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Amplifier
SPEC-4
Service manual
Pioneer SPEC-4 Service Manual
Stereo power amp
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Table of Contents
Model Spec 4 Comes in Two Versions Distinguished as Follows
Contents
Specifications
Front Panel Facilities
Hexagonal Wrench
Connection Diagram
Block Diagram
Circuit Description
Meter Amplifier
Power Amplifier Circuit
Protection Circuit
Relay Driver Circuit
Meter Amplifier Circuit
Frequency Response of the Peak Meter
Muting Operation
Operation by Detector Circuit Command
Overload Detector Circuit
Center Point Potential Detector Circuit
Center Point Potential Detector
Power Supply Circuit
Surge Current Countermeasures
Disassembly
Top Cover
Front Panel
Bottom Plate
Parts Location
Front Panel View
Front View with Panel Removed
Top View
Bottom View
Rear Panel View
Adjustments
Power Amplifier
DC Balance/Idle Current/Power Limiter Adjustment
Connection Diagram for Power Limiter Adjustment
The Position of VR1 and VR2
Connection Diagram for Meter Amplifier Adjustment
Exploded Views
Nomenclature of Screws, Washers and Nuts
External Part
Internal Part
Panel Stay Block
Center Chassis Block
Rear Panel Block
Power Amplifier Block
Schematic Diagrams, P. C. Board Patterns and Parts List
Schematic Diagram and Miscellaneous Parts
Schematic Diagram
External Appearance of Transistors and IC
Meter Amplifier Assembly
Parts List of Meter Amplifier Assembly (AWM-113)
Resistors
Capacitors
Semiconductors
List of Changed Parts for Factory Modification
Power Amplifier Assembly (AWH-065)
Parts List of Power Amplifier Assembly (AWH-065)
Resistors and Potentiometers
Fuse Assembly (AWR-143)
Parts List of Fuse Assembly (AWR-143)
Power Supply Assembly (AWR-139)
Parts List of Power Supply Assembly (AWR-139)
Foil Side (AWR-140)
Packing
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Model Spec 4 Comes in Two Versions Distinguished as Follows
2
Specifications
3
Connection Diagram
4
Power Amplifier Circuit
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