Onkyo A-7 Service Manual

A-/
ONKYO. SERVICE MANUAL
INTEGRATED STEREO AMPLIFIER
Model A-/
SPECIFICATIONS
Model A-7 Integrated Stereo Amplifier
Power Supply Rating
Controls
Outputs
Inputs
Dimensions
Weight
AC 120 Volts 60 Hz (USA Model)
AC 110V/120V/220V/240V
50Hz/60Hz (Universal Model)
POWER
SPEAKERS (OFF, A, B, A+B)
SELECTOR (PHONO 1, PHONO 2,
TUNER, AUX)
TAPE MONITOR (TAPE 1, SOURCE,
TAPE 2)
Total Harnomic
Distortion (AUX)
IM Distortion (AUX)
(70Hz : 7kHz= 4:1)
Frequency Response
Tilt
Signal to Noise Ratio
Damping Factor
Rated input
TAPE DUBBING (TAPE 2-1, OFF, TAPE Input Impedance
1-2)
VOLUME, BALANCE, BASS, TREBLE,
TURN OVER SWITCH
BASS (125Hz, DEFEAT, 400Hz)
TREBLE (2kHz, DEFEAT, 8kHz)
MUTING, LOUDNESS,
MODE, HIGH FILTER,
SUB-SONIC FILTER
SPEAKER A & B, PHONES
TAPE REC 1 & 2,
PRE OUT
PHONO 1 & 2
TUNER
AUX
TAPE PLAY 1 & 2
MAIN IN
17t2''(W) x 64%4''(H) x 15"°(D)
444 x 159 x 380 mm
29.7 Ibs. 13.5 kg.
Power Amplifier Section
Power Output
(through AUX inputs)
70 watts per channel, min. RMS, at 4
Ohms both channels driven, from 20 Hz to
20 kHz, with no more than 0.1% total
harmonic distortion.
65 watts per channel, min. RMS, at 8
ohms both channels driven, from 20 Hz to
20 kHz, with no more than 0.1% total
harmonic distortion.
75 watts per channel, min. RMS, at 4
ohms both channels driven, 1 kHz, 0.1%
total harmonic distortion.
68 watts per channel, min. RMS, at 8
ohms both channels driven, | kHz, 0.1%
total harmonic distortion.
Load Impedance
Preamplifier Section
Input Sensitivity &
Impedance
Total Harmonic
Distortion
IM Distortion
(70Hz : 7kKHz = 4:1)
Frequency Response
Phono Overload
Signal to Noise Ratio
Output Voltage
Output Impedance
Tone Control
Turnover Frequency
Filters
Muting
Loundness
(—40 dB)
BASS
TREBLE
SUBSONIC
HIGH
0.1% at rated power
0.08% at 1 watt output
0.1% at rated power
0.08% at 1 watt output
2-80,000 Hz (+1 dB)
better than 5% at 50 Hz
110 dB (IHF A NETWORK)
50 at 8 ohms
1.5 volts
100 k-ohms
4—16 ohms
PHONO 1 & 2: 2.5mV, 50 k-ohms
TUNER: 150mV, 50 k-ohms
AUX: 150mV, 50 k-ohms
TAPE PLAY 1 & 2: 150mV, 50 k-ohms
0.05% at rated output
0.08% at rated output
PHONO: +0.2 dB at 30—15,000 Hz
AUX: +0, —1 dB at 10—50,000 Hz
230mV RMS. at 1 kHz, 0.1% THD.
PHONO: 80 dB (THF A NETWORK)
AUX: 90 dB (IHF A NETWORK)
1.5 volts, max 15 volts
2.7 k-ohms
+10 dB at 100 Hz (turnover at 400 Hz)
+10 dB at 10 kHz (turnover at 2 kHz)
BASS: 400 Hz, 125 Hz
TREBLE: 2 kHz, 8 kHz
10 Hz (6 dB/oct.)
5 kHz (6 dB/oct.)
—20dB .
+5 dB at'100 Hz
+5 dB at 10 kHz
Specifications are subject to change without notice.
ONKYO.
AUDIO COMPONENTS

Onkyo A-7 Specifications

General

Brand	Onkyo
Model	A-7
Category	Amplifier
Language	English

Summary

Specifications

General Unit Specifications

Details power rating, controls, input/output terminals, dimensions, and weight of the amplifier.

Power Amplifier Performance

Covers power output, distortion, frequency response, and impedance for the power amplifier.

Preamplifier Performance

Outlines preamp input sensitivity, impedance, distortion, frequency response, and tone control capabilities.

Service Procedures

Protective Circuit Operation Check

Verifies the protective circuit's functionality by applying a signal and adjusting volume.

Power Amplifier Circuit Board Inspection

Instructions for accessing and inspecting components on the power amplifier circuit board.

Component Location

Main Amplifier Alignment Procedures

Idling Current Adjustment

Steps to adjust the idling current for both amplifier channels using a voltmeter.

Center Voltage Adjustment

Steps to adjust the center voltage for both amplifier channels using a voltmeter.

Schematic Diagram

Packing Procedures