Troubleshooting, Resetting the Amplifier

TROUBLESHOOTING

If you believe something is wrong with your ampliﬁ er, check the following points. Unintentional errors in operation or mistakes made in the connections are sometimes misinterpreted as failure.

If the failure persists even after checking the below points, contact your dealer, your nearest Marantz Consumer Marketing ofﬁ ce or customer center, or a Marantz service center.

Symptom	Cause	Remedy		Related
Symptom	Cause	Remedy		page
				page

The amplifier's power fails to	The power plug is not connected.	Insert the power plug into the wall		7
come on.		outlet.		7
come on.		outlet.

No sound can be heard from the	The connecting cables (input) or speaker	Check the cable connections.		5, 6
speakers.	cables have been incorrectly connected.			5, 6
speakers.	cables have been incorrectly connected.

	The setting of one or more of the input	Set the input switch to the position that
	selector switches does not correspond	corresponds to the input connected to
	to the input connector (BALANCED or	the ampliﬁer.		4
	UNBALANCED) to which the cable has
	been connected.

The power suddenly goes	The temperature inside the ampliﬁer has	• Turn off the power, and wait until
off, and the standby indicator	risen, tripping the protection circuit.	the amplifier's temperature	has
blinks slowly (about two times		fallen to a low enough level before
a second).		turning the power back on.		2
		• Check whether the ampliﬁ er has		2
		• Check whether the ampliﬁ er has
		been installed in a position that
		interferes with the dissipation of its
		heat.

	The protection circuit has been tripped	• Turn the power off, and check the
	because two conductors ("+" and "-") of	speaker cable connections.
	a speaker cable are touching each other	• Re-process the ends of	the	6
	or because the conductors have made	conductors of the speaker cables.
	contact with the rear panel or another	conductors of the speaker cables.
	contact with the rear panel or another
	metal part.

	Sound is being played at a volume higher	Turn the power off, turn down the
	than the performance of the ampliﬁer can	volume control on the control ampliﬁer		–
	deliver.	connected to this ampliﬁer, then turn		–
	deliver.	connected to this ampliﬁer, then turn
		the power back on.

	Speakers with an impedance below the	Use speakers with the specified		6
	speciﬁed rating (6 Ω) are being used.	impedance.		6
	speciﬁed rating (6 Ω) are being used.	impedance.

The power suddenly goes off,	The amplifier's protection circuit has	Disconnect the power plug from the
and the standby indicator blinks	been tripped.	power outlet, and ask your nearest		14
rapidly (about eight times a		service center to repair the ampliﬁer.		14
rapidly (about eight times a		service center to repair the ampliﬁer.
second).

ENGLISH

RESETTING THE AMPLIFIER

This ampliﬁ er features a microcontroller.

The microcontroller can be reset by following the steps below.

IN OUT IN

ONTROL REMOTE CONTROL

1. Set the ampliﬁ er to standby or turn its power on.

2. Use the tip of a needle or other sharp-pointed object to press the reset switch in the hole indicated by the arrow for at least 1 second.

3. When the ampliﬁ er power is already on, the ampliﬁ er is ﬁ rst set to standby mode, after which the microcontroller is initialized, and the power is turned back on.

When the microcontroller is reset with the ampliﬁ er in standby mode, it is initialized, then the power is turned back on.

NAMES AND	FUNCTION
BASIC	CONNECTIONS
OPERATION
ADVANCED	CONNECTIONS
TROUBLESHOOTING
OTHERS

MM8003 specifications

The Marantz MM8003 is a high-performance power amplifier designed to deliver an exceptional audio experience for home theater and audio enthusiasts alike. Known for its robust build quality and advanced features, the MM8003 stands out as an impressive addition to any audio setup.

One of the standout characteristics of the MM8003 is its ability to drive multiple channels with ease. The amplifier offers a multi-channel configuration, allowing it to power up to eight channels simultaneously. This makes it an ideal choice for creating a comprehensive home theater system that can handle immersive audio formats like Dolby Atmos and DTS:X, enhancing the overall cinematic experience.

The amplifier is built on Marantz's rich heritage in audio engineering, featuring a high-current design and quality components that ensure reliable performance. The MM8003 utilizes a sophisticated Class AB amplification topology, which combines the best of both Class A and Class B designs. This results in a rich, warm sound with minimal distortion, making it perfect for both music and movie playback.

The MM8003 boasts an impressive power output, delivering up to 150 watts per channel into 8 ohms. For users seeking even greater power, the amplifier can operate efficiently at 4 ohms, providing 200 watts per channel. This level of power makes it suitable for driving a wide range of loudspeakers, from bookshelf models to larger floor-standing units, ensuring dynamic and impactful sound reproduction.

Connectivity is another vital aspect of the MM8003. The amplifier includes a range of input options, allowing users to easily integrate it into their existing audio setups. With XLR balanced inputs and RCA inputs available, users can connect their source components with minimal noise interference. Additionally, the MM8003 is equipped with removable power cords, making it flexible and convenient for various home configurations.

Moreover, the Marantz MM8003 features advanced thermal management systems, ensuring that the amplifier remains cool even during prolonged use. This reliability and efficiency contribute to its durability and longevity, making it a worthy investment for audio enthusiasts seeking high-quality sound.

In summary, the Marantz MM8003 power amplifier is a robust, versatile audio solution that excels in multi-channel performance and sound quality. With its advanced amplification technology, powerful output, comprehensive connectivity, and efficient design, it is an ideal choice for those looking to elevate their home audio experience to new heights.