Pioneer A-7 - User Manual

ORDER NO.
ART-597-0
NON SWITCHING AMP
STEREO AMPLIFIER
A-7
MODEL A-7 COMES IN SIX VERSIONS DISTINGUISHED AS FOLLOWS:
Type Voltage Remarks |
HE 220V and 240V (Switchable) Europe model
aaa 3
HB 220V and 240V (Switchable) U.K. model |
KU 120V only U.S.A. modei
=. =
120V only
Canada model
110V, 120V, 220V and 240V (Switchable) U.S. military modet
S 110V, 120V, 220V and 240V (Switchable) General export model |
This service manual is applicable to the HE and HB types. When repairing the KU, KC, S/G and S types,
please see the additional service manual.
Ce
manuel
d’instruction
se
refére
au
mode
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réglage,
en
frangais.
Este manual de servicio trata del método de ajuste escrito en espanol.
CONTENTS
1<, SPECIFICATIONS 24.¢ sn ins ad sensi wedsn 2 8. ELECTRICAL PARTS LIST............--- oe
2. FRONTPANEL FACILITIES.............. 3 9. SCHEMATIC DIAGRAM..............0.. 25
S.. iPARTS LOCATION, és. So canatpaeneeadeyers 6 10; PACKING’ s.cciqg an cuniarny are aaa ae 32
4. CIRCUIT DESCRIPTIONS................ 8 11; ADJUSTMENTS ¢ 05 edulis Uae ed eerie as 33
5. BLOCK DIAGRAM............-5+++-555 9 REGEAGE a3 anor eacsltee y base ad inten etned 34
6. EXPLODED VIEWS ..............--000-5 1 PIUSTES coho vic above Goma hteautecdlvean®, x2 35
7. P.C. BOARDS CONNECTION DIAGRAM...... 17
PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, Meguro-ku. Tokyo 153, Japan
U.S. PIONEER ELECTRONICS CORPORATION &5 Oxford Drive. Moonachie, New Jersey 07074, USA.
PIONEER ELECTRONIC (EUROPE) N.V. Luithagen-Haven S, 2030 Antwerp, Belgium
PIONEER ELECTRONICS AUSTRALIA PTY. LTD. 178-184 Boundary Road, Braeside, Victoria 3195, Australia
YU
©
DEC.
1980
Printed
in
Japan

Summary

1. Specifications

Amplifier Section

Details audio output power, distortion, frequency response, and sensitivity of the amplifier.

Miscellaneous

Lists power requirements, consumption, dimensions, and weight of the unit.

2. Front Panel Facilities

Power and Indicator Controls

Explains the power switch operation and associated indicators like protection and muting.

Tone Controls

Describes the operation of the Treble and Bass controls for adjusting the sound frequency range.

Input Source Selection

Details how to select different audio input sources using the Function Switches.

Volume and Headphone Output

Explains the Volume Control and the Headphone Jack for listening privately.

3. Parts Location

Front Panel View

Illustrates the location of components visible on the front panel.

Front View with Front Panel Removed

Shows component placement when the front panel is detached.

Top View

Diagram showing the layout of internal components when viewed from the top.

Bottom View

Diagram illustrating the placement of internal components from the bottom view.

Rear Panel View

Identifies components and connectors located on the rear panel.

4. Circuit Descriptions

4. PC Board Layouts

EQ Assembly Layout

Shows the printed circuit board layout for the Equalizer assembly.

Power Amplifier Assembly Layout

Details the printed circuit board layout for the Power Amplifier assembly.

Switch Assembly Layout

Illustrates the printed circuit board layout for the Switch assembly.

Protection Assembly Layout

Displays the printed circuit board layout for the Protection assembly.

5. Schematic Diagram

5. Block Diagram

6. Exploded Views

Exterior Components

Visual representation of the unit's exterior parts and their assembly.

7. P.C. Boards Connection Diagram

8. Electrical Parts List

10. Packing

11. Adjustments

Idle Current Adjustment

Procedure to adjust idle current for transistors Q1-Q4 using VR1 and VR2.

Power Indicator Adjustment

Steps to adjust VR101 and VR102 to properly light the power indicator LEDs.

Pioneer A-7 Specifications

General

Brand	Pioneer
Model	A-7
Category	Amplifier
Language	English