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Instructions to reduce risk of fire, electric shock, or injury to persons.
Guidelines for connecting the unit to an appropriate power source.
Precautions regarding product placement and use with accessories.
Instructions for handling and maintaining the power cord.
Requirements for qualified service personnel and servicing conditions.
Notes on PCB layout, test points, and capacitor mounting.
Table listing replacement parts for PCB M1231.
Instructions for modifying the M1231B model for North America.
Chronological record of PCB design changes.
Diagrams showing pin assignments for various ICs and transistors.
Schematic details for the high-frequency limiter circuit.
Schematic details for the low-frequency limiter circuit.
Component placement diagram for the limiter PCB.
Diagram showing internal wiring for export models (CE 230V).
Identification of front panel controls, indicators, and knobs.