Need help?Do you have a question about the Marantz PROFESSIONAL Series and is the answer not in the manual?
Important safety warnings and operating precautions for servicing the amplifier.
List of recommended test equipment for servicing the amplifier.
Steps for setting up tests and unit controls before verification.
Procedure to adjust output offset voltage to zero for both channels.
Procedure to check bias current by monitoring wattmeter.
Procedure to adjust bias using a voltmeter across specific resistors.
Procedure to test amplifier's maximum power output at specified frequencies.
Procedure to measure total harmonic distortion at various frequencies and loads.
Procedure to measure input vs. output signal levels for gain verification.
Procedure to compare output voltage between channels for gain matching.
Procedure to calibrate the VU meters using specific voltage and range settings.
Procedure to measure isolation between audio channels at high frequencies.
Procedure to measure hum and noise levels at the speaker terminals.
Procedure to verify square wave response for distortion-free performance.
Likely causes for no power consumption in the amplifier.
Likely causes for incorrect bias settings in the amplifier.
Likely causes for high power draw from the amplifier.
Likely causes for DC offset issues or imbalance in the amplifier.
Likely causes for unwanted oscillations in the amplifier.
Likely causes for hum and noise issues in the amplifier.
Likely causes for signal clipping issues in the amplifier.
Likely causes for soft start circuit failure in the amplifier.
Likely causes for lack of audio output from the amplifier.
Likely causes for distortion on specific loads in the amplifier.
Instructions for removing the top cover and safety precautions.
Maintenance instructions for the air filter.
Instructions for removing the heatsink assembly.
Instructions for removing the side panel and left heatsink module.
Procedure for testing the amplifier board independently.
Information on testing output devices and using test points.
Steps for converting the unit for different voltage operation.
Recommendation for installing speaker line fuses for protection.
Instructions and precautions for safely packing the unit for shipping.
To Next Page
General
