Marantz 15
Manuals and User Guides for Marantz 15. We found 1 manuals for free downloads Service manual
Below you will find brief information for Model 14, Model 15 Solid State Amplifiers. This document serves as a comprehensive guide for servicing these Marantz amplifiers, detailing their circuit description, technical specifications, and necessary test equipment. It outlines procedures for critical adjustments like D-C balance and bias, along with extensive troubleshooting tips for common field issues, ensuring optimal performance and reliable operation of the solid-state amplifier.
Key Features
70 watts RMS output at 4 ohms load (per channel)
Frequency response within 1 dB, 10 to 60 KHz
Total Harmonic Distortion less than 0.1% (typically 0.03%)
Damping Factor greater than 150 with 8-ohm load
Instantaneous overload recovery
Two full-wave power supplies (separate B+ and B-)
Complementary-symmetry configuration
Direct-coupled design (except input network)
Slow turn-on characteristic for system stabilization
Overload indicator lamps (DS101, DS102)
Frequently Answers and Questions
How do I convert the Marantz amplifier from 120 Volt to 240 Volt operation?
To convert, you need to install a threaded insulated terminal, secure it with a screw, connect the black/white and black/green transformer leads together at this terminal, and then change the fuse to a 1-1/2A, AGC or 3AG type.
What is the rated power output of the amplifier at different load impedances?
The amplifier delivers 70 watts RMS at 4 ohms, 60 watts RMS at 8 ohms, and 40 watts RMS at 16 ohms per channel, across the frequency range of 20 Hz to 20,000 Hz.
What is the procedure for adjusting the D-C balance of the amplifier?
To adjust D-C balance, connect a shorting plug to the INPUT, set a VTVM for zero center, and connect its leads to the loudspeaker terminals. With 120V line power applied, adjust potentiometer R19 (located under the access cover screw) until the VTVM indicates a zero center scale.
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