ON THE Comm D. We, Mm my
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SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE R'fa'gfin'gefogmm Aggfjsg'j 2; rim
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK LY a. do (1638:3211 3m velocnw
REPLACE THESE COMPONENTS WITH ONKYO PARTS Error can-action sysmm: Cross mum newsman, code
D/A converter 1 hi: PWM ACCUPULSE D/A
WHOSE PARTS NUMBERS APPEAR AS SHOWN IN CONVERTER
S I' f 1: 352.3 kH (E' I1 7' 1
THIS MANUAL. amp mg requencv oversampllmgf [tn-rm
Numbcr of channcls 2 (stcren)
Frequency response: 2 H7 , 20 kHz
MAKE LEAKAGE-CURRENT 0R RESISTANCE MEA- 7'35? d-xmmon: 0.0025 [In
{El Z
SUREMENTS TO DETERMINE THAT EXPOSED PARTS mam We. _ 110 an
ARE ACCEPTABLY INSULATED FROM THE SUPPLY imam? 1",: 2:
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CIRCUIT BEFORE RETURNING THE APPLIANCE 1 O \ilow an: Flutter: Below Ihreshold of measumbilny
THE CUSTOMER, Oulpul 1:ch 2 voks r.m.s.
Headphone jack. 1
Opumum load impedance
8 to 200 ohms
Power consumptinn, 26 watts
Power supply raung' European and Australian models:
ONKYO
USA and Canadian models:
AC [20 V, 60 Hz

Worldwlde model:
AC 120 V and AC 220-230V
swilchable, 50/60 H1
DImcnsIonS (W x H x D): 435 x I3] X 365 mm

(Ill/fl" X 5-3116" X 143/8")
Welghl 10.5 kg 23.! lbs.

Specificauons and cxlemal appearance are subjecI lo change
withoul ncIice because of producl improvements.

Page 2

DX-7911

TABLE OF CONTENTS

Specification 1
Service procedures 2
Laser warning label 3
Chassis exploded view 4
Chassis exploded view parts list 5
Mechanism exploded view 6
Mechanism exploded view parts list 7
Microprocessor connection diagram 8
Microprocessor terminal description 9
IC block diagram and description 10»15
Caution on replacement of pickup 16
Adjustment procedure 17
Block diagram 18
Parts list 19-20
Printed circuit board view from bottom side 21-24
Schematic diagram 25-26
Packing view 27

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.

i. 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

if

LOCK
- 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 Sire
AA
M351} l 5v R6
UMJ

3. Safety check out

After correcting the original service problem, perform
the following safety check before releasing the set to
the customer:

Connect the insulatingresistance tester between the
plug of power supply cable and chassis.

Specifications: more than lUMohm 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 he used in areas
where the power supply voltage is the same as that of
the unit.