Marantz MM7025, 5411 10586 001M manual Explanation of terms, Protection circuit, Speaker impedance

Page 14

ENGLISH

 

Explanation of terms

Troubleshooting

P

Protection circuit

This is a function to prevent damage to components within the power supply when an abnormality such as an overload or excess voltage occurs for any reason.

In this unit, the STANDBY indicator and protection indicator blinks and the unit enters standby mode when an abnormality occurs.

S

Speaker impedance

This is certain-rated resistance of the speaker set to an alternating current and expressed in ohms.

The smaller the impedance, the greater the output.

However, load on the amplifier is increased. Use speakers whose impedance is supported by this unit.

If a problem should arise, first check the following:

1.Are the connections correct?

2.Is the set being operated as described in the user guide?

3.Are the other components operating properly?

If this unit does not operate properly, check the items listed in the table below. Should the problem persist, there may be a malfunction. In this case, disconnect the power immediately and contact your store of purchase.

Symptom

Cause/Solution

Page

 

 

 

The power does not switch on.

• Check that the power plug is inserted correctly in the wall socket.

7

Or, the power switches off immediately after

• The protective circuit has operated. In this case, remove the power plug

7, 10

being switched on.

from the wall socket, and wait for at least 1 minute before inserting it in the

 

 

wall socket again.

 

There is no sound from the speakers.

• Check the speaker connections and connections to the other devices.

6

 

• Alter the input selector to match the input connector (BALANCED or

4

 

UNBALANCED) of the connected device.

 

The power suddenly switches off during use,

• The internal temperature of the unit has increased, causing the protective

and the STANDBY indicator and protection

circuit to operate. Remove the power plug from the wall socket, wait until

 

indicator flash at approximately 0.5 second

the temperature of the unit has dropped adequately, and then insert the

 

intervals.

power plug back into the wall socket.

 

 

• Install this unit in a well-ventilated location.

 

• Use speakers that have the specified impedance.

4

 

• If the two core wires of the speaker cables are touching, or if a core wire

4, 10

 

is out of the terminal causing the core wire to touch the rear panel of this

 

 

unit, the protective circuit will operate. Remove the power plug from the

 

 

wall socket, and firmly re-insert the core wire, or fix the terminal before

 

 

reconnecting it.

 

• Turn the volume down on the amp connected to this unit, and insert the

 

 

power plug again.

 

When the power switches off suddenly

• The protective circuit has operated. In this case, remove the power plug

6, 7, 10

during use, the STANDBY indicator flash

from the wall socket, re-examine the installation conditions of this unit, and

 

at approximately 0.1 second intervals and

check the speaker cable connections. If the same situation occurs when the

 

protection indicator flash at approximately 0.5

power is switched on again, contact the Marantz Service Center.

 

second intervals.

 

 

10

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Contents MM7055 Page NSAFETY Precautions For Canadian customersAvertissements Advertencias About this manual AccessoriesGetting started Features RSpeaker terminals Part namesFront panel Rear panel TFlasher input terminalsSpeaker connections ConnectionsPreparations Audio cables1ch surround playback ZONE2 playback Front speaker upgradeExample connection variation 2ch playbackConnecting MM7055 with an AV pre-tuner AV7005 Connecting the power cord Remote control connectionEDC control input connector QFlasher input connector FlasherWDC control output connector RRemote control connectorTurning the power standby Turning the power onSwitching the illumination lamp OperationsSpeaker impedance Explanation of termsProtection circuit MM7055 SpecificationsIndex MM7025Page Dimensions / Dimensions / Dimensioni MM7055