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Information on how to order Marantz parts, including contact details and required information.
Lists overseas addresses for ordering Marantz parts in Canada, Australia, Japan, and Europe.
This service manual provides information for Marantz PM250/PM400 Stereo Console Amplifier for experienced personnel.
Describes signal flow from input terminals through the selector switch to the tone amplifier.
Lists common troubleshooting issues like excessive line consumption, zero bias voltage, and high hum/noise.
Details the adjustment procedure for idling current in the power amplifier.
Explains how to adjust the power meter to register correct wattage output.
Lists essential test equipment and their manufacturers/models for servicing the Marantz amplifier.
Outlines the steps and procedures for verifying the performance of the Marantz amplifier.
Refers to Table 1 for the required test equipment for performance verification.
Details preliminary setup steps, including connecting the amplifier to test equipment and setting controls.
Procedure to measure total hum and noise levels in the amplifier using a distortion analyzer.
Steps to measure the maximum power output of the amplifier using an audio oscillator and analyzer.
Detailed procedure for measuring harmonic distortion at various frequencies using an audio oscillator and analyzer.
Instructions on how to change the unit's power source voltage using the selector.
Provides the schematic diagrams for both the PM250 and PM400 models.
Schematic and component layout for the LED Power Meter assembly.
Schematic and component layout for the Main Assembly.
Schematic and component layout for the LED Lamp assembly.
Schematic and component layout for the Loudness Assembly.
Schematic and component layout for the Microphone Amplifier assembly.
Schematic and component layout for the Tone Assembly.
Schematic and component layout for the Volume Assembly.
Exploded view and parts list for the front panel assembly of the PM400 and PM250 models.
Exploded view and parts list for the top cover assembly.
Exploded view and parts list for the rear panel assembly, including jacks and selectors.
Exploded view and parts list for chassis and general components.
Exploded view and parts list for the main P.W. Board and general parts specific to the PM250.
Exploded view and parts list for the main P.W. Board and general parts specific to the PM400.
Lists all packing materials included with the unit for shipping and protection.
Detailed list of electrical components for the main circuit board (PM400 and PM250).
List of capacitors used in the main circuit board, including values and ratings.
List of resistors used in the main circuit board, including values and tolerance.
List of semiconductor components (transistors, diodes, zeners) for the main circuit board.
List of miscellaneous components like terminals, jacks, switches, and chokes for the main board.
List of capacitors used in the Tone Amplifier circuit board.
List of resistors used in the Tone Amplifier circuit board.
List of semiconductor components for the PX00 LED circuit board.
Details the Volume Control circuit board and its components.
List of capacitors used in the Volume Control circuit board.
List of resistors used in the Volume Control circuit board.
Details the Mic Amplifier circuit board and its components.
List of capacitors used in the Mic Amplifier circuit board.
List of resistors used in the Mic Amplifier circuit board.
Details the LED circuit board and its components.
List of resistors used in the PX00 LED circuit board.
List of semiconductor components for the PX00 LED circuit board.
Details the Pilot Lamp circuit board and its components.
Details the Loudness circuit board and its components.
List of switches used on the Loudness circuit board.
Technical specifications for the audio output, distortion, and frequency response.
General specifications including power requirements, dimensions, and weight.
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General