Onkyo A-8870

ONKY-00296
Ref. No. 3404
ONKYO.
SERVICE
MANUAL
integrated Stereo Amplifier
MODEL A-8870
Black and silver models
SAFETY-RELATED
COMPONENT
WARNING!!
TAB
LE
O
F
CONTE
NTS
COMPONENTS IDENTIFIED BY MARK A ON THE
SCHEMATIC DIAGRAM AND IN THEPARTS LIST ARE CRITI-
Specifications is .05 6 h35. 5 oe ees aise oes Saas See! ESS 2
CALFOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE Precautions: i.cccc standin aset add tol cage Oia awowe ee eal Z
THESE COMPONENTS WITH ONKYO PARTS WHOSE PARTS Adjustment procedures ....... 0.0 cece cece eee eee cee 3
NUMBERS APPEAR AS SHOWN IN THIS MANUAL. IC block diagram: a... ao dies Me EAS. Kee a ete TS 4
MAKE LEAKAGE-CURRENT OR RESISTANCE MEASURE- Block diagram ........ ccc ccc ences etna ence ten enenes 7
MENTS TO DETERMINE THAT EXPOSED PARTS ARE AC- Chassis exploded view 1.0.0... ccc cece cece eee eee re tees 9
CEPTABLY INSULATED FROM THE SUPPLY CIRCUIT Printed circuit board parts list .. 0.0... 0. ccc eee eee 12
BEFORE RETURNING THE APPLIANCE TO THE CUS- Printed circuit board View 2... 6. ec eee eee 16
TOMER. Schematic diagram 2... 600s cscs eee e ec eer beeen neeee 21
Packing part list isis 5 de aeeaie wget s bere agecdiaes aucieie O44 Ba wien steyy 24
Front panel facilities 0.0... cece cece ee eee eee nets 25
System CONNECTIONS ©... ee eee nets 25
ONKYO
AUDIO COMPONENTS

Onkyo A-8870 Specifications

General

Frequency Response	5Hz-100kHz (+1dB, -3dB)
Power Output	80 W + 80 W (8 ohms, 20Hz-20kHz, THD 0.008%)
Total Harmonic Distortion	0.008%
Damping Factor	60 (8 ohms, 1kHz)
Input Sensitivity	2.5 mV (MM)
Speaker Load Impedance	4 ohms - 16 ohms
Dimensions	435 x 149 x 431 mm
Weight	21.5kg

Summary

SAFETY-RELATED COMPONENT WARNING!

SPECIFICATIONS

PRECAUTIONS

Replacing the fuses

Guidance on replacing fuses with identical types and ratings to prevent fire risk.

ADJUSTMENT PROCEDURES

Preparations

Instructions for workbench setup, unit configuration, and pre-adjustment checks.

Idling current adjustment

Procedure to adjust voltage for idling current on the NAAF-4209 circuit board.

Check of operation of protection circuitry

Steps to verify the protection relay, DC detection, and servo circuitry functions.

IC BLOCK DIAGRAM

BLOCK DIAGRAM

CHASSIS-EXPLODED VIEW

CHASSIS EXPLODED VIEW PARTS LIST

PRINTED CIRCUIT BOARD PARTS LIST

PRINTED CIRCUIT BOARD VIEW FROM BOTTOM SIDE

SCHEMATIC DIAGRAM

PARTS LIST OF PACKING

FRONT PANEL FACILITIES

SYSTEM CONNECTIONS