McIntosh MA6900

SERVICE MANUAL
Performance Specifications ........................................ 2
Notes ......................................................................... 2
Rear Panel .................................................................. 3
Section Location ........................................................ 4
Block Diagram ...................................................... 5 - 6
Interconnection Diagram ...................................... 7 - 8
Main Schematic and PCB.................................... 9 - 18
Balanced Schematic and PCB.............................. 12, 18
Heatsink Schematic and PCB ............................. 19 - 20
Capacitor Schematic and PCB ........................... 21 - 22
Control Schematic and PCB .............................. 23 - 26
Lamp Schematic and PCB ................................. 25 - 26
Tone Schematic and PCB .................................. 27 - 31
Keyboard Schematic and PCB ........................... 30 - 32
Parts List ............................................................ 33 - 36
Exploded Views and Parts Lists .......................... 37 - 40
Repacking Instruction .............................................. 41
CONTENTS
INTEGRATED AMPLIFIER

McIntosh MA6900 Specifications

General

Brand	McIntosh
Model	MA6900
Category	Amplifier
Language	English

Summary

McIntosh MA6900 Performance Specifications

Key Performance Metrics

Details amplifier's power output, frequency response, sensitivity, and distortion levels.

Service Notes and Warnings

Guidelines for interpreting schematics, component values, and safety precautions.

McIntosh MA6900 Section Locations

Top View Component Layout

Diagram showing component locations on the top side of the amplifier with cover removed.

Bottom View Component Layout

Diagram showing component locations on the bottom side of the amplifier with cover removed.

Control and Lamp PCB Diagrams

Control PCB Schematic

Schematic for the amplifier's control and user interface circuitry.

Lamp PCB Schematic

Schematic diagram for the indicator lamps and their driving circuitry.

Exploded View - Main Assembly

Chassis and Internal Components

Exploded view of the amplifier's main chassis, internal boards, and structural components.

Exploded View - External Parts

Front Panel and Chassis Components

Exploded view of front panel controls, chassis, and external hardware.

Exploded Parts List

Detailed list of parts shown in the exploded views, with item numbers.

Repacking Instructions

Shipping and Packaging Procedures

Detailed steps and required materials for safely repacking the unit for shipment.