Marantz PM-14S1 HDAM & Current feedback Amp of Marantz Unique technolo - Page 28

ENGLISH Appendix Explanation terms About the protection circuit MM/MC cartridge select There are two types--MM (Moving Magnet) and MC (Moving Coil)--of cartridges for turntable. As the output levels for these two types of cartridges differ, the setting of the phono equalizer that is mounted in this unit must be switched according to the type of cartridge for your turntable. For switching, use the PHONO MC button on this unit. Speaker impedance This is an AC resistance value, indicated in Ω (Ohms). Greater power can be obtained when this value is smaller. Protection circuit This is a function to prevent damage to devices within the power supply when an abnormality such as an overload, excess voltage occurs or over temperature for any reason. If a malfunction occurs in this unit, the power indicator blinks red and the unit switches to standby mode. This unit is equipped with a protection circuit to protect the amplifier circuits and speaker system from damage. If the protection circuit is activated, the sound is instantly muted. In this case, the message "PROTECT" flashes on the display panel, and the STANDBY indicator also flashes. To deactivate the protection circuit, turn the unit off then back on again after about 1 minute or more. At power on For about 8 seconds after the power is turned on, the protection circuit is activated, muting the sound to give the amplifier circuits time to stabilize. Once the amplifier circuits stabilize, the protection circuit is released, and audio is enabled. In the event of overcurrent The protection circuit is activated if current exceeding a certain 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 4 Ω/ohms impedance. The protection circuit is also activated if a speaker cable shorts. In such cases, the message "PROTECT" flashes on the display, and the volume is automatically reduced. After approximately 8 seconds, the protection circuit is released. Therefore, the volume needs readjusting to continue normal use. If the overcurrent continues, the amplifier shuts itself OFF, and the STANDBY indicator flashes. To deactivate the protection circuit, turn the unit off then back on again after about 1 minute or more. If the main-amplifier overheats The protection circuit is activated if the temperature of the main amplifier section rises above a certain level, which can happen if the amplifier is continuously used with excessive signal flow being input to it. The protection circuit is also activated when the specified operating temperature is exceeded, which can happen if the vents on top of the amplifier are covered or if the amplifier is installed on a cramped audio rack. In such a case, the STANDBY indicator flashes, and the volume is automatically reduced. After approximately 8 seconds, the protection circuit is released. Therefore, the volume needs readjusting to continue normal use. If the temperature does not sufficiently fall within a certain amount of time after the protection circuit activation, the amplifier shuts itself OFF, and the STANDBY indicator flashes. To deactivate the protection circuit, turn the unit off, let it stand until it cools down, then turn it ON again. In the event of amplifier trouble The protection circuit is activated, and the power is automatically shut OFF, if an abnormality is detected in the power circuit. The same happens if the main fuse inside the amplifier blows. In such cases, the STANDBY indicator flashes. Turn the unit off then after several minutes turn it on again. If the display does not light up, and the STANDBY indicator remains flashing after the unit is turned on again, the unit may be in failure. If excessive ultrabass signals are input The protection circuit is also activated if ultrabass signals are input. In such a case, the STANDBY indicator flashes, and the volume is automatically reduced. After approximately 8 seconds, the protection circuit is released. Therefore, the volume needs readjusting to continue normal use. If excessive ultrabass signal input continues or if DC voltage is detected owing to trouble with the amplifier, the amplifier shuts itself OFF, and the STANDBY indicator flashes. To deactivate the protection circuit, turn the unit off then back on again after about 1 minute or more. 24