Troubleshooting, About Protective Circuits

TROUBLESHOOTING

If you experience trouble with the PM-15S1, make the below checks before thinking the worst. Improper operation can cause the PM-15S1 to behave in a way that makes you think something is wrong with the equipment when actually not. If the trouble cannot be fixed after making the below checks, contact the place of purchase, your nearest Marantz dealer, our customer service center or our repair service center.

* Power does not turn ON.

1. Is the power cable securely plugged into a power outlet?

* Nothing is heard from the speakers.

1.Aren’t the SPEAKERS buttons on the front panel in the OFF position?

2.Isn’t the attenuation feature (ATT.) active?

3.Isn’t there trouble in the input source selected from the INPUT SELECTOR knob on the front panel?

4.Are you using the player (replaying device) correctly?

5.Are connection cables and speaker cables securely connected?

6.Volume may have been muted by a protective circuit that tripped. Try adjusting the volume level again.

7.If an error message is displayed, correctly set the ID number as indicated in the table under “Error Messages”.

*Volume level differs between left and right channels.

The volume level setting may differ between the left and right channels. Try trimming the volume level again.

* Stereo sound is not heard from the speakers.

The operating mode switch on the rear panel may be set to “BI-AMP”. Shut power OFF, set the switch to “STEREO” and then reactive the power. Power must be activated after the operating mode switch is set for the setting to be active.

*Record player audio is not heard or contains a lot of noise.

1.Is the PHONO MC button on the front panel set to the type of cartridge you are using?

2.Are connection cables securely connected?

3.Is the grounding wire from the record player connected to the PHONO GND terminal?

4.Is the cartridge properly connected to the tone arm?

7About Protective Circuits

The PM-15S1 is equipped with protective circuits to protect the amplifier circuits and speaker system against damage. If a protective circuit trips, the sound is instantly muted. In this case, “PROTECT” flashes on the display panel.

•At Power ON

For about 8 seconds after power is activated, a protective circuit trips and mutes the sound to give amplifier circuits time to stabilize. Once the amplifier circuits stabilize, the protective circuit releases and audio is enabled.

•In the Event of Overcurrent

A protective circuit trips if current of a certain level is detected, which can happen if excessive signal flow is input to the amplifier or if the PM-15S1 is connected to a speaker system of less than 4 Ω impedance. A protective circuit can also trip if a speaker cable accidentally shorts. In these cases, “PROTECT” flashes on the display and, approximately 8 seconds later, the sound is automatically muted and the protective circuit is released. Therefore, readjust the volume level to resume normal use.

•If Strong Bass Signals Are Input

A protective circuit trips if bass signals of an excessive level are detected. In this case, “PROTECT” flashes on the display and, approximately 8 seconds later, the sound is automatically muted and the protective circuit is released. Readjust the volume level to resume normal use.

•If the Power Amplifier Overheats

A protective circuit trips if the temperature of the main amplifier rises above a certain level, which can happen if excessive signal flow is continually input into the amplifier. Temperature can also exceed the trip level of the protective circuits if the vents on the top of the PM-15S1 are covered or if the PM- 15S1 is installed on a cramped audio rack. In these cases, “PROTECT” flashes on the display and, when the temperature inside the unit lowers, the sound is automatically muted and the protective circuit is released. Readjust the volume level to resume normal use.

ENGLISH

PM-15S1 specifications

The Marantz PM-15S1 is a high-performance integrated amplifier that stands as a testament to Marantz’s commitment to audio excellence. Known for its sophisticated design and robust capabilities, this model has garnered acclaim among audiophiles and casual listeners alike.

One of the standout features of the PM-15S1 is its high current capability, which ensures that it can drive a wide range of speakers with ease. This amplifier is designed with a unique power supply that incorporates a massive toroidal transformer and high-quality filtering capacitors. This configuration provides steady and clean power, allowing for dynamic sound reproduction without distortion, making the PM-15S1 suitable for various musical genres.

The heart of the PM-15S1 lies in its advanced amplification technology. It employs a fully discrete current feedback circuit that has been meticulously crafted to deliver a natural and transparent sound. This circuit configuration minimizes signal degradation, allowing for precise audio playback that is faithful to the original recording. Additionally, the amplifier features a high-speed, high-current output stage that enhances its performance, particularly in reproducing intricate musical passages.

One significant characteristic of the PM-15S1 is its versatility. Equipped with multiple input options, including balanced XLR and unbalanced RCA connectors, users can easily integrate various audio sources. The amplifier also features a built-in phono stage, accommodating both moving magnet and moving coil cartridges, which is a boon for vinyl enthusiasts.

The construction of the PM-15S1 reflects Marantz’s dedication to quality. The amplifier is housed in a meticulously crafted chassis that reduces vibration and interference, ensuring that the audio signal remains pure. Its elegant design, complemented by luxurious finishes, makes it an attractive addition to any audio setup.

Another essential aspect of the PM-15S1 is its user-friendly interface. The front panel includes intuitive controls for volume, balance, and source selection, allowing for a straightforward user experience.

In conclusion, the Marantz PM-15S1 integrated amplifier is a remarkable piece of audio engineering that combines cutting-edge technologies with superior sound quality. Its robust features and sophisticated design make it a perfect choice for those who seek an enriching listening experience, whether it be for casual listening or critical sound reproduction.