Marantz SM-1151 manual Troubleshooting, Protective Circuits

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TROUBLESHOOTING

If you experience trouble with the SM-11S1, make the below checks before thinking the worst. Improper operation can cause the SM-11S1 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?

2.Is the remote power control switch on the rear panel set correctly?

Nothing is heard from the speakers

1.Is the SPEAKERS button on the front panel OFF?

2.Is the input set correctly using the BALANCED button or UNBALANCED button on the front panel?

3.Is the gain switching mode in use causing sound to be muted?

4.Are connection cables and speaker cables securely connected?

5.A protective circuit may have tripped causing sound to be muted. If PROTECT is flashing in the display, switch the power off and wait for approximately 1 minute before switching the power on again.

Sound from the speakers is not stereo

The MODE switch on the rear panel may be set to BTL. If the switch is set to BTL, switch off the power, change the AMP MODE switch to STEREO, and then switch the unit’s power back on again.

7Protective Circuits

This unit 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 and the STANDBY indicator also flashes.

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 Over current

A protective circuit trips if current that exceeds the set level is detected, which can happen if excessive signal flow is input to the amplifier, or if the unit is connected to a speaker system of less than 4Ω impedance. A protective circuit can also trip if a speaker cable accidentally shorts. In these cases, “PROTECT” flashes on the display, and the STANDBY indicator flashes red. To release the protective circuits, switch the power OFF, and wait for approximately 1 minute before switching the power back ON again.

If Strong Bass Signals Are Input

A protective circuit trips if bass signals of an excessive level are detected.

In these cases, “PROTECT” flashes on the display, and the STANDBY indicator flashes red. To release the protective circuits, switch the power OFF, and wait for approximately 1 minute before switching the power back ON again.

If the Amplifier Overheats

A protective circuit trips if the temperature of the main amplifier rises above the set 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 unit are covered, or if the unit is installed on a cramped audio rack. In these cases, “PROTECT” flashes on the display, and the STANDBY indicator flashes red. To release the protective circuit, switch off the power supply and wait for the amplifier to cool to operational temperature before switching the power on again.

In the Event of Amplifier Trouble

A protective circuit trips and automatically shuts off the power if an abnormality is detected in the power circuit for whatever reason.The same happens if the main fuse inside the amplifier blows. In these cases, the STANDBY indicator on the display flashes red.

Switch off the power supply, and wait for a few minutes before switching the power on again. If the display does not light and the STANDBY indicator continues to flash after switching the power on again, the unit has a fault.

ENGLISH

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Contents Model SM-11S1 User Guide Risk of Electric Shock Do not Open Do not touch hot spots during and immediately after use Additional Safety InformationEnglish CE Marking Waarschuwingen Contents Features Copyright Before UsingEquipment Mains Working Setting Inappropriate Places for InstallationFront Panel Names and Functions of Parts2STANDBY Indicator Display1Display Panel Rear Panel Balanced Jacks ConnectionsWiring with Y style terminal Wiring Speaker CableCD Player To Line OUT jackSM-11S1 CD Player ¶ Bi-Wiring ConnectionSM-11S1 for R ch SM-11S1 for L chConnection Example 4 Stereo Complete Bi-amp Connection ¶ About Complete Bi-AmpCh for SC-11S1 CD Player SM-11S1 for Front L/R For front L/RSuper Audio CD Multi-channel Player etc For center/ subwooferSM-11S1 for Center SM-11S1 for surround L/R For surround L/RConnecting the Power Supply Speaker Positioning for Super Audio MULTI-CHANNEL Sound¶ ITU International Telecommunication Union ¶ How to Set Meter Mode HOW to USE and SET FeaturesHOW to USE the Meter Mode Button Digital Power Meter Balanced INPUT/UNBALANCED Input Gain SettingsDisplay button AMP ModeHOW to Operate the Side Illumination Illumination LampSet to on Remote Power ControlProtective Circuits Troubleshooting¶ Dimensions unit mm inch Specifications & Dimensional DrawingsCleaning of equipment external surfaces OthersRepairs Page 09/2007 00M23AJ851310 mzh-g