Onkyo A 803 Service Manual

Page 1

RetNo. 3396

ONKYO@ SERVICE MANUAL

Integrated Stereo Amplifier
MODEL A-803

Black and Silver models

UD 120V AC, 60Hz

UP 230V AC, 50Hz

UW lZOV/ZZOV AC, 50Hz/60Hz

SAF ETY-RELAT ED 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
MEASUREMENTS TO DETERMINE THAT
EXPOSED PARTS ARE ACCEPTABLY INSU-
LATED FROM THE SUPPLY CIRCUIT BEFORE
RETURNING THE APPLIANCE TO THE CUS-
TOMER.

TABLE OF CONTENTS

Specifications ......................................... 2
Precautions --------------
Adjustment procedures ------------------------------- , i 3
1c block diagram ..................................... 4
Chassis exploded view -----
From panel facilities --------------------------------- 11
System Connections ................................... 1 1
Printed Circuit board parts list

Block diagram ....................................... [5
Schematic diagram ................................... 17
Parts list of packing ................................... 25

ONKYO
4 Antlltl chPIINENIs

-1-

Page 2

803
SPECIFICATIONS

Power Output: 60 watts per channel, min HMS, at
8 ohms, both channels driven from
20 Hz to 20 kHz, with no more than
0.06% THD.
2 x 100 watts at 4 ohms, 1 kHz(DlN)
2 x 70 watts at 8 ohms, 1 kHz(DIN)

Total Harmonic Distortion 0.06% at rated power

lM Distortion 0.06% at rated power

Damping Factor: 40 at 8 ohms

Frequencey and Response: 15-30000 Hz tl dB

Input Sensitivity/Impedance: Phono (MM): 2.5 mV/50 kohms
Phono (MC): 350 pV/ZZO ohms
Tuner/CD/AUX, Video: 150 mV/5O kohms
Source Direct: 150 mV/5O kohms
Tape/Plav: 150 mV/50 kohms

Output Sensitivity/Impedance: Tape/Rec: 150 mV/3 kohms

(phone)

Phono Overload: 135 mV RMS at 1 kHz, 0.1% THD (MM) (REC)

Bass Control: :10 dB at 100 Hz

Treble Control: :10 dB at 10,000 Hz '

Selective Tone Control: 115 dB at 50 Hz/ie dB at to kHz

Signal to Noise Ratio (lHF-A): Phono (MM): 80 dB (5 mV input)
Phono (MC): 70 dB (0.5 mV input)
Source Direct (CD): 102 dB

General

Power Supply: U.S.A 8. Canadian models: AC 120V, 60Hz
European models
(except U. K.): AC 230V, 50Hz
U.K. 8t Australian models: AC 240V, 50H:
Worldwide models: AC 120 and 220V

switchable, 50/60Hz
Dimensions (W) x (H) x (D): 455 x l20 x 330 mm
17-15/16" x 4-3/4" x 13"

Weight: 7.3 kg. 16.1 lbs.
Remote Control Transmitter RC-ZOOS/ZOSS
Transmitter: Infrared
Signal range: Approx. 5 meters. 16"
Power supply: Two AA~ batteries (1.5 V x 2)
Dimensions (W X H x D): 64 x 18 x 176 mm
2-1/2 x11/16" x 645/16"
Weight: 130 grams. 4.6 oz. (including batteries)

PRECAUTIONS

1. Replacing the fuses

Specifications and leatures are subject to
change without notice.

For continued protection against risk fire, replace only with same type and same rating fuse.

CIRCUIT NO. PART NO. DESCRIPTION

F90] 252050 5A ST-6, Primary fuse (120V. 1 2(lV/220V model)

F9t)l 252075 2.5AVSE-EAK. Primary fuse (230V model)

F902 252075 2.5A-SE7EAK. Primary fuse (230V,120V/220V model)

2. Insulation resistance mesuremenl (Only U.S.A. model)

Connect the insulating-resistance tester between the plug of power supply cable and the terminal GND on the back panel.

Specifications: More than IO M!) at 500V.

3. Voltage selector (rear panel)

Worldwide models are equipped with a voltage selector to conform with local power supplies. Be sure to set this switch to match the voltage
of the power supply in your area before turning the power switch on. Voltage is changed by sliding the groove in the switch with a screwdriver
to the right or left. Confirm that the switch has been moved all the way to the right or left before turning the power switch on. Models without
a voltage selector can only be used in areas where the power supply is the same as that of the unit.

[III]

Cl]:

220V ~ 120V ~
at AC 120V

220V ~ 120V ~

at AC 220V