Onkyo DXC 370 Service Manual

Page 1

DX-CB7O

Ref. No. 3617

()INTII'IY'CMo SERVICE MANUAL

COMPACT DISC CHANGER
MODEL DX-C370

Black and Sllver models

BMD 120v AC, son:
BMP/BMPA/SMP 2_30v AC, 5on ..
BMWT 120/2220sz AC, 50/601-12

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 COM-
PONENTS WITH ONKYO PARTS WHOSE PARTS
NUMBERS APPEAR AS SHOWN IN THIS MANUAL.

MAKE LEAKAGE-CURRENT 0R RESISTANCE
MEASUREMENTS TO DETERMINE THAT
EXPOSED PARTS ARE ACCEPTABLY IN-
SULATED FROM THE SUPPLY CIRCUIT BEFORE
RETURNING THE APPLIANCE TO THE
CUSTOMER.

ONKYO.
IIIIIIII liflIlPIIIIIIS

, SPECIFICATIONS

Signal readout system:
Reading rotation:

Linear velocity:

Error correction system:
D/A convener:
Sampling frequency:
Number of channels:
Frequency response:

Total harmonic distortion:

Dynamic range:
Signal to noise ratio:
Channel separation:
Wow and Flutter:
Output level:

Power consumption:
Power supply:

Dimensions (W x H x D):

Weight

Optical non-contact

About 500 - 200 rpm.

(constant linear velocity)

12 - 1.4 mls

Cross Interleave Reed-Solomon code
1 bit PWM/ACCUPULSE

352.8 kHz (8 times oversampling)
2 (stereo)

5 Hz - 20 kHz

0.005% (at l kHz)

96 dB

92 dB

92 dB (at 1 kHz)

Below threshold of measurability
2 volts r.m.s.

10 walls

120 V, 60 Hz

230V, 50 Hz

220230VIIZOV switchable. 50/60 Hz
435x131x 433mm

(17-11'8" x 5-3/16 x 17-1/16")
6.9 kg (15.2 lbs.)

Specifications and features are subject to change without noIice.

Page 2

DX-C37O

TABLE OF CONTENTS SERVICE PROCEDURES

Specifications 1 1. S afe ty-ch eck out
Caution on replacement of optical pick-up 3 After correcting the angina] service problemperfonn
Protection of eyes from laser beam during servicing 3 the following safety check before releasing the set
Laser warning label 3 m the customer.
IC block diagrams and descriptions 4 Connect the insulating-resistance tester between the
Microprocessor connection diagram 8 plug of power supply cord and chmis.
Microprocessor terminal description . 9 Specificationst titan lOMohm at 500V.
Care should be taken With the optical pickup 10 2 . V oltage Selector (B ack panel)
I rouble shooting 11 _ . _
Initializing operation 13 WMM "m are equipped With a voltage W
Error message displayed in heat-running mode 14 0 nonfat: "m local WW SWB'B sure to I
Block diagram 15 this with to mach the voltage of the power supply
Chassis exploded view 17 in M3 3 M0 turning "'9 PW switch 0"-
Parts list 19 Voltage is changed by sliding the groove in the switch
Pick-up drive unit view 20 with a screw driver to the right or left.
Printed circuit board-parts list 21 Confm that the switch has been moved all the way to
Printed circuit board view from bottom side 23 the right or left before turning the power switch on.
Schematic diagram 27
Adjustment procedures 29 ED [ID
Packin View 30
g <- I-> <- I->
220-230v ~ 120v ~ zzozsov ~ 120v ~
at ACl20V at AC220 ~ 230v

CAUTION ON REPLACEMENT OF OPTICAL PICK UP

The laser diode in the optical pickup block is so During repairmfulley take the following precautions.
sensitive to static electricitysurge current and etc. (The following precautions we included in the service
that the components are liable to be broken down parts.)

or its reliability remarkably deteriorated

PRECAUTIONS

LGround for the work-desk. 3.Grounding for the human body.
Plaeeacondmtivesheetsuchnasheetofeopper Besuretopntonawrist-snapforgromdingwhuse
(with inpedsnee lower than lOMfl) on the work- other end is grounded.
deskandplaeethesetonthecenductivesheetso Bepaniarlarlyeorefulwhentheworkerswear
that the chassis. synthetic fiber clothes. or air is dry.

2.6mnding for the test equipment and tools. 4 .Select a soldering iron that permits no leakage and
Testequipmenuandtoolinpshouldbegrounded havethetipot'theironwell-gronnded.
inorderthattheirgroundlevelisthesamethe 5.Donotcheckthelaserdiodewrminalswhhthe
ground of the power source. probe of a circuit tester or oscilloscope.